Microcomputer Protection Relays and Monitoring Device for Line Protection

Zhuhai Wanlida Electric Co., Ltd. http://www.zhwld.com

User’s manual of MLPR-610Hb microcomputer

protection and monitoring device for line

Prepared by：

Proofed by：

Approved by：

Document No.: WLD [K]-JY-222-2010 Version No.: V2.03.01

Date of publication: Oct. ，2010

Copyright: Zhuhai Wanlida Electric Co., Ltd.

Note: Our company reserves the right to modify this manual. For any inconsistency

between the product and this manual, please contact us for relevant services.

Technical support hotline: 0756-3395398 Fax: 0756-3395500

Foreword

1

F o r e w o r d

1. Model description

The structural type of the MXPR-600Hb series protection is Hb. MLPR-610Hb

supports A, B, C three-phase current protection, also supports A, C two-phase

current protection. When ordering, please specify.

2. Standards referenced

General specification for static protection, security and automatic equipment, DL

478-2001

Technical code for relaying protection and security automatic equipment

GB/T 14285-2006

Protective relay and automatic equipment design rules of power eequipment

GB50062-92

3. Caution

Negative sequence voltage involved in this series of protection is combined with

phase voltage, all of low voltage component depend on line voltage in compound

voltage block, if one of the three line voltages is lower than low voltage setting, low

voltage component will operates and unblock over current protection.

There are 4 standard curves of inverse protection involved in this series of protection,

if the fault current is higher than 15 times of rated current, the inverse protection

component as if the current is 15 times of rated current.

The appearance should be inspected before power is applied, to ensure that the

panel is OK without scratch, the screws are tightened, the device is grounded firmly,

all screws of plug-ins are tightened and in good contact.

When power is applied, the ―Run‖ indicator on the panel should flash, digital tube

displays primary measuring result in cycle, protection and measuring data are

displayed on the lcd in cycle.

The terminal D25～D28 are measuring circuit of 4～20mA DC signal, when

2

testing(Can be selected or not)

signal should be supplied by special equipment, direct apply signal of relay protection

tester is prohibited.

When the device is equipped with ungrounded system, terminal D07，D08 are zero

sequence small current input terminal, the ac current input should be limited to within

2A, the measuring current input should be limited to 6A, pay attention to the signal

input when testing to avoid large signal applied so as to avoid damage to

components.

Operating circuit inside the device is only applicable to DC power supply, if AC power

is used, it should be applied with rectifier and filter.

It is prohibited to plug or unplug the plug-ins, in order to avoid damage to the device.

It is prohibited to do digital output test when the device is running with primary

equipments.

Foreword

3

1. Product description

1.1 Scope of application

The MLPR-600Hb microcomputer line protection and monitoring device applies to the

line protection and monitoring in ungrounded systems or systems grounded via resistor

with voltage ratings of below 66kV. It can also be used as a current voltage protection and

monitoring device in 110kV grounded systems.

1.2 Function and specification

1.2.1 Protective function

3-step compounded voltage block directional overcurrent protection（Three-step OC）

Inverse time overcurrent protection（IT Overcurrent）

3-phase zero sequence voltage block zero sequence overcurrent directional

protection （ZS Overcurrent）

Zero sequence overvoltage protection（ZS Overvoltage）

Overload protection（Overload）

Under frequency unloading protection（Under-frequency）

Auto reclosing

Later Instantaneous Trip（Later Inst.Trip）

PT failure

Under voltage protection（Undervoltage）

Bus charging protection

Non-electric quantity protection（2-way）（Non-electric）(Can be selected or not)

Synchronous Closing（Sync. Closing）

1.2.2 Auxiliary function

Harmonic spectrum analysis

Phase display

Low current line selection

Fault recorder

Integral energy and pulse energy(Pulse energy can be selected or not)

Self-checking fault alarm of device

Remote calling and modification of protection’s settings

Fault recorder

One or two ways programmable output of 4～20mA

Provide ethernet print function(manual print setting value, manual/auto print reports)

(Can be selected or not).

1.2.3 Monitoring function

User’s manual for MLPR-610Hb microcomputer protection and monitoring device for line WLD[K]-JY-222-2010

4

Electric quantity（remote measuring quantity）：voltage, current, active power, reactive

power, active energy, reactive energy, power factor, grid frequency, non-electric

quantity measuring(Can be selected or not), etc.

Remote binary quantity: the device has 15-way binary input, in which: 12-way for

external gathering, and 3-way for internal gathering.

1.2.4 Communication capability

2 standard RS485 multipoint communication ports

2 industrial ethernet ports (Can be selected or not)

Supports single, dual network communication, it is fully qualified for network

redundancy and backup

IEC-60870-5-103（RS485 communication mode）、 IEC-60870-5-104（ industrial

ethernet mode） standard communication protocol(Can be selected or not)

1.2.5 GPS clock synchronization function(Can be selected or not)

The device is able to receive GPS clock minute synchronization (or second

synchronization) through RS485 differentiate voltage, and it can be done with

monitoring system to accomplish GPS precise clock synchronization.

1.2.6 Device specifications

32-bit DSP microprocessor

Real-time multi-task operating system and C++ program techniques, realizing online

programming

Double-screen display (LCD Chinese display and nixie tube display), easy for

inspection

One or two ways 4~20mA DC quantity output, which can be set flexibly as any

corresponding electric quantity (such as current, voltage, power, frequency, etc.)

Collecting 4 ways of 4~20mA DC quantities for measurement of non-electric

quantities, such as temperature, pressure, and realizing online monitoring(Can be

selected or not)

Having the electric energy quality analysis function and perfect harmonic analysis

function

Integrating perfect metering functions

Excellent hardware interchangeability, easy user maintenance and reduced quantity

of spare parts

Protection output relays can be configured flexibly for user convenience

With remote/local changeover switch and trip/closing buttons, reducing the number of

elements on the board/cabinet panel and simplifying wiring

Using a 6U, 19/3‖ standard enclosure in a rear plug-in structure; the device can be

installed in site on a switchboard or combined in a centralized manner

1.2.7 Main technical specifications

Rated data

Power supply: DC/AC 86~265V

Operating voltage: DC 220V or DC 110V


5

AC voltage: 100/ 3 V or 100V

AC current: 5A or 1A

Frequency: 50Hz

Power consumption

DC circuit: <10W (normal operation); <15W (protection operation)

AC voltage circuit: <0.5VA/phase

AC current circuit: <1VA/phase (In = 5A); <0.5VA/phase (In = 1A).

Overload capability

AC voltage circuit: 1.2Un, continuous operation

Current measuring circuit: 1.2 In, continuous operation

Protective current circuit: 2In, continuous operation

10In, allowing 10s

40In, allowing 1s

Range and error of setting value

Maximum range of setting value:

Voltage element: 1V~120V

Current element: 0.1In~20In

Frequency: 45.00Hz~55.00Hz

Timing element: 0.00s~100.00s

Error of setting value:

Current and voltage setting value: ≤±3% of setting value

Frequency setting value: ≤±0.02Hz

Slip setting value: ≤±5% of setting value

Angle setting value: ≤±2°

Whole-group operation time (including relay’s intrinsic time):

Intrinsic operating time of current instantaneous overcurrent protection:

not greater than 40ms at 1.5 times the setting value

Intrinsic operating time of Difference instantaneous overcurrent

protection: not greater than 30ms at 2 times the setting value

Measuring accuracy

AC current: Class 0.2

AC voltage: Class 0.2

4~20mA DC quantity input: ≤±1%

Power: Class 0.5

Integral energy: Class 1 (active), Class 2 (reactive)

Frequency: ≤±0.02Hz

SOE resolution: ≤2ms

Pulse width of pulse quantity: ≥10ms

4~20mA DC quantity output: ≤±1%

Capacity of trip/closing output contact


6

Can be connected to DC 250V, 8A for prolonged periods.

GSP clock synchronization error

clock synchronization error≤2ms

Environmental conditions

Ambient temperature:

Operating：-20℃～+55℃。

Storage：-25℃～+70℃, rainproof and snow-proof rooms with relative humidity not

greater than 80%, ambient air free of acid, alkaline or other corrosive and explosive gas;

no excitation quality is applied at the limits, the device shall not have any irreversible

change; after temperature restoration, the device shall operate properly.

Relative humidity: The average relative humidity of the most humid month shall not

be greater than 90%, the average minimum temperature of this month not lower than 25℃

and there shall be no surface condensation; at the highest temperature of +40℃, the

average maximum humidity shall not exceed 50%. Atmospheric pressure: 80kPa~110kPa (below relative altitude of 2wc)

1.2.8 Hardware structure

The device uses a 6U, 19/3‖ standard enclosure, with aluminum alloy casing and installed by overall embedding. The display panel is mounted in the front, and the other plug-in modules are rear mounted. From the rear view, the power, I/O, CPU and AC plug-in modules are from the left to the right.

External dimensions and boring diagram

Structural and dimensional diagram Boring diagram for installation

Devices fabricated on-screen steps: first release on-screen stents unfastening screws,


7

Compounded voltage lock

≥

&

&

&

&

On/Off

TglTrip

output

Ia>Igl

Direction judgement

Direction judgement

Direction judgement

Direction judgment On/Off

Ib>Igl

Ic>Igl

Protection On/OFF

remove the stents; installed the device on the screen from the front and push until close to

the fixed plate; install the stent 2, and then stent 1, and then use fastening screw to

insertion hole from rear of stent1, and then screwed into stent 2 and tighten screw; the

stents from up and down are installed in the same way; use grounding screws to connect

grounding line.

2. Function of device

2.1 3-step compound voltage block directional overcurrent protection

（Three-step OC）

Each step can be set that it is blocked by compound voltage（the negative sequence

voltage is synthesized from the phase voltages, and minimum line voltage is used for

undervoltage block）and direction. The operation logic diagram of the compound voltage

block directional overcurrent protection is shown in Figure 2-1. When the ―Overcurrent

negative direction‖ is switched on, the operation zone of overcurrent step III is opposite

to that only when overcurrent step III direction is switched on.


8

U

I45

º

90º

10º

10º

160º

Figure 2-1 Operation logic of compound voltage block directional overcurrent

The inter-phase directional component uses 90°wiring mode and it is started by

phase.The current component of any phase can only be controlled by directional

component which are in the Table 2-1.

Table 2-1

Inter-phase directional

component

Iφ Uφφ

A Ia Ubc

B Ib Uca

C Ic Uab

Arg(Uφφ/Iφ)=-125°～35°,the boundary value is not very exact and the error is less

than ±2°.

Figure 2-2 Operation zone of inter-phase directional component

2.2 Inverse time limit overcurrent protection(IT Overcurrent )

In the heat accumulation mode, the time limit of the protection output shall not be less

than 40ms, and the inverse time limit characteristic can be:

a．Standard inverse time limit; curve equation: t = 0.14τ/[(I/Ip)0.02

-1]

b．Unusual inverse time limit; curve equation: t = 13.5τ/[(I/Ip) -1]

c．Extreme inverse time limit; curve equation: t = 80τ/[(I/Ip)2 -1]

d．Long inverse time limit; curve equation: t = 120τ/[(I/Ip) -1]

Where: I is the fault current, Ip is the setting value of the inverse time limit starting

current, τ is the time constant (0.01-1.00s).

The operation logic diagram of the Inverse time limit overcurrent protection is shown

in Figure 2-3.

Figure 2-3 Operation logic of inverse time limit overcurrent

2.3 3-step directional Zero sequence overcurrent protection(ZS Overcurrent)

IT overcurrent On/Off

Output sequence


9

In major grounding systems, the ground current is relatively high, the zero sequence

overcurrent protection of Step I, II trips directly, and that of Step III can be set as alarm or

trip for ungrounded systems. All the 3 steps of the zero sequence overcurrent protection

can be set to block in the direction of the zero sequence voltage. For ungrounded systems,

the zero sequence current is directly collected from the low current signal of the special zero

sequence CT.

The zero sequence Step III can switch on either alarm or trip. When both are

switched on, the trip function is enabled, the alarm function is released automatically.

For ungrounded systems, when a ground fault occurs in the system, the zero

sequence current of the ground fault point is basically a capacitive current with small

amplitude. If a zero sequence overcurrent relay is used to protect it from ground faults, its

selectivity can hardly be guaranteed. The device uploads the amplitude and direction of

the zero sequence current by communication, and the upper computer performs low

current ground wire selection.

The directional zero sequence overcurrent operation logic is shown in Figure 2-4.

Figure 2-4 Operation logic of directional zero sequence overcurrent

Zero sequence directional components set the operation zone separately for

grounding directly(grounding via low resistance),grounding via medium resistance(or

grounding via extinguishing coil), ungrounding（grounding via high resistance）.The zero

sequence voltage which is related to direction judgment uses zero sequence voltage

calculation for direction judgment when PT wiring is YY or there is no PT failure (PT

failure function should be switched on).To use the external open-delta voltage for

direction judgment when PT wiring is VV or there is a PT failure (PT failure function

should be switched on).

Grounding directly： Arg(3U0/3I0)= -30 º～-190 º

Grounding via medium resistance： Arg(3U0/3I0)= 100 º～260 º

Ungrounding： Arg(3U0/3I0)= 10º～170 º

2.4 Zero sequence Overvoltage protection(ZS Overvoltage)

A one-step definite time limit zero sequence overvoltage protection is provided, which

can be set as trip or alarm. When the trip function is switched on, the alarm function is

released automatically. The zero sequence overvoltage operation logic is shown in Figure

Trip output/alarm output

I0>I0gl

Zero-sequence over-current direction judgment

Zero-sequence over-current direction judgment On/Off

&

Zero-sequence over-current

protection On/Off TU0>U0bsZero-sequence voltage lock On/Off


10

2-5.

Figure 2-5 Operation logic of zero sequence overvoltage

2.5 Overload protection

A one-step definite time limit overload protection is provided, which can be set as trip

or alarm. When the trip function is switched on, the alarm function is released

automatically. The overload operation logic is shown in Figure 2-6.

Figure 2-6 Overload operation logic

2.6 Under-frequency unloading protection(Under-frequency)

The frequency is derived from software calculation, calculate frequency using voltage

UAB. The unloading protection is blocked by undervoltage block, under-current block or

slip block, in which slip block can be switched On/Off. The operation logic of

under-frequency unloading is shown in Figure 2-7.

Figure 2-7 Operation logic of under-frequency unloading

2.7 3-phase primary reclosing

The reclosing delay can be set, the whole operation process is completed in a single

charge（15s）;

There are 2 starting modes for reclosing: non-corresponding start and protection start

(overcurrent protection and zero sequence overcurrent protection); the software has

On/Off control words;

Condition of reclosing block: manual trip, remote controlled trip, external input block,

etc.

After closing the reclosing output for 600ms, the reclosing control signal will return.

Reclosing operation logic is shown in Figure 2-8. Reclosing synchronization check

doesn’t judge the frequency difference when PT is failure.

Trip/alarm output&Tgdy

Zero sequence

over-voltage On/off

U0>Ugdy

Circuit breaker at

closed position

Low-frequency unloading

On/Off Low-frequency

unloading protection

output sequence

Protection On/Off Output sequence


11

Figure 2-8 Reclosing operation logic

2.8 Post-acceleration

A one-step overcurrent post-acceleration and zero sequence overcurrent

post-acceleration protection is provided, which can be closed manually or remotely and

started by reclosing, with an opening time of 3s. The overcurrent acceleration and zero

sequence acceleration can be switched On/Off separately, and their current and delay can

be set separately. The operation logic of post-acceleration is shown in Figure 2-9.

Figure 2-9 Operation logic of post-acceleration

2.9 PT failure

The judgment criterion of PT failure depends on the wiring mode. When the PT failure

block function is switched on, if PT failure occurs, the undervoltage protection will block

the compound voltage component and current directional component. The judgment

criterion of PT failure is as follows:

V-V wiring mode

The current value of the phase with the maximum current is less than the maximum

load current (using the setting value of the overload current).

Automatic reclosing

output

Reclosing start

Switch open position

Reclosing charging indication =1

&

&

&

Reclosing On/Off

Tzdchz

Synchronization

check On

UL< synchronization check setting value

Frequency difference <0.5Hz

UL>80%Un

15s Reclosing charging indication =1Circuit breaker at closed position

Voltage difference <10V

Reclosing lock

Phase difference < setting value

Reclosing lock

&

Maximum phase current < 0.1In

&

≥

Au

tom

atic

reclo

sing

No-voltage

check On

Post-accel eration start

Po st -accel eration st art d el ay <3s

Post-accel eration input On/Off

Post-accel eration

operation message


12

① Maximum inter-phase voltage < 30V, and current of any phase > 0.1In;

② Negative sequence voltage > 8V

If any of the above conditions is met, the delay (settable) will report PT failure, and will

return when failure disappears.

Y-Y wiring mode

The current value of the phase with the maximum current is less than the maximum

load current (using the setting value of the overload current).

① When |Ua+Ub+Uc|>7V, and the modulus difference between the maximum and

minimum line voltages is greater than 18V, it is thought one or 2 phases have PT failure;

② |Ua+Ub+Uc∣> 7V, the minimum line voltage is less than 18V, used for detecting

2-phase failure.

③ When MAX{Uab，Ubc，Uca}<7V,and the current of any phase > 0.1In, it is regarded

as PT 3-phase failure.

If any of the above conditions is met, the delay (settable) will report PT failure, and will

return when failure disappears.

Figure 2-10 Operation logic of PT failure

2.10 Undervoltage protection(Undervoltage)

The inter-phase maximum voltage is taken as the voltage component for

undervoltage splitting. If the maximum line voltage is less than the undervoltage setting

value, it will trip after a delay. PT failure block low voltage protection should be set to

prevent PT failure from the wrong operation of low voltage. The operation logic of the

undervoltage protection is shown in Figure 2-11.

PT failure information

&

TPT

PT failure On/Off

|MaxU-MinU|>18V

&MinU<18V

&

MaxU<7VMaxU=Max(Uab,Ubc,Uca)MinU=Min(Uab,Ubc,Uca)

&

MaxU<30V

U2>8V

≥

&V-V wiring

Max{Ia,Ib,Ic}>0.1*In

≥

Max{Ia，Ib，Ic}<Igfh

&

≥

&

Max{Ia,Ib,Ic}>0.1*In

7V|cUbUaU|

7V|cUbUaU|

PT failure component


13

Figure 2-11 Operation logic of undervoltage protection

2.11 Non-electric quantity protection（4-20mA input.This function can be

selected or not. If it is not be selected , the contents related to DCS input in the

terminal figure have no meaning.）

The device has the 2-way non-electric quantity protection function, switched on/off by

control word.

2.12 Bus charging protection(Bus Charging)

The maximum current of phase is taken as current component for bus charging

protection. The bus charging protection starts for 3s when it is switched by manual or

telecontrol. If fault current is greater than setting value of bus charging in 3s and reaches

the delay, the bus charging protection will operate.

Figure 2-12 Operation logic of bus charging protection

2.13 Synchronization closing(Sync. Closing)

Synchronization closing function has two modes: manual synchronization closing

and remote control synchronization closing.

Synchronization closing function can check synchronous date and no-voltage

automatically. When the voltage of any side of line is less than the setting value of

no-voltage, the device will send closing pulse directly. When the voltage of two ends both

are greater than 80% of rated voltage (line voltage: 100V, voltage of phase: 100/ 3 V), it

will check synchronization and it will switch on if the synchronous conditions are met. If

synchronization time is up and it is not successful, the device will report ―synchronizat ion

closing failure‖.

Manual closing for synchronization is reclosing output.

Remote control closing for synchronization is remote closing output.

Output sequence

I>Iset

Remote closure

&

Bus charging On/Off

TManual closure

≥

3s opening time

Protection output

sequence&TddyLow-voltage On/Off

Umax>30V

PT breakPT break lock

Umax<Uddy

Circuit breaker at closed position


14

Manual closure input from

opening to closingManual closure

synchronization On

Remote controlling

closure commond

Remote closure

synchronization On

&

Frequency difference < setting value

Angle difference < setting value

Voltage difference <setting value

Synchronization time<setting value

Remote controlling closure output

≥

Voltage at this side < no-voltage

setting valueVoltage at opposite side < no-voltage

setting value

≥

With voltage at two sides

Reclosure output

&

&

Synchronization closing logic is as follows:

Figure 2-13 Synchronization closing function logic figure

2.14 Pulse energy/integral energy

Pulse energy(Can be selected or not)

The pulse circuit of the device uses an internal power supply, passive energy pulses

are input from the outside; and accumulation of pulse energy is finished by the software.

Integral energy

The software accumulates active and reactive powers into active and reactive energy

in real time.

2.15 Fault recorder

See the communication coding table for the protection voltage and current waveform

data collected by the recording unit.

3. Setting of parameters and setting values of the device

3.1 System parameters

Parameter Range Description

Setting of basic parameters

Ratting Current 0-1 Set step:1（factory default 0）00：5A；01：1A

PT Ratio 1-1500 Set step:1（factory default 1）

CT Ratio 1-5000 Set step:1（factory default 1）

CT wiring mode 0-1 Set step:1（factory default 0）00：3-phase；01：2-phase


15

Parameter Range Description

PT wiring mode 0-1 Set step:1（factory default 0）00：Y-Y；01：V-V

Harmonic Channel 0-12

For harmonic calculation, select the corresponding reference

quantity:

0：exit from harmonic calculation function

1:Ia,2:Ib,3:Ic,4:I0,5:IA,6:IB,7:IC,8:Ua,9:Ub,10:Uc,11:U0,12:UL

Wave Record 0-1 Set step:1（factory default 0）00：Off；01：On

Earth Mode 0-2 00：No Earth, 01：Earth(major grounding),

02：Res.Earth(grounding via resistor)

Bus Voltage 0-5 0:Ua、1:Ub、2:Uc、3:Uab、4:Ubc、5:Uca

D/A channel settings

DA1～2 channel

selection 0-14

Select DA1~2 to output corresponding reference quantities:

0:No D/A output

1:IA,2:IB,3:IC,4:Ua,5:Ub,6:Uc,7:Uab,8:Ubc,9:Uca,10:P,11:Q

Voltage reference quantity: 0-120V corresponding to

4mA-20mA,

Rating 5A：

Current reference quantity: 0—6A corresponding to

4mA—20mA，

Power reference quantity: 0—1000W corresponding to

4mA—20mA。

Rating 1A：

Current reference quantity: 0—1.2A corresponding to

4mA—20mA，

Power reference quantity: 0—200W corresponding to

4mA—20mA。

DA1～2 adjustment

Factor 0.5-1.5 Adjust parameters of D/A Channels 1~2 (4-20mA)

3.2 List of setting values

Setting value Range Description

Pro

tectio

n o

n/o

ff word

Instantaneous Protect On/Off

(Inst.PROT) 1/0 1/0：On/Off (factory default Off)

Delay Instantaneous Protect

On/Off

(Delay Inst.PROT)

1/0 1/0：On/Off (factory default Off)

Definite Time Overcurrent On/Off

(DT Overcurrent) 1/0 1/0：On/Off (factory default Off)


16


Instantaneous Overcurrent

Directional On/Off

(Inst.OC Dir.)


Delay Instantaneous Directional

On/Off

(Delay Inst.Dir.)


Definite Time Overcurrent

Directional On/Off

(DT OC Dir.)


Definite Time Overcurrent Negative Directional On/Off

(DT OC Neg.Dir.)


Instantaneous Compound

Voltage Lock On/Off

(Inst.CV Lock)


Delay Compound Voltage Lock

On/Off (Delay CV Lock) 1/0 1/0：On/Off (factory default Off)

Definite Time Overcurrent

Compound Voltage Lock On/Off

(DT OC CV Lock)


Inverse Time Overcurrent

(IT Overcurrent ) 1/0 1/0：On/Off (factory default Off)

Zero Sequence Overcurrent 1

Protect (ZS OC 1 PROT) 1/0 1/0：On/Off (factory default Off)


Protect (ZS OC 2 PROT) 1/0 1/0：On/Off (factory default Off)


Alarm (ZS OC 3 Alarm) 1/0 1/0：On/Off (factory default Off)


Trip (ZS OC 3 PROT) 1/0 1/0：On/Off (factory default Off)


Directional (ZS OC 1 Dir.) 1/0 1/0：On/Off (factory default Off)






17


Zero Sequence Overcurrent 1 U0

Lock (ZS OC 1 U0 Lock) 1/0 1/0：On/Off (factory default Off)





Zero Sequence Overvoltage

Alarm (ZS OV Alarm) 1/0 1/0：On/Off (factory default Off)

Zero Sequence Overvoltage Trip

(ZS OV PROT) 1/0 1/0：On/Off (factory default Off)

Overload alarm 1/0 1/0：On/Off (factory default Off)

Overload Protect (Overload PROT)


Undervoltage Protect (Undervoltage)


Under-frequency unloading (Under-frequency)


Slip block 1/0 1/0：On/Off (factory default Off)

Protect Start Auto Reclosing

(PROT Start ARC) 1/0

Inconsistent Start Auto Reclosing

(Incon.Start ARC) 1/0

Synchronous Start Auto

Reclosing (Sync.Start ARC) 1/0 1/0：On/Off (factory default Off)

Dead Line Start Auto Reclosing

(Dead L Start ARC) 1/0 1/0：On/Off (factory default Off)

Overcurrent Later Instantaneous (OC Later Inst.)


Zero Sequence Later Instantaneous (ZS Later Inst.)


PT failure alarm 1/0 1/0：On/Off (factory default Off)

PT failure lock () 1/0 1/0：On/Off (factory default Off)

Non-electric quantity 1 (Non-electric 1)


Non-electric quantity 2 (Non-electric 2)



(Bus Charging) 1/0 1/0：On/Off (factory default Off)

Manual synchronization On/Off

(Manual Sync.) 1/0 1/0：On/Off (factory default Off)


18


Remote control synchronization

On/Off

(Remote Sync.)


3-phase definite time limit overcurrent protection

Compound voltage block undervoltage

(Undervoltage)

60．00－90.00V Set step:0.01V(factory default 90V)

Negative sequence voltage (NS Voltage)

5.00-30.00V Set step:0.01V(factory default 10V)

Instantaneous current (Inst.Current)

（0.1-20）In Set step:0.01A(factory default 20In)

Delay instantaneous current (Delay Inst.C)


Definite time overcurrent (DT Overcurrent)


Instantaneous time (Inst.Time)

0.00-100.00s Set step:0.01s(factory default 100s)

Delay instantaneous time (Delay Inst.Time)


Definite time overcurrent time (DT OC Time)


Inverse time limit overcurrent protection

Inverse time trait curve

(IT Trait Curve) 1－4 Set step:1(factory default 1)

Inverse time time contant

(IT Time Contant) 0.01-1.00s Set step:0.01(factory default 1.00)

Inverse time start current

(IT Start Current) （0.1-2）In Set step:0.01A(factory default 1In)

Zero sequence overcurrent protection

Zero sequence voltage Lock

(ZS Voltage Lock) 30.00-100V Set step:0.01V(factory default 90V)

Zero sequence overcurrent 1 (ZS Overcurrent 1)

0.1-2A Set step:0.01A(factory default 2A)

（Using a system with neutral point

ungrounded as an example）


0.1-2A


0.1-2A

Zero sequence overcurrent 1 Time (ZS OC 1 Time)


Zero sequence overcurrent 2

Time (ZS OC 2 Time) 0.00-100.00s Set step:0.01s(factory default 100s)

Zero sequence overcurrent 3 Time (ZS OC 3 Time)


Zero sequence overvoltage

Zero sequence overvoltage 2－100V Set step:0.01V(factory default 100V)


19


(ZS Overvoltage)

Zero sequence overvoltage

Time (ZS OV Time) 0.00-100.00s Set step:0.01s(factory default 100s)

Overload protection

Overload current

(Overload Current) （0.1-20）In Set step:0.01A(factory default 20In)

Overload time

(Overload Time) 0.00-100.00s Set step:0.01s(factory default 100s)

Undervoltage protection

Undervoltage value (Undervolt. Value)

30－100V Set step:0.01V(factory default 50V)

Undervoltage time (Undervolt. Time)


Under-frequency unloading

Under-frequency unloading (Under-freq.Value)

45.00-50.00Hz Set step:0.01Hz(factory default 48Hz)

Under-frequency time (Under-freq.Time)


Low current lock 0.2-5A Set step:0.01A(factory default In)

Undervoltage lock (Undervolt. Lock)


Slip block 0.5-8.00Hz/s Set step:0.01Hz/s(factory default 3Hz/s)

Reclosing

Auto reclosing time (ARC Time)


Auto reclosing sync-angle (ARC Sync-Angle)

0.00-50.00° Set step:0.01°(factory default 20°)

Auto reclosing dead line Voltage (ARC Dead Line V)


Post-acceleration

Overcurrent later instantaneous current

(OC Later Inst.C)


Zero sequence later instantaneous current

(ZS Later Inst.C)

0.1-2A Set step:0.01A(factory default 1A)

Overcurrent later instantaneous time (OC Later Inst.T)


Zero Sequence later instantaneous time

(ZS Later Inst.T)


PT failure setting value

PT failure delay 0.50-10.00s Set step:0.01s(factory default 10s)


20


Non-electric quantity protection

Non-electric 1 value (Non-elec.1 Value)

4.00-20.00mA Set step:0.01mA(factory default 20mA)

Non-electric 1 time (Non-elec.1 Time)


Non-electric 2 value (Non-elec.2 Value)

4.00-20.00mA Set step:0.01mA(factory default 20mA)

Non-electric 2 time (Non-elec.2 Time)



Bus charging current

(Bus Char.Current) 0.1-100.00A Set step:0.01A(factory default 100A)

Bus charging time

(Bus Char.Time) 0.00-3.00s Set step:0.01s(factory default 0s)

Synchronization closing

Synchronization voltage

difference

(Udiff-SyncClose)

0.03-10V Set step:0.01V(factory default 10V)

Synchronization frequency

difference

(Fdiff-SyncClose)

0.1-2Hz Set step:0.01HZ(factory default 2Hz)

Synchronization angle

difference

(Adiff-SyncClose)

10-30° Set step: 0.01°(factory default 10°)

Synchronization time

(T-SyncClose) 1-100s Set step:0.01s (factory default 100s)

Synchronization no-voltage

check (No-Voltage-Sync)

5-90V Set step:0.01V(factory default 10V)

4. Description of binary input, output and analog quantity

4.1 Monitoring of analog quantities

Analog quantities can be monitored under the [Protection Data Display], [Measured

Data Display] and [Pulse Energy] menus in the [State Display] menu, press the ――,

―― keys to flip over. The factory precision of the device has been calibrated. The

protection current is calibrated at double the rated current and the measuring current at a

single rated current. The list is as follows:

Note: for protection CT 3-phase, PT Y-Y wiring; due to the under-frequency

unloading protection of this device, the frequency display is put in the protection data.


21

Analog quantity

terminal

Analog quantity

name Test method

Terminals D01、D02 Protective Phase A

current (Ia)

Add double the rating, displayed deviation not

exceeding 1%

Terminals D03、D04 Protective Phase B

current (Ib)


exceeding 1%

Terminals D05、D06 Protective Phase C

current (Ic)


exceeding 1%

Terminals D07、D08 Zero sequence

current (I0) Add 1A, displayed deviation not exceeding 0.2%

Terminals D09、D10 Measured Phase A

current (IA) Add rating, displayed deviation not exceeding 0.2%

Terminals D11、D12 Measured Phase B

current (IB)

Add a single rating, displayed deviation not exceeding

0.2%

Terminals D13、D14 Measured Phase C

current (IC)

Add a single rating, displayed deviation not exceeding

0.2%

Terminals D15、D16 Phase A voltage

(Ua) Add 50V, displayed deviation not exceeding 0.5%

Uab System frequency F Add 50V 50Hz, displayed deviation not exceeding

±0.02Hz

Terminals D17、D18 Phase B voltage

(Ub) Add 50V, displayed deviation not exceeding 0.5%

Terminals D19、D20 Phase C voltage

(Uc) Add 50V, displayed deviation not exceeding 0.5%

Terminals D21、D22 Zero sequence

voltage (U0) Add 50V, displayed deviation not exceeding 0.5%

Terminals D23、D24 Line voltage (UL) Add 50V, displayed deviation not exceeding 0.5%

Terminals D23、D24 Line frequency（F） Add 50V 50Hz, displayed deviation not exceeding

±0.02Hz

Terminals D25、D26 4～20mA DC Input

1 Add 10mA, displayed deviation not exceeding 3%

Terminals D27、D28 4～20mA DC Input

2 Add 10mA, displayed deviation not exceeding 3%

Terminals D09、D10；

D13、D14 add current

by polarity；D15、D16；

D17、D18；D19、D20

add voltage by polarity

3-phase active

power

Add a single rating to current and 100V to line voltage

Alter phase angle, displayed power deviation not

exceeding 0.5%


22

Analog quantity

terminal

Analog quantity

name Test method

Terminals D09、D10；

D13、D14 add current

by polarity；D15、D16；

D17、D18；D19、D20

add voltage by polarity

3-phase reactive

power

Add a single rating to current and 100V to line voltage

Alter phase angle, displayed power deviation not

exceeding 2%

Terminals C12 and

C16(common terminal

of pulse +24V)

Pulse 1（MC1） Connect each point once, add 1 to the count

Terminals C13 and

C16(common terminal

of pulse +24V)


Terminals C14 and

C16(common terminal

of pulse +24V)


Terminals C15 and

C16(common terminal

of pulse +24V)


4.2 Monitoring of binary input

Binary input can be monitored under the [Binary input] menu in the [State Display]

menu, press the ――, ―― keys to flip over.

Binary input

terminal

Binary input name Test method

B01 Common terminal of binary

input -

（Should be connected to

DC220V or DC110V

negative terminal of external

power supply）

External power supply of 220V or 110V

DC can be applied, connect the

negative terminal to terminal B01,

positive terminal to terminal B02～B13,

in [Binary input] menu in the [State

Display], the status of binary input can be

seen.

The device also has a 24V DC

supply, if it is used, terminal B14 can be

connected to terminal B02 ～ B13, in

[Binary input] menu in the [State Display],

the status of binary input can be seen.

B02 Breaker position

B03 Trolley run position

B04 Trolley test position

B05 Earth switch position

B06 Spring is not energized

B07 Input 6


23

B08 Input 7 Please note about the binary input

voltage upon ordering, it is set to

DC220V by default.

B09 ARC Lock

B10 Input 9

B11 Input 10

B12 Input 11

B13 Chk.Sync.Manu.

B14 Positive terminal of internal

24V power supply

4.3 Monitoring of binary output

Binary output can be monitored under the [Binary output] menu, press the ――,

―― keys to flip over.

Binary output terminals Binary output name Test method

B15-B16 Device Failure

Select open and close menu, use ―+‖,

―-‖ key to operate and test the

corresponding terminals. B31-B32

and B34-B35 are common open

terminals that should close.

B17-B18 Trip Signal

B19-B20 Alarm Signal

B21-B22 Chk.Sync.Manu.

B23-B24 Output 5

B25-B26 PROT Output 1

B27-B28 PROT Output 2

B29-B30 Reclose Output

B31-B32（Common

open） Output 9

B32-B33

B34-B35（Common

open） Output 10

B35-B36

A22-A23 Remote Close

A22-A24 Remote Trip

5. Operation instructions

5.1 Control panel of device


24

128*64 matrix LCD (The LCD will go off after a period of absence of keyboard operation;

the LCD will be illuminated automatically when any key is pressed or in case of

protection trip or alarm.)

Signal indicator: operation, communication, operation, alarm, reclosure, fault (of the

device)

Circuit breaker state indication: indicating the current state of the circuit breaker (―Open‖,

―Close‖ position indication)

Remote/local selection signal, local opening/closing button

Key pad: , , , , Cancel, -, +, Enter, Revert

The 6-bit nixie tube displays the primary measured values in real time: IA, IB, IC, Uab,

Ubc, Uca, P, Q, Cosφ. (Please set the PT, CT transformation ratios properly in the System

Parameters menu). The maximum display range of the power on the nixie tube is: 99999. Note: Measurement IA: AA, measurement IB: bA, measurement

IC: CA,

voltage Uab: AbKV, voltage Ubc: bCKV, voltage Uca: CAKV,

active power: PKW, reactive power: qKVar, power factor: H

5.2 Instructions for use of key pad and LCD display

During the device’s normal operation, it will display the measuring current, power,

time and statue (indicating whether reclosure charging is finished) in cycle. Press the

―Enter‖ key to enter the main menu, which is a multi-level tree menu. Press the ――,

―― keys to move the cursor to the desired entry, press the ―Enter‖ key to enter this entry,

and press the ―Cancel‖ key to return to the next higher level of screen. If this screen is still


25

Main menu

1·State Display

2·Signal Revert

3·Report Display

4·Output Test

5·SYS Parameters

6·Setting Value

7·Clock Setting

8·Password

9·Version Info

a menu, continue to press the ――, ―― key to select the desired entry, press the ―Enter‖

key to enter the next level of screen, and press the ―Cancel‖ key to return to the next

higher level of menu. If there is no menu screen, be sure to press the ―Cancel‖ key to

return to the next higher level of menu. The main menu is shown at the center of the

following figure, with the corresponding submenus on both sides.

The main interface displays the primary operating parameters in turn. The maximum

displayed value of the primary is 6000.0A. For systems with a rated current of 5A, the set

CT transformation ratio shall not exceed 2000. If the primary power is greater than

1000kW, the display unit is MW, otherwise is kW.

Note 1: For the Setting menu, see the description of each device.

State Display

5．Parameters

Setting Zero No.

Comm. Setting

B. Parameters

D/A Setting

Pulse Energy

Trip Times Clear

Channel Coef.

7．Clock setting

Date：□□-□□-□□

Time：□□:□□:□□

8． Password

□□□□

Model：M□PR-600Hb

Version：V□.□□.□□

Date：20□□－□□－□□

CRC：□□□□□□□□H

1．State Disp

Protection Data

Measuring Data

Binary Input

Pulse Energy

Phase Angle

Harmonic Data

DC Input Data

Trip Times

2．Signal Revert

Enter

3．Report Dis.

Trip Report

Binary Report

Event Report

Report Clear

4．Output Test

Device Failure

Trip Signal

Alarm Signal

Chk.Sync.Manu.

Output 5

PROT Output 1

PROT Output 2

Reclose Output

Output 9

Output 10

Remote Close

Remote Trip

6．Settings（Note 1）

Protect On/Off

。。。。。。

Note: See protection

setting table for detailed

setting menus


26

The [State Display] menu contains 8 submenus, including protection data, measuring

data, binary input, pulse energy, angle display, harmonic data, DC measurement and trip

statistics. It is described as follows:

Note: In the standard configurations, the input circuit has the connection to an

external 220VDC control power supply. When no DC control power supply or control

system is available on site, but a 110VDC control power supply is available, a 110VDC

control power supply may be used for direct connection through local hardware

Protection Data ↑ ↓

Ia = □□□·□□ A

Ib = □□□·□□ A

Ic = □□□·□□ A

Uab = □□□·□□ V

Ubc = □□□·□□ V

Uca = □□□·□□ V

U2 = □□□·□□ V

U0 = □□□·□□ V

I0 = □□□·□□ A 。。。。。。

Protection CT secondary current value

PT secondary line voltage value

Zero sequence current

Zero sequence voltage

Measuring Data ↑ ↓

IA = □□□·□□ A

IB = □□□·□□ A

IC = □□□·□□ A

Ua = □□□·□□ V

Ub = □□□·□□ V

Uc = □□□·□□ V

P = □□□□·□ W

Q = □□□□·□ var

Cosφ = □·□□□ 。。。。。。

Measuring CT secondary current value

PT secondary phase voltage value

Cosine function for included angle of voltage and

current; for -90°<φ<90°, COSφ is positive; for 90°<

φ<270°, COSφ is negative

Converted to PT, CT secondary active power

Converted to PT, CT secondary reactive power

When Closed, energy storage not completed

Binary Input ↑ ↓

Breaker： □

Trolley Run: □

Trolley test: □

Earth Switch : □

Spring: □

Input 6 ： □

Input 7 ： □

ARC Lock ： □

Input 9 ： □

Input 10 ： □

。。。。。。

Description varies with model, see corresponding terminal

diagram for details

At Closed, breaker is at closed position; at Open, breaker is at open

position. Note: The position of the breaker relates to protection logic,

with fixed position.

When Closed, trolley at running position

When Closed, earth switch at closed position

When Closed, trolley at test position

Negative seque.voltage


27

adjustment, or the 24V power supply of the device may be used as the input power supply

(when the input common terminal is +24V, terminal number: B14, Terminal B01 is kept

float). However, this must be specified upon ordering.

Trip Times

Total □□□□ times

Phase Angle ↑ ↓

Ua：□□□·□□°

Ub：□□□·□□°

Uc：□□□·□□°

Ia：□□□·□□°

Ib：□□□·□□°

Ic：□□□·□□°

IA：□□□·□□°

IB：□□□·□□°

IC：□□□·□□°

UL：□□□·□□° 。。。。。。

Phase angle relative to Ua, Ua as 0° by default.

When wiring method is VV, it displays line voltages

relative to Uab, the same as follows

Phase angle of protection current relative to Ua

Phase angle of measuring current relative to

Ua

Pulse Energy ↑ ↓

MC1：□□□□□□□□□□

MC2：□□□□□□□□□□

MC3：□□□□□□□□□□

MC4：□□□□□□□□□□

＋□□□□□□□·□□□kWh

＋□□□□□□□·□□□kvh

－□□□□□□□·□□□kWh

－□□□□□□□·□□□kvh

External pulse energy input counting (4-way)

DC Input ↑ ↓

DC1：□□□·□□mA

DC2：□□□·□□mA External DC input 4~20mA (2-way)

Accumulation of the device’s real-time active and reactive

calculations over time, + for positive direction, - for negative

direction.

Harmonic ↑ ↓

I2： □□□·□□%

I3： □□□·□□%

I4： □□□·□□%

I5： □□□·□□%

。。。。。。

I11： □□□·□□%

2~31st harmonics for which analog channels have been

selected in system


28

Signal revert

In the [Signal Revert] menu, press the ―Enter‖ key, the signal relay and the ―Operation‖

indicator on the panel will be reset.

Report Display

The [Report Display] menu includes 4 submenus, including trip report, binary report, event report and report clear. Event recording includes: device self-check fault, device setting value modification, system parameter modification and setting zone number modification, etc. Trip report can be record for the last 50 events, binary report for 100, event report for 30 at most. Beyond this, the latest report will overwrite the earliest one. Press the ―Enter‖ key to enter the corresponding [To view xx report, please enter report

number: 00 ] menu, and enter any figure within storage volume, press the ―Enter‖ key to display the contents of that report. The screen is as follows:

Press key to see the specific operation value. Press and keys to flip over.

Operation values

Output test

After entering the [Output Test] menu, the correct password is required to enter the

[Output Test] menu. It displays the following:

Press ―Enter‖ key

——————＞

＜——————

Press ―Cancel‖ key

(Note: When the test is performed on the 6 protection outputs, the starting relay will

be in the ―Closed‖ state automatically. The ―+‖, ―-‖ keys are used for switching between the

―Close/Open‖ control.)

System parameters

After entering the [SYS Parameters] menu, the correct password is required to enter

the [SYS Parameters] menu. It displays the following:

4．Output test ↑ ↓ Device Failure

Trip Signal Alarm Signal Chk. Sync. Manu Output 5 PRO Output1 PRO Output2

。。。。。。

Operate All

Device Failure

Close Open

Report No.：□□ ↓

20□□-□□-□□

□□：□□：□□：□□□

□□□□□□

Report No. of this report

Year, month, day, hour, minute, second and

millisecond when it took place

报告内容描述


29

Setting Zone No.: range 00~07.

Comm. setting

Setting of basic parameters (see the description of the protection device for basic

parameters)

5．Parameters ↑↓

Setting Zone No.

Comm. Setting

Basic Parameters

D/A setting

Pulse Energy

Trip Time Clear

Channel Coef.

Comm. setting ↑ ↓

RS485 Address

□□ RS485 Baud rate

□□

Pulse Input Time

□□□□ms

IP Address

□□□. □□□. □□□. □□□ Subnet Mask

□□□. □□□. □□□. □□□ K W Default

□□□. □□□. □□□. □□□

Communication address of device 01～99

00：2.4KB；01：4.8KB；02：9.6KB；03：

19.2KB；04：38.4KB；05：115.2KB

Confirmation time of 4-way pulse

energy, >10mS, < impulse width of

kilowatt-hour meter

For Ethernet communication

Setting the CT secondary current rating 00: 5A; 01: 1A

Setting the PT transformation ratio: 1~1500

Setting the CT transformation ratio: 1~5000

B. Parameters: ↑↓

Rating Current

□□ PT Ratio

□□□□

CT Ratio

□□□□ CT Wiring Mode

□□ PT Wiring Mode

□□ Harmonic Channel

□□

□ 。。。。。。

Setting the CT secondary wiring mode00: 3-phase; 01: 2-phase

Setting the PT secondary wiring mode00: Y-Y; 01: V-V

Setting analog quantity channels 0~12 for harmonic monitoring,

select 0 to exit from the harmonic calculation function


30

D/A setting

The device has two 4~20mA outputs. The DA1~DA2 adjustment factor is used to

adjust the accuracy of the channel output. The DA1~DA2 channel selection is used to

select the corresponding analog quantity channel (see the description of the protection

device for specific reference quantities). In the accuracy test, make sure the field ground is

in good contact; otherwise the accuracy might be affected.

Pulse energy setting

Energy base numbers can be set, including Pulse 1, Pulse 2, Pulse 3, Pulse 4,

positive active energy, positive reactive energy, negative active energy and negative

reactive energy.

Clear trip times

It is used to clear the trip times.

Settings

After entering the password, you can enter the [Setting Value] menu. See the settings

description of the protection device for the detailed description.

Clock setting

A battery-back real-time clock is provided in the device, which can perform time

adjust remotely via the communication network or in-site time adjust in the [Time Setting]

menu.

Enter this menu and press the ―Enter‖

key, the clock will stop refreshing and a

cursor will appear. Move the cursor to the

desired position for modification by pressing

the ――, ―― keys, modify to the desired

value with the ―+‖, ―-‖ keys. Press the

―Enter‖ key to complete setting. If the

―Cancel‖ key is pressed, the setting will be

cancelled and the screen continues to

refresh the clock.

Password

The [Password] menu is used to modify the password for entry into the Settings,

System parameters and Output Test submenus. The initial password is provided by the

factory. The universal password is ―1000‖.

Move the cursor to the desired

position for modification by pressing the

――, ―― keys, modify to the desired

password with the ―+‖, ―-‖ keys. Press the

7.Clock setting

Date：20□□－□□－□□

Time： □□：□□：□□

Input password

0 0 0 0


31

Figure 6-1

MLPR-610Hb

D1(3,5)

D2(4,6) A01

D15

D17

D19 A02

D16(18,20)

14(16,18)

Ia’(Ib’、Ic’)

Ia(Ib、Ic)

Ua

Ub Power supply

Uc

Ua’(Ub’、Uc’)

Figure 6-1

―Enter‖ key to enter the new password

setting menu as above; press the

―Cancel‖ key to cancel the setting.

GPS clock synchronization

The GPS clock synchronization signal is input as rs485 differential voltage, the device

is able to receive GPS clock minute synchronization(or second synchronization). If there is

GPS signal, there will be and flashing on the bottom of cycle menu; otherwise

won’t.

The principle of GPS clock synchronization: The second pulse or minute pulse act

with the monitoring system, the time base with second precision is sent by monitoring

system, when the GPS second differential signal arrives, the time base is unified and the

milliseconds are cleared.

Version Info In the main menu, after entering the [9. Version Info] menu, the model, software

version and date of the device will be displayed.

Note: For a corresponding nonstandard model, the device’s displayed model does not

have to be changed.

6. Check of protection function

6.1 Check of three-phase overcurrent protection(Three-step OC)

Overcurrent protection is divided to three phases which can be set and On/Off

separately. Their principle is same, now take the overcurrent phase I for example. To wire

as Figure 6-1, switch on overcurrent phase I protection and overcurrent direction, and

compound voltage is switched on.

See the following table and set. To measure operation current value and keep a

record in the following table. The measuring terminals B17-B18,B25-B26,B27-B28 should


32

be shorted when the instantaneous overcurrent protection operates.

Input the

current of

phase A and

add 30V to

voltage

Ubc.Take the

voltage phase

as reference

and check the

operation zone.

Setting value of

instantaneous

current (A)

1 time of

rating

2 times

of rating

5 times

of rating

10 times

of rating

Operation value

Operation zone

Input the

current of

phase B and

add 30V to

voltage

Uca.Take the

voltage phase

as reference

and check the

operation zone.

Setting value of

instantaneous

current (A)

1 time of

rating

2 times

of rating

5 times

of rating

10 times

of rating

Operation value

Operation zone

Input the

current of

phase C and

add 30V to

voltage

Uab.Take the

voltage phase

as reference

and check the

operation zone.

Setting value of

instantaneous

current (A)

1 time of

rating

2 times

of rating

5 times

of rating

10 times

of rating

Operation value

Operation zone

Instantaneous

overcurrent

setting value is

5A and input

Setting value of

under voltage(V) 20 40 60 80

Low voltage

block value


33

6A current. Setting value of

negative sequence

voltage (V)

5 10 15 20

Negative

sequence voltage

block value

6.2 Check inverse time overcurrent protection(IT Overcurrent)

To wire as Figure 6-1.Overcurrent protection is provided, and inverse time of

overcurrent mode is set. Select one curve in ―IT Trait Curve‖（01：standard inverse time

limit, 02：unusual inverse time limit, 03：extreme inverse time limit, 04：long inverse time

limit），the time constant τp of inverse time limit is set as 0.50s and the current Ip of

inverse time limit is set as 5A. See the following table and set and check for inverse time

limit. The measuring terminals B17-B18, B25-B26, B27-B28 should be shorted when

inverse time limit overcurrent protection operates.

Curve

selection

Operating value

of inverse time

limit

2Ip(A) 3Ip(A) 5Ip(A)

01：Standard

inverse time limit

Ip=5A，τp=0.5s

Reference

operating time

5.105s 3.15s 2.140s

Actual

operating time

02：Unusual

inverse time limit

Ip=5A，τp=0.5s

Reference

operating time

6.750s 3.375s 1.688s

Actual

operating time

03：Extreme

inverse time limit

Ip=5A，τp=0.5s

Reference

operating time

13.333s 5.000s 1.667s

Actual

operating time

04：Long inverse

time limit

Ip=5A，τp=0.5s

Reference

operating time

60.000s 30.000s 15.000s

Actual

operating time

6.3 Check of zero sequence overcurrent protection(ZS Overcurrent)

Zero sequence overcurrent protection is divided to three phases which can be set


34

Figure 6-2

U0

U0’

+WC

-WC

Power supply

MLPR-610Hb

D21 A01 D22 B02 A02 B01

Figure 6-3

On/Off separately. Their principle is same, now take the zero sequence overcurrent phase

I for example. To wire as Figure 6-2 and switch on zero sequence overcurrent phase I

protection and zero sequence direction. It will have zero sequence voltage block function

when zero sequence voltage block is switched on.

Power supply

See the following table and set. Measure operation current value and keep a record in

the following table. The measuring terminals B17-B18, B25-B26, B27-B28 should be

shorted when the zero sequence protection operates. (YY connection is taken for

example.)

Open U0(V) ≥15 ≥15 ≥15 ≥15

Calculate 3U0(=UA) ≥15 ≥15 ≥15 ≥15

Setting value of zero

sequence current(A) 0.20 0.50 1.00 1.50

Operation value

Operation zone

6.4 Zero sequence overvoltage protection(ZS Overvoltage)

Open-delta voltage is taken as zero sequence overvoltage protection voltage, which

can be set as trip or alarm. To wire as Figure 6-3, switch on zero sequence voltage alarm.

MLPR-610Hb

D15

D16 A01

D21

D22 A02

D07

D08

3U0

3U0’

3I0

3I0’

Ua

Ua’


35

Ia(Ib、Ic)


Power supply

Figure 6-4


the following table. The measuring terminals B19-B20 should be shorted when zero

sequence voltage alarm operates.

Setting value of zero

sequence voltage(V) 10 20 30 50

Zero sequence

voltage delay(s) 1 10 50 100

Zero sequence

voltage operation value(V)

Zero sequence

voltage operation time(s)

6.5 Check of overload protection

The maximum current of phase is taken as overload protection current to check,

which can be set as trip or alarm. To wire as Figure 6-4, switch on overload alarm.


the following table. The measuring terminals B19-B20 should be shorted when overload

alarm operates.

Setting value of overload(A) 5 10 15 20

Overload delay(s) 10 5 2 1

Overload operation value(A)

Overload operation time (s)

6.6 Check of under-frequency unloading protection（Under-frequency）

The frequency of under-frequency unloading protection is derived from the measuring

frequency of voltage Uab. It has frequency slip block (Which can be On/Off) and under

current block against load feedback. To prevent fast voltage drop from wrong operation of

MLPR-610Hb

D1(3,5) A01

D2(4,6) A02


36

Ia

Ia’

Ua(Ub)

Ua’(Ub’)

Power supply

Figure 6-5

Power supply

frequency protection, under frequency unloading protection provides undervoltage block.

To wire as Figure 6-5, switch on under-frequency unloading protection. If slip frequency is

needed, switch on slip block. Slip block should be switched off so as not to affect

operation accuracy when frequency operation value or operation delay is measured.

See the following table and set. Measure operation value and keep a record in the

following table. The measuring terminals B17-B18、B25-B26、B27-B28 should be shorted

when under-frequency unloading protection operates.

Setting value of under-frequency(Hz) 49.5 49 48.5 48

Setting value of under current(A) 0.5 0.5 1 1

Setting value of under voltage(V) 10 20 30 60

Setting value of slip block(Hz/s) 3 4 5 7

Setting value of under-frequency

operation delay(s) 0.5 1 2 3

Under-frequency operation value(Hz)

Under-frequency operation time(s)

Slip block value(Hz/s)

6.7 Check of auto reclosing and later instantaneous trip

To wire as Figure 6-6 and check according to the following method.

Figure 6-6

MLPR-610Hb D1

A01 D2 D15(17)

A02 D16(18)

MLPR-610Hb

D1 A01

D2 B01 A02 B02

Ia

Ia’

DL


37

Check of protection starting method: Protection starting reclosing method is

provided, which reclosing delay is set as 2.00s.To switch on overcurrent

post-acceleration, which post-acceleration delay is set as 0.00s.To connect terminals

B01-B02, the charging sign will come up after 15s. Add fault current to make

instantaneous or overcurrent protection operate. Remove the fault current, the reclosing

will operate after 2s. Add fault current again, the overcurrent post-acceleration protection

operates immediately.

Check of non-corresponding starting method: When circuit breaker trips, not manual

trip or remote control trip, the reclosing will be started. To switch on non-corresponding

starting reclosing, and connect terminals B01-B02, the charging sign will come up after

15s. To open terminals B01-B02 (analog breaker trip), reclosing will operate after 2s.

Reclosing has no-voltage check and synchronization check function. To switch on

no-voltage check, the reclosing will be blocked when voltage UL is greater than setting

value of no-voltage check. To switch on synchronization check and select

synchronization voltage in parameter menu, the reclosing will be blocked when the

skewing between voltage UL and synchronization voltage is greater than

synchronization check angle. Both of the voltage at two ends should be greater than

80% of rated voltage (line voltage: 100V , phase voltage: 100/ 3 V).

6.8 Check of PT failure function

Add balanced 3-phase voltage (57.7V), device should report PT failure when any one

or two phases are removed. Add protection current but no voltage, which is greater than

no-current setting value, device should report PT failure (used for YY connection).

Measuring terminals B19-B20 should be shorted.

6.9 Check of undervoltage protection function

To wire as Figure 6-7. Input the voltage of phase A,B,C, switch on undervoltage

protection and close the breaker. See the following table and set. To measure operation

voltage value and keep a record in the following table. The measuring terminals

B17-B18、B25-B26、B27-B28 should be shorted when undervoltage protection operates.

Undervoltage protection will be blocked when PT is failure and PT failure lock

undervoltage is switched on.


38

Power supply

Figure 6-7

Setting value of

undervoltage(V) 30 50 70 90

Operation value

6.10 Check of bus charging protection

To wire as Figure 6-8, port 1 and 2 are current input of phase A, port 3 and 4 are

current input of phase B, port 5 and 6 are current input of phase C. Switch on bus charging

protection. Terminal A19 is connected with –WC, +WC and terminal A15 are shorted

immediately, using analog manual closing. Bus charging protection should operate when

input fault current in 3s. And bus charging protection should not operate when input fault

current after 3s. See the following table and set. Measure operation current value and

keep a record in the following table. The measuring terminals B17-B18、B25-B26、

B27-B28 should be shorted when bus charging protection operates.

Figure 6-8

Setting value of

bus charging current

(A)

1In 2In 5In 10In

Operation value

MLPR-610Hb D15 A01 D17

D19 A02 D16 (18,20)

Power supply

Ua

Ub

Uc


MLPR-610Hb

D1(3,5) A01 D2(4,6) A19 A02 A20

Ia(Ib、Ic)


-WC

+WC


39

6.11 Check of synchronization closing function(Sync. Closing)

To wire as Figure 6-9, switch on manual closing synchronization function. In the

parameter menu, synchronization voltage is set as Uab, setting value of synchronization

angle is set as 20°, setting value of synchronization frequency difference is set as 1Hz,

setting value of synchronization voltage difference is set as 5V, setting value of

synchronization no-voltage closing is set as 70V, synchronization time is set as 60s.

Add 100V/50Hz AC voltage to UAB, add a voltage with less than 70V, and 50Hz of

frequency to UL. Connect B01-B13 and then open, simulate manual synchronous closure.

The device checks out no-voltage closure, after the terminals B29-B30 closed for 600ms,

it will return, and the closure pulse is provided. Increase the voltage of UL to 98V and

adjust the frequency as 49.5Hz, the device will capture synchronization in 60s. The

terminals B29-B30 will return after closure of 600ms when voltage difference, frequency

difference, phase angle difference are content with the setting value.

The remote closure synchronous function is switched on, under the background

monitoring system and after sending closure command, the device will capture

synchronously as manual closure checking synchronization. If it captures successfully in

the time of synchronization, the terminals B23-B24 are closed for 600ms and it will send

closure pulse.

Figure 6-9

MLPR-610Hb D15 D17 A01 D19 D16(18,20) D23 A02 D24

Power supply

Ua

Ub

Uc


UL

UL’


40

7.1 Terminal diagram of the device

Figure 7-11 Terminal diagram of MLPR-610Hb

Input 6

IC'IC

IB'IB

Ua

Uc

Ub'

Ua'

Ub

Uc'

UL'

U0'U0

UL

(+24V)

注：1.Ia,Ib,Ic are protective currents.2.I0 is zero-sequence current.3.IA,IB,IC are measuring currents.4.Ua,Ub,Uc are bus voltages.5.U0 is zero-sequence voltage.6.UL is line voltage.7.DCSIn is 2-way 4～20mA DC

input.8.Net1,Net2 are ethernet interfaces, COM1, COM2 are 485 interfaces.9.If +24V is the standard configuration or not on IO board, it is used as input power supply only when using internal 24V.

Input 7

Input 10

Input 9

D02

D04

D06

D08

D10

D12

D14

D16

D18

D20

D22

D24

I/OPOWER

B01

B02

ON B06B05

B04B03

IaD01

IbD03

IcD05

D07

OFFB10

B08B09

B12

B14

B13

B11

B07

A02

A01

I0

D09

D11

D13

D15

B17B18

B16

B19

B21B20

D17

D19

D21

D23

B23B24

B25B26

B27B28B29

B22

A04

A06A05

B15A03

B30B31

B32

B34B35

B36

B33

CPU

Ia'

Ib'

Ic'

AC

I0'

Debug

COM2

COM1

Net2

Net1

Run

C13

C17

C19

C20

C18

C16

C14C15

C12

C10C11

C08

C09

C06

C07

C02

C04C05

C03

C01

A21

A23A24

A22

A19

A20

A18

+WC

-WC

A10

A17A16A15A14

A13A12A11

A08A09

A07

DCSIn2+

DCSIn2-

DCSIn1-

DCSIn1+D25

D27D28

D26

Input 11

IA IA'

Chk.Sync.Manu.


41

7.2 Typical wiring diagram of the device

Figure 7-12 Typical wiring diagram of MLPR-610Hb

AC

plug-in DCSIn1+

DCSIn2+

DCSIn2-

DCSIn1-

WC

WC

MLPR-610Hb microcomputer protection and monitoring device

Debugging port

Net2

I/O plug-in unit

Operating circuit failure

Device power+

Power off

Shielded ground

Device power-

Trip position

Closed position

Closed position monitoring

Trip coil

Trip position monitoting

Closing coil

-WC

Remote control common terminalRemote control closingManual closing iniput

Device panel＋WC

Remote control trip

Manual trip input

+WC

Input 7

Input 6

Spring

GEarth Switch

Trolley test

Trolley run

Breaker

Input common

terminal-

Pulse 1（）

Pulse 2（ 2）

Pulse common＋24V

COM A

COM A

COM B

COM B

Shielded ground

COM A

COM A

COM B

COM B

DCSOut1+

A A B B

Pulse 3（）

Pulse 4（ 4）

DCSOut1-

DCSOut2+

DCSOut2-

Positive active pulse

Positive reactive pulse

Negative active pulse

Negative reactive pulse

Pulse common＋24V

CC

LARC Lock

Shielded ground

Note：

1.As shown in the figure,the ZK(remote/local changeover switch) and KK(manual operating switch) are installed on

the switchboard panel.When remote/local changeover switch and manual operating switch of device panel are used,terminal A21 is connected to +KM. 2.As shown in the figure,PT secondary is star connection,when V－V wiring is present, terminals D15,D20 are connected to phase A of PT secondary,terminals D16,D17 to phase B of PT secondary,terminals D18,D19 to phase C of PT secondary.

Zero-sequence current Measuring current Line voltage

plug-in unit

Pow

er

plug-in unit

CP

U

WC

WC

PROT Output 1

PROT Output 1

Alarm signal

Alarm signal

Chk.Sync.Manu.

Reclose Output

Output 9

normally open

Output 9 normally

closed

Device Failure

signal

Device Failure

signal

Trip Signal

AC plug-in unit

ccbbaaa a b b c c

Circuit

breaker

Bus voltage Zero-sequence voltage Protective current

Input 9

Input 10

Input 11

IChk.Sync.Manu.

（+24V）

Trip Signal

Chk.Sync.Manu.

Output 5

Output 5

PROT Output 2

PROT Output 2

Output 9 common

Output 10

normally closed

Output 10 common

Output 10

normally open

Reclose Output

t

Net1


42

Part 8 Operating circuit of MXPR-600Hb series device

8.1 Use of external changeover and operating switches

Traditional operating circuits are started by current, while a voltage maintaining circuit

realizes electric trip prevention. An anti-trip relay will be selected depending on the current

of the trip/closing circuit of the circuit breaker. However, this has poor generality and can

hardly be realized for circuit breakers with low trip and closing currents (such as 10KV

circuit breakers from AEG Company in Germany, whose trip and closing currents are not

greater than 0.2A). To simplify wiring and design finalization, and to improve the generality

of the product, we offer a new operating circuit shown below.

Reclosing

1LP

Tn1

JnTn2

Fuse

Clo

sing c

ircuit

Small bus

DL HQ

A16

TBJ2

TBJ1

A19TBJ

Closing output

Trip

circ

uit

Protection

DLTQ

DL

A18

A14

A13HWJ

TWJ

A12

A10TWJ

HWJ

A08TWJ

Off position

On position

A15

A24

YHJ

854ZK KK

2

A22

A23YTJ

A17

Tn1

Jn

3

768

2LP

ZK KK

A20

A11

A09

Tn2

1

6

A07

ZK

HWJ

Remote

controlled

switch-on

Operation circuit

disconnected

Manual and

anti-trip

Remote

control

opening

Manual and

trip output

Closed position

output

Trip position

output

Schematic diagram of operating circuit 1


43

In the diagram, KK is a traditional operating switch, used for manual trip/closing

operations, ZK is a changeover switch, used for changeover of local and remote control.

When ZK is at the ―Remote‖ position, the power of the remote control circuit will be

switched on, i.e., Terminal A22 of the device is connected to +KM, and the power of the

manual operating circuit is cut off, disabling manual closing and manual trip. On the

contrary, when ZK is at the ―Local‖ position, the power of the manual operating circuit is

switched on and that of the remote control circuit is cut off.

Note: The dotted line outlines the internal circuit of the protection device. All our

devices marked with ―anti-trip circuit‖ are designed on this operating circuit.

Terminals Tn1, Tn2 corresponding to the protection relay Jn are determined by the

corresponding protection output control word. Jn can be any one or more of Protection

outputs 1-8.

Whether local or remote control, the precondition to jump is Terminal A15 of the device is

always connected to +KM. After manual or remote controlled closing, if a short-circuit fault

occurs, the protection will operate to trip the circuit breaker. Though Terminal A15 of the

device is connected to +KM, the closing circuit is disconnected by TBJ1 and will not be closed

again. In this way, circuit breaker jump is effectively prevented.


44

8.2 Use of trip and closing buttons on the panel

Reclosing

1LP

Tn1

JnTn2

Fuse

Clo

sing

circ

uit

Small bus

DL HQ

A16

TBJ2

TBJ1

A19TBJ

Trip

circ

uit

Protection

DLTQ

DL

A18

A14

A13HWJ

TWJ

A12

A10TWJ

HWJ

A08TWJ

Off position

On position

A15

A24

YHJ

854ZK KK1

2

A22

A23YTJ

A17

Tn1

Jn

3

768

2LP

ZK KK2

A20

A11

A09

Tn2

1

6

A07

ZK

HWJ

A21

Remote

controlled

switch-on

Operation circuit

disconnected

Closing output

Manual and

anti-trip

Remote

control

opening

Manual and

trip output

Closed position

output

Trip position

output

Schematic diagram of operating circuit 2

In the diagram, KK1, KK2 and ZK are on the panel, in which KK1 and KK2 are manual

closing and manual trip buttons (the manual closing and manual trip contacts are already

connected to manual close in and manual trip in internally), ZK is a changeover switch for

switching between the local/remote positions, completely replacing the changeover and

operating switches on the board/cabinet panel.

Note: The dotted line outlines the internal circuit of the protection device. When a

control button on the panel is used, Terminal +KM A21 on the panel must be connected to

+KM.

Microcomputer Protection Relays and Monitoring Device for Line Protection

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Transcript of Microcomputer Protection Relays and Monitoring Device for Line Protection