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INSTRUCTION MANUALFOR

MC31ADUAL RATED CT

3 Phase Over Current andEarth Fault Relay

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CONTENTS

Description Page No.

1. Introduction 1

2. General characteristics2.1 Non volatile Memory 1

2.2 Auxiliary Power Supply Range 12.3 Relay outputs 22.4 Starter Relay 2

2.5 CT Ratings 2

2.6 Trip time Characteristic Curves 32.7 Current measurements 3

2.8 Event Recordings 4

2.9 Diagnostics 4

2.10 Signalization 42.11 Reset Time 5

3. Installation & Maintenance3.1 Preliminary checks 6

3.2 Mounting & Wiring 6

3.3 Testing 73.4 Handling Precautions 7

3.5 Fault Detection & Repair 8

3.6 Instructions for Draw-out & Plug-in 8

4. Operation4.1 Push button and Display operation 11

4.2 Menu operations 114.3 Recording of Tripping 12

4.4 Recording of current Values 13

4.5 Display of settings 13

Display of Parameter settingsDisplay of relay configuration

CT ratio settings

Erase the recorded values

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4.6 Programming of the settings 15Programming of the parameter settings

Programming the relay configurations

Erasing the Recorded ValuesProgramming of CT Ratings

4.7 Test 18

5. Technical Specifications 19

6. Wiring Diagram 23

7. Overall Dimensions 24

8. Time current Curves 25

ANNEXURE-1 26Modifications for 2 NO-2 NC type of MC31A

ANNEXURE-2 27Relay Settings Form

ANNEXURE-3 28Secondary current injection test for MC31A

Warranty 29

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1. INTRODUCTION

Over current & Earth fault Relay model MC31A is numerictype, non- directional 3 phase Over current relay. It is suitable

for Over current & Earth fault protection schemes in LV, MV

and HV power distribution systems. It is also suitable for

applications such as providing selective protection for overheadand underground feeders, AC machines, Transformers etc.

Its Micro controller based design offers a wide range of field

selectable Trip time characteristics. It also provides starter andtime delayed programmable outputs for Over Current as well as

Earth Fault.

The relay has a unique provision where by, it can be made

suitable for operation from either a 1A CT secondary or 5A

CT secondary - this CT rating can be selected in the field

through menu operations.

2. GENERAL CHARACTERISTICS

2.1 Non Volatile Memory

The relay has EEPROM, which retains the programmed pickupvalues, characteristics, Trip time settings and recorded

parameters even when the auxiliary supply is switched off.

2.2 Auxiliary Power Supply RangeThe relay has wide range AC/DC auxiliary power supply. There

are two models available.

Type 1: 24V to 110V AC / DC +/- 15 %

Type 2: 95V to 240V AC / DC +/- 15 %

The type of the power supply is highlighted in the wiringdiagram label. Before energizing the relay, check the power

supply voltage is within limits and wiring is done as per the

wiring diagram..2

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2.3 Relay outputs

MC31A relay has 5 relay outputs namely R1 to R5.

Relays R1 to R4 can be configured for any one or more

protection functions. R1 relay can be programmed to operate asself-reset type or manual reset type. R1 relay cannot be assigned

to starter functions. Also, any relay assigned to starter functionscan not be assigned to any other protection.

The relay R5 is meant for providing alarm for internal fault

conditions. It will be always energized during normal operation

and de-energized when the relay is in Program mode or in theevent of auxiliary control supply failure or any malfunction

detected inside the relay.

Note: All the output relays will de-energize when auxiliary

supply is switched off even in hand reset mode. However, the

output relay will regain the original status after the power up

condition when supply is restored.

2.4 Starter Relay

The over current and earth fault function follows the selectedcharacteristic curve for its timing. Except R1 relay, other outputs

can be programmed for instantaneous or time delayed operation

of low set in over current or earth fault mode. When theprotection function is programmed as instantaneous, this output

is useful as an alarm relay or a blocking output to any upstream

over current relay. It should not be associated to trip the

breaker. The breaker trip function has to be achieved by the

time delayed contact of protection function.

2.5 CT Rating

The default setting of the CT rating is 1 Amp (i.e.) P1E1.The CT rating of the unit can be changed in the programming

(ProG) menu and can be viewed in the display setting (dSEt)

menu..3

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The display codes for various CT ratings are:

P5E5 - Phase CT 5 A and Earth CT 5A

P1E1 - Phase CT 1 A and Earth CT 1A

P1E5 - Phase CT 1 A and Earth CT 5A

P5E1 - Phase CT 5 A and Earth CT 1A

Note: After the modifications in the CT ratings, mark the

present CT ratings on the label stuck on the right side of the

unit.

2.6 Trip Time Characteristic Curves

Algorithms for time current curves

Algorithms for different Time current curves are given below:

t(I) = [ A ] * TMS t(I) = Trip time[ (I/Is)a 1 ] I = Fault current

Is = Setting current

TMS = Time Multiplier Setting

Curve Name A a

Normal Inverse 1.3 Sec 0.0613 0.02

Normal Inverse 3 sec 0.1414 0.02Very inverse 13.5 1

Extremely Inverse 80 2

2.7 Current measurements

The relay shows RMS values of three phase & Earth leakage

currents at regular interval on display in scroll mode. (If the

current is more than 9999 A, then relay will display - - - -').

.4

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2.8 Event Recordings

The relay records following parameters.

1. Trip data of last 5 tripping. The Trip data includes Trip

cause (over current lowset, Earth Fault lowset etc.) and overcurrent values when the fault occurred.

2. The number of Tripping due to Over current & Earth fault.

3. The RMS current value measured during Switch-ON of

Feeder and highest current measured during its ONcondition. These values are integrated over a period of 100

millisec.

2.9 Diagnostics

The relay has a built-in watchdog facility, which monitors

correct operation of program flow. During Power-ON a detailed

test is conducted to check EEPROM, RAM & EPROM andother parts of the relay. Additionally, diagnostic routines are

executed continuously to verify memory contents.

Any time of relays normal operation, a test can be initiatedmanually by pressing the Push button. This test has the option of

including or excluding trip relay operations.

Under any fault condition, the relay will show the fault code

Error in the seven-segment display, the Error LED will glow

and relay R5 will de-energize.

2.10 Signalization

The 4 seven-segment displays and 4-phase indicator LEDs show

parameter settings, current values etc. The Trip window at thebottom has 4 LEDs for R, Y, B, E phases. They indicate the

phase on which fault has occurred..5

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These LEDs will start flashing when a fault has developed and

will glow steady when the trip has occurred. The LED indicationcan be reset by a Reset button. However reset is not possible

when fault is present. The Reset button also resets the R1 relay

if it is programmed in Hand reset mode.

2.11 Reset timeThe relay has a unique facility a programmable reset time for

the lowset fault is provided in the relay. If fault current has

appeared for a duration less than the set trip time delay, relay

will hold the elapsed trip time for the duration of theprogrammed reset time. If the relay now senses the fault within

the reset time, it will run the timer only for the remaining

duration and will give the trip time command to the breaker.After issuing the trip command the relay will reset immediately

irrespective of the reset time.

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3. INSTALLATION & MAINTENANCE

3.1 Preliminary checks

Relay packing consists of

1. Relay MC31A

2. Mounting clamps

3. Instruction Manual4. Test certificate

Check the relay for any obvious damage. Please inform nearest

L & T office or dealer in case of any damage. Check the

Auxiliary Supply Range, Current Setting Range and RatedCurrent for which the unit has been configured. This is indicated

on a label fixed to one side of the relay, which also shows

external wiring details. Ensure that these specifications are asper your order.

Remove the protective cover from the terminal block by

removing two screws. Connect suitable auxiliary supply

between terminal 25 and 26. Switch ON the supply, the displayand LEDs all will blink once and the display will show model

number (31A) and Software version (u _.__) of the relay . After

this the relay will enter into current measurement mode.

This completes the preliminary check. Disconnect the auxiliarysupply and fix the protective covers on front panel and terminal

block.

3.2 Mounting and Wiring:

Relay MC31A is designed for flush mounting on the panel.Refer Fig.3 for panel cutout dimensions and space required

behind the panel. Insert the relay through the panel cutout and

hold it firmly against the panel. Fix the mounting clamps on top& bottom side of the relay. Tighten the screws on the mounting

bracket..7

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Wire the relay terminals as shown in the wiring diagram (Refer

Fig.2). Relay terminals are suitable for 2.5 sq mm. lugs. Fix theprotective cover back on the terminal block with the help of two

screws after completing the wiring.

NOTE:

1. ENSURE PROPER EARTH CONNECTION TO THERELAY

2. IT IS RECOMMEDED TO REMOVE THE RELAYFROM THE PANEL DURING TRANSPORTATION.

3.3 Testing

A detailed testing of the relay can be initiated manually by

running the 'TEST' menu. The testing can be done in two ways

as follows.

a) The "diSP" test, which does not trip the output relays.b) The "rly" test, which also trips all the relay outputs.

This test will not trip output relays when current input issensed.

In the event of a relay failure detected during testing, the fault

code will be displayed and "Error" LED will light up. The

internal fault relay R5 will de-energize.

3.4 Handling Precautions

In case of relay malfunction, the electronic module alone can be

removed and replaced without removing the complete relay

assembly with its housing from the panel. Care has to be

exercised while handling the modules. The electroniccomponents can be damaged by electrostatic discharge while

handling the module. Hence care has to be taken while handling

the cards as mentioned in the following page :

.8

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a) Before removing the module ensure that you are at the

same electrostatic potential as the equipment by touchingthe same.

b) Handle the module by its front-plate, frame, or edges of

the printed circuit board. Avoid touching the electronic

components, printed circuits and connectors.

c) Do not pass the module to any person without firstensuring that both of you are at the same potential.

Shaking hands achieves equipotential.

d) Place the module on an antistatic surface, on a

conducting surface, which is at the same potential as

yourself.

e) Store or transport the module in a conductive bag.

3.5 Fault Detection & Repair

Internal settings and components in the relay should not be

altered. For repair please contact nearest L&T sales office.

3.6 Instructions for Draw-out & Plug-in

Refer to the following diagram for relay Draw-out & Plug-in.

The relay has four locking screws. These are normally inlocked position (i.e) the slots in the screws will be vertical.

Draw-out operation:

Rotate the four locking screws by 90 Degrees. Now the screws

will be in unlocked position, that is, the slots in the screws willbe in horizontal position as shown in the diagram.

Hold the label handle by the fingers and pull out the module.

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The relay has CT shorting facility and hence the CT secondary

will be automatically in shorted condition when the module isplugged out.

Plug-in operation:

First ensure the four locking screws are unlocked, by verifying

the screwdriver mark is in horizontal position.

Position the module such that it gets engaged to the card guidesin the housing. Push the module into the connector. Push all four

screws and rotate by 90 degrees. They will get locked to the

housing.

.10

! WARNINGWhile plugging the module, If any of the Locking screws are in

locked position (i.e. the screwdriver mark in the screw isvertical), the module can not be plugged fully. In such a case, The

CT shorting may not have opened. To avoid this problem, ensure

the screws are in unlocked position while pushing the module.

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4. OPERATION

4.1 Push-button and Display operation

Four Push-buttons marked as Select, =, >, Enter, and a

four digit seven segment LED display mounted in the front

panel allow the user to program settings and read the recordeddata. The different commands selected by the keys and data

values are displayed in the seven segment LED display.

The Reset key is used to reset the Trip flag LED indication.

4.2 Menu operations:

The menu is arranged in a tree structure. First, main menu is tobe selected, followed by sub-menus.

After Power-on checks the relay will be continuously displaying

the 3phase current & Earth current values in a scrolling fashion.

To enter into menu, press the Select button. This will select

main menu. The choices in main will appear one after the other

for each = or > button pressings. To select a choice, theEnter button has to be pressed. After this relay will display the

chosen sub menu. The sub menu choices can be selected again,

by operating either = or > buttons.

The Select key also serves as a deselect key for a selectedmenu. Thus, from any sub-menu, to exit to scrolling current

value display, the select key has to be pressed till all the menusget deselected.

The menu structure is explained more in detail in following

pages :

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The main menu is classified into 5 categories as given below:

Choices in Main menu when = key is operated are :

Menu Choice Description

1. d.trP. Display Trip values (Cause & Trip current levels)

2. d.cur. Display maximum current values recorded.3. d.Set. Display relay setting values

4. ProG Program the relay setting values

5. tESt Relay testing mode.

4.3 Recording of Tripping

The relay records tripping causes (Over current / Earth fault) and

values of currents when trip occurred. Last 5 trip recordings arestored at any time. It also records the number of tripping due to

over current and Earth fault in the feeder.

The tripping recordings is selected in the menu for d.trP(Display Trip Values):

L.tr.C Last Trip count values showing number of

trip in Over Current and Earth Fault

(Arranged as type of fault, data,.....)

L.5.tr. Last 5 Trip- data values

(Arranged as Trip number and cause of fault, R,

Y, B & E current values)

In these sub menus, data is viewed by = key operation, the

recorded data will appear sequentially with every = keyoperation.

Note: In last 5 trip, trip no.1 represents latest trip followed bycause. Cause notations are OC. = Over Current lowset

EF. = Earth Fault lowset

(i.e.) 1.OC should be read as Latest trip is due to Over

Current..13

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4.4 Recording of current Values

Recording of Maximum and Starting Current values:

The relay records the current values of the three phase and Earthcurrents during Switch-on of the feeder. Every new Switch-on

value will overwrite on the old values. This current value is an

integrated RMS value of first five current cycles. The highest

current values in a 5 cycle-integration period is displayed.

In addition to displaying this switch on value, the relay records

highest current value occurred during the normal ON period ofthe feeder. These current values will be overwritten only when a

higher current value is measured. A switch-OFF and switch-

ON of the relay will not erase this value.

The recordings of Maximum and Starting current value isselected in the menu for d.cur (Display Maximum current

values).

P.cur (Running max. Current)R; Y; B; E Current Values)

S.cur (Starting maximum current)

R; Y; B; E Current Values)

4.5 Display of settings

Any time when the relay is in operation, the programmed valuesof parameter settings and relay configurations can be viewed.

This menu choice is divided into four categories.

a) Parameter Settings

b) Relay Configurationc) CT Rating

d) Erase the Recorded Values.14

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d)Erase the Recorded Values

Note: The sequence of setting parameters can be viewed without

pressing Select = or > buttons this can be done just bypressing "Enter" push button in particular sub menu of setting.

4.6 Programming of the settings

An example to modify pickup value of over current settings, isdescribed below:

Step1. To enter into program mode, Press select key, followed

by = key twice to get ProGmenu. Now press = key

and > key simultaneously for a while. The Prog/Error LED

will flash indicating the relay has entered into Program mode.The display will show P.SEt.

Step 2. Now press Enter key to get the display of OC..Press Enter key once more, the display will show current

pickup setting.

Step 3. To modify the pickup setting, press either = or >

key to get the desired pickup value.

Step 4. To confirm the selected value, press Enter key .The

display will start flashing. Press Enter key once more. The

new value is registered in the relay as the new setting.

16

Clr ( Clears the trip count value & trip recordings.)Press & keys together till "clr"

display starts flashing and press enter.

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Sub-menu selections in the menu (ProG) for Programming of

relay settings are:

Programming of the parameter settings

P.Set. Parameter programming

OC. 20; 25; 30; 200 (Over current pickup settings)

OC.Ch. nI1.3 Normal Inverse 1.3 sec. Curve;nI 3 Normal Inverse 3 sec. Curve ;

vI Very Inverse curve ;

EI Extremely Inverse curve;

d.1 Definite time 1 sec.;d.10 Definite time 10sec.;

d.100 Definite time 100 sec.

(Overcurrent curve selections)OC.tS. 0.1; 0.15; 0.2; ...1.6 (Time multiplier selection)

EF. 5; 10; 15; 20...80 (Earth fault pickup setting)

EF.Ch. nI1.3; nI 3; vI; EI; d.1;d.10; d.100

(Earth faultCurve selections)EF.tS. 0.1; 0.15; 0.2;....1.6

(Earth fault Time multiplier selection)

t.rS t 0.1; 0.2 ;0.3; 0.4 ; ;10 or Dis(Reset time)

Ph.Ct Primary phase CT ratio value. Range 0001 to

9999 (E.g. For CT ratio of 100/5 value to beentered is 20)

EF.Ct CBCT or primary Phase CT ratio value.

Range 0001 to 9999

(= Key is to set number > Key is to move to nextdigit)

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Programming the relay configurations

rly Relay output configuration

OC.St. (Relay output for over current starter)

OC. ( Trip relay for time delayed over current)

EF.St. ( Relay output for Earth fault starter)EF. ( Trip relay for time delayed Earth fault)

(= key is to select or deselect relay. Here

1,2,3,4 represent R1, R2, R3, and R4. > key isto move to next relay )

1.rES S / H (Self or Hand reset for Relay 1)

Erase the Recorded Values

Changing the CT rating

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Clr ( Clears the trip count value & trip recordings.)

Press ==== or >>>> keys together till "clr" display starts

flashing and press Enter.

CT For changing the internal CT rating of the relay, hold

= ,>and Enterpush buttons together till theCt display starts blinking. Then press Enter button

to enter the Ct rating menu . Select the required CTrating and press Enter two times to register theselection . A conF message is displayed which

confirms the configuration change

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4.7 Test

Sub-menu selections for the menu( tESt ) Relay testing

diSP ( Testing without energizing output relays)rly (Testing including output relays)

If current value is sensed this menu will not

energize output relays.

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11) Insulation : 2 kV AC. RMS, 50 Hz for one

minute across independent circuit

as per IS 3231 : 1987.

1 kV AC RMS, 50 Hz for one

minute across open contacts as

per IS 3231:1987

12) Impulse Withstand : 5kV peak , 1.2/ 50 micro sec.asper IS 8686 :1977

13) High freq. disturbance : 1MHz, 1.0kV peak across input

circuit and 1MHz, 2.5kV peak

between independent circuits as

per IS 8686 :1977.

14) Surge Immunity :As per IEC1000-4-5 Level 4

4 kV (CM), 2kV (DM)

15) Electric Fast Transient : As per IEC1000-4-4 Level 3,

2kV,5KHz

16) Ring Wave : As per IEC1000-4-12 Level 44kV (CM), 2kV (DM)

17) Electro Static Discharge : As per IEC1000-4-2 , 15kV

18) Immunity to voltage : As per IEC 1000-4-11

variations,dips and

short interrupts19) Immunity to Radiated : As per IEC1000-4-3 level 3

electromagnetic field 80 - 1000MHz,10V/m

20) Power frequency : IEC 1000-4-8:1000A/m

magnetic field

21) Resistance to vibration : AS per IS 3231

and shocks

22) TemperatureOperating Temperature : 0

oC to 60oC

Storage Temperature : -20oC to 70

oC

22

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23) Case : DIN Standard, Panel mounting

Front bezel : 158 x136 mm.

Panel Cutout : 142 x 113 mm

Depth : 204 mm.

24)Weight : Approx. 1.5 Kg.

Information required at the time of order :

Aux. power supply range : Type 1: 24V to 110V AC / DC

or

Type 2: 95V to 240V AC / DC

..23

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6. WIRING DIAGRAM

Fig. 2

..24

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Fig. 3

.25

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Time - Current Characteristics( At TMS=1 )

For Trip time at TMS other than 1

Trip time = ( Trip time at TMS=1 ) x TMS OR 50msec whichever is more

Multiple of set current (Is)

A: Normal Inverse 3.0 Sec B: Normal Inverse 1.3 SecC: Very Inverse D: Extreme Inverse

26

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ANNEXURE-1

Modification for 2NO 2 NC type of MC31A

On special request MC31A relay can be supplied where the

relay will have 2 N/O + 2 N/C contacts ( instead of 4 N/O)

The 2 NO-2 NC type of MC31A has only three output relays .One among the three , ( R5) is used for indicating the internal

fault condition. The other two relays R1 and R3 have one NOoutput and one NC output. Both the relays can be set in either

Hand reset mode or self-reset mode. Programming of these

relays is not possibleas both trip when the fault occurs (eitherEarth fault or Over current) . Below given modification helps to

set the relays in hand or self-reset mode.

Settings:Programming of the Settings:

Display Setting:

Display of relay configuration:

27

rly : Relay output configuration

RES :S/H ( self or hand reset of Relay 1 and relay 3)

Rly : Relay configuration

rES :Reset mode for R1 & R3 relay( Self/ handreset)

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ANNEXURE-2

MC31A RELAY SETTING FORM

DATE RELAY NUMBER

PARAMETER SETTINGS

DEFAULT SETTING ACTUAL SETTING

SETTINGS VALUE UNIT SETTINGS VALUE UNIT

OC. 100 % OC. %

OC.Ch. nI 1.3 --- OC.Ch. ---

OC.tS. 1.0 Multip

les

OC.tS. multipl

es

EF. 20 % EF. %

EF.Ch. nI 1.3 --- EF.Ch. ---

EF.tS. 1.0 Multip

les

EF.tS. multipl

es

t.rS t Dis t.rS t

Ph.Ct. 100 CT

ratio

Ph.Ct.

EF.Ct. 100 CT

ratio

EF.Ct.

28

RELAY CONFIGURATION

DEFAULT SETTING ACTUAL SETTING

SETTINGS VALUE UNIT SETTINGS VALUE UNIT

OC.St. - - - - OC.St.

OC. 1 - - - OC.

EF.St. - - - - EF.St.EF. 1 - - - EF.

1.rES. SELF 1.rES.

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ANNEXURE-3

SECONDARY CURRENT INJECTION TEST

FOR MC31A:

Test Equipment: Single phase Current injection set

Connections: Connect auxiliary supply between terminal 25

and 26 (as indicated in wiring diagram). Connect terminals

1,2,3,4,5,6,7 and 8 in series so that same current will pass

through all the 4 CTs.

Power on: Switch ON the supply, the display and LEDs will

blink once and the display will show model number (31A), "

Software version (u _.__) in the relay . After this the relay willenter into current measurement mode.

Display & earth fault trip test: Ensure the relay settings

are as per Default settings given in the setting form. Pass 2A(0.4A for 1A relay) through the relay. Now the relay will startdisplaying the current in scrolling mode. Same time earth fault

trip led will start flashing and will become permanently ON

after 4.39 sec.

Over current trip test: Pass 10A(2A for 1A relay)through the relay. Now all the phase trip LEDs will start

flashing indicating the presence of fault. This will continue up to

4.39 sec and later all the trip LEDs will become permanentlyON and relay R1 will trip. Check the continuity between the

terminals 9 and 10 to ensure tripping of R1. Remove the currentand press "reset" button to reset the relay. Now LEDs willbecome OFF.

This completes the secondary current injection test. Disconnect

auxiliary supply and other CT connections. Fix the protective

covers back on front panel and terminal block...29

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WARRANTY

LARSEN & TOUBRO LIMITED ( L&T) warrants that the

protective Relay model MC31A will meet L&T s publishedspecifications and will be free from defects in workmanship and

materials for a period of 12 months from the date of shipment.L&Ts obligation under this warranty shall be limited toservicing or replacing the defective parts provided that notice of

such defects and satisfactory proof thereof is given to L&T by

its customer within the warranty period.This warranty does not cover any defect caused by accident,

misuse, neglect alteration, modification or substitution of any of

the components or parts or any attempts at internal adjustment

by unauthorized service personnel.Under no circumstances shall L&T be liable for any

consequential damage, resulting injury, loss or expense, directly

or indirectly, arising from the use of this product.The foregoing warranty is in lieu of all other warranties

expressed or implied and is the sole and exclusive remedy for

any claim arising from the defect in the product.

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Manufactured by

LARSEN & TOUBRO LIMITED,

KIADB INDUSTRIAL AREA,

HEBBAL, HOOTAGALLY,

MYSORE 570 018.

INDIA.

Visit us @ www.lntmps.com

www.lntebg.com

www.larsentoubro.com

Reach us @ mpsinfo@myw.ltindia.com

Part No. 4D060082 Rev. 5