Three-Phase Electronic SECTIONALISER - Shenyang Chenxing Electric Co.ltd

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Three-Phase Electronic SECTIONALISER

Date2013-8-30 9:16:30 Views188Num

OVERVIEW

The sectionalizer is applied in three phase power system with AC 50Hz and rated voltage 10-40.5kV. It is installed on

distribution overhead line to isolate fault when corporate with recloser or circuit breaker. When fault occurs on the
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line, the faults current reaches or exceed preset threshold value, the sectionalizer can memorize the tripping times of

upstream recloser. When it reaches preset times, it drops down to trip automatically

Sectionaliser will drop down to trip automatically on the condition as given below:

First, the faults current exceeds presetting pickup current. Next, the counting time reaches presetting value (1, 2,

3 or 4). Third, the circuit loses voltage and the current is lower than 300mA. And then the Sectionlizer will trip

automatically when the aforesaid conditions occur simultaneously. If any of aforesaid conditions doesnt occur, the

Sectionlaizer will not trip automatically.

This sectionalizer uses micro-computer and operating trip mechanism and does not require external auxiliary supply.

ENVIRONMENTAL CONDITION

a) Ambient temperature:-40 - +60

b) Altitude:3000m

c) Wind pressure: not more than 700Pa

TECHNICAL DATA

S/Nname unit

FDK10-

12/D315FDK-12/D200 FDK-40.5/D200

1 Rated voltage KV 12 12 40.5

2 Rated current A 315 200 200

3 Rated frequency Hz 50 50 50

4 Pickup current rating A 8~500A 8~400A 8~400A

5 Short time withstand

current(RMS)

KA 10 10 10

6 Short circuit withstand time s 4 1 1

7Short time withstand current

(PEAK)KA 25 16 20

8 Counting time time 1, 2, 3 1, 2, 3,4 1, 2, 3,4

9 Max memory time S 15 20 20

10 Max reset time S 30 20 20

11Permissible deviation of pick up

current for memory rest time

% 10 10 10

12 Opening time ms 180 200 200

13 Main circuit resistance 300 400 400

14 Mechanic life Time 500 500 500

15Horizontal pulling force of

terminalN 250 250 250

16 Manual open moment Nm 4

17 Manual open force N 120 120

18 BIL(phase to ground) KV 75 110 185

19 BIL(between gap) KV 85 110 220

20PFWV

(phase to ground)

dryKV

42 55 95

wet 30 45 80

21PFWV

(between gap)

dryKV

48 55 110

wet 34 45 95

22 PFWV of control circuit KV 2 2 2

23 Dirty proof grade Class

24 Ice proof thickness mm 7 1 1

25Pickup current (four classes) and

Counting time can be set YES YES

26

Mechanical interlocking for 3

phase devices and automatic YES YES


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reset

MAIN STRUCTURE AND OPERATION PRINCIPLE

MAIN STRUCTURE

The sectionalizer is single phase high voltage equipment. It consists of insulator, contact, conductive rod parts

working as primary system. The secondary part consists of CT and electronic controller and so on. Release action

system consists of trip mechanism, detent and so on.

The conductive rod is used as the core component of sectionalizer assuming electrical control and body movements,

mainly is composed of a movable contact, a conductive tube, current transformer, control panel, a tripping

mechanism, a reset mechanism, lower moving contact

Conductive tube manufacturing into a lot of new and high technology, which has the advantages of compact

structure, high control accuracy, stability is strong, other products can not be compared. The starting current

accuracy is 10%, the protective index to IP65 above, its mechanical life can be far higher than the national

standards for 500 times, can reach 1500 times.

FDK-12/D200-10 Sec tionalizer can trip by the agency of outdoor portable load operating tools.

2

OPERATION PRINCIPLE


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The current transformer built in the cutout sectionalizer can detect the current of the main circuit and send the

output to the electronic control for digital handling. When a fault occurs, the upstream recloser (or circuit breaker)

opens, the circuit loses voltage and the current is lower than 300mA, the electronic controller can remember this

opening time as a count. As it accumulate the presetting number (1 to 4), the sectionalizer will automatic trips

within 180ms of fault interruption to isolate fault. Then the upstream recloser (or circuit breaker) closes to restore

power supply to the healthy sec tion of the sys tem to limit outage scope and protect the main feeder in service. I f the

fault is temporary and is cleared before the sectionalizer counter reaches the presetting number, the sectionalizer

remains closed and resets to its original state after its reset time expires.The current transformer built in the cutout

sectionalizer can detect the current of the main circuit and send the output to the electronic control for digital

handling. When a fault occurs, the upstream recloser (or circuit breaker) opens, the circuit loses voltage and the

current is lower than 300mA, the electronic controller can remember this opening time as a count. As it

accumulate the presetting number (1 to 4), the sectionalizer will automatic trips within 180ms of fault interruption to

isolate fault. Then the upstream recloser (or circuit breaker) closes to restore power supply to the healthy section of

the system to limit outage scope and protect the main feeder in service. If the fault is temporary and is cleared

before the sectionalizer counter reaches the presetting number, the sectionalizer remains closed and resets to its

original state after its reset time expires.

This segmenter starting current and counting times according to user pre-selected specifications in the factory has

been completed debugging, but each segment is provided with four kinds of starting current and 1 to 4 counting

times for site temporary adjustment, adjustment of the specific ways: first to unload the conducting pole with sixangle wrench to unload the screw " on the moving contact, remove the " visible red dial switch, its upper end has

four white toggle torsion, of which 1, 2 toggle torsional adjustment start current, 3, 4, the adjusting counting

number. The different combinations can have different rated current and starting counting number.

MAIN TECHNICAL SPECIALITIES

Easy installation just like drop down fuse, reliable operation.

To discriminate a permanent fault from a temporary fault.

Isolates temporary faults preventing extensive outages

It can isolate fault line automatically to ensure healthy line operating normally.

It has obvious visible opening point after dropping down and can help to find out fault point easily.

No protection dead area.

Rot proof, reliable operation for all-weather, all metal parts are made from copper and stainless steel.

Cost performance ratio is high.

Maintenance f ree.

APPLICATION

Normally, the sectionalizer is applied in conjunction with an upstream recloser or circuit breaker. Refer to the

diagram

For Example:

The recloser applied in the substation is set( 1 fast and 2 slower)3 shots to lockout and 6 units cutout

sectionalizers (F1, F2, F3, F4, F5, F6) are applied in the four branch line to separate 7 section ( L1, L2, L3, L4, L5,

L6, L7). The counts of F1 is set to 3 time, F2, F3, F5, are set to 2 times and F4, F6 are set to 1 times.

If there is a fault E1 in section L5, a fault current flow the recloser and sectionalizer F1, F3, F4, The recloser trip


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,

fault section L5, the rescloser reclose and restore the healthy section L1, L2, L3, L4, L6, L7 to service.

If a fault E2 in section L6, a fault current flow the recloser and sectionalizer F1, F5, the recloser trip; if the fault is

temporary, the recloser reclose to restore the line in service, then the sectionalizer F1, F5 remains closed and resets

to its original state after a presetting time since it does not reach the presetting count number,. if the fault is

permanent, the r ecloser fail to reclose successfully and trip again, all the line lost voltage and the sectionalizer F5 trip

to isolate fault section L6 after it reaches the presetting count number 3, the sectionalizer F1 remain closes state

since it does not reach the presetting count number. The recloser reclose again and restore the healthy section L1,

L2, L3, L4, L5, to service.


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If a fault E3 in section L2, a fault current flow the recloser and sectionalizer F1, the recloser trip. If the fault is

temporary the recloser reclose to restore the line in service, then the sectionalizer F1 remains closed and resets to its

orginal state after a presetting time since it does not reach the presetting count number. If the fault is permanent , the

recloser fail to reclose successfully and trip again all the line lost voltage and the sectionalizer F1 trip to isolate fault

section L2 after it reach the presetting count number 3, The recloser reclose again and restore the healthy section L1

to service.

The count number of sectionalizer is set 1 time normally as it applied in the end of substation because almost fault

occurring at the end of substation is permanent and is set 2 or 3 times applied on the overhead line because almost

fault applied on the overhead line is temporary.

In this co-ordination, the sectionalizer can easily and optimized co-ordinate.

ODRDER KNOWLEDGE

The Catalog Number System:

For example, the pickup current of sectionalizer has four classes and

three specifications, the counting time can

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Three-Phase Electronic SECTIONALISER - Shenyang Chenxing Electric Co.ltd

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