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72.5KV/126/145KV SF6 Circuit breaker(Type: LW49)

72.5KV/126/145KV SF6 Circuit breaker(Type: LW49)
Product Detailed
LW49--126KV and 145KV SF6 CB is used in the electrical system of 3 phase AC 50HZ,110KV, as its control and protective equipment.

 General

1.1 This specification is applicable for LW49-145 outdoor HV AC Auto Expansion SF6 Circuit Breaker, stating the contents of installation, operation and maintenance of circuit breaker, including the safe criterion and risks during the course. Any operator should read this specification carefully before install and operate circuit breaker. He can operate it when being familiar with the related contents. Please contact the manufacturer if you need any question or detailed documents.

Main technical parameters

No.

Item

Unit

Parameter

1

Rated voltage

 

 

 

kV

126/145

2

Rated power-frequency withstand voltage(1min)

Over ground

275

Between fractures

315

Rated lightning impulse withstand voltage

Over ground

650

Between fractures

750

4

Rated frequency

Hz

50

5

Rated current

A

1250,1600,2000,2500,3150

6

First-pole -to-clear coefficient

 

1.5

7

Rated short-circuit breaking current

 

 

kA

40

8

Rated short-circuit makeup current (peak)

100

9

Rated short-time withstand current

40

10

Rated peak withstand current(peak)

100

11

Rated short-circuit duration

s

4

12

Rated out of step breaking current

kA

10

13

Nearby area failure breaking current

kA

36, 30

14

Rated line charge breaking current

A

31.5

15

Rated operation sequence

 

O-0.3s-CO-180s-CO

16

Break-brake time

ms

33±5

17

Close-brake time

80±10

18

Close and break time

ms

≤60

19

Main circuit resistance(between primary outgoing upper and lower)

μΩ

≤40

20

Gas rated pressure of SF6 (20°C gauge pressure) 

MPa

0.6

21

Alarm / closedown pressure(20°Cgauge pressure)

0.55 / 0.50

22

Leak rate of SF6 per year 

%-Y

≤ 0.5

23

Moisture content of gas 

ppm(v/v)

≤150

24

Mechanical life

Times

6000

25

Wireless disturbing level

μV

≤500

26

Mass of charging SF6 gas

kg

10

27

Mass of circuit breaker

1800

72.5KV/126/145KV SF6 Circuit breaker(Type: LW49)



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