●Brief Description
LW35 serial circuit breakers, including LW35-72.5, LW35-126, LW35-145 and LW35-252 products, are designed with self-energizing principle that arc generated in the interrupter is distinguished at a specified time with a part of energy produced by the arc itself. They are used for making and breaking normal current, fault current and switching lines to realize the operation (three-pole opening&closing operation and fast automatic-reclosing operation), control and protection of power system.
●Main Features
1 Less consumption of SF6 gas, benefitial for environmental protection. When other kinds of circuit breaker at 0.6 MPa must be filled with SF6 of 27 kg/set, this kind of circuit breaker only need 19.3 kg/set.
2 Dynamic sealing system adopts advanced Glyd ring and Step seal to reduce starting friction and prevent leakage.
3 Adopt imported control valve of stable performance and anti-slow-opening function in case of pressure loss.
4 Two sets of independent opening control circuit are adopted in hydraulic mechanism with two sets of relay protection to enhance service reliability.
●Technical Parameters
Specifications
|
Unit
|
Value
|
Rated voltage
|
kV
|
72.5
|
126
|
145
|
252
|
Rated current
|
A
|
3150/4000
|
Rated frequency
|
Hz
|
50/60
|
Rated short-time withstand current (r.m.s)
|
kA
|
50
|
Rated peak withstand current
|
kA
|
125
|
1 min power frequency withstand voltage (r.m.s)
|
To earth/Between phases
|
kV
|
140
|
230
|
275
|
460
|
Across isolating distance
|
kV
|
160
|
300
|
315
|
460 +(145)
|
Lightning impulse withstand voltage (peak)
|
To earth/Between phases
|
kV
|
325
|
550
|
650
|
1050
|
Across isolating distance
|
kV
|
375
|
650
|
750
|
1050 +(200)
|
Rated SF6 gas pressure(20℃)
|
MPa
|
0.5
|
0.5
|
0.5
|
0.6
|
Rated SF6 annual leakage
|
%
|
≤0.5
|