LW35-252 Self-energizing SF6 Circuit Breaker

self-energizing arc-extinguished principle and makes full use of the energy and blocking effect of arc itself

1.General Description:LW35-252 self-energizing SF6 circuit breaker, a new generation of high voltag circuit breaker developed by Pinggao independently, adopts advanced self-energizing arc-extinguished principle and makes full use of the energy and blocking effect of arc itself, the diameter of its puffing cylinder is reduced obviously, the operating energy of the circuit breaker is decreased greatly. The circuit breaker is equipped with fully spring operating mechanism, with advantages of advanced design, simple structure, small operating energy, high reliability, low noise, etc.

Each pole of the circuit breaker is of single post and single interrupter, rated short-circuit breaking current up to 50 kA. The technical performance of the circuit breaker has reached the highest level of China.

The circuit breaker is applicable for 220 kV power system, for protection and control of high voltage power transmission and distribution system. It can perform single opening, closing, fast automatic reclosing operation and electric three-pole-gang operation, fully meet the requirement of IEC56, GB1984, DL402 and relevant standards.

2.Main technical Data

No.	Item		Unit	Value
1	Rated voltage		kV	252
2	Rated frequency		Hz	50
3	Rated current		A	3150
4	Rated short-circuit breaking current		kA	40/50
5	Short-line fault breaking current (L90)		kA	36/45
6	Rated short-time withstand current (3s)		kA	40/50
7	Rated peak withstand current		kA	100/125
8	Rated short-circuit making current (peak)		kA	100/125
9	Rated out-of-phase breaking current		kA	10/12.5
10	Rated line charging breaking current		A	125/160
11	Rated SF6 gas pressure (20)		MPa	0.6
12	Resistance of main circuit		μΩ	≤50
13	Rated operating sequence			0-0.3s-CO-180s-CO
14	Mechanical endurance		times	3000
15	Annual leak rate of SF6 gas		%	≤1
16	Moisture content in SF6 gas (V/V)		ppm	≤150 (when leaving the factory)
17	Creeping distance (mm) /Creeping ratio (cm/kV)	Across the breaker		7850/3.1
		To earth		7800/3.1

Remarks: The value at right side of the oblique line is corresponding to rated short-circuit breaking current of 50kA.

LW35-252 Self-energizing SF6 Circuit Breaker