LW34B-40.5 Series Outdoor High Voltage SF6 Circuit Breaker

It is designed for control and protect large and mediumized power station, substation and industrial and mining enterprises. It

1.General Description:

  Latest design, simple structure, small occupying area, easy erection , low noise, high reliability, high energy-storing efficiency (energy storing time is not more than 15s), applicable for various environment.

 The interrupter makes use of the principle to extinguish the arc by the energy itself, takes the structure of small-diameter puffing cylinder, variable clearing distance and double-direction blast, which increases the pressure of SF6 gas in puffing cylinder by making use of block effect of arc to extinguish the arc.The circuit breaker is operated by full spring mechanism, structure is impact, connection between the mechanism and circuit breaker itself is easy, mechanical properties of the circuit breaker is determined by designed structure, adjustment is not necessary on site.

 The transmission between poles is through double pull rods, which reduces the impact to the interrupter, and increases the service stability of circuit breaker.

The wiring terminal is arranged as the shape of , which make the connection of incoming and outgoing line is very flexible.

Due to optimized design and high insulating level, the interrupter takes lower SF6 operating pressure when breaking identical short-circuit current, and makes ambient temperature for the circuit breaker reach to -40~+40.Technical data:

2.Main technical Data

Item		Unit	LW35-72.5	LW35-126
Rated voltage		kV	72.5	126
Rated frequency		Hz	50
Rated current		A	3150
Rated short-circuit breaking current		kA	31.5	40
Short-line fault breaking current		kA	28.5	30/36
Rated short-time withstand current (3s)		kA	40
Rated peak withstand current		kA	100
Rated out-of-phase breaking current		kA	8	10
Rated line charging breaking current		A	10	31.5
Rated SF6 gas pressure (at 20)		MPa	0.4	0.5
Resistance of main circuit		μΩ	≤40	≤45
Rated operating sequence			O-0.3s-CO-180s-CO
Mechanical endurance		time	3000
Annual leakage rate of SF6 gas		%	≤1
Moisture content in SF6 gas (V/V)		ppm	≤150 (when leave the factory)
Creeping distance (mm) /creeping ratio (cm/kV)	Across the breaker		2300/3.1	3950/3.1
	To earth		2300/3.1	3950/3.1

LW34B-40.5 Series Outdoor High Voltage SF6 Circuit Breaker