SF6 Circuit Breaker LW-126KV 132KV 145KV Outdoor Types 3 Phase 3 Poles for Electrical Power Supply Equipment Usage

1.Description of SF6 Circuit Breaker LW-126kv 132kv 145kv Outdoor Types

Lw-126kv circuit breaker which is outdoor type finds its universal range of applications for the electrical system with elevation not greater than 2000m,ambient temperature not lower than -30℃,dirtiness grade not high than IV, alternating current 50Hz and the maximum voltage 126kV. It is used for cutting the rated current, malfunction current or switching the circuitry, to control and protect the electrical system ,and it can also be used for connecting with the circuit breaker.

The gas of the SF6 is employed as the arc-extinguishing medium and the dielectric material. The self-extinction technology and the new-type spring operating mechanism are introduced in the SF6 circuit breaker. Thus the circuit breaker has good qualities with long electrical life, low operation power, lower noise, high reliability, simple structure, small and long overhaul periods. It can fully replace the same type one.

2. Data list

No	Name			Unit	Value
1	Rated voltage			kV	252
2	Rated power frequency withstand voltage (1min)		To earth		460
2	Rated power frequency withstand voltage (1min)		Between interrupter		460+146
3	Rated thunder impulse withstand voltage		To earth		1050
3	Rated thunder impulse withstand voltage		Between interrupter		1050+206
4	Rated frequency			Hz	50
5	Rated current			A	4000
6	Amplitude factor				1.3
7	Rated short-circuit breaking current			kA	50
8	Rated short-circuit making current(peak)			kA	125
9	Rated current withstand current			kA	50
10	Rated peak value withstand value			kA	125
11	Rated short-circuit duration			s	3
12	Rated out-of-phase breaking current			kA	12.5
13	Breaking current of close-in fault			kA	90%lk,75%lk
14	Rated line-charging breaking current			A	200
15	Operating sequence				O-0.3s-CO-180s-CO
16	Resistance other main circuit			μΩ	≤55
17	Rated gauge pressure of SF6(20℃)			Mpa	0.6
18	Minimum functional gauge pressure(20℃)			Mpa	0.550.015/0.50.015
19	Annual leakage rate of SF6				≤0.5%
20	Amount of water of SF6(V/V)			ppm	≤150
21	Mechanical life			times	6000
22	Electrical level of radio interference			μV	<500
23	Creepage distance	To earth		mm	≥8660
23	Creepage distance	Between interrupter		mm	≥6900
24	Weight of the SF6			kg	24
25	Weight of the circuit breaker			kg	1500

3. working Conditon

Surrounding air temperature: -40 ºC ~+40 ºC ;
The wind speed is not bigger than 34m/s;
The air filthy should be with in III degreealtitude above sea level does not over 2,000 meters;
Installing places: Not flammable, the explosion hazard, chemistry corrode place;

4.Technical diagram