Model Number

LW49-75KV/126KV Outdoor HV AC SF6 Circuit Breaker

Detailed Selling Lead Description

Product overview

LW49-126 Outdoor HV AC Self Extinguishing SF6 Circuit Breaker is used in the electrical system of 3-phase AC 50Hz,110 KV, as its control and protective equipment, and also a connecting circuit breaker for switching loading current, cutting-off fault current and switching over power circuit through various wiring ways in the power plant and substation.

Product standard

This circuit breaker is compliant with GB1984-2003 HV AC Circuit Breaker and IEC 56 HV AC Circuit Breaker .It is insulated and arc-extinguished by SF6, complying with self-extinguishing principle. Working with the spring actuator, it has the following features: powerful breaking capability, long electric life of 20 times, lower active power, and high reliability.

Strong ability of breaking, CB uses self-extinguishing principle, with high breaking and closing ability. Whole annul leak rating<0.02%( O ring uses Sino-America joint company PAK company, the mould and material made in America)

Micro moisture of arc extinguishing chamber <100ppmV/V   

Micro moisture of other chambers <150ppm V/V

Technical parameter

 

Serial no	Item		Unit	Data
1	Rated voltage		KV	75/126
2	Rated frequency		Hz	50
3	Rated current		A	3150
4	Rated short-circuit breaking current		kA	40
5	Rated short-circuit makeup current (peak)		kA	100
6	Rated peak withstand current		kA	100
7	Rated short-time withstand current		kA	40
8	Rated short-circuit duration		s	4
9	Electrical life		times	20
10	Rated power frequency withstand voltage	Over earth, between phases	kV	230
		Between fractures	kV	265
11	Rated lightning pulse withstand voltage	Over earth,between phses	kV	550
		Between fractures	kV	630
12	Rated out-of-step breaking current		kA	10
13	Rated circuit charging breaking current		A	31.5
14	Near-field fault breaking current		kA	36.30
15	Main loop resistance		µΩ	40
16	Mechanical life		times	10000
17	Rated pressure of SF6 (Guage at 20)		Mpa	0.6
18	Alarming purssure of SF6 (Guage at 20)		Mpa	0.55
19	Locking purssure of SF6 (Guage at 20)		Mpa	0.5
20	Creepage distance		mm	3150,3906
21	Rated operation squence			0-0.3s-CO-180s-CO
22	Radio interference level		µ V	500
23	Yearly leakage rate of SF6		%	1%
24	Water content of SF6		Ppm	150
25	Mass of SF6 for each circuit breaker		Kg	10
26	Mass of each circuit breaker		Kg	1800
27	Break-break force (downward)		N	25000
28	Close-brake force (upward)		N	15000