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Skype: liujingmec
liujing@mec.com.cn
LW35-72.5/126/145/252 SF6 circuit breaker is designed with self-energizing theory that the arc generated in the interrupter is distinguished at a specified time with a part of energy from the arc itself.
The circuit breaker is designed and manufactured in good accordance with IEC standards.
LW35-72.5/126/145 circuit breaker is either three-phase gang operation with a spring mechanism or single-phase operation with three spring mechanisms.
LW35-252 series circuit breaker is equipped with three spring mechanisms to realize single-phase operation or three-phase electrical gang operation.
1. Simple structure, high rated parameter
2. Spring mechanism, compactness
3. Easy installation, low noise, high reliability
4. Double sealing system is adopted to guarantee minimum SF6 annual leakage
5. Mechanical and electrical anti-pumping function.
6. Reasonable design, compact structure, no oil-leakage, maintenance-free, 10000 times mechanical endurance.
|
Item
|
Unit
|
LW35-72.5
|
LW35-126
|
LW35-145
|
LW35-252
|
|
Rated voltage
|
KV
|
72.5
|
126
|
145
|
252
|
|
Rated current
|
A
|
3150
|
4000
|
|
Rated frequency
|
Hz
|
50
|
|
Rated short circuit breaking current
|
kA
|
40
|
50
|
|
Rated short time withstand current (3s)
|
kA
|
40
|
50
|
|
Short line fault breaking current
|
kA
|
30/36
|
45/37.5
|
|
Rated peak withstand current
|
kA
|
100
|
125
|
|
Rated out-of-phase breaking current
|
kA
|
10
|
12.5
|
|
Rated line charging breaking current
|
A
|
10
|
31.5
|
50
|
160
|
|
Rated SF6 gas pressure (at 20℃)
|
Mpa
|
0.4
|
0.5
|
0.6
|
|
Main loop resistance
|
μΩ
|
≤40
|
≤45
|
≤60
|
|
Operation sequence
|
|
O-0.3s-CO-180s-CO or O-0.3s-CO-15s-CO
|
|
Mechanical endurance
|
Times
|
10000
|
|
SF6 gas leakage（rate per year）
|
%
|
≤1%
|
|
Moisture content (V/V)
|
PPm
|
150
|
|
Creepage
|
Across the open contacts
|
mm
|
2300
|
3950
|
3950
|
9400
|
|
To earth
|
mm
|
2300
|
3950
|
3950
|
7320
|
LW10B column type SF6 circuit breaker including 252kV, 363kV and 550kV products, are used for making and breaking normal current, fault current and changing over of circuit, so as to realize the control and protection of power system. Please contact us! Email: liujing@mec.com.cn
Liaoning MEC Group Co., Ltd. is located in China’s famous coastal Dalian city. The company is a comprehensive group, the business scope includes international project contracting, international trade and domestic trade, environmental engineering, e-commerce, real estate and property management, warehousing and logistics , and investment.
The group company was founded in 1994. Up to now, the average annual turnover is around 2.2 billion yuans, of which, the volume of import and export amounts for more than USD 250 millions. The company keeps business relations with several thousand firms and enterprises home and abroad.
All along with the development during the past twenty years, we never forget our responsibilities to the society. The company is persistent in providing supports to the public welfares, its year in year out public donation activities have won broadly recognitions from the social communities as well as governmental authorities.
We adhere, with the company’s good HR resources and scientific management models, the ideas of advance decision making, moderate operation, prudent management, sustainable development, and abide by the core values of being realistic, to create and to share. We do our best to provide our customers with added service.
