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72.5kV 3150A 31.5kA Dead Tank SF6 Gas Circuit Breaker with Tripolar Operating Mechanism
42.5kV SF6 CIRCUIT BREAKER
Type LW24- /T outdoor H.V. A.C. dead tank SF6 gas circuit breaker is a new kind of circuit breaker with self-blast interrupter and spring operating mechanism,on the basis of technology of product imported from Mitsubishi, Japan.The latest achieve-arc extinguishing principle of gas-blast pressure adapting with breaking-current is employed,by which most of energy required for breaking rated short-circuit current are acquired from arc itself.Therefore, the demand for operating power is reduced significantly. The three pole interrupters are placed inside three metal enclosures respectively. The circuit breaker can be mechanically three-phase gang-operated. Both remote electrical control and local manual control can be realized.
Type CT20-II spring operating mechanism, provided with the product, is a kind of mechanism with low operating power, minimum maintenance work needed and high reliability. The product reaches international advanced level in the respect of main technical performance.
Product Detail
Altitude:≤3000m
Humidity monthly:≤90%
Max .wind velocity:≤35m/s
Pollution class:IV class
Ambient air temperature:-35ºC~40ºC(It's satisfied under condition of -40ºC in heavy cold area)
Max .temperature difference daily: 25K
Earthquake withstand density:9 degree
Ice coating: ≤10mm
Max. radiance from sun: 1000 W/m2
|
Name |
Unit |
Parameters |
Parameters |
|
Product type |
/ |
LW24-72.5 |
LW24-72.5 |
|
Name of breaks |
set |
1 |
1 |
|
Rated voltage |
kV |
72.5 |
72.5 |
|
Rated frequency |
Hz |
50 |
50 |
|
Rated current |
A |
4000 |
2500 |
|
Main circuit resistance |
μΩ |
≤150 |
≤150 |
|
Temperature rise test current |
A |
1.1lr |
1.1lr |
|
1min power frequency withstand voltage Across open breaks |
kV |
160+42 |
160+42 |
|
1min power frequency withstand voltage To earth |
kV |
160 |
160 |
|
Lightning impulse withstand voltage (1.2/50μs) Across open breaks |
kV |
350+59 |
350+59 |
|
Lightning impulse withstand voltage (1.2/50μs) To earth |
kV |
350 |
350 |
|
Rated short circuit breaking current AC component effective value |
kA |
31.5 |
31.5 |
|
Rated short circuit breaking current Time constant |
ms |
45 |
45 |
|
Rated short circuit breaking current Breaking times |
Times |
≥12 |
≥12 |
|
Rated short circuit breaking current Prime minister’s breaking coefficient |
/ |
1.5 |
1.5 |
The breaker or interrupter unit i.e. fixed and moving contacts, arc quenching medium (SF6 gas) etc. is placed inside a metal tank. This metal tank is earthed so this type of breaker is called dead tank or earthed tank circuit breaker.
There are circular shaped or toroidal current transforms inside the bushing. The dead tank circuit breaker comes with ot without these Current transformers . These CTs can be used as protection CTs.
Kindly note that vaccum circuit breaker also comes in live tank and dead tank design.
Use, advantages and disadvantages of live tank and dead tank circuit breaker
Live tank circuit breakers is filled with very much less SF6 gas as compared to dead tank circuit breaker. Dead tank circuit breaker require too much sf6 gas as compared to live tank circuit breaker as the interrupter are in a large metal chamber so to provide necessary insulation. As SF6 gas is green house gas(gas causes global warming). Live tank design is so environment friendly.
Dead tank circuit breaker, there are chances of fault between interrupter contacts and metal tank so require current transformers in the bushing to provide fast acting protection in case of fault within circuit breaker.
Dead tank circuit breaker is less prone to earthquakes as compared to live tank.
PELATED PRODUCTS
Safety protection // Fine workmanship // Easy to install // Long life // Provide custom
>> Why choose us
Lawrence Electric Co., Ltd. is a high-tech enterprise focusing on power transmission and distribution products, providing customers with one-stop service of power transmission and distribution products.
It mainly produces and sells lightning arrester, insulator, fuse, isolation / load switch, SF6 / vacuum circuit breaker, power supply fittings, optical cable fittings, switch cabinet and other transmission and distribution products. The company has production bases and sales centers in Jiangxi, Zhejiang, Uganda, Tanzania and other places.
Our products have operated safely in the power supply systems of more than 20 countries and regions around the world for more than 10 years. They are also qualified suppliers of China State Grid and China Southern Power Grid. At present, they have gained a good reputation in the field of power system in the world.
We have received high-quality product recommendation letters from power supply companies in Kenya, Uganda, Tanzania, Zambia, Guinea, Ghana, Togo, Mozambique, Nepal, Guyana, Myanmar and other countries and regions.
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