Live Tank Circuit Breaker is a new type product .This new product has been researched and developed by us ourselves according to the customer's demand. The product was verified by the Common Organization of China Association of Mechanical Industries with China Electrical power corp. in July,2002 and the certificate had been passed through our National Grade. The result gives out that the product is a small-scale type of compact construction and minimum dimension. This small-scale type takes the lead in manufacturing it in the same electrical industry of our country. It is equipped with a hydraulic operating mechanism, providing a new kind of product to the customers at home and abroad

◆ Having the great ability of interrupting fault current:

This type circuit breaker is designed as a small-scale single-puffer blast interrupter and making from special nozzle, having high air blast effect and vigorous arc extinction capability. The circuit breaker can interrupt the short circuit current of 50kA with single break without parallel capacitor. The tests were severely examined. The short circuit breaking test at the end of the outgoing is successfully past under the conditions of the first pole factor 1.5 and the first pole factors 1.5 and 1.3 included within the arcing area. It can also be subjected to continously breaking rated short circuit current 27 times without maintenance
◆ Good current flowing capability through the circuit breaker :

The circuit breaker is designed to the spiral spring contact finger and self-auto contact. It is simple construction and minimum volume. The electric field well distributed around the contact. It is more contactors, good conductivity, high stable short time withstand current and peak withstand current and reliable operation. The temperature rise test is passed at rated current of 1.2 time.
◆ Good properties of the operating mechanism :

A new design hydraulic operating mechanism is a analogy model structure. It is minimum volume, compactness structure, good seals, easy maintenance, stable performance and reliable operation

Rated voltage

kV

252

Rated current

A

4000

Rated frequency

Hz

50

Rated short circuit switching current

kA

50

Rated SF6 gas pressure ( at 20 ℃ gauge pressure )

MPa

0.5

Rated dielectric level

1min power freq.withstand voltage test kV

To earth and between poles

460

Between break

460+145

Lightning impulse withstand voltage test ( peak )kV

To earth and between poles

1050

Between break

1050+200