800kva diesel generator,800kva diesel generator engine set for sale

Since the early 1940s, along with industry, to improve the manufacturing level and the increasing demand for electricity, manufacturing large capacity generator sets not only possible, but also a requirement to meet the electricity demand. With the generator unit capacity of increasing short-circuit current causes the rapid increase, so that ordinary medium-voltage switchgear breaking capacity can not meet the requirements, and in order to improve safety and reliability, resulting from the rapid development phase enclosed bus and a generator transformer unit wiring widely adopted. To the mid-1960s, in order to simplify the operation of the power plant operation, and the need to improve the availability of nuclear power technology unit, a growing number of experts believe that the use of the generator breaker is necessary. It is this need led to the BBC the company developed the first DR type air circuit breaker in a large generator terminal direct operations in 1969. The circuit breaker is off-phase fully enclosed structure, with compressed air as the arc extinguishing medium, also uses compressed air actuator, rated current up to 50000A, breaking capacity of 250kA, which rated current of the circuit breaker 11000A less use of natural wind cold, 11000 ~ 20000A uses forced air cooling circulation, 20000 ~ 50000A was cooled. DR from the first circuit breaker put into operation so far, BBC / ABB produced a total of about 600 units on the market, the failure rate is gradually reduced to about 0.5%, and stabilized. Operating failure rate is 20 × 10-6, equivalent to 50,000 times the operation a failure occurs, this indicator higher pressure about 20 times lower breaker. In 1984 ABB introduced the first HE type SF6 generator circuit breaker, using SF6 gas as the arc medium, remains pneumatic actuator. It uses SF6 gas self-extinguishing (Selt-extinguishing) principle, separated by an arc generated when the contacts SF6 gas is heated, it expands to form the required extinguishing gas while current flows through the coil within the fixed contacts magnetic field, causing an arc of rotation, so that the pair of contacts of the burn is reduced to a minimum

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