What Is Diesel Generator Circuit Breaker
by Starlight Generator dieselgeneratortechDiesel generator
automatic air circuit breaker is a low-voltage automatic switching device,
which is usually used in circuits with AC voltage below 500V. In normal
operation, it is used to turn on or break the main circuit; in abnormal
operation, it is used to protect the main circuit from overload, short circuit
and undervoltage, and automatically cut off the circuit. And after breaking the
fault current, there is no need to change parts.
Distribution output of
diesel generator set is through circuit breaker. Circuit breaker can protect
the alternator of generating unit from being damaged by overload current or
other abnormal impact. Circuit breaker has high breaking ability and automatic
tripping ability. Users can directly draw power cable from the lower end of the
circuit breaker to load when conducting power connection.
In a word, the function
of a circuit breaker is control action and protective action.
Control function: input
or remove part of power equipment or lines according to operation requirements.
Protective action: when the power equipment or line fails, the breaker is acted on by relay protection and automatic device, and the fault part is removed quickly from the power grid to ensure the normal operation of the non-fault part of the power grid.
There
are some requirements for circuit breakers:
1.Circuit Breakers
should be able to work reliably for a long time under rated conditions.
2.Sufficient short
circuit capability should be included.
Since the grid voltage
is relatively reliable and the current is large, when the circuit breaker is
disconnected, a strong arc is generated between the contacts, and the circuit
can be opened only when the arc is completely extinguished. Therefore, circuit
breakers are required to have sufficient short-circuit capacity, especially in
the case of short-circuit faults, they should be able to reliably cut off
short-circuit current, and ensure sufficient thermal stability and dynamic
stability.
3.The shortest possible
start time should be included.
When a short-circuit
fault occurs in the power grid, the circuit breaker is required to quickly cut
off the fault circuit, which can shorten the fault time of the power grid and
reduce the short-circuit current damage to short-term equipment.
4.Simple structure and
low price.
When safety and reliability are required, economics should also be considered. Therefore, the circuit breaker should be simple in structure, small in size, light in weight, and low in price.
The types of circuit
breaker:
China air circuit
breakers have device type, universal type, fast type and current limit type,
etc., commonly used device type is DZ10 series automatic air circuit breaker,
universal type DW94, DW95, DW98 and other models, as well as DZ10 automatic air
circuit breaker.
Besides, maybe circuit
breaker has faults during working. There are two kinds of common faults in
circuit breaker of diesel generators:
1.Circuit breaker
automatic trip.
Solution: the diesel
generator set overload or short circuit trips. If the circuit breaker occurs
fault, we need to maintain or replace it.
2.The circuit breaker
cannot be closed.
Solution: the breaker
handle can only be closed after it has been disconnected. For parallel control,
not synchronized, cannot be closed. It is the fault of circuit breaker, we need
to maintain and replace it.
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Created on Nov 1st 2019 21:52. Viewed 366 times.