The low-voltage air circuit breaker is the primary equipment for low-voltage power distribution, and it should be able to operate reliably when the electrical equipment is no-load, load-loaded or short-circuited. Its primary function is to maintain the circuit and equipment, can turn on, carry and break the current under normal circuit conditions, and can also turn on and carry the current at a certain time and break the current under the specified abnormal conditions (such as short circuit conditions).
Low-voltage air circuit breaker, also known as structural circuit breaker, has a structural current range of 630-6300A, and is mainly used for incoming wires, bus connections and other high-current circuits of low-voltage power distribution. In practical applications, the circuit breaker trips by mistake, which refers to the active tripping of the circuit breaker when there is no short circuit and no abnormality of the line.
1) The power supply disappears, such as the closing fuse, the control fuse is blown or defective.
2) The small switch of the closing power supply in the local control box is not closed
3) The circuit breaker is closed and locked, and it is not restored
4) The circuit breaker operates the "remote-local" selection switch in the control box in the local position
5) The control circuit is disconnected
6) The synchronization loop is disconnected
7) The closing coil and the closing circuit relay are burned out
8) Operation relay failure
9) The control handle is out of order
10) Poor contact of the control switch
11) Poor auxiliary contact of circuit breaker
12) Operational organization failure
13) The DC voltage is too low
14) Poor DC contact
Taking the zero-crossing arc extinguishing of SN10-10 I type I oil-less circuit breaker as an example, in a type experiment. When the 10% and 30% combined experiments are performed, the phenomenon of zero-crossing arc extinguishing is presented. Judging from the waveform. There is no abnormal situation, only after the zero point is crossed, the arc is cut off, and after disintegration. It is found that the arc extinguisher of the circuit breaker is loose and not compressed, forming an arc extinguishing chamber to relieve pressure and make the arc extinguishing pressure small, and blow the arc continuously. After analysis, the reason is that the organization and transmission part are accurate and reliable. It is to rely on mechanical force to break the arc when the conductive rod is going down.
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