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Discussion on the damage reason of DC contactor

2020-07-15 H:02:44
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By analyzing the causes of DC contactor damage, the following four points are summarized

How to connect DC contactor

1. DC contactor is affected with damp: the climate in Yidu is humid, the DC contactor is eroded by moisture, resulting in its damage.

2. Human factors: due to the lack of technical experience of maintenance personnel, when replacing a new DC contactor, the wiring is wrong, resulting in DC contactor damage after putting into operation.

3. Quality problem of DC contactor: some DC contactor's action part gap is too large, which makes the action reliability is high, it is easy to discharge ignite, so as to damage the DC contactor. At the same time, some DC contactors can't work normally because they are in charging state for a long time, which leads to their damage.

4. Voltage instability: because the voltage of DC system in the station is too high too low, it will be damaged.

There are many kinds of DC contactors, their structures are different, but their operation principles are basically the same. DC contactor is an electrical appliance suitable for making breaking DC main circuit large capacity control circuit with rated working voltage of 1200V below in long distance. When DC contactor contacts switch under high DC current, electric arc will be generated. The contact corrosion caused by arc reduces the working life of contactor, which makes the electrical life of DC contactor far less than its mechanical life. Therefore, the arc can be extinguished as soon as possible, which can effectively protect the contact burning improve the electrical life of DC contactor.

The common arc extinguishing methods of DC contactor include lengthening arc forced cooling arc. The forced cooling arc includes series excitation coil magnetic blowing out arc, parallel excitation coil magnetic blowing out arc, permanent magnet magnetic blowing out arc, narrow slot arc extinguishing, grid plate arc extinguishing so on. The structure of the arc extinguishing chamber is also designed based on one two more of the above arc extinguishing methods.

DC contactor


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