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What if the DC contactor connector is reliable?

2020-07-15 H:59:05
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If the contact of DC contactor is reliable, the contact resistance between the dynamic static contacts will increase, resulting in the contact surface temperature being too high, making the surface contact become point contact, even non conducting phenomenon. The causes of this failure are as follows:

(1) There are oil, scurf foreign matters on the contact.

(2) The contact surface is oxidized after long-term use.

(3) Arc ablation causes defects, burr formation of metal chip particles.

(4) The moving part is blocked.

Cause treatment method of too much spark when DC contactor is on off

The treatment methods for the unreliable connector of DC contactor are as follows:

(1) For the oil, hair foreign matter on the contact, it can be cleaned with cotton cloth dipped in alcohol gasoline.

(2) If it is a silver silver based alloy contact, the contact surface will form an oxide layer form slight burn blackening under the action of electric arc, which generally does affect the work, can be scrubbed with alcohol, gasoline carbon tetrachloride solution. Even if the surface of the contact is burnt unevenly, you can only use a fine file to remove the spatter burr around. Do file too much to avoid affecting the contact life. For copper contacts, if the degree of burn is relatively light, just repair the uneven parts with a fine file, but it is allowed to use fine abrasive cloth to polish, so as to avoid quartz sand particles remaining between the contacts maintain good contact; if the burn is serious the contact surface is low, the new contact must be replaced.

(3) The moving part is jammed can be disassembled for maintenance.

The electromagnetic system of DC contactor consists of coil, iron core armature. The electromagnetic system adopts the beat type of armature rotating around the edges corners. Because the coil is direct current. There will be no heating caused by eddy current hysteresis loss in the iron core. The iron core can be made of cast steel cast iron. The end face of the iron core does need to be embedded with a short-circuit ring. In order to ensure that the armature can be released reliably after the coil is cut off, a non-magnetic gasket is often padded in the magnetic circuit to reduce the influence of residual magnetism.

DC contactor


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