Direct point arc extinguishing mode

Publisher： Apollo / 2021-08-12/ Views：1044

Direct point arc extinguishing mode:There are many kinds of DC contacters. In fact, there are some differences in their structure, but the basic concept of their body position is basically the same. Dc contacters are electrical products that can be connected and broken off the main ac power supply circuit and large capacity control circuit for the rated current and voltage of 1200V and below remotely. When the contact of the DC contactis changed under the high ac current value, it will produce the electric solitary. The corrosion of the contact caused by the electric solitary reduces the working life of the DC contactis, so that the working life of the DC contactis lower than that of the industrial equipment. So that the electric solitary as soon as possible off, can effectively maintain and maintain the disconnecting switch is not damaged, improve the service life of the DC contacter electrical equipment.

What is the difference between dc and DC contactor?

The common arc extinguishing methods of contactor are changed, such as long electric solitary, strong cold electric solitary, strong cold electric solitary has a series of excitation regulator coil magnetic blowing out of arc, and excitation regulator coil magnetic blowing out of arc, permanent magnet blowing out of arc, narrow slot arc extinguishing, gate arc extinguishing and other methods. The structure of the arc suppression chamber is designed according to one or two of the above arc suppression modes or the combination of the upper and lower schemes. The direction of the ac solitary motion in communication is determined. Therefore, in a stable magnetic field, the AC solitary arc is usually blown out by permanent magnet. Because the motion law of the AC solitary is certain, the direction of the AC solitary arc can be blown out by magnetic.

According to the analysis of the causes of the damage of the DC contactor, four points are summed up: how the DC contactor should be wired.

1, DC contactor wet: Yidu humid climate, with dc contactor will be damaged by moisture erosion in the human body.

2. Cause of human error: Due to lack of experience in maintenance work, the line is wrong when replacing the DC contactor, which leads to the damage of the DC contactor after it is put into use.

3, dc contactor commodity quality problems: some DC contactor itself attitude part of the gap is too large, so that the action reliability of the contactor is not high, easy to discharge ignition phenomenon, so as to damage the DC contactor. In addition, because some DC contacters are in the state of battery charging for a long time, they can not maintain all normal posture under the condition of maintaining a certain posture, so they are damaged.

4, short circuit fault: due to the site internal AC system working frequency is too high or too low, it will also cause damage.