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AC contactor

A technology of AC contactors and main contacts, which is applied in the direction of relays, electromagnetic relays, and detailed information of electromagnetic relays. The effect of breaking time, preventing burnt contacts, and reliable performance

Inactive Publication Date: 2005-06-01
陈浩升
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is used to control the on and off of the capacitor, that is, the AC contactor whose load is a capacitor, often when operating, because the equivalent load of the surge current of the capacitor is too large, the drop-down resistor is easy to burn out after a long time of live work. bad, the contactor itself is also burned out due to the loss of effective protection, and it may also cause damage to other equipment
[0003] In addition, in the existing AC contactor, the normally open auxiliary contact is closed synchronously with the main contact in structure. After the main contact is powered on, the normally open auxiliary contact is disconnected under the action of the spring. This technology can only Complete the protection of one aspect of the contactor, that is, it protects when the contactor is closed; but when the contactor breaks a large current circuit, a strong arc will be generated between the moving and static contacts, which will burn contacts, prolonging the breaking time of the circuit, and damaging the contactor

Method used

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Embodiment Construction

[0023] see figure 1 , 2 , 3, among them,

[0024] 1---normally closed auxiliary contact; 2---normally open auxiliary contact; 3---three-phase main contact; 5---coil terminal; 6---dropping resistor; 7--- Discharge resistor; 8 --- Non-linkage normally closed auxiliary contact.

[0025] AC contactor, including normally closed auxiliary contact 1, normally open auxiliary contact 2, non-linkage normally closed auxiliary contact 8, three-phase main contact 3, spring, coil, iron core, shell, base, contact Support, etc., among them, the normally closed auxiliary contact 1 and the normally open auxiliary contact 2 are connected in linkage, that is, when the coil is energized, the normally open auxiliary contact 2 is closed, and the normally closed auxiliary contact 1 is broken, and vice versa.

[0026] The contactor involved in this embodiment has 3 pairs of normally open main contacts, and 6 pairs of linkage auxiliary contacts connected to the dropping resistor 6, including 3 pairs...

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PUM

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Abstract

The invention relates to a contactor, in particular to an AC contactor specially used for switching low-voltage shunt capacitors. The object of the present invention is to provide an AC contactor with a switchable capacitor circuit that is small in size, light in weight, high in precision, strong in on-off capability and reliable in performance. The contactor designed by the present invention is suitable for AC 50Hz (or 60Hz), rated operating voltage 380V, switching capacitance 44Kvar and below capacity power lines, used to connect and break the circuit where the capacitor is located, and can effectively inhibit the capacitor from appearing when the capacitor is switched on. Inrush current, and can form a unit with a thermal overload relay to protect possible operating overload circuits, replacing the existing switching device consisting of a contactor and three current-limiting reactors.

Description

technical field [0001] The invention relates to a contactor, in particular to an AC contactor specially used for switching low-voltage shunt capacitors. Background technique [0002] The existing AC contactor, mainly in the design of the step-down resistor circuit technology, has not completed the technical requirements of the technology. It only has the normally open auxiliary contact and the connection between the resistance and the main contact to work for a long time synchronously. There are few auxiliary contacts. Designed to run for short periods of time. However, it is used to control the on and off of the capacitor, that is, the AC contactor whose load is a capacitor, often when operating, because the equivalent load of the surge current of the capacitor is too large, the drop-down resistor is easy to burn out after a long time of live work. If it is damaged, the contactor itself will be burned due to the loss of effective protection, and it may also cause damage to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H9/42H01H50/54
Inventor 陈浩升
Owner 陈浩升