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AC contactor

An AC contactor and main contact technology, applied in relays, electromagnetic relays, electromagnetic relay details and other directions, can solve the problems of loss of effective protection of contactors, prolong circuit breaking time, easy to burn out voltage drop resistors, etc., to shorten the Circuit breaking time, preventing burn contacts, and reliable performance

Inactive Publication Date: 2003-12-24
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

[0028] See figure 1 , 2 , 3, where,

[0029] 1---normally closed auxiliary contact; 2---normally open auxiliary contact; 3--three-phase main contact; 4---discharge resistance contact; 5---coil terminal; 6- -Voltage resistance; 7---discharge resistance; 8---normally closed auxiliary contact.

[0030] AC contactors, including normally closed auxiliary contacts 1, normally open auxiliary contacts 2, normally closed auxiliary contacts 8, three-phase main contacts 3, springs, coils, iron cores, housing, bases, contact supports, etc., Among them, the normally closed auxiliary contact 1 and the normally open auxiliary contact 2 are linked, that is, when the coil is energized, the normally open auxiliary contact 2 is closed, and the normally closed auxiliary contact 1 is disconnected, and vice versa.

[0031] The contactor involved in this embodiment has 3 pairs of normally open main contacts, and there are 6 pairs of linkage auxiliary contacts connected to the step-down resistor 6, incl...

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PUM

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Abstract

The contactor designed in this invention is suitable to power line in condition of AC 50Hz (or 60Hz), rated operational voltage 380V, switching capacitance 44Kvar or lower. In switching circuit in orbreaking off circuit with capacitors, the contactor can restrain rush currents occurred on the circuit with capacitors effectively. The contactor combined with thermal overload relay constitutes a unit to protect possible overloaded circuits in operation. The invented contactor can replace present contactors constituted by one contactor and three current limiting reactors. The contactor has advantages of small size, lightweight, high accuracy, strong on off capability and reliable performances.

Description

Technical field [0001] The invention relates to a contactor, in particular to an AC contactor specially used for switching low-voltage parallel 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 process. It has only the normally open auxiliary contact and the resistance and the main contact to connect for a long time, and there are few auxiliary contacts. Designed to run in a short time. However, it is used to control the on and off of the capacitor, that is, the AC contactor whose load is a capacitor. When it is in action, because the equivalent load of the capacitor surge current is too large, the step-down resistor is easy to burn after a long time of live working. Otherwise, the contactor itself will be burned out due to the loss of effective protection, and it may also cause damage to other equipment. [0003] In addition, in the existing A...

Claims

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Application Information

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