Capacitor contactor with bistable current limiting contacts

Abstract

A capacitive contactor with bistable current-limiting contacts, including a resistance wire group connected in parallel with the current-limiting contact group and the contactor body, the base of the current-limiting contact group is installed on the contactor body in a vertical manner, The auxiliary moving contact of the flow contact group has two stable positions, initial and released, which are defined by the support of the auxiliary contact, the reaction force spring and the cover plate on the base, and the position of the auxiliary moving contact In the initial steady state position, the main contact of the contactor body is broken, and the magnetic coupling mechanism of the current-limiting contact group is attracted. When the auxiliary movable contact is in the release stable position, the main contact of the contactor body is closed, and the magnetic coupling mechanism is released. In the initial steady state position, there is an initial opening distance L1 between the attached moving contact and the attached static contact of the current limiting contact group, and in the release steady state position, there is a release distance between the attached moving contact and the attached static contact. Distance L11, and in each operation of the contactor, the distance between the attached contact pair is automatically switched between these two different distance values, which can be applied to contactors of any specification.

Description

technical field [0001] The invention relates to a capacitive contactor, in particular to a capacitive contactor with a bistable current-limiting contact, which is extremely versatile and can prevent the secondary connection of the current-limiting contact, and can be used for automatic compensation of reactive power In the compensation equipment, the power factor is improved by switching capacitors. Background technique [0002] Using capacitor contactors to switch capacitors is a traditional capacitor switching method. Capacitive contactors are derived from direct-acting AC contactors, and are generally divided into two forms in structure: one is the upper and lower type as disclosed in the invention patent application with the publication number CN1262774A or the utility model patent with the authorized announcement number CN2606963Y. structure, their current-limiting contact group is located above the main body of the contactor; the other is a left-right structure as dis...

AI Technical Summary

Problems solved by technology

For example, the existing current-limiting contact group adopts the monostable principle structure design, that is, whether the capacitive contactor is in the normal state of connection or normal state of breaking, the auxiliary contact support and the auxiliary movable contact are all in the same initial position. state, thus leading to two major problems that are difficult to overcome in the design and manufacture: one is the matching contradiction between the stroke, position relationship and change (movement) characteristics of each linkage, and the other is the design characteristics of each stroke and position variable and the actual Large random drift between features

Specifically, because the stroke and position variables of each linkage constitute a complex multiple closed dimension chain, and each variable must not only meet the working principle requirements of the capacitor contactor, but also meet the respective structural requirements, so the closed dimension must be It is very difficult to meet the two requirements in the chain at the same time, and some are even contradictory; and because the stroke and position variables of each linkage constitute a complex multiple closed size chain, and one variable is affected by multiple random factors , if the distance between the permanent magnet and the magnetic guide plate is less than the critical distance, it will actually be affected by factors such as the performance of the permanent magnet, size error, installation error, and the elastic force error of the reaction force spring and overtravel spring, so the design characteristics of the variable and There will inevitably be random drift between the actual characteristics, and when one of the variables drifts, it will inevitably cause random drift of other variables, resulting in poor reliability (such as secondary breaking during the connection process, secondary breaking during the breaking process, etc.) High failure rate of first connection), poor stability (such as high sensitivity to temperature rise), difficult manufacturing (such as high requirements for processing accuracy and assembly accuracy of related parts, difficult installation and debugging), poor versatility (the same limit A series of defects such as the flow contact group cannot be applied to contactor bodies of different specifications) and it is difficult to improve the quality level of the product

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