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Low-voltage capacitor intelligent synchronous zero passage switch and method for controlling capacitor bank switching

A low-voltage capacitor and low-voltage technology, which is applied in the field of power switching control equipment, can solve the problems of easy damage and complex structure of thyristors, and achieve the effects of low manufacturing cost, fast opening and closing speed, and stable performance.

Inactive Publication Date: 2013-09-25
STATE GRID CORP OF CHINA +2
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  • Abstract
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Problems solved by technology

However, the composite switch technology uses both thyristors and relays, so its structure becomes quite complicated, and also due to the sensitivity of thyristors to the rate of voltage change (dv / dt), they are also relatively easy to damage

Method used

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  • Low-voltage capacitor intelligent synchronous zero passage switch and method for controlling capacitor bank switching
  • Low-voltage capacitor intelligent synchronous zero passage switch and method for controlling capacitor bank switching

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Embodiment Construction

[0019] The principle and structure of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] Such as figure 1 with 2 Shown:

[0021] A low-voltage capacitor intelligent synchronous zero-crossing switch includes a synchronous zero-crossing detection control unit 1 and a low-voltage vacuum contactor packaged in a housing 8 . The synchronous zero-crossing detection control unit 1 includes a voltage and current zero-crossing sampling circuit, an alarm circuit, a voltage and current time reference point detection circuit, an input and output interface of an operation command, and a single-chip microcomputer. The synchronous zero-crossing detection control unit detects voltage and current phases, and calculates the opening and closing action time according to the preset action conditions, and calculates the delay time of the command.

[0022] The low-voltage vacuum contactor is an existing technology, which includes a permane...

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Abstract

The invention discloses a low-voltage capacitor intelligent synchronous zero passage switch which comprises a synchronous zero passage detection control unit and a low-voltage vacuum contactor. A single chip microcomputer is taken as a core, a sampling loop and reasonable program design are supplemented, the problem that in the process of low-voltage capacitor switching, high-voltage harmonic waves and inrush currents occur is solved, and safety and reliability of a capacitor switching switch are improved. The low-voltage capacitor intelligent synchronous zero passage switch is low in manufacturing cost, simple and durable in structure and little in power dissipation.

Description

technical field [0001] The invention relates to the technical field of power switching control equipment, in particular to a low-voltage capacitor intelligent synchronous zero-crossing switch and a method for controlling capacitor bank switching. Background technique [0002] The traditional high-voltage reactive power compensation device generally uses a special contactor for switching low-voltage capacitors or a compound switch or a thyristor to switch the capacitor bank, and uses a reactive power compensation controller to control the switching of the switch to realize the automatic operation of the capacitor bank. [0003] For the contactor control input type compensation device, because the voltage of the capacitor cannot be transient, a large inrush current will be formed when the capacitor is directly input, and the maximum inrush current may even exceed 100 times the rated current of the capacitor. The generated inrush current will adversely interfere with the power ...

Claims

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Application Information

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IPC IPC(8): H02J3/18
CPCY02E40/30
Inventor 程军尹逊景高培华段利军孔繁云杨柏松张琳
Owner STATE GRID CORP OF CHINA
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