High-voltage AC combined throw in/off switch

Abstract

The high-voltage AC combined throw in-off switch has mechanical switch and voltage-sensitive resistor connected parallelly with the primary of the step-down transformer before connected serially in the high voltage AC loop, solid switch connected parallelly with the secondary of the step-down transformer, synchronous transformer TB as trigger with the primary connected across the high voltage AC network and secondary connected electrically with the controller KZ comprising triggering pulse holder MB and voltage phase trigger XC and mechanical switch delay KY. Its throw in / off signal input is connected electrically with the upper mechanism or manual button switch. It has lower electric stress in mechanical switch, improved load running condition and high performance / cost ratio, and may be used for the frequency throw in / off of various large high-voltage dynamic reactive compensating and filtering device.

Description

technical field [0001] The invention relates to various large-scale dynamic reactive power compensation and filter devices adopting switch switching, in particular to a high-voltage AC composite switching switch used in a high-voltage AC system above 10KV. Background technique [0002] Reactive power and harmonics are one of the problems that need to be solved urgently in today's power system. For this, various large-scale dynamic reactive power compensation and filtering devices are used at home and abroad, and a considerable number of them are capacitor banks that use switching switches. . Among these devices, the switching switch is extremely critical, and its performance is related to the reliability of the entire device operation. It is generally required that the switching switch has a faster operating speed and a smaller electrical stress, which is suitable for frequent operation and at the same time takes into account the cost. The switches currently used for switc...

AI Technical Summary

Problems solved by technology

But at the same time, there are many deficiencies: First, it is easy to re-ignite when breaking the capacitor circuit, causing overvoltage. In addition, when the switch is operated, the bounce of the contact may occur, which will also cause overvoltage; A large inrush current; thirdly, an arc is generated when the switch is opened, which affects the life of the switch; fourthly, the time delay of the switching action is relatively large

Thyristor switches in high voltage systems are therefore expensive and less reliable

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