High-voltage line reactive power compensation device

Abstract

The invention discloses a high-voltage line reactive power compensation device. The high-voltage line reactive power compensation device comprises a box body, a fuse, a first lightning arrester, a voltage regulator, a capacitor and a comprehensive monitoring and protecting controller; the fuse and the lightning arrester are electrically connected with the load side of a high-voltage line; the voltage regulator is connected with the fuse; a current transformer is arranged between the voltage regulator and the fuse; the comprehensive monitoring and protecting controller receives output signals of the current transformer and transmits a control instruction to the voltage regulator; the voltage regulator regulates voltage output and changes the voltage at the capacitor end, so that the output of the capacitance of the capacitor can be changed; and the voltage regulator has nine-level voltage output, so that the capacitor corresponding to the voltage regulator also has nine kinds of capacitance to perform reactive power compensation on the line. According to the high-voltage line reactive power compensation device of the invention, the magnitude of protecting current can be set according to the actual situation of the capacitor, so that accurate protection can be realized; no operating overvoltage is generated, no impact will be exerted on a power grid; and unified management and monitoring can be facilitated, and the unified monitoring on the compensation device can be facilitated.

Description

technical field [0001] The invention relates to the field of high-voltage lines, in particular to a reactive power compensation device for high-voltage lines. Background technique [0002] There are two types of reactive power compensation for domestic high-voltage lines today: one is fixed compensation with capacitors connected in parallel, which cannot realize dynamic tracking compensation; the other is dynamic tracking compensation, and the number of stages is too small to achieve fine compensation. At present, the most widely used automatic compensation type in China is the high-voltage reactive power compensation device on the line column, which is mainly composed of capacitor banks, switches and controllers, etc., and is connected in parallel to the power frequency AC three-phase high-voltage overhead line to improve power factor, Adjust network voltage and reduce line loss. Most of them are connected to the lines by fixed access, manual switching or automatic switchi...

AI Technical Summary

Problems solved by technology

This method not only reduces the service life of the capacitor (about 2 to 5 years), but also causes a great impact on the power grid; The extreme difference of switching is large, it is easy to make the line in the state of overcompensation or undercompensation for a long time, and it is also easy to cause mechanical failure of the switch, which not only reduces the safety and reliability of the switch, but also greatly improves the maintenance of the equipment. cost

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