Microcomputer arc harmonic elimination and overvoltage protection device

Abstract

The invention relates to a microcomputer arc harmonic elimination and overvoltage protection device and belongs to the arc harmonic elimination field of an electrical power system. The protection device comprises a high voltage current limit fuse, a voltage transformer, a three-phase combined overvoltage protection device, a vacuum contactor, a microcomputer arc elimination controller, a high voltage fuse and a zero sequence current transformer, wherein three-phase ports of the three-phase combined overvoltage protection device are respectively connected with a three-phase high voltage isolation switch, a ground end is connected with the voltage transformer and is then in ground connection, the high voltage fuse is connected between three-phase ports of the voltage transformer and the three-phase high voltage isolation switch, a voltage transformer control end of the microcomputer arc elimination controller is connected with the voltage transformer, a vacuum contactor control end is connected with the vacuum contactor, three-phase ports of the high voltage current limit fuse are respectively connected with the three-phase high voltage isolation switch, the other end is connected with the vacuum contactor, a ground end of the vacuum contact is in ground connection, and the zero sequence current transformer is arranged between the ground end and a ground point. The protection device is advantaged in that the motion speed is fast, and arc harmonic elimination effects can be realized.

Description

technical field [0001] The invention relates to the technical field of arc suppression and harmonic elimination in electric power systems, in particular to a microcomputer arc suppression and harmonic elimination and overvoltage protection device. Background technique [0002] At present, in the 3-35KW neutral point indirect grounding power system, since various overvoltage protectors have no arc suppression, harmonic elimination function, or single function, it cannot effectively avoid the atmospheric overvoltage caused by the system phase-to-phase and phase-to-ground , single-phase intermittent arc grounding overvoltage, ferromagnetic resonance overvoltage and other accidents, these overvoltages pose a certain threat to the life and operation safety of power system equipment. Contents of the invention [0003] The purpose of the present invention is to provide a kind of action speed fast. Overvoltage protection device capable of arc suppression and harmonic elimination....

AI Technical Summary

Problems solved by technology

[0002]In the current 3-35KW neutral point non-directly grounded power system, because all kinds of overvoltage protectors have no arc suppression and harmonic elimination functions, or have single functions, they cannot Effectively avoid accidents such as atmospheric overvoltage, single-phase intermittent arc grounding overvoltage, and ferromagnetic resonance overvoltage caused by system phases and phases to ground. These overvoltages have a certain impact on the life and operation safety of power system equipment. the threat of

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