Microcomputer arc-extinguishing resonance-elimination overvoltage protection device

Abstract

The invention provides a microcomputer arc-extinguishing resonance-elimination overvoltage protection device and relates to the technical field of electric power system arc-extinguishing and resonance-elimination. The microcomputer arc-extinguishing resonance-elimination overvoltage protection device comprises a high-voltage current limiting fuse, a voltage transformer, a three-phase combined overvoltage protector, a vacuum contactor, a microcomputer arc-extinguishing controller, a high-voltage fuse and a zero-sequence current transformer. Three phase ports of the three-phase combined overvoltage protector are respectively connected with a three-phase high-voltage isolation switch. A grounded end is connected with the voltage transformer and then is grounded. The high-voltage fuse is serially 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-extinguishing controller is connected with the voltage transformer, and a vacuum contactor control end is connected with the vacuum contactor. Three phase ports of the high-voltage current limiting fuse are respectively connected with the three-phase high-voltage isolation switch, and the other end of the high-voltage current limiting fuse is connected with the vacuum contactor. A grounded end of the vacuum contactor is grounded, and a zero-sequence current transformer is arranged between the grounded end and a grounding point. The overvoltage protection device provided by the invention is high is action speed and is capable of realizing arc-extinguishing and resonance-elimination.

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 non-directly grounded power system, since various overvoltage protectors have no arc suppression, harmonic elimination functions, or single functions, 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 elim...

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

Images