Arc extinction, harmonic elimination and overvoltage protection device of microcomputer

Abstract

The invention discloses an arc extinction, harmonic elimination and overvoltage protection device of a microcomputer, and relates to the technical field of arc extinction and harmonic elimination of a power system. The arc extinction, harmonic elimination and overvoltage protection device comprises high-voltage current-limiting fuses, a voltage transformer, a three-phase combined overvoltage protector, vacuum contactors, a microcomputer arc extinction controller, high-voltage fuses and a zero sequence current transformer, wherein three phase ports of the three-phase combined overvoltage protector are separately connected with three phase high-voltage isolation switches, a ground end is connected with the voltage transformer and then is grounded, the high-voltage fuses are connected in series between three phase ports of the voltage transformer and the three phase high-voltage isolation switches, a voltage transformer control end of the microcomputer arc extinction controller is connected with the voltage transformer, vacuum contactor control ends are connected with the vacuum contactors, the three phase ports of the high-voltage current-limiting fuses are separately connected with the three phase high-voltage isolation switches, the other ends of the high-voltage current-limiting fuses are connected with the vacuum contactors, vacuum contactor ground ends are grounded, and the zero sequence current transformer is arranged between the ground end and a ground point. The overvoltage protection device has the advantages of fast action speed and can be used for arc extinction and harmonic 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 elimina...

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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