Three-phase reactor on-load switch clamping potential structure and reactor

Abstract

The invention provides a potential clamping structure of an on-load switch of a three-phase reactor and the reactor, and the structure is characterized in that ZnO valve plates are additionally arranged among three neutral points of the on-load switch of the reactor for potential clamping, and the three neutral points of the on-load switch are connected with a neutral point sleeve through lead cables; the ZnO valve plates are averagely divided into three groups, each phase of the three-phase neutral points is a group of ZnO valve plates, four terminals are led out, and one group of ZnO valve plates is connected between every two phases of neutral points; and if the potential difference between the neutral points of two adjacent phases of the on-load switch of the reactor is lower than the potential at the two ends of the ZnO valve plate, the ZnO valve plate is not conducted, the neutral points of the two adjacent phases are in an insulated state, and if the ZnO valve plate is conducted, the inter-phase potential of the neutral points of the on-load switch is clamped. According to the scheme provided by the invention, when the inter-phase potential difference exceeds the clamping potential of the ZnO valve plate, the line where the ZnO valve plate is located is instantly conducted, so that discharge breakdown between neutral points on the on-load switch is prevented, and the switch is effectively protected.

Description

technical field [0001] The invention belongs to the technical field of reactors, and in particular relates to a structure and a reactor for a three-phase reactor on-load switch to clamp potential. Background technique [0002] The three-phase shunt reactor is equipped with an on-load switch, which can adjust the compensation capacity of the shunt reactor within a certain range. Compared with the common fixed-capacity high-voltage shunt reactor, it can meet the higher requirements of power users on the transmission quality. The high voltage side of the reactor is directly connected to the transmission line, the neutral point side is connected to the three neutral point bushings through the neutral point of the on-load switch, and the external connection is grounded. In order to meet the test requirements for single-phase reactance measurement of three-phase shunt reactors, the three neutral points on the switch need to be independent of each other. Due to the different insta...

AI Technical Summary

Problems solved by technology

Due to the different installation positions of the three-phase neutral point bushing, the lengths of the three-phase leads connected from the switch to the neutral point bushing are different, and there is also a certain potential difference in the test line connected to the neutral point bushing , There will be a large potential difference between the neutral point test phase and the non-test phase on the load switch. If the potential difference is too large, it will cause breakdown between the neutral points and eventually damage the switch.

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