On-load tap-changer protection device and method based on comprehensive characteristic quantity

Abstract

The invention discloses an on-load tap-changer protection device and method based on comprehensive characteristic quantity. The device comprises an oil pressure starting unit, a strain starting unit, a deflection starting unit, a deflection protection unit, a tripping unit and an anti-explosion unit capable of absorbing energy. The oil pressure starting unit is connected with the strain starting unit, the explosion-proof unit is connected with the strain starting unit, the strain starting unit is connected with the deflection starting unit, the deflection starting unit is connected with the deflection protection unit, and the deflection protection unit is connected with the tripping unit. According to the invention, the fault discrimination of the on-load tap-changer is realized by comprehensively utilizing multiple characteristic quantities such as the high insulating oil pressure, the strain of the explosion-proof unit and the deflection of the top cover of the on-load tap-changer, and the overall mechanical performance of the on-load tap-changer and the accuracy and reliability of fault discrimination are improved. Meanwhile, the sensor used in the device meets the complex environment of high temperature, greasy dirt and strong electromagnetism in the on-load tap-changer from both precision and application range.

Description

technical field [0001] The invention belongs to the technical field of non-electricity protection of on-load tap changers in electric power systems, and in particular relates to an on-load tap-changer protection device and method based on comprehensive characteristic quantities. Background technique [0002] With the rapid development of the UHV DC transmission project, as the key equipment for electric energy transmission, the stable operation of the converter transformer plays an important role in the reliable transportation of the power grid and the flexible distribution of electric energy. The converter transformer is the core equipment for energy conversion and transmission in the converter station, and the on-load tap changer is an important component of the converter transformer. [0003] The on-load tap-changer plays an important role in adjusting reactive power, compensating network measurement voltage fluctuations and stabilizing DC voltage in the power system. It ...

AI Technical Summary

Problems solved by technology

Statistics show that the abnormality of the on-load tap-changer causes transformer faults to account for more than 20% of the total faults, and is often accompanied by deformation and rupture of the top cover of the on-load tap-changer, causing huge economic losses

At the same time, some on-load tap-changers that are damaged due to faults are loaded with pressure relief valves and electrical quantity protections that operate correctly, but explosion and rupture accidents of on-load tap-changers are still unavoidable. The relay protection device and method for the internal fault of the switch realize the fault screening and removal, and at the same time cut off the evolution process of the internal fault of the tap changer to the accident

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