Ultra-high-frequency-method-based coupling oil-paper-insulation partial discharge detection system in composite electric field

Abstract

The invention discloses an ultra-high-frequency-method-based coupling oil-paper-insulation partial discharge detection system in a composite electric field. The detection system is composed of a composite electric field coupling oil-paper-insulated partial discharge unit, a UHF signal acquisition unit, a signal transmission unit and a host display unit. The partial discharge unit consists of a direct-current power source, a pulse power source, a voltage distribution assembly, and an analog partial discharge device; the output terminals of the direct-current power source and the pulse power source are connected to the input terminal of the voltage distribution assembly; the output terminal of the voltage distribution assembly is connected to the input terminal of the analog partial discharge device; the output terminal of the analog partial discharge device is connected to the input terminal of the UHF signal acquisition unit; output terminals of a voltage feedback amplification circuitand a voltage stabilization circuit are connected to an input terminal of a signal transmission unit; and the output terminal of the signal transmission unit is connected to the input terminal of thehost display unit. Therefore, complicated work conditions of a valve-side casing tube of a converter transformer are simulated accurately; and the operation is done quickly and safely.

Description

technical field [0001] The invention belongs to the field of oil-paper insulation partial discharge detection, in particular to a composite electric field coupling oil-paper insulation partial discharge detection system based on UHF method. Background technique [0002] As a strong technical support for condition-based maintenance, the live detection technology of power transmission and transformation equipment has been incorporated into the routine detection system of State Grid Corporation of China, and it is an effective technical means for fault diagnosis of power equipment. In recent years, with the development of HVDC (High Voltage Direct Current, HVDC), the analysis of partial discharge phenomenon of oil-paper insulation under the action of DC voltage, pulse voltage and pulse voltage has become a research hotspot. However, at this stage, the research on the test and diagnosis technology of partial discharge under compound voltage is still in its infancy at home and ab...

AI Technical Summary

Problems solved by technology

However, at this stage, the research on the test and diagnosis technology of partial discharge under compound voltage is still in its infancy at home and abroad.

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