Partial discharge measurement device under impulse voltage on site and signal processing method thereof

Abstract

The invention discloses a partial discharge measurement device under impulse voltage on site and a signal processing method thereof. The device comprises a current sensor, a tapping point, a voltage attenuator, a voltage transient suppression device and a back-end processing and displaying system, wherein the output end of the current sensor is connected to the input end of the tapping point through an integrating resistor and a coaxial-cable; one path of the output end of the tapping point is connected to the input end of the voltage attenuator, and the other path is connected to the input end of the voltage transient suppression device; and the output ends of the voltage attenuator and the voltage transient suppression device are respectively connected onto the backeend processing and displaying system. The partial discharge measurement device under impulse voltage on site detects a displacement current signal on a GIS (Geographic Information System) ground wire through a Rogowski coil, the on-site measurement for loop building is simple, and the measurement mode is easy to operate and ensures the security of personnel and equipment.

Description

technical field [0001] The invention belongs to the technical field of GIS equipment insulation status detection, and in particular relates to a partial discharge measurement device and a signal processing method for on-site impulse voltage, which is suitable for partial discharge under the impulse voltage of ultra-high voltage (750kV) GIS equipment on the spot signal processing. Background technique [0002] Problems that may occur in the manufacture, transportation, storage and installation of gas-insulated metal-enclosed switchgear (GIS) include loose parts, falling off, scratches on the electrode surface or damage to the electrode surface caused by misalignment. Defects, ingress of conductive particles or tools left in the device, etc. All of the above unexpected factors will lead to insulation failures. Relevant statistics show that about 2 / 3 of GIS insulation accidents occur on equipment that has not undergone on-site withstand voltage tests. The purpose of the on-si...

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Problems solved by technology

[0005] At present, there is no mature method for on-site partial discharge detection under impulse voltage, and there is also a lack of relevant test standards. Based on this, this method proposes to perform partial discharge detection at the same time as the standard impulse withstand voltage test, using Rogowski coils from The displacement current signal is obtained on the ground wire of the GIS test object, and the partial discharge signal is extracted through some signal processing techniques

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