GIS partial discharge UHF sensor equivalent height sweeping frequency reference calibration method

Abstract

The invention discloses a GIS partial discharge UHF sensor equivalent height sweeping frequency reference calibration method. Firstly a calibration platform composed of a GTEM cell, a sweeping frequency signal source, a high-speed digital oscilloscope, a single-pole standard probe, a sensor to be tested, a measurement and control computer, calibration software and various cable accessories is established; continuous sine wave voltage signals of fixed amplitude are injected in the GTEM cell via the sweeping frequency signal source, the output ports of the single-pole standard probe and the sensor to be tested are respectively connected with the measurement port of the oscilloscope, and the voltage signals coupled by the single-pole standard probe and the sensor to be tested are acquired in real time via calibration software; and the frequency domain equivalent height curve of the sensor to be tested is calculated according to a sweeping frequency reference method. The method has clear principle and can effectively measure the equivalent height curve of a GIS partial discharge UHF sensor; degree of integration is high and operation is simple and convenient; and measurement precision is high, intermediate error generated by performing FFT transform on time domain pulse signals can be eliminated, and scientific evaluation of coupling performance of the GIS partial discharge UHF sensor can be realized.

Description

technical field [0001] The invention belongs to the field of state detection of substation equipment, and mainly studies the problem of performance checking of GIS partial discharge UHF sensors, and specifically relates to a sweeping reference calibration method for the equivalent height of GIS partial discharge UHF sensors. Background technique [0002] At present, GIS partial discharge UHF sensors lack an effective and unified calibration method, resulting in more and more failure cases of GIS partial discharge UHF detection, which seriously restricts the healthy development of GIS partial discharge UHF detection industry. To this end, it is necessary to establish a scientific and reasonable calibration method for GIS partial discharge UHF sensors, form relevant product technical specifications, and objectively evaluate the GIS partial discharge UHF sensors connected to the network. [0003] The equivalent height measurement based on the time-domain pulse reference method ...

AI Technical Summary

Problems solved by technology

[0005] 1. The UHF electromagnetic wave signal radiated by the pulse signal source should be equivalent to the UHF signal of partial discharge. The partial discharge signal has randomness. How to determine the parameters of the pulse signal source is one of the key and difficult issues. The output amplitude of the pulse signal source and The influence of parameters such as rise time on the calibration results of UHF sensor equivalent height cannot be effectively evaluated;

[0006] 2. Performing FFT transformation on the time-domain voltage waveform may bring intermediate errors to the calibration results of the equivalent height of the UHF sensor

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