Novel ultrahigh frequency partial discharge sensor performance detection method and system

Abstract

The invention relates to the technical field of electrical equipment insulation state monitoring, in particular to a novel ultrahigh frequency partial discharge sensor performance detection method andsystem. The method comprises the steps: a transfer function of a GHz transverse electromagnetic wave transmission chamber is acquired; after a tested sensor is placed in the GHz transverse electromagnetic wave transmission chamber, an ultrahigh frequency pulse generator sends out a predetermined pulse signal with a predetermined amplitude and a predetermined waveform; a radio frequency coupler proportionally divides the predetermined pulse signal into an output pulse signal and a coupling pulse signal; the GHz transverse electromagnetic wave transmission chamber generates an excitation electric field according to the output pulse signal; an ultrahigh-speed signal acquisition device simultaneously acquires a response signal generated by the tested sensor according to the excitation electric field and the coupling pulse signal output by the coupling end of the radio frequency coupler; and the equivalent response height of the tested sensor is obtained according to the transfer functionof the GHz transverse electromagnetic wave transmission chamber, the response signal of the tested sensor and the coupling pulse signal. The method can reduce the deviation of the final measurement result.

Description

technical field [0001] The invention relates to the technical field of electrical equipment insulation state monitoring, and more specifically relates to a novel detection method and system for the performance of a UHF partial discharge sensor. Background technique [0002] The performance sensitivity of the sensor is particularly important for the entire partial discharge UHF system. The traditional antenna calibration method is proposed for the regular antenna model, and the requirements for the calibration equipment are high and the cost is expensive. Due to the particularity of its application, the partial discharge UHF antenna has obvious differences in appearance and performance requirements from traditional antennas, and the traditional calibration method is not suitable for UHF antenna performance testing. [0003] M.D. Judd of the University of Strythclyde in the UK first proposed the use of TEM transmission lines to generate an electric field similar to the sensor ...

AI Technical Summary

Problems solved by technology

[0004] However, the inspection and comparison process of partial discharge UHF sensors based on the pulse-excited GTEM cell method includes two essential steps, that is, to measure the responses of the reference sensor and the tested sensor under pulse excitation respectively. The instability and the change of the distribution parameters in the high-speed transient process can easily cause the amplitude fluctuation and waveform change of the voltage pulse input to the GTEM cell

[0005] When testing the performance of UHF partial discharge sensors in the prior art, for the standard probe and the tested sensor, the excitation voltage waveforms of the two UHF pulse generators are regarded as the same waveform, but due to the distribution of the UHF pulse generator circuit Influenced by parameters, the pulse waveforms actually generated according to the same parameter control will have slight differences in amplitude and waveform. Therefore, the electric field waveform in the GTEM cell when the reference standard probe and the measured partial discharge UHF sensor are excited twice It is also different, and some frequency points will cause a large deviation to the final measurement result

Images