System and method for calibrating receiving performance of partial-discharge ultrahigh frequency detection device

Abstract

The invention relates to a system for calibrating receiving performance of a partial-discharge ultrahigh frequency detection device, and the system comprises a giagahertz transverse electromagnetic cell (GTEM) transmission cell, a standard pulse generator, a measure and control computer and a high-speed broadband oscillator, which are sequentially connected with one another through a conducting wire, wherein the high-speed broadband oscillator transmits a branch signal to the GTEM transmission cell, the top of the GTEM transmission cell is provided with a special test window which is provided with a reference sensor and a tested sensor, and the reference sensor and the tested sensor are respectively connected with the high-speed broadband oscillator. The invention also relates to a calibration method by adopting the system. The calibration system and the calibration method have a broadband property and low cost, and not only can be used for electromagnetic radiation sensitivity test, but also can be used for the electromagnetic radiation test; and moreover, the instruments used in the system and the method are simple to configure, low in cost and capable of being used for rapid and automatic test.

Description

technical field [0001] The invention relates to a system for calibrating ultra-high frequency (UHF) partial discharge detection equipment (sensors, detection systems) applicable to power transformers and gas insulated switchgear (GIS) partial discharge on-line detection technical fields using a GTEM cell . The invention also relates to a method for calibrating the receiving performance of the partial discharge UHF detection equipment using the system. Background technique [0002] Take GIS as an example to illustrate. In recent years, GIS partial discharge on-line monitoring system has been widely used in power grids and has formed a certain scale. The main testing principles include the UHF method (abbreviated as UHF in English), and the detection frequency band is between 300MHz and 1500MHz. It is safer for personnel, the system structure is simple, and it is especially suitable for online monitoring, so it has obvious advantages compared with other detection methods. ...

AI Technical Summary

Problems solved by technology

Since the UHF signal generated by partial discharge is a transient pulse type, the frequency sweep test cannot accurately reflect the ability of the sensor and detection system to receive the transient signal, and the partial discharge UHF signal has rich spectrum components up to several GHz. The necessary microwave anechoic chamber costs millions of dollars, which is extremely expensive

Therefore, it is neither economical nor scientific to use the classic sweep frequency calibration method for the calibration of partial discharge UHF detection sensors and detection systems.

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