Field Strength Traceability Method and System for Partial Discharge UHF Calibration Based on GTEM

Abstract

The invention discloses a method and system for field strength traceability of partial discharge ultra-high frequency calibration based on GTEM. The voltage value of the signal transmitted by the pole probe, and the electric field intensity at the position of the monopole probe is calculated through the transfer function of the monopole probe; the electric field intensity at the corresponding position in the GTEM cell under the same pulse signal condition is simulated by computer And amended, the simulation electric field strength is compared with the electric field strength calculated by the test, to confirm the accuracy of the electric field strength calculated by the test; the system includes a pulse signal source unit, a GTEM chamber, a monopolar probe, a voltage measurement unit, a computer and Correction unit; the method and system can be further used to verify the sensitivity of the partial discharge ultra-high frequency detection system, so as to ensure the reliable operation of the ultra-high frequency detection equipment installed in the power grid.

Description

technical field [0001] The present invention relates to the field of ultra-high frequency partial discharge detection, and more specifically, to a method and system for field strength traceability of partial discharge ultra-high frequency calibration based on GTEM. Background technique [0002] UHF partial discharge detection technology is widely used in partial discharge detection of electrical equipment due to its high sensitivity, strong anti-interference ability and can be used for partial discharge type identification. Before the UHF detection equipment is connected to the network, it is necessary to calibrate its sensor and system sensitivity to ensure that the installed UHF detection equipment operates reliably and can meet the basic requirements of detection sensitivity. Since the UHF electromagnetic wave radiated by partial discharge is a nanosecond pulse signal, using the UHF pulse radiation field to calibrate the sensitivity of the detection system can reflect the...

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Problems solved by technology

[0004] In order to solve the problem in the background technology that the calibration of pulsed electromagnetic fields cannot be accurately traced, the present invention provides a method and system for field strength traceability of partial discharge UHF calibration based on GTEM. The method and system will transfer function The calculable monopole probe is used as a reference sensor to back-calculate the electric field intensity of the pulsed electromagnetic field at the calibration position in the GTEM cell, and simulate the test by computer, and simulate the electric field intensity corresponding to the calibration position to compare the electric field calculated by the test The accuracy verification of the intensity is carried out, and the field intensity traceability method of the GTEM-based partial discharge UHF calibration includes:

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