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System and method of measuring performance of partial discharge transient state ground voltage detector

A technology of transient ground voltage and partial discharge, which is applied in the measurement of electrical variables, instruments, measuring devices, etc., can solve the problems of the lack of transient ground voltage detectors, affecting the manufacture and inspection of instruments, and hindering the development of technology.

Active Publication Date: 2013-07-10
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the transient ground voltage detector lacks a standardized and unified test method and test system, which affects the manufacture and inspection of the instrument and hinders the further development of technology

Method used

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  • System and method of measuring performance of partial discharge transient state ground voltage detector
  • System and method of measuring performance of partial discharge transient state ground voltage detector
  • System and method of measuring performance of partial discharge transient state ground voltage detector

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Embodiment 1

[0054] Embodiment 1 provided by the present invention is an embodiment 1 of a system for testing the performance of a partial discharge transient ground voltage detector, and its structural block diagram is as follows figure 1 shown by figure 1 It can be seen that in the first embodiment of the system for testing the performance of a partial discharge transient voltage detector, the signal generator is a sinusoidal signal generator 1 , and the model of the sinusoidal signal generator 1 may be Agilent 33250. The metal plate is the performance test metal plate 3, which can be a galvanized iron plate with a length of 300 mm and a width of 300 mm and a thickness of 3 mm, and the edges and corners are rounded. The size of the matching resistor 4 can be 50Ω. The number of TEV sensor 5 is one, and this TEV sensor 5 is closely attached to the surface of the performance testing metal plate 3 placed vertically.

Embodiment 2

[0056] Embodiment 2 provided by the present invention is an embodiment 1 of a method for testing the performance of a partial discharge transient voltage detector. Embodiment 1 of a method for testing the performance of a partial discharge transient voltage detector is based on figure 1 The first embodiment of the system for testing the performance of the partial discharge transient ground voltage detector is shown, the frequency band of the transient ground voltage detector 6 is tested, and the method includes:

[0057] Step S101 , adjusting the amplitude of the sinusoidal signal output by the sinusoidal signal generator 1 to any value within the range of 2V-5V and maintaining it unchanged.

[0058] Step S102, changing the frequency of the sinusoidal wave output by the sinusoidal signal generator 1 between the upper and lower limit cut-off frequencies specified by the transient ground voltage detector 6 under test, and detecting that the output signal of the transient ground v...

Embodiment 3

[0065] Embodiment 3 provided by the present invention is a second embodiment of a method for testing the performance of a partial discharge transient voltage detector. Embodiment 2 of the method for testing the performance of a partial discharge transient voltage detector is based on the following figure 1 The first embodiment of the system for testing the performance of the partial discharge transient ground voltage detector is shown. The linearity error of the transient ground voltage detector 6 is tested. The method includes:

[0066] S201, setting the frequency of the sinusoidal signal output by the sinusoidal signal generator 1 to be fixed at a certain frequency value between 3 MHz and 50 MHz.

[0067] S202, adjust the amplitude of the sinusoidal signal output by the sinusoidal signal generator 1 so that the response of the transient ground voltage detector 6 is greater than or equal to 30 dB, and record the peak voltage U of the sinusoidal signal generator 1 and the trans...

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Abstract

The invention provides a system and a method of measuring performance of a partial discharge transient state ground voltage detector. The system comprises a signal generator, a coaxial cable 2, a metal board, a matched resistor 4, a TEV (Transient earth voltage, transient state ground voltage) sensor 5, the transient state ground voltage detector 6 and a signal cable 7, wherein the signal generator is a sinusoidal signal generator 1 or a pulse signal generator 8, and the signal generator is connected with the metal board through the coaxial cable 2. The transient state ground voltage detector 6 is connected with the TEV sensor 5 through the signal cable 7, the TEV sensor 5 is tightly attached to the surface of the metal board which is grounded through the matched resistor 4, and the signal generator and the grounded end of the transient state ground voltage detector 6 are directed grounded. According to the fact that types or amplitudes or sizes of signals generated by the signal generator are regulated, linearity errors, pulse counting testing errors, stability errors and location functions of the transient state ground voltage detector 6 are tested. The test method is easy to achieve and simple and rapid to debug, and achieves process digitization.

Description

technical field [0001] The invention relates to the technical field of discharge fault detection for high-voltage power transmission and transformation equipment, in particular to a system and method for testing the performance of a partial discharge transient voltage detector. Background technique [0002] Partial discharge transient ground voltage detection method, as a live detection technology, has the advantages of convenient use and strong pertinence, and has been gradually promoted and used in domestic substations. Partial discharge transient ground voltage detector is generally used for partial discharge live detection or partial discharge state monitoring of AC metal-enclosed switchgear (referred to as switchgear). The partial discharge inside the switchgear will generate electromagnetic waves, form a skin effect on the metal wall and propagate along the metal surface, and at the same time generate a transient ground voltage on the metal surface. The magnitude of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00
Inventor 袁帅阎春雨毕建刚是艳杰杨宁吴立远王峰杨圆弓艳朋邓彦国孟楠
Owner CHINA ELECTRIC POWER RES INST
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