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Partial discharge detection method based on frequency-division sampling

A partial discharge detection and partial discharge pulse technology, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as the acquisition and analysis of local pulse signals that cannot be accidental, and achieve the effect of saving storage space

Inactive Publication Date: 2018-05-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that existing partial discharge detection methods cannot collect and analyze occasional local pulse signals, this application provides a partial discharge pulse signal detection method based on frequency division sampling

Method used

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  • Partial discharge detection method based on frequency-division sampling
  • Partial discharge detection method based on frequency-division sampling
  • Partial discharge detection method based on frequency-division sampling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] combine image 3 The parallel impedance measurement circuit diagram is shown, in which, 1 is the GIS equipment, U is the high-voltage test power supply, and C c is the coupling capacitance, R is the isolation resistance, Z is the partial discharge detection impedance and the coupling capacitance C c series, when the insulation defect C d When a partial discharge occurs, the partial discharge pulse current passing through Z generates a pulse voltage drop for partial discharge signal sensing. exist image 3 , when the insulation defect C d When partial discharge occurs, the pulse current of partial discharge has two loops: loop 1 is C d -C p -C s , this loop does not pass through the detection impedance Z; loop 2 is C d -C c -Z-C s , the loop passes through the detection impedance Z, and a voltage drop is generated on Z.

[0029] In the partial discharge detection method provided in this application, a BNC coaxial cable is used to sense the voltage drop on Z, an...

Embodiment 2

[0037] see Figure 4 As shown, it is a schematic flow chart of a partial discharge detection method based on frequency division sampling provided by this application, which specifically includes the following steps:

[0038] S101. Collect the voltage drop across the partial discharge detection impedance;

[0039] S102. Input the voltage drop into the input terminal of the oscilloscope;

[0040] S103. Setting the sampling rate and trigger condition of the oscilloscope;

[0041] S104. The output terminal of the oscilloscope displays a partial discharge pulse signal.

[0042] Optionally, the sampling rate of the oscilloscope is 50 MS / s to 500 MS / s, and the trigger condition of the oscilloscope is pulse rising edge trigger.

[0043] Optionally, the trigger level of the oscilloscope needs to cooperate with the detection impedance and the amplifier.

[0044] Optionally, the trigger level of the oscilloscope is set to be 5 to 8 times the amplitude of the background noise on site,...

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Abstract

The invention relates to the technical field of partial discharge detection, in particular to a partial discharge detection method based on frequency-division sampling. The partial discharge detectionmethod comprises the following steps of collecting voltage drop at both ends of a partial discharge detection impedance; inputting the voltage drop into an input end of an oscilloscope; setting the sampling rate and triggering conditions of the oscilloscope; displaying a partial discharge pulse signal at the output end of the oscilloscope. The partial discharge detection method has the advantagesthat by setting the sampling rate and triggering conditions of the oscilloscope, the input end of the oscilloscope only collects the occasional partial discharge pulse signal, so as to conveniently summarize and analyze the characteristics of the occasional partial pulse; by setting the sampling rate and triggering conditions of the oscilloscope, the input end of the oscilloscope does not need toalways collect the pulse signal, and the collection is only triggered when the occasion pulse occurs, so that an industrial personal computer with larger memory for always collecting in real time isnot needed, and only one oscilloscope is required, thereby saving the storage space of the collection equipment.

Description

technical field [0001] The present application relates to the technical field of partial discharge detection, in particular to a partial discharge detection method based on frequency division sampling. Background technique [0002] Partial Discharge (PD) detection is considered to be the most important and effective insulation state assessment method among GIS operation reliability monitoring methods, and a lot of research has been done in the diagnosis and evaluation of GIS insulation parts before leaving the factory and GIS insulation state. and apply. During the long-term operation of GIS, it may suffer from factors such as external force, heavy load, and high temperature to damage the insulation performance of the equipment. Partial discharge of electrical facilities in the power grid is a common phenomenon. Partial discharge is a precursor to the deterioration of GIS insulation. If it is not found in time, Treatment, the escalation of electrical damage caused by discha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1254
Inventor 李传扬刘卫东林川杰何金良胡军杨勇
Owner TSINGHUA UNIV