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Externally arranged ultrahigh frequency partial discharge detection sensor

A technology of partial discharge detection and ultra-high frequency, which is applied in the direction of testing dielectric strength, etc., can solve the problem that the detection effect of ultra-high frequency detection sensors is not very good, so as to avoid external interference, high sensitivity, and good signal-to-noise ratio Effect

Inactive Publication Date: 2013-06-12
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the actual measurement of the partial discharge signal spectrum, it is found that the frequency spectrum with high discharge signal intensity is between 500MHz and 3GHz, so the detection effect of the UHF detection sensor is not very good

Method used

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  • Externally arranged ultrahigh frequency partial discharge detection sensor
  • Externally arranged ultrahigh frequency partial discharge detection sensor
  • Externally arranged ultrahigh frequency partial discharge detection sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] like figure 1 and figure 2 As shown, the external UHF partial discharge detection sensor of the present invention includes a metal shielding shell 1 , a microstrip antenna 2 , a coaxial cable connector 3 and an integrated circuit board 4 . For ease of description, the figure 1 The center line A-A in defines the direction of up and down.

[0032] The shielding case 1 of this embodiment is a box shape with an open bottom consisting of a pair of short side walls 1a, a pair of long side walls 1b, and a top wall 1c connected to the short side walls 1a and the long side walls 1b. 1a is arranged adjacent to the long side wall 1b, wherein the lower bottom edge 1d of the long side wall 1b is an arc-shaped bottom edge, and the arc-shaped lower bottom edge 1d is concave upward from the lower edge of the long side wall 1b. The shape of the pot insulator is corresponding, so that it can be placed on the pot insulator during inspection. The short side wall 1a is a square structu...

Embodiment 2

[0039] The difference between this embodiment and Embodiment 1 is that: in this embodiment, the angle β between the coaxial probe feeder s and the microstrip antenna 2 is 5°. Figure 7 Be the standing wave ratio figure of the microstrip antenna of embodiment 2, by Figure 7 It can be seen that the microstrip antenna in this embodiment has a standing wave ratio below 2 in the frequency range of 1-4 GHz and a wide impedance bandwidth, which can well cover the useful detection frequency band of partial discharge.

Embodiment 3

[0041] The difference between this embodiment and Embodiment 1 is that: in this embodiment, the angle β between the coaxial probe feeder s and the microstrip antenna 2 is 10°. Figure 8 It is the standing wave ratio diagram of the microstrip antenna of embodiment 3. Depend on Figure 8 It can be seen that the microstrip antenna in this embodiment has a standing wave ratio below 2 in the frequency range of 1.75-4.2 GHz, and can better cover the useful detection frequency band of partial discharge.

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Abstract

An externally arranged ultrahigh frequency partial discharge detection sensor comprises a metal shielding outer shell, a microstrip antenna and a coaxial cable connector. The metal shielding outer shell is a box body with an opening at the bottom, and the lower bottom edge of the long side wall is arc-shaped. The microstrip antenna is arranged in the metal shielding outer shell and is a rectangular paster antenna. Long edges of a conductor paster are respectively provided with an inward concave arc notch, arc notches are symmetrically arranged using a geometric center of the conductor paster as a symcenter, the microstrip antenna is arranged in the metal shielding outer shell through a dielectric substrate, and an earth plate of the microstrip antenna is a metal shielding outer shell. An integrated circuit board is arranged in the metal shielding outer shell. A low noise amplifying circuit connected with the microstrip antenna, a detector circuit, an amplifying circuit which outputs signals through the coaxial cable connector, and a power supply circuit are arranged on the integrated circuit board. The externally arranged ultrahigh frequency partial discharge detection sensor integrates the microstrip antenna, the integrated circuit board and the shielding outer shell, and is high in sensitivity, small in signal distortion, good in signal-to-noise ratio characteristic, and capable of keeping characteristic information of partial discharge signals to the maximum limit.

Description

technical field [0001] The invention belongs to the technical field of partial discharge detection of high-voltage power equipment, and in particular relates to an external UHF partial discharge detection sensor for detecting internal partial discharge of gas insulated switchgear (GIS for short). Background technique [0002] In the high-voltage power system, due to the inevitable defects in the manufacturing process, transportation and assembly process, such as the introduction of dust, conductive particles or metal tips and holes formed in the equipment, it is easy to cause various forms of partial discharge in the power system, As a result, the insulation breakdown of high-voltage equipment will cause the power system to fail and cause losses to the national economy. Therefore, accurate detection and measurement of partial discharge phenomena is a vital link to ensure the normal operation of the power system. [0003] The electrical signal of partial discharge has a wide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 郭宏福付咪梅晓云杨超
Owner XIDIAN UNIV
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