Cable oscillatory wave partial discharge detection system shielding device

A technology of partial discharge detection and shielding device, applied in shielding device, testing dielectric strength and other directions, can solve the problem that the cable oscillating wave partial discharge detection system is susceptible to electromagnetic interference and other problems, so as to reduce the generation of internal interference electromagnetic waves and avoid electromagnetic wave interference , the effect of increasing the amount of overlap

Active Publication Date: 2013-05-08
STATE GRID SHANDONG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is the problem that the cable oscillating wave partial discharge detection system is susceptible to electromagnetic interference in the prior art, so as to provide a shielding device for the cable oscillating wave partial discharge detection system

Method used

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  • Cable oscillatory wave partial discharge detection system shielding device

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Embodiment 1

[0031] A shielding device of a cable oscillatory wave partial discharge detection system according to the present invention, such as figure 1 shown, which includes,

[0032] A shielding box 1, the shielding box 1 includes a shielding box body and a cover plate (not shown in the figure), the shielding box body includes an isolation plate 10, and the shielding box 1 is an iron box, wherein the low A pass filter 121, a switching power supply 120, a detection impedance 110, an amplifier 112 and an acquisition card 111 are placed in the shielding box 1, and the shielding box body is divided into a first shielding area 11 and a second shielding area 11 by the isolation plate 10. Shielding area 12, the switching power supply 120 and the low-pass filter 121 are arranged in the second shielding area 12, and the amplifier 112, the acquisition card 111 and the detection impedance 110 are arranged in the first shielding area Zone 11, the thickness of the iron box is 2mm; the cover plate ...

Embodiment 2

[0041] As other implementation manners, in the first embodiment, the power lines and signal lines in the shielding box 1 are routed separately, the power lines and the signal lines are not arranged in parallel, and the lengths of the power lines and signal lines are less than 10 cm.

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Abstract

The invention relates to a cable oscillatory wave partial discharge detection system shielding device which comprises a shielding box provided with an amplifier, a collecting card, detection impedance, a switch power and a low pass filter inside. The shielding box is made of a steel plate with the thickness of 2 mm and capable of preventing components inside the shielding box from being interfered by outer electromagnetic waves. The low pass filter is an electro-magnetic interference (EMI) difference module bipolar filter. Due to the fact that all the components of the system are grounded to one point of the shielding box body, coupled circuits of common impedance can be reduced and internal interference electromagnetic wave can be reduced. During the process of wiring, the power line and the signal line are unparallel and controlled with 10 centimeters, capacitance of the coupled circuits is effectively reduced, high frequency interference signal paths can be avoided, and the interference electromagnetic waves can be further reduced.

Description

technical field [0001] The invention relates to a shielding structure for electromagnetic interference signals, in particular to a shielding device for a cable oscillatory wave partial discharge detection system, which belongs to the technical field of cable oscillatory wave detection. Background technique [0002] There are three main detection methods for cable partial discharge: 1. Cable partial discharge detection under power frequency voltage; 2. Cable partial discharge detection under ultra-low frequency voltage; 3. Cable partial discharge detection under DC damped oscillation voltage; method 1 , due to the large capacitance of the power cable, it is difficult to carry out partial discharge detection under power frequency voltage on site; the method 2 requires a long test time, which will damage the cable insulation and cause new defects in the cable; among them Method 3, due to the high insulation resistance of XLPE (cross linkedpolyethylene, cross-linked polyethylene...

Claims

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Application Information

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IPC IPC(8): G01R1/18G01R31/12
Inventor 时翔武志刚王华广董啸刘明林房牧赵辰宇左新斌
Owner STATE GRID SHANDONG ELECTRIC POWER
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