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Device and method for improving partial discharge detection sensitivity of power distribution cable

A technology for partial discharge detection and power distribution cables, which can be applied to measuring devices, testing dielectric strength, measuring current/voltage, etc. The effect of noise ratio

Inactive Publication Date: 2021-01-22
GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing partial discharge detection results that are easily disturbed and the detection effect is poor, and provide a device for improving the detection sensitivity of distribution cable partial discharge

Method used

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  • Device and method for improving partial discharge detection sensitivity of power distribution cable
  • Device and method for improving partial discharge detection sensitivity of power distribution cable
  • Device and method for improving partial discharge detection sensitivity of power distribution cable

Examples

Experimental program
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Embodiment 1

[0039] Such as Figure 1 to Figure 2 Shown is an embodiment of a device for improving the detection sensitivity of distribution cable partial discharge according to the present invention. A device for improving partial discharge detection sensitivity of distribution cables, which includes A-phase HFCT1, B-phase HFCT2, and C-phase HFCT3, and also includes A-phase conditioning circuits and B-phase conditioning circuits connected to A-phase HFCT1, B-phase HFCT2, and C-phase HFCT3. The phase conditioning circuit and the C phase conditioning circuit also include sequentially connected analog-to-digital converter A / D, random access memory DDR, programmable gate array FPGA and microprocessor ARM, A phase conditioning circuit, B phase conditioning circuit and C phase conditioning The circuits are all connected with the analog-to-digital converter A / D, and the microprocessor ARM is also connected with the random access memory DDR.

[0040] In this embodiment, the detection frequency b...

Embodiment 2

[0045] This embodiment is similar to Embodiment 1, the difference is that this embodiment is used in conjunction with the high voltage generator 7, such as figure 2 As shown, when performing offline detection of cable partial discharge, open the high-voltage room of the cable terminal of the switch cabinet, unsheath the wire cores of the three-phase cables, connect the high-voltage generator 7 through the high-voltage line 4, and connect the high-voltage generator 7 The ground wire 6 is connected to the grounding bar of the switch cabinet, and the A-phase HFCT1, B-phase HFCT2 and C-phase HFCT3 are respectively installed on the cores of the three-phase cables, and the output signal of the HFCT sensor is connected to the signal acquisition and The processing unit, the signal acquisition and processing unit uploads the detection result to the high voltage generator 7 through the data line 5 .

[0046] In this embodiment, the signal acquisition and processing unit includes an A-p...

Embodiment 3

[0049] Such as image 3 Shown is an embodiment of a method for improving the detection sensitivity of distribution cable partial discharge according to the present invention. A method for improving the detection sensitivity of partial discharge of distribution cables, comprising the following steps:

[0050] S1. Connect A-phase HFCT, B-phase HFCT and C-phase HFCT to three-phase cables to collect partial discharge signals in the cables;

[0051] S2. A-phase conditioning circuit, B-phase conditioning circuit and C-phase conditioning circuit amplify and filter the partial discharge signals collected by A-phase HFCT, B-phase HFCT and C-phase HFCT, and perform digital conversion through analog-to-digital converter A / D;

[0052] S3. Random access memory DDR and programmable gate array FPGA store the converted digital signal and form a sequence;

[0053] S4. The microprocessor ARM performs differential calculation on the sequence, and judges the source of the partial discharge sign...

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Abstract

The invention provides a device for improving the partial discharge detection sensitivity of a power distribution cable. The device comprises an A-phase HFCT, a B-phase HFCT and a C-phase HFCT, also comprises an A-phase conditioning circuit, a B-phase conditioning circuit and a C-phase conditioning circuit which are correspondingly connected with the A-phase HFCT, the B-phase HFCT and the C-phaseHFCT, and also comprises an analog-to-digital converter A / D, a random access memory DDR, a programmable gate array FPGA and a microprocessor ARM which are connected in sequence, wherein the A-phase conditioning circuit, the B-phase conditioning circuit and the C-phase conditioning circuit are all connected with the analog-to-digital converter A / D, and the microprocessor ARM is further connected with the random access memory DDR. The invention further provides a method for improving the partial discharge detection sensitivity of the power distribution cable. According to the invention, the efficiency, the signal-to-noise ratio and the sensitivity of partial discharge offline detection can be significantly improved, and the accuracy of partial discharge detection is improved.

Description

technical field [0001] The present invention relates to the technical field of partial discharge detection, and more specifically, to a device and method for improving the detection sensitivity of partial discharge of distribution cables Background technique [0002] Distribution cables are power equipment that realize long-distance transmission of distribution network energy, and their reliability directly affects the power consumption of an area. Due to the increase in service life, improper construction department and external force damage, etc., cable failures and even explosions are often caused. According to incomplete statistics, more than 90% of cable failures are insulation failures. Therefore, it is very important to carry out cable insulation state detection. [0003] At present, partial discharge detection is the most common and effective way to evaluate the cable insulation state. The partial discharge detection of cables is mainly divided into offline detecti...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R19/25
CPCG01R19/2506G01R31/1272
Inventor 郭小凯孙廷玺林钰灵崔江静梁育雄傅国强吴宏晓方义治颜源李洪杰甘露
Owner GUANGDONG POWER GRID CO LTD
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