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Mobile device for detecting local discharging of electric equipment of substation, and positioning method

A partial discharge detection, mobile substation technology, applied in the direction of testing dielectric strength, etc., can solve the problem of monitoring device maintenance and management that consume a lot of time and manpower, difficult to adapt to remote management of smart substations, few people on duty, partial discharge faults, etc. problems, to achieve fast and convenient detection, improve the level of intelligence, and reduce power outages.

Inactive Publication Date: 2012-05-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of monitoring idea has the following defects: any high-voltage power equipment in the substation may have a partial discharge fault. If you want to monitor the primary electrical equipment in the whole station, you need to install a partial discharge monitoring device on each equipment. It takes a lot of time and financial resources to purchase and install equipment; it needs to carry multiple sets of different types of instruments during the test, which is inconvenient to operate; the maintenance and management of many monitoring devices also takes a lot of time and manpower
This form of monitoring is difficult to adapt to the remote management of smart substations and few people on duty in the future.

Method used

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  • Mobile device for detecting local discharging of electric equipment of substation, and positioning method
  • Mobile device for detecting local discharging of electric equipment of substation, and positioning method
  • Mobile device for detecting local discharging of electric equipment of substation, and positioning method

Examples

Experimental program
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Effect test

Embodiment 1

[0077] Example 1: Laboratory Testing and Validation

[0078] The laboratory simulation verifies the positioning algorithm and the antenna placement space position is as follows: Figure 5 As shown in the coordinate points A, B, C, and D in the figure, the antenna is on the same plane and placed on the four vertices of the rectangle; the position of point P of the simulated discharge source is (0.35, 3.86, 2.28) m, and the bandwidth used is 2 GHz. A high-speed digital oscilloscope with a sampling rate of 10G sps is used for signal acquisition, and the bandwidth of the antenna used is 200M-2GHz. Using the above positioning algorithm, the positioning results are shown in Table 1.

[0079] Table 1 positioning results

[0080] x(m)

[0081] The average position of the six groups of positioning results in Table 1 is (0.35, 4.02, 243) m, while the actual position of point P of the simulated discharge source is (0.35, 3.86, 2.28) m, and the absolute error is (0.00, 0.16, 0...

Embodiment 2

[0082] Example 2: Field Application Verification

[0083] In order to verify the effect of the system running in the field strong interference environment, a systematic test experiment was carried out in a 500kV substation. The field test scene is as follows: Figure 5 As shown, the UHF antenna is installed on a movable bracket, and the coordinates of the antenna after installation are as follows Image 6 shown, and a simulated discharge source was fabricated for verification. The oscilloscope collected the UHF electromagnetic wave signal data from the discharge source. After system processing and analysis and positioning algorithm calculation, the location coordinate of the discharge source was (5.46, 0.68, 0.58) m, while the real position of the actual simulated discharge source was about (5.3, 0.7, 0.6) m or so, the error is within 2%, which meets the requirement of partial discharge positioning accuracy in the whole substation.

[0084] Experiments show that the inventio...

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Abstract

The invention relates to a mobile device for detecting local discharging of electric equipment of a substation, and a positioning method. The detecting device is mounted on mobile equipment and is composed of an antenna matrix, an ultra high-speed data sampling unit and a data processing unit. The positioning method comprises the following steps: using an ultra-high frequency (UHF) antenna to receive an ultra-high frequency electromagnetic wave generated by to-be-detected local discharging of the electric equipment of the substation; after performing amplifying and filtering treatment on the ultra-high frequency electromagnetic wave by a prepositioned broadband amplifier, synchronously sampling by virtue of the ultra high-speed data sampling unit, sending to the data processing unit and performing data processing on a four-way signal; and displaying the position of a local discharging source and early warning information on a display screen. The detecting device and positioning method provided by the invention can be used for thoroughly detecting and positioning the local discharging of all equipment in the substation; the detecting cost of the local discharging of the equipment in the substation is greatly lowered; the defects can be early found while the substation is subjected to routing inspection; power-off accidents are reduced, thereby increasing the intelligent level of the substation; and the detecting device and the positioning method have the characteristics of low cost and high efficiency and can quickly detect and position the local discharging of the whole to-be-detected substation.

Description

technical field [0001] The invention relates to a high voltage and insulation technology of a power system, in particular to a partial discharge detection device and a positioning method of power equipment in a mobile substation. Background technique [0002] Insulation fault is one of the most important possible faults in the operation of power equipment. Before the insulation fault of power equipment occurs, there will generally be a gradual partial discharge process, which will eventually lead to insulation breakdown. If partial discharge monitoring and diagnosis of operating equipment can be carried out during this process, partial discharge signals can be detected in time, and defects can be dealt with in advance, so that the occurrence of insulation breakdown faults can be effectively avoided. The positioning of the partial discharge location is also helpful to formulate a more targeted maintenance treatment plan, reduce power outage time, and improve maintenance effic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 盛戈皞侯慧娟胡岳刘亚东叶海峰张天辰司良齐江秀臣
Owner SHANGHAI JIAO TONG UNIV
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