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A new type of power cable partial discharge on-line monitoring system

A partial discharge and power cable technology, applied in the direction of testing dielectric strength, etc., can solve the problems of poor accuracy, poor versatility, and high cost, and achieve the effects of improving accuracy, reducing acquisition costs, and good real-time performance

Active Publication Date: 2016-01-20
STATE GRID CORP OF CHINA +2
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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 problems of real-time and poor accuracy, high cost and poor versatility of partial discharge data collection in the existing power cable partial discharge monitoring technology, thereby providing a low-cost, high reliability, real-time and high Universal On-Line Monitoring System for Power Cable Partial Discharge

Method used

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  • A new type of power cable partial discharge on-line monitoring system
  • A new type of power cable partial discharge on-line monitoring system
  • A new type of power cable partial discharge on-line monitoring system

Examples

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Embodiment 1

[0045] A kind of novel power cable partial discharge on-line monitoring system of an embodiment of the present invention, such as figure 1 As shown, it includes n monitoring nodes, 1 central node and 1 data management platform. in,

[0046] The n monitoring nodes are installed in n monitoring areas of the power cable, and after the n monitoring nodes collect the partial discharge data of their respective monitoring areas, the partial discharge data are sent to the central node through wireless communication . n is an integer greater than or equal to 1.

[0047] Described monitoring node further comprises UHF sensor 4, feeder and waterproof N head; Wherein, see Figure 4 As shown, the UHF sensor 4 is a sheet sensor, which is formed on the outer surface of the annular insulating layer 3 of the XLPE power cable accessory by seamless welding. Wherein, the XLPE power cable accessory includes an inner semiconductive layer 2, an insulating layer 3 and two outer semiconductive lay...

Embodiment 2

[0059] Such as figure 2 As shown, as a specific implementation manner of the present invention, on the basis of the above-mentioned embodiments, the monitoring node further includes a partial discharge data acquisition module, a first ZigBee module, and a first power supply module. in,

[0060] The partial discharge data acquisition module is connected to the UHF sensor 4 through an outgoing cable, receives the partial discharge signal sent by the UHF sensor 4, processes the partial discharge signal to obtain partial discharge data, and sends the partial discharge signal The partial discharge data is sent to the first ZigBee module.

[0061] The first ZigBee module receives the partial discharge data sent by the partial discharge data acquisition module, and sends the partial discharge data to the central node.

[0062] The first power supply module supplies power to the partial discharge data acquisition module and the first ZigBee module.

Embodiment 3

[0064] Such as image 3 As shown, on the basis of the above-mentioned embodiments, the central node further includes a second ZigBee module, a first mobile communication module and a second power supply module.

[0065] in,

[0066] The second ZigBee module is configured to receive the partial discharge data sent by the first ZigBee interface, and send the partial discharge data to the first mobile communication module.

[0067] The first mobile communication module is configured to receive the partial discharge data sent by the second ZigBee interface, and send the partial discharge data to the data management platform.

[0068] The second power supply module supplies power to the second ZigBee module and the first mobile communication module.

[0069] The ZigBee module is used for communication between the monitoring node and the central node. The ZigBee module has the advantages of low power consumption and free communication, which can greatly increase the service time o...

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Abstract

The invention relates to a novel power cable partial discharge online monitoring system. Since wireless transmission is adopted among monitoring nodes, a center node and a data management platform, the novel power cable partial discharge online monitoring system has the advantages of high reliability, good real-time performance and low cost. Every UHF sensor is formed on an outer surface of an annular belt-shaped insulation layer in the method of seamless welding, and is in favor of transmission of ultra-high frequency signals, improves accuracy of partial discharge monitoring, and prevents original insulation performance and electric field distribution of an XLPE power cable accessory from getting damaged. The UHF sensor is a flake-shaped sensor, can be cut and installed in the field according to the thickness of the XLPE power cable accessory, and thus has wide application scope. Furthermore, one end of a feed line is connected with the UHF sensor, and the other end of the feed line is connected with a waterproof N-joint which is used for connecting partial discharge detection equipment. In actual operation process, the waterproof N-joint facilitates the installation and dismounting of the partial discharge detection equipment.

Description

technical field [0001] The invention relates to a novel on-line monitoring system for partial discharge of electric cables, which belongs to the technical field of partial discharge monitoring for electric cables. Background technique [0002] Compared with the traditional overhead line power supply, the power cable power supply has the advantages of not being affected by the external environment, saving land, and good electrical performance. With the development of urban power grids, the utilization rate of power cables continues to increase, and the reliability of cable operation has attracted the attention of the power sector. There are many reasons for cable failures. Statistical analysis of cable failures found that most of the failures occurred in the intermediate joints and terminal heads of cables and the surrounding areas. Especially the intermediate joints need to be made on site, which requires high production and is more likely to cause accidents. , the intermed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
Inventor 时翔赵生传徐强江川蔡健牟磊崔潇齐蔚海蓝先明王德东李志戈唐志国
Owner STATE GRID CORP OF CHINA
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