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On-line early warning method of failure of cross-linked polyethylene power cable

A cross-linked polyethylene, power cable technology, applied in the direction of the fault location, etc., to achieve the effect of facilitating early or planned maintenance, reducing economic losses, and flexible system configuration

Active Publication Date: 2012-04-04
淄博文广电气有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 2. Loss current harmonic component method
[0016] In summary, for cross-linked polyethylene (XLPE) power cables, the existing online detection methods have their own limitations

Method used

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  • On-line early warning method of failure of cross-linked polyethylene power cable
  • On-line early warning method of failure of cross-linked polyethylene power cable
  • On-line early warning method of failure of cross-linked polyethylene power cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as figure 1 As shown, the power supply 8, transformer 7, switch 9, arc suppression coil 10, bus bar 6, cross-linked polyethylene (XLPE) power cable 4 and load 11 form a commonly used power cable power supply model of a small current system. A cross-linked polyethylene (XLPE) power cable 4 is provided with grounding points 5 , 12 . On the cross-linked polyethylene (XLPE) power cable 4 running on the grid that is not grounded or grounded through the arc suppression coil, a high-frequency current sensor 1 is connected, and the metal shielding layer of the cross-linked polyethylene (XLPE) power cable 4 is grounded The conductor 3 passes through the high-frequency current sensor 1, and the output terminal of the high-frequency current sensor 1 is connected to 2. The online early warning device 2 is composed of an ultra-high-speed signal acquisition and data processing system and the like.

[0048] Through real-time online detection and recording of the transient electr...

Embodiment 2

[0070] The analysis and processing described in step 3 of the present invention includes the transient electromagnetic transient signal

[0071] (1) Perform signal conditioning and analog-to-digital conversion, and store;

[0072] (2) Compare the intensity and waveform shape of the instantaneous electromagnetic transient signal with specific criteria to identify the signal of malfunction;

[0073] (3) Record the number of "recoverable faults" through the instantaneous electromagnetic transient signal, and display and alarm if the number of times is close to a specific criterion.

[0074] Step (2) and step (3) are manually identified and operated.

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Abstract

The invention relates to an on-line early warning method for failure of a cross-linked polyethylene power cable, belonging to the field of on-line monitoring of power cables and comprising a cross-linked polyethylene power cable to be detected. The on-line early warning method for failure of the cross-linked polyethylene power cable is characterized in that when restorable failure of a certain cross-linked polyethylene power cable to be detected is detected and recorded on line in real time, an instantaneous electromagnetism transient signal flowing through a metal shielding layer earthing conductor of the power cable to be detected is generated, and the instantaneous electromagnetism transient signal is analyzed by utilizing a specific criterion so as to make an early warning for the power cable to be detected. By adopting the on-line early warning method of the restorable failure of the power cable, on-line early warning is performed on the restorable failure before the cable is damaged, which is beneficial for the power supply departments to overhaul in advance or in a planned way, avoiding sudden failure of the cable to cause power failure, reducing economic loss caused by thepower failure and adverse effect brought for enterprise production and people's life, and improving the reliability of the power supply.

Description

technical field [0001] The invention belongs to the field of online monitoring of power cables, and the monitored power cables are cross-linked polyethylene (XLPE) power cables of various voltage levels running in a small current system, specifically an online early warning of XLPE power cable failures method Background technique [0002] Cables used for power transmission and distribution are called power cables. With the progress of society and the development of industrial and agricultural production, the proportion of cable consumption in the entire power transmission line is increasing. Compared with overhead lines, cables have the following main advantages: [0003] 1. High reliability of power transmission, not easily affected by the surrounding environment and pollution; [0004] 2. The insulation distance between lines is small, occupying less land, and no interference to radio waves; [0005] 3. When laying underground, it does not occupy the ground and space, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 王广柱魏洪文张立斌
Owner 淄博文广电气有限公司
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