XLPE power-cable partial discharge diagnosis method and system thereof

A partial discharge and power cable technology, applied in the direction of measuring electricity, measuring electrical variables, testing dielectric strength, etc., can solve the problems of inability to locate the partial discharge source, difficult to suppress, etc., to achieve the effect of easy live detection and avoid breakdown accidents

Active Publication Date: 2017-03-15
LIAOYANG POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY +2
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Problems solved by technology

The ultrasonic method is difficult to suppress the interference signal on site,

Method used

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  • XLPE power-cable partial discharge diagnosis method and system thereof
  • XLPE power-cable partial discharge diagnosis method and system thereof
  • XLPE power-cable partial discharge diagnosis method and system thereof

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Embodiment Construction

[0039] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0040] see figure 1, The system of the present invention is composed of an ultrasonic sensor and a UHF sensor (300MHz-3GHz), a signal amplification and conditioning unit, an acquisition card, a software analysis system and a display device. Wherein, the signal amplification and conditioning unit includes the signal amplification and conditioning unit of the ultrasonic sensor, the signal amplification and conditioning unit of the UHF sensor, wherein the signal amplification and conditioning unit of the ultrasonic sensor includes a preamplifier, a bandpass filter and a buffer circuit Three parts, the signal amplification and...

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Abstract

The invention belongs to the electric power equipment fault detection and diagnosis technology field and especially relates to an XLPE power-cable partial discharge diagnosis method and a system thereof. The method comprises the following steps of collecting a low-frequency ultrasonic wave signal and an ultrahigh-frequency partial discharge signal generated by power-cable partial discharge, acquiring time delay of the ultrasonic wave signal and acquiring a distance between a partial discharge point and a partial discharge detection point; determining a phase window which has partial discharge; establishing a relation between an ultrasonic wave signal amplitude of the phase window and a phase of an applied power frequency voltage; drawing ultrasonic partial discharge phase information and amplitude information into a phase spectrum graph; and carrying out statistics characteristic calculating and extracting 27 statistics operators representing a partial discharge characteristic. In the invention, the ultrahigh-frequency partial discharge signal generated by the partial discharge is taken as a time reference and is combined with a low-frequency ultrasonic partial discharge signal so as to acquire time delay of the ultrasonic signal, and finally identification of the partial discharge signal is realized.

Description

technical field [0001] The invention belongs to the technical field of fault detection and diagnosis of power equipment, and specifically relates to a method and system for diagnosing partial discharge of an XLPE power cable. Background technique [0002] Cross-Linked Polyethylene (XLPE) power cables are widely used in urban power grids due to their light weight, easy installation and laying, and good electrical and heat resistance properties. However, XLPE power cables in actual operation are affected by factors such as installation process, laying environment, external force damage, and use conditions, resulting in insulation defects and even insulation breakdown accidents. The proportion is more. [0003] At present, the domestic use of preventive tests is an important means to ensure the reliable operation of XLPE power cables. However, the preventive test has disadvantages such as long test period and blackout test results cannot accurately reflect the insulation stat...

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/1209G01R31/1272
Inventor 焦明航欧阳群焦明程刘树泽张琳高阳宋丽张诗洋黎斌贾煜晗
Owner LIAOYANG POWER SUPPLY COMPANY OF STATE GRID LIAONING ELECTRIC POWER SUPPLY
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