High-voltage power cable leakage current separation and detection method

A technology of leakage current and detection method, applied in the direction of voltage/current isolation, measurement of electricity, measurement device, etc., can solve the problems of cable line failure, cable aging easily, poor detection effect, etc.

Inactive Publication Date: 2019-09-10
武汉伏佳安达电气技术有限公司
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  • Application Information

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Problems solved by technology

[0004] The operation experience of a large number of XLPE cables shows that cable line faults are an important cause of power grid accidents. After the cables are put into use, they will not only be affected by electric field, mechanical and thermal effects, but also be affected by environmental factors. Under the action of the cable, the cable is prone to aging, and the thermal aging of the cable will great

Method used

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Example Embodiment

[0016] The seat of the present invention is further explained in conjunction with this embodiment.

[0017] A high-voltage power cable leakage current separation and detection method, comprising the following steps:

[0018] S1: Install current transformers and voltage transformers at the beginning and end of each phase of the three-phase power cable in advance. Three-phase alternating current is a form of electric energy transmission. Three-phase alternating current power is composed of three with the same frequency, The power supply composed of alternating potentials with equal amplitude and 120° phase difference in turn, three-phase alternating current has many uses, and most of the alternating current electrical equipment in the industry;

[0019] S2: For each phase of the three-phase power cable, obtain the head-end voltage measured by the head-end voltage transformer of the phase and the end voltage measured by the end voltage transformer of the phase. In S2, the three-p...

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Abstract

The invention discloses a high-voltage power cable leakage current separation and detection method which comprises the following steps of: S1: respectively mounting current transformers and voltage transformers at the head end and the tail end of each phase of a three-phase power cable in advance; S2: for each phase of the three-phase power cable, acquiring a head end voltage measured by the voltage transformer at the head end of the phase and a tail end voltage measured by the voltage transformer at the tail end of the phase; S3: rising an experimental voltage to 1.06 times of a rated workingvoltage of a detected object; S4: switching the phases, changing over a switch and respectively reading secondary readings; and S5: intercepting a relatively large value in the secondary readings asa detected leakage current value. According to the invention, by carrying out current separation and detection, the ageing condition of the cable is convenient to know, a case of causing a power gridaccident by cable ageing is avoided, detection efficiency is improved, meanwhile, detection steps are reduced, and a detection result is ensured.

Description

technical field [0001] The invention relates to the technical field of high-voltage power cables, in particular to a separation and detection method for leakage current of high-voltage power cables. Background technique [0002] Power cables are cables used to transmit and distribute electric energy. Power cables are often used in urban underground power grids, power station lead lines, internal power supply in industrial and mining enterprises, and underwater transmission lines across rivers and seas. In power lines, the proportion of cables is gradually increasing. Power cables are cable products used to transmit and distribute high-power electric energy in the backbone lines of power systems, including 1-500KV and above various voltage levels, various insulated power cables, and the basic structure of power cables consists of wire cores (conductors) ), insulation layer, shielding layer and protective layer. The power cable has less land occupation, high reliability, more ...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01R15/14
CPCG01R15/146G01R31/50
Inventor 周灏
Owner 武汉伏佳安达电气技术有限公司
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