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Detection and evaluation device and method for partial discharge of direct current XLPE cables

A technology of partial discharge detection and partial discharge, which is applied in the direction of testing dielectric strength, etc., can solve the problems of discharge complexity and influence, and achieve the effect of ensuring accuracy

Active Publication Date: 2015-06-17
XI AN JIAOTONG UNIV +1
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Problems solved by technology

[0024] The change of the local field strength at the discharge location will mainly be reflected in the change of the discharge repetition rate, and due to the thermal effect of the electric field, the change of the electric field will in turn cause the change of the temperature, resulting in the coupling relationship between the electric field and temperature, which is complicated for the discharge. Impact

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  • Detection and evaluation device and method for partial discharge of direct current XLPE cables
  • Detection and evaluation device and method for partial discharge of direct current XLPE cables
  • Detection and evaluation device and method for partial discharge of direct current XLPE cables

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Embodiment Construction

[0060] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0061] see figure 1 , the present invention provides a method for detecting and analyzing the combined partial discharge temperature of XLPE DC cables. Compared with AC partial discharge signals, DC partial discharge signals have significant differences such as low discharge repetition rate and no phase angle corresponding to discharge pulses. Therefore, in The invention adopts 30-60min long-time DC partial discharge measurement, and adopts Q-t diagram mainly combined with new three-dimensional common H(Q, Δt) suitable for DC partial discharge analysis for pattern recognition. Since the distribution of the electric field in the insulation depends on the distribution of the resistivity under DC, the resistance will change significantly with the change of temperature, thereby affecting the distribution of the electric field at the place, and the change of the local fiel...

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Abstract

The invention discloses a detection and evaluation device and method for partial discharge of direct current XLPE cables. The detection and evaluation device comprises a detected cable and a direct current partial discharge detection device used for acquiring partial discharge signals. The two ends of the detected cable are connected with a direct current high-voltage output device and a current output device. A temperature detecting device is arranged on the detected cable. According to the detection and evaluation device and method, the means suitable for alternating current partial discharge detection and analysis is adopted according to the difference of direct current partial discharge and alternating current partial discharge, and the blank of a direct current partial discharge detection and analysis method is filled. The influence of temperatures on particle discharge is considered, the comprehensive analysis mode that the measurement result of partial discharge measurement which is conducted in the state of simulating cable no-load or being in an offline state under the normal temperatures and the measurement result of partial discharge measurement which is conducted of simulating the cable in an on-load state by the current output device are combined is adopted, and the insulation condition of the cable is more comprehensively evaluated.

Description

technical field [0001] The invention relates to a detection and evaluation device and method for partial discharge of a DC XLPE cable. Background technique [0002] Cross-linked polyethylene (XLPE) power cables are widely used in power systems due to their simple structure, strong load capacity, easy laying, convenient operation and maintenance, excellent insulation performance, and simple production process. With the wide application of XLPE cable lines, the use of intermediate connectors as an important part of power cables has also increased. However, the cable intermediate joint is also a frequent site of transmission line accidents, and its reliability directly affects the safety of the power supply system. Due to various factors such as inferior materials, rough manufacturing process, irregular installation on site, and electrical, thermal, and mechanical stresses, the intermediate joints of cables will form latent insulation defects, which will bring potential safety...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
Inventor 徐阳康强陈浩
Owner XI AN JIAOTONG UNIV
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