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In-situ detecting method for partial discharge of damped oscillation wave of large-length ultrahigh voltage crosslinked cable

A technology of damping oscillating waves and cross-linked cables, which is applied in the direction of measuring electricity, measuring devices, testing circuits, etc., can solve problems such as inability to meet detection requirements, achieve the effect of improving cable status detection methods and improving operational reliability

Inactive Publication Date: 2013-02-06
CHINA ELECTRIC POWER RES INST
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  • Abstract
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Problems solved by technology

However, the invention still has the above defects and cannot solve the detection requirements under large lengths

Method used

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  • In-situ detecting method for partial discharge of damped oscillation wave of large-length ultrahigh voltage crosslinked cable
  • In-situ detecting method for partial discharge of damped oscillation wave of large-length ultrahigh voltage crosslinked cable
  • In-situ detecting method for partial discharge of damped oscillation wave of large-length ultrahigh voltage crosslinked cable

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Embodiment Construction

[0029] In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the examples, but the content of the present invention is not limited to the following examples. Those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms are also within the scope of the claims listed in this application.

[0030] Notes in the figure, 1-DC excitation oscillating voltage generator, 2-resistor-capacitance voltage divider, 3-cable line terminal, 4-terminal grounding wire, 5-cable line intermediate connector, 6-phase separation of connector Directly connected copper bars, 7-cable line and cable body, 8-high-frequency pulse current coupling sensor, 9-portable high-frequency partial discharge detector, 10-oscilloscope, 11-distributed high-frequency partial discharge monitoring system (including pre-stage acquisition unit).

[0031] The on-site detection method...

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Abstract

The invention provides an in-situ detecting method for partial discharge of a damped oscillation wave of a large-length ultrahigh voltage crosslinked cable. According to the method, a damped oscillation wave voltage of which the attenuation period is 300mS is adopted to take the place of a power frequency sine-wave voltage to be used as an excitation voltage for testing the partial discharge in a cable line having potential insulation defects; during a voltage boosting process, the partial discharge testing mode is changed into an electrified detection or distributed monitoring mode that the off-line single end fixation measurement is changed into a mode of measuring along middle joints of the line; for signal pickup, a high frequency pulse current coupling sensor is clamped on a cable metal sleeve outtake line so as to take the place of a coupling capacitor and a detection impeder which are connected with a cable terminal in parallel; for data processing, a PD quantity value is calculated by using a pulse current frequency domain integration method. With the adoption of the method, a technical support for diagnosing the defects of ultrahigh voltage crosslinked cable lines and evaluating the insulation states of the cables is provided, the cable state detection means is further enriched and completed for cable operation and maintenance units, and powerful guarantee for improving the operation reliability of the cable lines is provided.

Description

technical field [0001] The invention belongs to the technical field of power cable state detection, and relates to a method for on-site partial discharge detection of large-length high-voltage and ultra-high-voltage cross-linked cable lines, which is suitable for voltage levels of 110 (66) kV to 500 kV. Background technique [0002] With the continuous transformation of my country's urban power grids, cross-linked polyethylene (XLPE, hereinafter referred to as XLPE) cables, as the mainstream product of power cable engineering, have been widely used in urban power transmission and distribution lines. In the past ten years, the laying circuit length of cross-linked cables has grown steadily at an average annual growth rate of more than 15%. High-voltage and ultra-high-voltage cross-linked cables have become an important part of my country's power grid, and have large lengths (the longest 220kV cable line in China is 17.77km) and large cross-sections (the maximum cross-sectiona...

Claims

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/14G01R31/58
Inventor 夏荣赵健康蒙绍新
Owner CHINA ELECTRIC POWER RES INST
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