Discharging device and discharging method for submarine oil-filled cable direct-current withstand voltage test

A technology of withstand voltage test and oil-filled cable, applied in corona discharge devices, measuring devices, circuits, etc., can solve the problems of low reliability of discharge devices, high maintenance costs, long discharge time, etc., to reduce the risk of electric shock, improve Efficiency and time reduction effect

Inactive Publication Date: 2020-01-14
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of long discharge time, low reliability and high maintenance cost of the existing discharge device for the DC withstand vol...

Method used

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  • Discharging device and discharging method for submarine oil-filled cable direct-current withstand voltage test
  • Discharging device and discharging method for submarine oil-filled cable direct-current withstand voltage test
  • Discharging device and discharging method for submarine oil-filled cable direct-current withstand voltage test

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Embodiment Construction

[0036] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] Such as figure 1 As shown, a discharge device for DC withstand voltage test of submarine oil-filled cables, including discharge car 1, pressure equalizing cover 2, pull rod 3, miniature electric hoist 4, discharge resistor 5, pull rope 6, fixed pulley 7 and high-voltage wire 22 .

[0038] During the DC withstand voltage test, the connection relationship between the submarine cable, the voltage divider and the DC high voltage generator is as follows: Figure 6 As shown, in order to improve the reliability of the test system, two voltage dividers 8 were placed during the test, and the two voltage dividers 8 were respectively placed between the terminals 30 of the three-phase submarine cable. The voltage divider 8 and the DC...

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Abstract

The invention discloses a discharging device for submarine oil-filled cable direct-current withstand voltage test. The discharging device comprises a discharging vehicle, a pull rod, a discharging resistor, a transmission device and a high-voltage wire. The discharging vehicle comprises a discharging tip, a universal ball, a pulley and a vehicle body, wherein the pulley is installed on the side face of the vehicle body and is in rolling connection with the pull rod; the universal ball is rotationally installed at the upper end of the vehicle body; the discharging tip is fixed to the universalball; and the transmission device is used for driving the discharging vehicle to slide along the pull rod to make the discharging tip contacted with or separated from equipment to be discharged. The invention also discloses a discharging method for the submarine oil-filled cable direct-current withstand voltage test. The discharging device and the discharging method can quickly release the residual charges accumulated on the tested equipment body, so that the efficiency of the withstand voltage test is effectively improved, and the safety of the withstand voltage test is ensured.

Description

technical field [0001] The invention relates to the technical field of direct-current withstand voltage test of submarine cables, in particular to a discharge device and a discharge method for direct-current withstand voltage test of submarine oil-filled cables. Background technique [0002] When the submarine oil-filled cable is put into operation, it is necessary to conduct a DC withstand voltage test on the cable. This test is the main method for evaluating the insulation performance of the cable and its ability to withstand overvoltage, and can effectively detect local defects such as mechanical damage and damp media of the cable. However, due to the large ground-to-ground capacitance of the cable, after the DC withstand voltage test on the submarine oil-filled cable, the cable has accumulated a large amount of charge and still maintains a high voltage of hundreds of kilovolts. Therefore, it is not safe to use artificial discharge. If only the test equipment itself is us...

Claims

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Application Information

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IPC IPC(8): G01R31/12H01T19/04H01T19/02
CPCG01R31/1272H01T19/02H01T19/04
Inventor 罗朋振黎建平王竣韦晓星黄大为罗小彬王言张潮杨锡清曾航姜克如黄聪
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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