Constant current discharging device for ultra-high voltage long cable after direct-current withstand voltage test

A technology of withstand voltage test and constant current discharge, applied in the direction of testing dielectric strength, etc., can solve the problems of operator safety, long discharge time, etc., to achieve the effect of improving safety, increasing current value, and shortening discharge time

Inactive Publication Date: 2013-06-19
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a constant current discharge device for UHV long cable DC withstand voltage test, which can control the water resistance of conductive liquid according to the discharge current, realize constant current discharge, and solve the problem of the UHV long cable withstand voltage test. The problem of long discharge time after the voltage test is solved, and it is convenient to operate in various places, and it can also realize remote operation so that the operator has no safety worries

Method used

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  • Constant current discharging device for ultra-high voltage long cable after direct-current withstand voltage test
  • Constant current discharging device for ultra-high voltage long cable after direct-current withstand voltage test
  • Constant current discharging device for ultra-high voltage long cable after direct-current withstand voltage test

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Embodiment

[0026] This embodiment describes a constant current discharge device used for the DC withstand voltage test of the UHV long cable. The circuit diagram of the UHV long cable DC withstand voltage test is as follows figure 2 As shown, the test device includes a series-connected DC high-voltage generator, a current-limiting resistor, a microampere-level ammeter, and a long UHV cable to be tested. There are cable core access points 13 .

[0027] The overall structure of the constant current discharge device is as follows: figure 1 As shown, it includes a conductive liquid mixing unit, a constant current control unit, and an insulating hose 12 connecting the cable core access point 13 and the conductive liquid mixing unit. The conductive liquid mixing unit is used to mix the conductive liquid and water and when discharging Pump the mixed conductive liquid into the insulating hose 12. The conductive liquid in the insulating hose 12 flows through the cable core access point 13 and t...

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Abstract

The invention discloses a constant current discharging device for ultra-high voltage long cable after direct-current withstand voltage test. The constant current discharging device discharges the ultra-high voltage long cable after direct-current withstand voltage test through mixed conductive liquid. During the discharging process, loss of charge results in declination of current value. A constant current controlling unit can open a conductive liquid valve of a conductive liquid storing chamber and a synthetic liquid storing chamber according to the change of current value, lower the resistance of the mixed conductive liquid in the synthetic liquid storing chamber to increase current value, thereby the current of the mixed conductive liquid is always in a state of a constant value during discharging, and discharging time is shortened to be suitable for various working stations.

Description

technical field [0001] The invention relates to a device for performing rapid constant current discharge on a long UHV cable after a DC withstand voltage test on a UHV long cable. Background technique [0002] As the country vigorously builds the UHV smart grid, a large number of UHV equipment will be invested, and a large number of UHV equipment will inevitably bring about the great development of UHV test equipment. After the DC UHV long cable withstand voltage test, high-voltage discharge has always been a problem. UHV discharge is a dangerous job. The use of fixed resistors has a long discharge time and long-term power storage, which prolongs the withstand voltage for long cables. Time and withstand voltage are originally a destructive test, and long-term storage of UHV long cables is dangerous, so a UHV large-capacity short-term discharge device is required. [0003] Since the capacitance of the UHV cable is quite large, after the UHV DC withstand voltage test, a consi...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 臧涛成樊斌周洪
Owner SUZHOU UNIV OF SCI & TECH
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