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
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[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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