High voltage dc-biased ac test system

Details High voltage dc-biased ac test system High voltage dc-biased ac test system

G - Physics

01

R

G01R 31/08 (2006.01) G01R 31/02 (2006.01) G01R 31/10 (2006.01)

Patent

CA 2180163

Test apparatus for a high voltage cable installation includes a high AC voltage source having the frequency range intended to be carried by the cable installation and a high DC voltage source. A switch alternately passes positive and negative polarities of the DC voltage, and the AC voltage source and the alternating polarity DC voltage output from the switch are coupled while isolating the voltage sources from each other. The resulting alternating polarity DC- biased AC voltage is injected into the cable installation to produce indications of incipient faults.

Un appareil destiné à l'essai d'un câble haute tension comprend une source de tension alternative élevée (10) couvrant la plage de fréquences pouvant être transmises par le câble, et une source de tension continue élevée (16). Un commutateur (18) fait passer alternativement une tension continue à polarité positive et à polarité négative, et la source de tension alternative est couplée avec la tension continue à polarité alternative sortant du commutateur, tandis que les sources de tension sont isolées l'une de l'autre. La tension alternative (26) à polarisation continue et à polarité alternative obtenue est injectée dans le câble, cela permettant de découvrir des défauts naissants.

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