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DC Switch Gear Ground Fault

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M

metroelectric

New User
Location
Washington DC
Occupation
Engineer
We are trying to troubleshoot a frame to ground test on a DC switch gear cubicle. (Background-Installing temporary DC switch gear for a transit project. The switch gear rests on 1/2" thick insulation sheets, anchored to ground using insulated anchors and joined together using insulated bolts. The switch gear is rated for 8000A). Performed a frame-to-ground test on each cubicle at 2500VDC. All but one cubicle passes at that voltage. (criteria to pass is to exhibit a resistance of 100Mohms). The failing cubicle gives a resistance value of 2.5GOhms at 1500VDC but fails as we increase the voltage. we tried all possible trouble shooting methods but could not identify the fault. Any help to solve this issue would be appreciated.
 
petersonra

petersonra

Senior Member
Location
Northern illinois
Occupation
engineer
Have you tried disconnecting the incoming and outgoing wires while you do the test? Maybe the insulation on one of them has started to degrade.
 
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