Split Delta Ground Detection Problem
I have a 480 ungrounded system with split delta ground detection. The primaries are connected to the 480 bus in a grounded wye. The secondaries are connected in a delta with a 64 (ground detection relay ) and a dampening resistor between the 2 phases that form the apex of the delta. It looks to have 2 high resistance grounds on 2 phases and the 3rd phase is ungrounded. We connect the thumper and there is no current flow during the pulses. The 64 relay does not pick up there is anout .2 amps of current through the resistor. No breakers have triped and the line to line voltage is 480. The line to ground voltages are like 150 220 and 390 from memory .
Any ideas ?
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