Amp draw from clamp on meter versus Power Logic meter
Amp draw from clamp on meter versus Power Logic meter
(OP)
While performing maintenance on a UPS we run our gens and do a wrap around feed to a distribution board. The power going through the bypass breaker and the power for the wrap around is coming from the same Emergency buss. When 1 of the 2 paralleled feeds is energized, current readings are approximately 40 amps per phase measured with a clamp on meter and by the Power logic system. When both feeds are energized; because they are paralleled we would expect the load to be approximately 20 amps per phase, per feeder. What we see with a clamp on meter is 50 to 70 amps per phase on 1 feeder and 60 to 90 amps per phase on the other feeder; but Power Logic still reports 40 amps per phase. This is not a problem I am just trying to figure out what is happening to better understand this anomaly. Thanks






RE: Amp draw from clamp on meter versus Power Logic meter
Can you post a diagram?
Bill
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"Why not the best?"
Jimmy Carter
RE: Amp draw from clamp on meter versus Power Logic meter
RE: Amp draw from clamp on meter versus Power Logic meter
The two supplies are coming from the same source but are the cables same size and cable lengths identical!!
As waross said the current you see in individual incoming circuits cannot be any thing but the circulating current. There needs to be some source to drive these currents.
RE: Amp draw from clamp on meter versus Power Logic meter
If they were bolted (identical), you wouldn't need the wrap.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: Amp draw from clamp on meter versus Power Logic meter
RE: Amp draw from clamp on meter versus Power Logic meter
For that, you need a voltage difference that drives the circulating current.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: Amp draw from clamp on meter versus Power Logic meter
RE: Amp draw from clamp on meter versus Power Logic meter