Differential Current
Differential Current
(OP)
iam running a gas generator of 1.5MW Duetz engine which indicting Differetial Current from the control panel.what might be the causes and solution to this problem?
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RE: Differential Current
RE: Differential Current
RE: Differential Current
If this is a new installation, I would strongly suspect incorrect wiring or phasing of the CTs.
If the unit had been running successfully and no wiring changes were recently made, you have to assume there is a problem in the generator. You should shut down, isolate the generator, and do at least a megger test and polarization index.
RE: Differential Current
Generally it will mean that you have experienced a fault between your differential CT's. 87 is very reliable when you have cases of a line to ground fault in the stator. Look for cable termination kit failures, transformer failures, anything between the CT's.
I would start with a visual, then begin isolating the bus and start megger testing until you find your fault.
RE: Differential Current
Is this an LV or MV machine?
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RE: Differential Current