EMR-5000
IM02602012E
Commissioning: Power Factor
Object to be tested:
•
Testing the projected Power Factor Modules.
Necessary means:
•
Three-phase AC voltage source;
•
Three-phase AC current source; and
•
Timer.
Procedure – Testing the wiring:
•
Feed the rated voltage and rated current to the measuring inputs of the relay.
•
Adjust the current pointers 30° lagging to the voltage pointers.
•
The following measuring values have to be shown:
•
P = 0.86 Pn
•
Q = 0.5 Qn
•
S = 1 Sn
If the measured values are shown with a negative (algebraic) sign, check
the wiring.
In this example, the PF-Trigger is set to 0.86 = 30° (lagging) and the PF-
Reset is set to 0.86 = 30° (leading).
Carry out the test with the settings (trigger and reset) that fit the
switchboard.
Testing the threshold values (Trigger) (PF Trigger: Example = 0.86 lagging):
•
Feed the rated voltage and rated current in phase to the measuring inputs of the relay (PF=1).
•
Adjust the angle between the voltage and current (current pointer lagging) until the relay picks up.
•
Write down the pickup value.
Testing the Reset (PF Reset: Example = 0.86 leading):
•
Reduce the angle between voltage and current beyond PF = 1 (current pointer leading) until the alarm drops
off.
•
Write down the reset value.
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