Woodward SEG HighPROTEC MRA4, Device Manual

Page: 384 / 510

PQS – Power Protection Module [ANSI 32, 37]
Commissioning Examples for the Power Protection Module
Object to be tested
•
Testing the projected Power Protection Modules.
•
P>
•
P<
•
Pr
•
Q>
•
Q<
•
Qr
•
S>
•
S<
Necessary means
•
3-phase AC voltage source
•
3-phase AC current source
•
Timer
Procedure – Testing the wiring
•
Feed 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.
The examples shown within this chapter have to be carried out with the
tripping values and tripping delays that apply to your switchboard.
If you are testing „greater than thresholds“ (e.g. P>) start by 80% of the
tripping value and increase the object to be tested until the relay picks up.
In case that you are testing „less than thresholds“ (e.g. P<) start by 120% of
the tripping value and reduce the object to be tested until the relay picks
up.
If you are testing tripping delays of „greater than“ modules (e.g. P>) start a
timer simultaneously with an abrupt change of the object to be tested from
80% of the tripping value to 120% of the tripping value.
If you are testing tripping delays of „less than“ modules (e.g. P<) start a
timer simultaneously with an abrupt change of the object to be tested from
120% of the tripping value to 80% of the tripping value.
Page 384 EN MRA4 04/09