DOC. MIE91093 Rev. 1.34 Page 66 of 145
time that allows the relay to reset; after this, test starts by
changing only the frequency of V2.
This explained, the test procedure is the following.
. Adjust the pre-fault amplitude of V2 to VN:
AUX VAC/VDC > Aux VAC control > Range (RET)
Mode > Pre-fault+fault > Pre-
fault amplitude > (Value) (RET)
Pre-fault
duration > (TPF) ESC
. Press ON, and adjust: V1 to VN; the phase angle of V2 with
respect to V1 to the first angle (for instance, - 6°); the fault
frequency to the first test value:
AUX VAC/VDC > Aux VAC control > Phase > Reference :
voltage> (Value) (RET)
> Frequency > Adjust
> (FTEST) ESC
. Now, press ON+TIME and check if the relay trips.
- The relay trips: increase the frequency (with FTEST > FN) by
the desired accuracy, and repeat until the relay does not trip.
Program the last frequency when it tripped, start the test and
save the test result.
- The relay does not trip: decrease the frequency (with FTEST
> FN) by the desired accuracy, and repeat until the relay trips:
as it does, save the test result.
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