Trip And Drop-Off Timing; Hint: How To Test A Three-Phase Voltage Relay25 - ISA T1000 PLUS User Manual

DOC. MIE91093 Rev. 1.34 Page 25 of 145

1.2.5. Trip and drop-off timing

Now we can measure trip timings, following the V-t curve with
as many points as desired.
Press ON and pre-adjust the first test voltage (either more
than V> or less than V<): as the relay trips, don't save test
result; go OFF. Select ON+TIME: as the relay trips, test goes
OFF; pressing the multi-function knob tripping values can be
saved. The TRIP LED (43) turns on and parameters at trip are
displayed until ON or ON+TIME are selected. Confirm save
results pressing the multi-function knob, and proceed with
other test voltage, until all points to be tested are measured.
Now we can measure the drop-off timing. First thing, select
the NO (or NC) level for the relay reset contact:
Timer start/stop > STOP > EXT > Clean (Voltage) > NC
(NO) ESC
Now, press ON and pre-adjust the voltage at a value where
the relay trips. Select OFF+TIME: as the relay resets, pressing
the multi-function knob drop-off values can be saved. Confirm
save results pressing the multi-function knob, and proceed.
1.2.6. Hint: how to test a three-phase voltage relay
If you have a three phase voltage relay to test, how can you
do it given the fact that T1000 PLUS only has two voltage
generators? The problem can be easily solved using the two
available voltages with a phase shift of 60°, and connecting
them as phase to phase voltages rather than phase voltages.
The drawing gives the idea.