ISA T1000 PLUS - Trip and Drop-Off Timing

DOC. MIE91093 Rev. 1.34 Page 38 of 145
. Set the current to voltage angle at next value.
. Select ON; slowly increase the current. As the relay trips, the
display shows the corresponding single-phase active and
reactive power. If the relay is properly set, the active power
should be the same as test before, and should display P%,
while the reactive power should be 1.73 * P%.
. Next, we find the drop-off threshold. From the trip current
above, slowly decrease the current; as the relay resets, save
test result.
1.4.5. Trip and drop-off timing
Now we can measure trip timing. Press ON and pre-adjust the
test current (to more than P%): 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.
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
Then, select ON and 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.