7
OPERATING INSTRUCTIONS
MN280067EN July 2017
Type MET electronic recloser control tester operating instructions
3. Form 3 family controls only: To prevent overshooting
while raising the test current to the minimum-trip
level, remove the timing plug from Socket 1 to provide
instantaneous trip.
4. Make sure the control is programmed for at least one
fast ground trip operation.
5. Set control switch to NON-RECLOSING to provide
oneshot- to-lockout operation.
6. Energize the tester by setting the ON/OFF Power
switch S1 to ON. The green Recloser Simulator-Open
lamp will light.
7. Set the Ammeter Range switch S4 to the appropriate
range for the expected minimum-trip current.
8. Set the Low Ground Trip-Normal switch S9 to normal
unless the control is programmed to trip at a below
10-amp; then place switch in Low Ground Trip position.
9. Move the Manual Control switch to CLOSE and release.
The simulator will close in approximately 3/4 second;
green OPEN light off, red CLOSED light on.
10. Apply fault current.
A. Form 2 and Form 3 family controls: Set Fault
Current switch S2 to TEST and advance
Fault-Current Adjust control TR1 from 0 while
observing the ac Ammeter reading.
B. Form 4 family controls: Set Fault Current switch
S2 to TEST and advance Fault-Current Adjust
control TR1 from 0 while observing the control’s
Current Above Minimum Trip indicator, note the
current recorded by the Ac Ammeter at the point
where the indicator displays.
otee:
N
For Form 3 family controls equipped with the
Low-Current Ground-Trip accessory, the 5.8-amp
minimum-trip resistor should trip at an equivalent
test current of 5.0 mA and the 10-amp resistor at
an equivalent test current of 9.2 mA when the Low
Ground Trip-Normal switch S9 is in the Low Ground
Trip position.
11. Return the control and tester settings to INITIAL
CONDITIONS; Form 3 family controls, remove the
shorting jumper from across the A-phase-trip resistor;
Form 4 family controls, re-program the phase minimum
trip level to its original level.
TCC check
Either the control-response time or the recloser-clearing
time can be checked by setting the Time Selector switch
to the appropriate position. In the RECLOSER CLEARING
position, the trip time will include a delay of approximately
2-1/2 cycles, the time it takes a Type RE or RVE recloser to
respond to the trip signal from the electronic control.
Figures 4 and 5, in Appendix A, show the control response
and Types RE and RVE clearing TCC curves for some
common Form 3A control phase-trip- and ground-trip-timing
plugs. To check the time-current characteristics, check
that the control and tester settings are as specified under
INITIAL CONDITIONS and proceed as follows:
1. Set the control switch to GROUND TRIP BLOCK to
disable the ground trip function while checking the
phase trip-timing plugs.
2. Set the Time Selector switch S3 to either CONTROL
RESPONSE or RECLOSER CLEARING as appropriate.
Place Display Mode switch, S11, to UPDATE and the
Auto Reset switch, S12, to ON.
3. Energize the tester by setting the ON/OFF Power
switch S1 to ON. The green Recloser Simulator-Open
lamp will light.
4. Set the Ammeter Range switch S4 to the appropriate
range for the current at the predetermined test point on
the TCC curve.
5. While holding the Fault Current switch S2 in
CALIBRATE, advance the Fault Current Adjust control
TR1 until the ammeter indicates the desired value
(minimum trip level, or greater).
6. Move the Manual Control switch to CLOSE and release.
The simulator will close in approximately 3/4 second;
green OPEN light off, red CLOSED light on.
7. Reset the timer.
8. Set the Fault Current switch S2 to TEST and record the
response or clearing times of the phase-trip-timing curve.
9. Set the Fault Current switch S2 to OFF and repeat
steps 6, 7, and 8 with Phase Selector switch S5 set at
B and at C.
10. Return the Phase Selector switch S5 to A, control
Ground Trip switch to NORMAL.
11. Control settings.
A. A. Form 2, Form 3 and Form 3A controls: place a
shorting jumper across the A phase-trip resistor
to disable the phase trip function while checking
the ground trip operation, and check that Phase
Selector switch S5 is also set to A.
B. B. Form 4A and Form 4B controls: program the
phase minimum trip level to, at minimum, 2 times
(200%) the ground minimum trip level.
12. Repeat steps 4 through 8 and record the response or
clear-ing times of the ground-trip-timing plugs.
13. Return the control and tester settings to INITIAL
CONDITIONS; Form 3 family controls, remove the
shorting jumper from across the A-phase-trip resistor;
Form 4 family controls, re-program the phase minimum
trip level to its original level.
Reclosing time test
The recloser simulator has a built-in time delay of
approximately 30 cycles before the reclosing signal from
the electronic control is implemented. This simulates the
mechanical operating time of the Types RE and WE reclosers.
