5
OPERATING INSTRUCTIONS
MN280067EN July 2017
Type MET electronic recloser control tester operating instructions
(2) Energize the operator cabinet of the recloser
with 230-Vac power and turn Test Selector
Switch S6 to CHARGE—(40 mA). The meter
should read approximately 15 mA minus the
discharge rate measured in Step 3.
5. Disconnect the test cable and reconnect the jumper
link between the
⇐
|
⇒
terminals on the control panel.
Control tests
The right side of the tester panel contains the
instrumentation and associated test switches for checking
the operation of the Type ME electronic control. The test
current generated by the tester simulates the output of the
recloser’s current-sensing bushing transformers.
Minimum trip resistors, used in Form 2, Form 3 and Form
3A controls, with a yellow label are used with reclosers
having 1000:1 bushing-current transformers. Thus, the
test current in milliamps will be equivalent to the recloser
current in amps in a direct 1:1 ratio. To simulate a 200-amp
fault current, the tester output is adjusted to 200 mA.
Minimum trip resistors with blue labels are used in Form
2, Form 3 and Form 3A controls that are connected to
reclosers having 2000:1 bushing-current transformers (Types
ME, MLE, and MVE reclosers). In these cases the test
current in amps will be equivalent to the recloser current in
a 1:2 ratio. To simulate a 200-amp fault current, the tester
output is adjusted to 100 mA.
Form 4A and Form 4B controls can be programmed
to operate with 500:1, 1000:1 or 2000:1 ratio current
transformers. Prior to testing Access Code 10 must be
examined to determine the programmed ratio. The test
current, in amps, is then equivalent to recloser current in
either a 1:0.5, 1:1 or 1:2 ratio, respectively. To simulate a
200-amp fault current, at a 500:1 ratio, the tester output is
adjusted to 400 mA. To simulate a 200-amp fault current, at
a 1000:1 ratio, the tester output is adjusted to 200 mA. To
simulate a 200-amp fault current, at a 2000:1 ratio, the tester
output is adjusted to 100 mA.
Initial conditions
Control
1. Battery connected and control in lockout (verify with
the Lockout Test switch and/or Lockout Indicator,
as applicable).
2. Non-reclosing switch in NORMAL RECLOSING position
3. Ground Trip switch in NORMAL position.
4. Control settings programmed for desired
operating conditions.
Tester
1. All switches and controls in their OFF or extreme
counterclockwise position, except Test Selector switch
S6 in BATT. VOLTS—(40 V).
2. Power cord plugged into a 115-Vac grounded outlet.
See CAUTION at beginning of OPERATING
PROCEDURES section.
3. Cabinet of electronic control under test also grounded.
4. Control connected to tester with the elbow plug of the
appropriate test cable at the tester.
otee:
N
If it is desired to monitor battery voltage during the
control tests, connect the battery to the tester with
the appropriate test cable.
Control operation test (phase trip)
To check the programmed sequence of operation of the
control for a phase fault, proceed as follows:
1. Check that the control and tester settings are as
specified under INITIAL CONDITIONS.
2. Set the control Ground Trip switch to BLOCK to disable
the ground-trip function while checking phase-trip
operation.
3. Energize the tester by placing 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 milliamp
range equivalent to the programmed phase minimum
trip level.
5. While holding the Fault Current switch S2 in
CALIBRATE, advance the Fault Current Adjust control
TR1 to approximately 125—150% of the minimum trip
rating. Release S2.
6. Set the Time Selector switch S3 to RECLOSER
CLEARING, place Display Mode switch, S11, to
UPDATE and the Auto Reset switch, S12, to ON. Reset
the timer.
7. Move the Manual Control switch to CLOSE and release.
The simulator will close in approximately 3/4 second;
green OPEN light off, red CLOSE light on.
8. Set Fault-Current switch S2 to TEST and compare the
number of fast and delayed operations to lockout with
the programming of the electronic control.
9. Repeat Steps 7, and 8 with Phase Selector switch
S5 set at B and at C.
10. Return the control and tester settings to INITIAL
CONDITIONS before proceeding to the next test.
Control operation test (ground trip)
To check the programmed sequence of operation of the
control for a ground fault, proceed as follows:
otee:
N
To enable testing the ground-fault circuits of early
Form 2 controls (below serial number 1615), a special
test hookup is required. See Appendix C.
1. Check that the control and tester settings are as
specified under INITIAL CONDITIONS.
