4. Remove the jumper wire from pins 1 and 4 of the
Customer Connections terminal block.
5. Using the jumper wire, jumper pins 2 and 4 of the
Customer Connections terminal block.
6. Using another jumper wire, momentarily jumper pins
5 and 15 of the Customer Connections Terminal Block.
The B-Phase flux-shift tripper on the VFI tester should
operate.
7.
Remove the jumper wire from pins 2 and 4 of the
Customer Connections Terminal Block.
8. Using the jumper wire, jumper pins 3 and 4 of the
Customer Connections Terminal Block.
9. Using another jumper wire, momentarily jumper pins
5 and 15 of the Customer Connections Terminal Block.
The C-Phase flux-shift tripper on the VFI tester should
operate.
10. Remove the jumper wire from pins 3 and 4 of the
Customer Connections Terminal Block.
11. Reset the flux-shift trippers.
External flux-shift tripper tests
The External Flux-Shift Tripper Test verifies the operation of
the flux-shift trippers contained within the VFI switchgear
under test. It should be used as a final diagnostic procedure
only after verifying the control is operating correctly through
administration of the control tests detailed in the
Operating
Procedures
section of this service bulletin.
WARNING
Hazardous voltage. Disconnect all source and tap elbows
prior to conducting an external flux-shift tripper test.
Failure to comply can result in possible contact with high
voltage resulting in death or severe personal injury.
T320.0
WARNING
Hazardous voltage. Always use a hotstick when working
with this equipment. Failure to do so could result in
contact with high voltage, which will cause death or
severe personal injury.
G108A.0
IMPORTANT
If service conditions allow, the VFI unit should be removed
from service by disconnecting all sources of system
voltage. If it is not possible to remove the VFI device from
service by disconnecting all sources of system voltage,
follow the procedures and safety precautions detailed in the
TESTING IN-SERVICE VFI UNITS
section found on page 5
of this service bulletin.
Side-hinged units with TPG controls
1.
Remove the pad-mounted unit from service.
2. Attach the power cable to the VFI tester and plug it into
a grounded, three-prong 120 VAC outlet.
3. Connect the 14-pin female/14-pin male interrupter
interface cable (Item 1) to the VFI tester at the
interrupter port. Refer to Figure 6 for steps 3 through
17.
4. Break the connection between the control and VFI unit
by disconnecting the VFI control cable (Item 2) from
the male receptacle located on the outside of the TPG
control enclosure.
5. Connect the 14-pin male connector end of the tester
interrupter interface cable (Item 1) to the 14-pin female
end of the padmount cable (Item 2) originating from the
front plate of the VFI unit under test.
6. Place the Phase Test Selector switch on the VFI tester
into the EXTERNAL TRIPPERS position.
7.
Some three-phase ganged VFI assemblies are built
with a single flux-shift tripper mounted on the "B" phase
mechanism. Others have a flux-shift tripper mounted on
the mechanism for each phase. Determine which type
is being tested, and test accordingly.
Operating Instructions
MN285001EN December 2018
17
