Removal from service
otee:
N
Before removing a regulator from service, you must
return the regulator to neutral. Only a regulator in
the neutral position can be safely removed from
service without interrupting load continuity. It is
recommended to use at least four methods to
confirm the neutral position, as specified in step 2,
below.
DANGER
Explosion Hazard . During bypass switching, the
regulator must be in the neutral position . Prior to
bypass switchinge: 1) The regulator must be placed in
the neutral position; 2) Tap-changer operation must be
disabled during the bypass switching . If the regulator
is not in the neutral position, part of the series winding
will be shorted when the bypass switch is closed,
resulting in high circulating current . Failure to comply
will result in death or severe personal injury and
equipment damage .
WARNING
Explosion Hazard . Bypass a regulator with the line
energized only if the position indicator, the neutral
light, and the control tap position indicate neutral and
the voltage measured between the source and the load
bushings using an approved voltmeter or CL-7 SAFE-
TO-BYPASS feature is zero . If all indications of neutral
do not agree, the line should be de-energized to avoid
shorting part of the series winding and resultant high
circulating current . Failure to comply can result in death
or personal injury and equipment damage .
WARNING
Explosion Hazard . To ensure a complete tapping
operation when returning the tap-changer to the neutral
position, the CONTROL FUNCTION switch must be
placed in the OFF position before the POWER switch is
placed in the OFF position . Failure to comply can result
in the tap-changer stepping off of neutral immediately
upon being energized which can result in death or
severe personal injury and equipment damage .
To remove a regulator from service:
1. Use the
Raise/Lower
switch to bring the regulator to
neutral position.
otee:
N
When in neutral, the
Neutral
light will be
continuously and brightly lit on the control front
panel and the position indicator will point to zero
or N for Neutral.
2. Verify the neutral position of the regulator using
each
of
these four methods:
a. Verify that the neutral indicator light on the
control is indicating the neutral position. Neutral is
indicated only when the light is continuously and
brightly illuminated.
b. Verify that the tap position on the control indicates
neutral by using the Metering-PLUS™ key or
FC 12. When in neutral, these display “0” (zero).
c. Verify that the position indicator on the regulator
is pointing straight up, either to zero or to “N” for
Neutral.
d. Using an approved voltmeter or CL-7 SAFE-TO-
BYPASS feature, verify that there is no voltage
difference between the source and load bushings.
otee:
N
Do not proceed to step 3 until you have
confirmed that the regulator is in the Neutral
position using
all four methods
listed above.
WARNING
Explosion Hazard . After placing the regulator in the
neutral position for bypass switching, always disable
the motor to prevent a tap change during bypassing
which can result in the tap-changer stepping off of
neutral . Failure to comply can cause death or severe
personal injury and equipment damage .
3. Disable the tap-changer motor to ensure that the
tap-changer cannot inadvertently switch to an
off-neutral position:
a. Place the CONTROL FUNCTION switch in the
OFF
position.
b. Remove the motor fuse.
c. Place control POWER switch in the
OFF
position.
d. Open
V1
knife switch (and
V2
,
V6
, and
V8
if
present) located on control back panel.
otee:
N
Do not proceed to step 4 until you have disabled
the tap-changer motor as directed above.
4. De-energize the regulator:
a. Close the bypass switch.
b. Open the load (L) disconnect switch.
c. Open the source (S) disconnect switch.
d. Open the source-load (SL) disconnect switch, if
available.
otee:
N
If a regulator bypass disconnect is used in place
of three separate switches, step a, step b, and
step c are carried out in one operation.
11
VR-32 and EVER-Tap™ Voltage Regulator
InstallatIon, operatIon, and MaIntenance InstructIons
MN225008EN June 2020
