GEH-7299A: Installation, Operation and Maintenance Manual
for Type VR1™ Single-Phase, Step Type Regulators
prolec.energy/prolecge 7
which oil is owing. Arcs can occur from the free surface of the charged oil even though previous grounding precautions
have been taken.
3.1.2 Sealed-Tank Regulator
The sealed-tank regulator has a volume of gas, initially air, above the insulating liquid that is sealed from the atmosphere.
liquid is held at a minimum. As a result, the dielectric strength of the insulating liquid is maintained at a high value over long
period of operation.
Warning: To avoid possible injury, pull ring on pressure relief to manually equalize internal tank pressure before
attempting to remove the tank cover, remove the hand hole cover, or take an oil sample.
Note: The control cabinet is non-removable if the regulator is energized.
The GE-2011 control and approved third party controls are designed to be removed from the cabinet for service. The
current transformer (CT) shorting switch is mounted in the control cabinet and shorts the current transformer when closed.
Disconnect the Potential Transformer (PT) power switch moving it to the open position. Disconnect the cable by opening
the Molex connection to the control module or the control module cable. The control module can now be removed from the
control cabinet hinges.
To remove the control cabinet and cable from voltage regulator:
1. De-energize the voltage regulator
2. Loosen the two captive screws fastening the cable housing to the bottom of the position indicator.
3. Squeeze the top of the ears on the connectors and gently pull them from the mating connector.
4. Loosen the cabinet mounting hardware and remove the control cabinet.
Warning: Do not energize the voltage regulator unless the control cabinet and the current transformer shorting switch
is in place.
Figure 1. External views of Type VR-1 step voltage regulators
Standard
Pole Mount
Sub-Station
Pole Mount,
Platform, or
Sub-Station
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