GE prolec VR-1 Installation, Operation And Maintenance Manual

Also see for VR-1: Installation operation & maintenance

GEH-7299A: Installation, Operation and Maintenance Manualfor Type VR1™ Single-Phase, Step Type Regulatorsprolec.energy/prolecge7which oil is flowing. Arcs can occur from the free surface of the charged oil even though previous grounding precautionshave been taken.3.1.2 Sealed-Tank RegulatorThe sealed-tank regulator has a volume of gas, initially air, above the insulating liquid that is sealed from the atmosphere.Normally there is no inward or outward flow of air or moisture with temperature change, so that oxidation of the insulatingliquid is held at a minimum. As a result, the dielectric strength of the insulating liquid is maintained at a high value over longperiod of operation.Warning: To avoid possible injury, pull ring on pressure relief to manually equalize internal tank pressure beforeattempting 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. Thecurrent 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 openingthe Molex connection to the control module or the control module cable. The control module can now be removed from thecontrol cabinet hinges.To remove the control cabinet and cable from voltage regulator:1. De-energize the voltage regulator2. 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 switchis in place.Figure 1. External views of Type VR-1 step voltage regulatorsStandardPole MountSub-StationPole Mount,Platform, orSub-Station