Liquid-filled, medium-voltage S-VFI unit substation ...· DOC file· Web viewThis specification applies to three-phase, 300–12,000 kVA, 50-60 Hz, dead front or live front, unit substation transformers. Transformer overcurrent protection shall be accomplished utilizing a 24VDC microprocessor-based feeder relay paired with a resettable vacuum fault interrupter (VFI) which shall be provided with three-pole ganged operation.
[email protected]Transformer temperature, oil level and pressure gauges· Transformer pressure gauge. If the transformer is equipped with a constant-pressure nitrogen oil preservation system, then pressure gauges are included to measure the pressure of the gas blanket and the nitrogen in the make-up bottle.. Transformers that have a gas blanket over the oil in the main tank usually come equipped with pressure gauges.
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Get Priceoil leak in transformer - CR4 Discussion Thread· Transformers should NEVER be filled from the bottom using vacuum. If there is an air leak, the air goes throughout the transformer. There should be two fittings on the top of the transformer, one fitting should be for the vacuum and the other fitting should be for incoming oil.
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Get PriceWhat is a Constant Voltage Transformer - an introduction ... stabilisation can be achieved using a simple magnetic device which has no moving parts. This is a process of producing a constant ac voltage from a varying ac voltage supply and involves the use of saturable reactors. The latter may be incorporated in a special transformer magnetic saturation being produced in a part of the magnetic circuit.
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