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THEORY OF OPERATION
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additive polarity alternating current ammeter amperes applied auto-transformer cause circuit conductor cooling copper losses current flowing delta connection device dielectric strength displacement distribution transformers electrical equipment flashover former fuse GASKET ground heat high voltage winding indicate installed insulation iron core lamps leads lightning arrester load losses low voltage winding magnetic field maximum Megger moisture mounted nected neutral number of turns oil or askarel open delta operation output phase pole polyphase Polyphase Systems power factor power transformer primary and secondary primary coil primary winding ratio of transformation reactance relative direction resistance secondary coil secondary voltage secondary winding short-circuited shown in Fig sine-wave single-phase transformers STEP-DOWN substation supply tap changer tap changing temperature terminals three-phase transformer tion trans transfer switches transformer tank TRANSFORMER UNDER TEST transformers connected tube two-phase two-winding transformers units volt-amperes voltage drop voltage ratings voltage regulator voltage surge voltmeter volts wire