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DIFFERENT TYPES OF FAILURES
VARIATION OF IMPULSE CURRENT THROUGH
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55 microseconds applied wave Beldi capacitance change of voltage chopped wave circuit of Pig circuit shown complete current wave core to ground crest cuit current flowing decrease depends detection of failure detection of fault deviation discharges distribution transformer fault detection Figure fourth coil full wave grams high voltage coil high voltage winding impedance impulse current impulse tests impulse voltage impulse wave inductive current Insulation failure Internal impedance lj.0 microseconds low voltage winding maximum amplitude method of fault midpoint normal frequency excitation observed occurs oscillations oscilloscope peak Pig Pig power transformers resistance shunt respectively the complete second coil secondary winding sensitivity shown in Pig shows the complete shows the voltage slight square wave standard wave superposed surge tail terminal terminal X Test Series third coil tion trans turns short circuit voltage distribution voltage oscillograms wave form wave Pig wave shape wave showed winding to ground winding under test