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The paper proposes a new measurement technique for detecting tr:insformer faults. A specially designed transient current detection device is used to capture the fault generated high frequency current transients. The device tuncd to a special band of high frequency is connected to the transformer through the CTs at both high and IOW voltage sides of the transformer. The captured transient signals a1 both ends of the transformer are then compared, with pai~ticularly emphasis on the high frequency Characteristics iii the frequency domain; the internal f a u k is discriininaied from the external fault by spectral comparison. The high frequency modelling of the transformer is incorporated into the simulation. The simulation aklo involves the inodelling of the faults between any turn and the earth andl between any two turns of the transformer windings.

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