Thyristor malignitions and protector relay failures caused by GCB closing in the CIS of a cable system could not be controlled by reducing the ground impedance Or adding surge absorbing capacitors. As a result, a study was installed in a factory. It was found that malignitions and failures such as mentioned above could be controlled by preventing loMHz ultra high-frequency surges emitted by the from leaking out into the grounding system. often used nearby. This has invited interference problems caused by surges in grounding systems when GIS units are switched. Theoretical and experimental studies have been carried out on transient ground potential rises in the GIs and against flashover generated between the insulating flanges at the junction between GIS and cable has been also studied [8]. However, there have been very few reports on the causes of interference observed in actual field electronic apparatuscarried Out On this problem with a 66kV mock-up apparatus the generation and propagation of surges [1-7], Protection

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