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SUMMARYThis paper describes a newly developed impulse voltage generator (IG). It has the following features: (1) !he IG consists of three components (a 1.6 MV unit, a I . 4 M V unit and a base box); this facilitates mounting on 1 0-4011 trucks, therefore making it easier to move to a test field. (2) Capacitors, discharge gaps and a control unit are cnclosed in fiber-reinforced plastics, making it possible to I I S~ the IG in all weather. (3) The IG can generate several ten AA when a load is a few ten R. (4) Composition of the circuits for lightninglswitching impulse voltage/ current tests can be easily done by changing the damping and discharge resistance cassettes. Control and data xquisition are made by personal computer.For IG application during an outdoor test, this paper presents the characteristics of resistances of a 77-kV substation grounding and a concrete pole when applying ;I high impulse current. The resistances are dependent on t h r crest value of the applied current.

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