全天候型分割可搬式インパルス電圧発生装置の開発と接地抵抗非線形特性試験への適用

抄録

This paper describes a newly-developed impulse voltage generator (IG). It has the features as follows:
(1) The IG consists of 3 components (a 1.6MV unit, a 1.4MV unit and a base box) for the sake of mounting on 10t trucks, therefore it is easy to move it to a test field.
(2) Capacitors, discharge gaps and a control unit are enclosed in a shelter of fiber reinforced plastics, then it is possible to use the IG in all weathers.
(3) The IG can generate several ten kA when a load is a few ten Ω.
(4) Composition of the circuits for lightning/switching impulse voltage/current tests can be easily done by changing the damping and discharge resistance cassettes. Control and data acquisition are made by a personal computer.
As the application of the IG to an outdoor test, the paper presents the characteristics of resistances of a 77kV substation grounding and a concrete pole when applying a high impulse current. The resistances are dependent on the crest value of the applied current.