Testing of spark gap irreversibility under conditions of operation

The characteristics of a three-electrode spark gap are considered in this paper. Two types of three-electrode gas insulated spark gaps have been tested: a spark gap with a third electrode being inside the main electrode; and a spark gap with a separate third electrode. Both types of spark gaps were theoretically sized in the optimal way. Two characteristics are determined experimentally: (1) the influence of the triggering voltage rate-of-rise on the spark gap functioning; and (2) the degree of spark gap erosion vs. number of operations. Two types of gases were applied: SF/sub 6/ gas; and N/sub 2/ gas. Also, three electrode materials were used: copper; steel; and tungsten. The spark gap switching time and delay time are measured. Statistical analyses of results are also presented.