A hollow cathode surge protective gap (HCSPG) was designed, and the dischargecharacteristics was investigated in an air and nitrogen gas environment. For both the gap spacingD and the hole diameter φ of HCSPG of 3 mm, the voltage protective value U_p of HCSPG isabout 3.5 kV and its converting time t_c exceeds 100 ns at an air pressure from 10 Pa to 100 Pa.The maximum converting time t_c from glow to arc discharging reaches 1600 ns at an air pressureof 100 Pa, while the minimum converting time t_c is 120 ns at 10 Pa. For a triggered HCSPG, U_pis reduced to about 1.6 kV while the converting time is 120 ns with a semiconductor trigger deviceand 50 ns with a dielectric porcelain trigger device under an air pressure of 100 Pa.
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