Discharge synchronization of 10 switches in 100 kA-LTD module diagnosed by optic fiber array

An optical fiber array is designed for testing initial discharge time of coaxial multi-gap gas switch, it has less than 1 ns time consistency and consists of two parts: optical fiber probe array and multi-channel photoelectric convertor. Based on a 100 kA-LTD module which has 10 parallel discharge branches, discharge time jitter of all switches has been tested. Experimental results show that: As the ratio of charge voltage and operating voltage is 85%, the time jitter is less than 6.9 ns, load current waveform has well consistency;while the ratio falls to 53%, time jitter dramatically increases to 117.7 ns and load current waveform consistency is deteriorated significantly. Experimental data from optic fiber array are put into the PSpice circuit model for simulation, the results show that the simulation results and experimental ones have better consistency. Itproves the accuracy of the diagnosis system and the correctness of the analysis.