A triggered surge protective device is designed and its discharge characteristics are studied. The experimental results show that the triggered surge protective device has excellent surge protective characteristics. When the gap distance is 5 mm, p?d is 90 Pa?mm and without an active energy trigger circuit, the DC breakdown voltage of the triggered surge protective device is 2.32 kV and the pulse breakdown voltage is 5.75 kV. Therefore, the pulse voltage ratio, which is defined as the specific value of pulse breakdown voltage and DC breakdown voltage, is 2.48. With a semiconductor ZnO flashover trigger device and an active energy coupling trigger circuit, the pulse breakdown voltage can be reduced to 3.32 kV, the pulse voltage ratio is 1.43 and the response time is less than 100 ns. These results are helpful in laying a theoretical foundation for further studies on triggered surge protective devices.
Qiyun CHENG (程启耘), Yi YU (余羿), Shaobo GONG (龚少博), Min XU (许敏), Tao LAN (兰涛), Wei JIANG (蒋蔚), Boda YUAN (袁博达), Yifan WU (吴一帆), Lin NIE (聂林), Rui KE (柯锐), Ting LONG (龙婷), Dong GUO (郭栋), Minyou YE (叶民友), Xuru DUAN (段旭如). Optical path design of phase contrast imaging on HL-2A tokamak[J]. Plasma Science and Technology, 2017, 19(12): 125601. DOI: 10.1088/2058-6272/aa8d64