Fast Diagnostic For Electrical Breakdowns In Vacuum

Houck, T L ; Javedani, J B ; Lahowe, D A

关键词: DESIGN;    ELECTRICAL FAULTS;    FLASHOVER;    ILLUMINANCE;    PROBES;    SENSITIVITY;   

DOI  :  10.2172/928534
RP-ID  :  LLNL-TR-402609
PID  :  OSTI ID: 928534
Others  :  TRN: US0803443

美国|英语

来源: SciTech Connect

【 摘 要 】

The design of an inexpensive, small, high bandwidth diagnostic for the study of vacuum insulator flashover is described. The diagnostic is based on the principle of capacitive coupling and is commonly referred to as a D-dot probe due to its sensitivity to the changing of the electric displacement field. The principle challenge for the design proved to be meeting the required mechanical size for the application rather than bandwidth. An array of these probes was fabricated and used in an insulator test stand. Data from the test stand with detailed analysis is presented. A highlight of the application of the probes to the test stand was the ability to detect the charging of the insulator surface by UV illumination as a prelude to the insulator flashover. The abrupt change in the insulator's surface charge during the flashover was also detected.