Stability and reliability analysis for broadband current array sensing system applied to GIS

Fei Du – Hao Yu – Shuai Yuan – Jiangang Bi – Dehui Fu

   In order to further improve the defect detection capability of gas insulated switchgear and avoid equipment faults, broadband current array sensing system is designed to simultaneously monitor the system status such as partial discharge, relative dielectric loss, and power frequency overvoltage. The dynamic model of the system is analysed, and based on which, the system state equation is obtained meanwhile fault observer is designed, and the system stability criterion under H∞ condition is calculated. The reliability of the system under different packet loss rates is verified based on cloud models, and the principle of using appropriate electromagnetic compatibility to prevent packet loss rates below 50% is proposed.

Keywords: gas insulated switchgear, current sensing, stability, reliability, system control

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