Current zero measurement(CZM) system can be used to evaluate interruption capability of circuit breakers (CBs). Thus it is a useful instrument for studying the physical mechanisms during the arcing process, designing and optimizing the products. We put forward the principle of current zero measurement, and introduce a newly-built measurement system based on the former. The measurement system consists of an optic-fiber insulated acquisition equipment with a high rate of sample collection, a voltage divider, a Rogowski coil, and a data management platform. A specialized divider and coil after calibration are employed to output the measurement signals of the arc voltage and current, respectively. Then this system was applied to measure the current zero characteristics of a SF6 CB with a voltage level of 252 kV, a rated short current of 50 kA/60 Hz, under the type test L90 with various arcing durations. Test results show that the arc conductivity of 200 ns before current zero and the decreasing rate of arc voltage before current zero can be treated as reasonable indicators of thermal interruption capability of SF6 CBs. The criterions of investigated CB are Glim≈1.4 mS, Plim≈2 850 V/μs, respectively. The measurement system can measure and evaluate the interrupting capability of CBs quantitatively , which will be helpful to improving the level of research and development of high voltage CBs.
KEY WORDS :current zero measurement;SF6 CBs;short line fault;Rogowski coil;voltage divider;arc conductivity;decreasing rate of arc voltage;
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