Accuracy research of switching capacitor device based on synchronous vacuum circuit breaker

The accuracy of 10 kV synchronous vacuum circuit breaker consists of two aspects; the measurements accuracy and the phase accuracy. Little research has been focused on the measuring accuracy problem of power system acquisition device, which results in error between measurements and actual value. In this paper, a novel voltage measuring circuit with capacitor is designed, and the error of this acquisition device is analyzed in terms of numerical precision and phase accuracy. The calculation errors of switching phase angle and power value caused by temperature variation are discussed as well. The voltage acquisition system features small size, light weight, low cost, and small power consumption, and satisfies the demands of engineering.