The research on high-voltage measurement

Capacitor voltage transformers (CVT) gradually replace the electromagnetic voltage transformers (EVT) in high-voltage measurements in recent years. But transient process of CVTs is worse. Recently much research work has been focused on improving CVT. In this paper a novel CVT named capacitance-resistance voltage transformer (CRVT) is put forward. Its principle is analyzed, and transient response is investigated. The results show that transient response is improved greatly. Furthermore we analyze the effect of environmental factors on the measurement precision of CRVT. Stray capacitance and temperature are two important environmental factors. Theoretical mode of effects on measurement precision is counted, and some parameters are surveyed. The effects of the stray capacitance and environmental temperature on measurement precision are analyzed, and the quantitative relationships are described. The methods for improving measurement precision are provided. Both theoretical analysis and experimental results show that CRVTs are much better than CVTs.