Dual-purpose voltage divider based on standard capacitor

Abstract

The invention provides a dual-purpose voltage divider based on a standard capacitor. The dual-purpose voltage divider comprises a damping resistor, a high-voltage guide rod, a high-voltage electrode, a low-voltage electrode, a ground electrode and a shield electrode, wherein the high-voltage electrode, the low-voltage electrode, the ground electrode and the shield electrode are arranged coaxially in a metal ground cylinder. The low-voltage electrode, the ground electrode and the shield electrode are arranged on the outside of the high-voltage electrode successively. One end of the damping resistor is connected with a high-voltage lead and the other end of the damping resistor is connected with the high-voltage guide rod. The high-voltage guide rod is connected with the high-voltage electrode. Compared with the prior art, the dual-purpose voltage divider based on the standard capacitor uses a low-inductance structure, which reduces the stray inductance of a voltage divider circuit so as to accurately measure impact voltage and power frequency voltage.

Description

technical field [0001] The invention relates to the technical field of high voltage measurement, in particular to a dual-purpose voltage divider based on a standard capacitor. Background technique [0002] The measuring device of power frequency voltage and impulse voltage is generally a voltage divider. During the test, it will be necessary to measure the high voltage and convert it into a low voltage signal that can be measured by the secondary measuring device. Since the power frequency voltage is a continuous voltage with a long period and low frequency, the frequency response requirements of the voltage divider are low, so the power frequency voltage divider is generally a pure capacitive voltage divider, and generally does not absorb active energy. The impact voltage divider is a voltage divider for measuring the full wave of lightning or operating the full wave. The voltage waveform is an intermittent shock wave with high frequency. The energy is small but the freque...

AI Technical Summary

Problems solved by technology

Due to the different media of the high and low voltage arms, their temperature coefficients and voltage coefficients are also different, and the scale factor fluctuates greatly. Generally, only 3% accuracy can be guaranteed, and the linearity cannot be guaranteed. It cannot be used as a standard voltage divider to measure temporary state signal

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