Electronic type voltage transformer based on capacitor and resistance-capacitance voltage divider parallel connection

Abstract

The invention discloses an electronic type voltage transformer based on capacitor and resistance-capacitance voltage divider parallel connection. The electronic type voltage transformer comprises a first capacitor, a second capacitor, a diode gas discharge tube, a first power diode, a second power diode, a first operational amplifier, a second operational amplifier, a third operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a signal conditioning circuit, an analog-digital converter, a microprocessor and a communication interface. A primary sensor is formed by connecting the capacitors with a resistance-capacitance voltage divider in parallel, two routes of signals output by the primary sensor are calculated, fundamental components and harmonic components of primary voltage are measured, the accuracy error problems caused by element nominal error, temperature drift and the like of primary sensors of resistance voltage dividers, capacitance voltage dividers, the resistance-capacitance voltage dividers and the like are solved, the high voltage capacitors can be monitored online, and guarantees are provided for long-time safe running of the transformer.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic measurement, and in particular relates to an electronic voltage transformer capable of simultaneously measuring the fundamental wave and harmonic of the grid voltage, specifically an electronic voltage transformer based on parallel connection of a capacitance and a resistance-capacitance voltage divider . Background technique [0002] Electronic voltage transformer is a kind of voltage sensor, which is mainly used for the measurement of grid voltage. The electronic voltage transformer is an updated product of the traditional electromagnetic voltage transformer, and its basic technical requirements are stipulated by the national standard GB / T20840.7-2007 "Part 7 of the transformer: electronic voltage transformer". [0003] The electronic voltage transformer is mainly composed of a primary voltage converter and a signal processing and transmission system. The primary voltage converter gener...

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Problems solved by technology

This electronic voltage transformer based on the parallel connection of capacitance and resistance-capacitance divider avoids the serious impact of temperature drift and nominal error of capacitance and resistance on the sensing accuracy, and can perform online detection of high-voltage capacitance. It improves the safety of the electronic voltage transformer for long-term operation. Such an electronic voltage transformer based on a primary voltage converter connected in parallel with a capacitor and a resistance-capacitance divider has no patents or other literature reports.

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