Electronic type voltage transformer based on capacitor and resistance-capacitance voltage divider parallel connection
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A technology of resistance-capacitance voltage divider and voltage transformer, applied in the field of electromagnetic measurement
Active Publication Date: 2015-07-08
CHINA JILIANG UNIV
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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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[0032] The electronic voltage transformer based on the parallel connection of capacitance and resistance-capacitance voltage divider proposed by the present invention, its embodiment is as follows figure 1 As shown, it includes a first capacitor 1, a second capacitor 7, a diode gas discharge tube 2, a first power diode 3, a second power diode 4, a first operational amplifier 5, a second operational amplifier 9, and a third operational amplifier 14. First resistor 6, second resistor 8, third resistor 10, fourth resistor 11, fifth resistor 12, sixth resistor 13, signal conditioning circuit 15, analog-to-digital converter 16, microprocessor 17 and communication interface 18; one end of the first capacitor 1 is respectively opposite to one end of the diode gas discharge tube 2, the anode of the first power diode 3, the cathode of the second power diode 4, one end of the first resistor 6, and the first operational amplifier 5 The input ends are connected, the other end of the diode...
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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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