Electronic voltage transformer based on two capacitors and gap iron core type Rogowski coils

Abstract

The invention discloses an electronic voltage transformer based on two capacitors and gap iron core type Rogowski coils. The electronic voltage transformer comprises the first high-voltage capacitor, the second high-voltage capacitor, a first closed-loop iron core with a gap, a second closed-loop iron core with a gap, a first primary coil, a second primary coil, a first secondary coil, a second secondary coil, a first annular shielding box with a via hole, a second annular shielding box with a via hole, a low-voltage arm resistor, a signal conditioning circuit, an analog-digital converter, a microprocessor and a communication interface. According to the transformer, a primary sensor is formed by the two capacitors and the gap iron core type Rogowski coils, measurement of primary voltages is achieved by calculating and processing two paths of signals output by the primary sensor, element nominal errors and accuracy errors caused by temperature drift of the primary sensor composed of a capacitive voltage divider, a resistance-capacitance voltage divider, one high-voltage capacitor and a minitype current transformer are avoided, the high-voltage capacitors can be monitored in an on-line mode, and long-term safe operation of the transformer is guaranteed.

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 measuring grid voltage, in particular to an electronic voltage transformer based on double capacitors and an iron-core Rogowski coil with a gap. Background technique [0002] Electronic voltage transformer is a voltage sensor used to measure grid voltage. Its basic technical requirements are stipulated by the national standard GB / T20840.7-2007 "Part 7 of Transformer: Electronic Voltage Transformer". It is a traditional It is an updated product of the electromagnetic voltage transformer. The electronic voltage transformer is mainly composed of a primary voltage converter and a signal processing and transmission system. The primary voltage converter is used to convert the primary voltage into a low-voltage signal suitable for measurement. The signal is transmitted to the secondary equipment through the sig...

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Problems solved by technology

This electronic voltage transformer based on double capacitors and gapped iron-core Rogowski coils avoids the serious impact of high-voltage capacitor temperature drift and nominal error on sensing accuracy, and can perform online monitoring of high-voltage capacitors and other components. The detection improves the safety of the electronic voltage transformer for long-term operation. Such an electronic voltage transformer based on double capacitors and a gap iron-core Rogowski coil has no patents or other literature reports.

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