Electronic Voltage Transformer Based on Double Capacitor and Rogowski Coil with Gap

Abstract

The invention discloses an electronic voltage transformer based on a double capacitor and a gapped iron core type Rogowski coil, which includes a first high voltage capacitor, a second high voltage capacitor, a first closed loop iron core with a gap, a second gapped Closed-loop iron core, first primary coil, second primary coil, first secondary coil, second secondary coil, first annular shielding box with vias, second annular shielding box with vias, low-voltage arm resistance, Signal conditioning circuit, analog-to-digital converter, microprocessor and communication interface; the transformer of the present invention utilizes double capacitors and band-gap iron core type Rogowski coils to form a primary sensor, and calculates and processes the two-way signals output by the primary sensor, Realize the measurement of primary voltage, overcome the problem of accuracy error caused by component nominal error and temperature drift of the primary sensor composed of capacitive voltage divider, RC voltage divider and single high-voltage capacitor and miniature current transformer, and can be online Monitor the high-voltage capacitance to provide guarantee for the long-term safe operation 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 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...

AI Technical Summary

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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