Electronic Voltage Transformer Based on Lossy Double Integrator Circuit

Abstract

The invention discloses an electronic type voltage transformer based on a lossy double integrating circuit. The electronic type voltage transformer based on the lossy double integrating circuit comprises a first capacitor, closed-loop iron cores with gaps, a primary coil, a secondary coil, a dipolar gas discharge tube, a two-way voltage-regulator tube, a first operational amplifier, a second operational amplifier, a first resistor, a second resistor, a third resistor, a forth resistor, a fifth resistor, a second capacitor, a third capacitor, a fourth capacitor and an annular shielding box with via holes. According to the electronic type voltage transformer, the second derivative relation between the output voltage of a primary voltage converter and the primary voltage is achieved through the high voltage capacitor and the iron core coils with the gaps; meanwhile, an output signal is restored by using the double integrating circuit, and simultaneous accurate sensing of fundamental waves and harmonic components of the primary voltage is achieved.

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 accurately measuring voltage fundamental waves and harmonics at the same time, in particular to an electronic voltage transformer based on a lossy double integral circuit. Background technique [0002] Electronic voltage transformer is a kind of voltage sensor, which is mainly used for voltage quality analysis, electric energy measurement and safety protection of power grid. The national standard GB / T20840.7-2007 "Transformer Part 7: Electronic Voltage Transformer" specifies the technical requirements for the fundamental accuracy of electronic voltage transformers, while the national standard GB / T20840.8-2007 "Transformer Part 8: Electronic Current Transformer" not only provides technical specifications for electronic current transformers, but also provides technical requirements for harmonic accuracy of...

AI Technical Summary

Problems solved by technology

Since the high-voltage capacitor and the gapped iron core coil realize the second-order derivative relationship between the output voltage and the primary voltage, the signal can be restored by using the double integral circuit, and the fundamental wave and harmonic components of the primary voltage can be easily realized at the same time. Accurate sensing, but such an electronic voltage transformer has no patents and other literature reports

Images