Non-contact D-dot voltage transformer and voltage detection self-correcting method thereof

Abstract

The invention discloses a non-contact D-dot voltage transformer, which comprises a high-voltage electricity taking device, a differential amplifier unit, a signal conditioning unit and a collection and transmission unit. The high-voltage electricity taking device is used for obtaining an induction voltage signal on a wire to be tested and transmitting the induction voltage signal to the differential amplifier unit, the signal conditioning unit and the collection and transmission unit sequentially. The high-voltage electricity taking device is provided with a clamp groove, which is in a clamp opening structure and is used for allowing the wire to be inserted in and containing the wire; and after the wire is placed into the clamp groove, the broken part of the clamp groove is combined and fixed. With the adoption of the non-contact D-dot voltage transformer provided by the invention and a correction factor measuring circuit, errors of a detection circuit caused by the influence of geographical environments can be corrected, the non-contact D-dot voltage transformer can be conveniently connected to a voltage wire to be tested, the clamp opening type D-dot voltage transformer is enabled to conveniently measure correction factors in different work environments, and actual voltage in the work environments can be measured accurately, so the influence of the change of the geographical environments on the measurement accuracy of the D-dot voltage transformer is reduced to the maximum extent.

Description

technical field [0001] The invention relates to the field of electric parameter measurement of a smart grid, in particular to an electronic voltage transformer device and a voltage detection and correction method thereof. Background technique [0002] The D-dot sensor realizes the indirect measurement of the voltage by measuring the rate of change of the electric displacement vector in a non-contact manner. The D-dot sensor has the characteristics of simple structure. The electrode near the measured conductor will couple the induced charge through the electric field. When the changing induced charge flows through the measuring resistance connected to the electrode, the resistance voltage drop and the measured conductor potential are measured by the sensor. proportional to the rate of change of the electric field generated by the point. [0003] The existing D-dot sensor is designed with two different equivalent areas and does not pass through the resistance R m The differe...

AI Technical Summary

Problems solved by technology

[0005] However, due to the complex actual working environment of D-dot, its measurement accuracy is easily affected by the terrain environment, which often brings errors to the measurement results; Correction increases difficulty

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