High- and low-voltage hybrid excitation double-stage voltage transformer and calibration method thereof

Abstract

The invention provides a high- and low-voltage hybrid excitation double-stage voltage transformer and a calibration method thereof. The double-stage voltage transformer comprises a main voltage transformer 1 and an auxiliary voltage transformer 2, wherein the main transformer 1 comprises a first-stage iron core I, a second-stage iron core II, a primary winding W1, a second winding W2, a high-voltage excitation winding W3 and a low-voltage excitation winding W4, the low-voltage excitation winding W4 and the high-voltage excitation winding W3 are sequentially wound around the first-stage iron core I, the second winding W2 and the primary winding W1 are sequentially wound after the first-stage iron core I and the second-stage iron core II are laminated, the auxiliary voltage transformer 2 is used for performing excitation on the main voltage transformer and comprises an iron core, an auxiliary primary winding W5, an auxiliary second winding W6 and a power supply winding W7, the auxiliary primary winding W5, the auxiliary second winding W6 and the power supply winding W7 are sequentially wound around the iron core, the auxiliary primary winding W5 is connected with the primary winding W1 and the high-voltage excitation winding W3 of the main voltage transformer, and the auxiliary secondary winding W6 is connected with the low-voltage excitation winding W4 of the main voltage transformer.

Description

technical field [0001] The invention relates to the technical field of voltage ratio precision measurement, and more specifically, to a high-low voltage hybrid excitation double-stage voltage transformer and a calibration method thereof. Background technique [0002] The power frequency voltage ratio standard is the key equipment for traceability and transmission of the power frequency voltage value, and an important measurement standard device used to reproduce the power frequency voltage ratio. With the improvement of the accuracy of electric energy measurement, higher requirements are put forward for the accuracy of the transformer. Therefore, it is necessary to study the voltage ratio standard device with high accuracy level and good stability. At present, there are mainly three types of power frequency voltage ratio standards commonly used in the world: resistive, capacitive and electromagnetic. Due to the influence of resistance temperature rise and capacitive leakage...

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Problems solved by technology

However, if the high-voltage excitation method is used, the capacitive leakage will be large due to the existence of high potential. If the low-voltage excitation method is used, the error of the auxiliary voltage transformer will be introduced, which will affect the compensation effect.

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