Series addition checking method and device of voltage transformer

Abstract

The invention provides a series addition checking method and a device based on a semi-insulating voltage transformer. The device comprises a symmetrical high-voltage testing power supply, a three-port series voltage transformer, the semi-insulating voltage transformer and an error measuring device. According to the characteristics of the series addition checking method and the device based on the semi-insulating voltage transformer, complete equipment for tracing a source of a mains-frequency voltage proportional quantity value can be manufactured, and according to a series addition checking line based on the semi-insulating voltage transformer, through measuring a relative error between the three-port series voltage transformer and the semi-insulating voltage transformer and carrying out a mathematical treatment on a measurement result, a voltage coefficient curve of the error of the semi-insulating voltage transformer can be obtained. The method is convenient to operate and is not limited by a voltage class, and a mains-frequency voltage proportional standard quantity value system from a low voltage of 10 V to a high voltage of 1000 kV can be established and is used as a national or provincial measurement standard.

Description

technical field [0001] The invention relates to a voltage transformer error calibration method and a calibration device, which belong to the scientific and technical field of measurement and precision testing, and in particular to a voltage transformer series addition calibration method and device. Background technique [0002] In order to ensure the fairness, accuracy and standardization of electric energy measurement, and to clarify and guarantee the interests of power generation, transmission and power supply, according to the relevant provisions of my country's metrology law, compulsory verification of measuring transformers must be carried out on a regular basis. To carry out this work, it is necessary to have A standard instrument of measurement that provides a standard value. [0003] Among them, the standard voltage transformer is an important power frequency voltage proportional measuring instrument that is easy to use and stable in value. There are three main method...

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Problems solved by technology

[0004] However, this method still has voltage coefficient estimation during the use process. During the calibration process, due to the imperfect shielding, when the shielding potential changes, the leakage current flows through the excitation winding, which affects the measurement uncertainty of the standard device to a certain extent.

Moreover, the line is based on the characteristics of fully insulated voltage transformers, which determines that its applicable voltage level is not higher than 220kV, which cannot meet the application requirements of higher voltage levels.

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