Onsite stable state precision calibration system of electronic voltage transformer and calibration method thereof

Abstract

The invention provides an onsite stable state precision calibration system of an electronic voltage transformer and a calibration method thereof. The method comprises the steps: a, the electronic voltage transformer is connected with a standard voltage transformer in parallel, and the same test voltage is applied to the standard voltage transformer and the tested electronic voltage transformer; b, a secondary analog voltage signal of the standard voltage transformer is converted into digital quantity in a manner of analog-to-digital conversion and the digital quantity is transmitted to an analysis processing unit of an electronic transformer stable state calibration system; c, the digital quantity output by the electronic voltage transformer is subjected to photoelectric conversion and then is connected with the host of the electronic transformer stable state calibration system via an Ethernet line; and d, the electronic transformer stable state calibration system analyzes and processes the acquired digital quantity of a standard voltage signal and the digital quantity output by the electronic transformer through the analysis processing unit to obtain a calibration value for specimens. The method provided by the invention can realize the stable state calibration for the onsite electronic voltage transformer, and has high calibration precision, speed and efficiency.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to an on-site steady-state accuracy verification system and a verification method for electronic voltage transformers. Background technique [0002] Before the electronic voltage transformer is installed and put into operation, the on-site steady-state accuracy verification is generally carried out. When the preventive test or maintenance is carried out after several years of operation, the steady-state accuracy verification is usually also carried out. [0003] The output of the traditional voltage transformer is an analog signal, and its steady-state verification system performs the verification between the analog quantity and the analog quantity. The output of the electronic voltage transformer is a digital signal, and it is necessary to check the digital quantity and the analog quantity during the on-site steady-state calibration. Due to the major changes in the principle ...

AI Technical Summary

Problems solved by technology

Due to the major changes in the principle and output mode of electronic voltage transformers and traditional transformers, the existing calibration methods for traditional voltage transformers cannot be used on electronic voltage transformers.

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