Correction method for instrument voltage transformer

A technology of voltage transformer and correction method, which is applied to instruments, measuring electrical variables, measuring devices, etc., can solve the problems of inability to calibrate the voltage transformer for instruments, manual operation of differential compensation, and high requirements for transformation accuracy, so as to save labor Operating time, elimination of magnetic measurement errors and capacitive coupling errors, effect of high conversion accuracy
CN103018704BActive Publication Date: 2015-02-04广州市格宁电气有限公司 +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
广州市格宁电气有限公司
Publication Date
2015-02-04

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Abstract

The invention discloses a correction method for an instrument voltage transformer, and comprises the steps of: firstly combining at least two inductive voltage dividers in a primary-secondary cascade connection, and configurating the transformation ratio tap positions of a primary inductive voltage divider and a secondary inductive voltage divider to enable the transformation ratio after the primary-secondary cascade connection combination to be the same as that of a certain tap position of the instrument voltage transformer; then obtaining errors of the primary inductive voltage divider and the secondary inductive voltage divider by self-correcting and verifying; and finally calibrating the self-corrected and verified primary inductive voltage divider and secondary inductive voltage divider to be a voltage ratio criterion, and comparatively transmitting the voltage ration criterion to the instrument voltage transformer to realize the correction of the change of a certain tap position of the instrument voltage transformer. The correction method for the instrument voltage transformer can improve the correction accuracy of voltage / voltage conversion under the condition of a low-voltage output of the instrument voltage transformer.
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Description

technical field

[0001] The invention relates to a calibration method of a standard device, in particular to a calibration method of an instrument voltage transformer. Background technique

[0002] The function of the instrument voltage transformer is to transform the high voltage into a low standard secondary voltage in proportion to the use of protection, metering and instrumentation devices. Due to the needs of electronic measurement in the fields of industry, military, metrology, scientific research and other fields, the technology of precision instruments and meters has developed rapidly, and new technical requirements for instrument voltage transformers have emerged:

[0003] 1) The output voltage is below 10V, such as the secondary rated output of the electronic voltage transformer used in the digital substation of the smart grid is 4V.

[0004] 2) The accuracy of conversion from input to output is required to reach the ppm level, such as the 50-100-200-400V / 4V voltag...

Claims

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