Miniature voltage transformer self-calibration method

Abstract

The invention discloses a miniature voltage transformer self-calibration method, which comprises the following steps: S1) using a 600 V single-disc two-stage induction voltage divider as a main standard instrument, and deriving a reference ratio thereof through a reference voltage method; S2) using a 100V seven-disc two-stage induction voltage divider as an auxiliary standard instrument, and deriving a fraction ratio; S3) carrying out self-calibration to obtain errors of the main standard instrument and the auxiliary standard instrument; and S4) the two induction-type voltage ratio standard instruments being cascaded, and through ratio multiplication, obtaining a new ratio; and using multiple two-stage voltage transformers having fixed voltage ratios as work standard, carrying out quantity transfer and comparing quantity transferred to a miniature voltage transformer to realize self-calibration of the miniature voltage transformer. The voltage transformer is always utilized as a standard instrument in the quantity transfer process, so that quantity misalignment accident due to setting error of the inductive voltage divider can be reduced, and quantity transfer quality and level can be improved effectively. The method is used for improving accuracy of the standard instrument.

Description

technical field [0001] The invention relates to the technical field of miniature voltage transformers, in particular to a self-calibration method for miniature voltage transformers. Background technique [0002] With the development of semiconductor technology in the 1960s, industrial control gradually replaced traditional electromechanical devices with electronic components, and control devices such as relays and switches with high energy consumption and low intelligence were constantly replaced by electronic devices. At present, almost all Substations and power plants in China are controlled by electronic technology and digital technology, a large number of automated production lines are used in the manufacturing industry, and electronic control technology is also widely used in the transportation industry such as electrified railways. In terms of working principle, electronic components only need small signal input, while traditional current and voltage sensors are design...

AI Technical Summary

Problems solved by technology

The built-in micro-voltage proportional standard of the micro-voltage transformer calibration device currently used in the market does not carry out traceability of the value, but is only calculated based on the error principle of the multi-disc induction voltage divider, which does not meet the requirements of metrology.

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