DC voltage transformer synchronization calibration method and system

Abstract

The invention discloses a DC voltage transformer synchronization calibration method and system; the method comprises the following steps: receiving a standard analog quantity voltage value of a standard DC attenuator; receiving an analog quantity voltage value of a calibrated DC voltage transformer in the same time; obtaining a digital quantity secondary voltage value of the calibrated DC voltage transformer; calculating the digital quantity primary voltage value of the calibrated DC voltage transformer according to the digital quantity secondary voltage value; calibrating the DC voltage transformer according to the analog quantity voltage value, the standard analog quantity voltage value, the digital quantity secondary voltage value and the digital quantity primary voltage value; evaluating the precision of calibrated DC voltage transformer according to calibration result. The method can synchronically measure and calibrate the analog quantity voltage value and the digital quantity secondary voltage value outputted by the calibrated DC voltage divider, and integrally evaluate the precision of the calibrated DC voltage transformer according to the calibration results.

Description

technical field [0001] The invention relates to the field of on-site testing of DC voltage transformers, in particular to a method and system for synchronous calibration of DC voltage transformers. Background technique [0002] In the power system, in order to ensure the normal power supply and protect the safety of valuable equipment, there is a set of relay protection circuit composed of various relay control equipment. When a fault occurs in the power system, these protection devices will act to cut off the faulty line. If it is an accidental fault, it can also automatically close the switch to ensure normal power supply. DC voltage transformer is the main equipment for measuring DC voltage in the DC transmission system, which provides control and protection for the safe and stable operation of the DC transmission system. In order to ensure the accuracy and reliability of the measurement signal of the DC voltage transformer, on-site calibration of the DC voltage transfor...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a DC voltage transformer on-site closed-loop control calibration method and system to solve the problem of low accuracy of the existing DC voltage transformer control calibration method

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