Calibration method for calibrating accuracy and linearity of Rogowski coil proportionality coefficient

Abstract

The present invention provides a calibration method for calibrating the accuracy and the linearity of a Rogowski coil proportionality coefficient and provides two calibration methods for calibrating the linearity of a Rogowski coil for the measurement of power-frequency large currents. According to the first method, N current branches with identical Rogowski coils are connected in parallel and then the current flows through the primary conductor of a to-be-calibrated Rogowski coil. The value of a primary current which flows through the to-be-calibrated Rogowski coil is equal to the sum of the values of primary currents which flow through the Rogowski coils of N current branches. In this way, the linearity of the proportionality coefficient is calculated and obtained. According to the second method, a current branch with a Rogowski coil is adopted. A primary current conductor passes through the primary loop of the to-be-calibrated Rogowski coil in the form of turns N. The value of the primary current which flows through the to-be-calibrated Rogowski coil is equal to N times the value of the primary current which flows through a calibrated Rogowski coil. In this way, the linearity of the proportionality coefficient is calculated and obtained. Based on the above method, the measurement accuracy of the Rogowski coil proportionality coefficient is improved, and the calibration current is expanded. Meanwhile, the linearity of a large-current Rogowski coil can be calibrated.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of power frequency large current measurement, in particular to a calibration method for measuring the accuracy and linearity of the Rogowski coil proportional coefficient for power frequency large current. [0003] 【Background technique】 [0004] With the rapid development of high-voltage power transmission projects, large-capacity laboratories, measurement and protection of transmission and distribution networks, and industrial and mining enterprises have higher and higher requirements for accurate measurement of power frequency large currents. tool, the calibration of its measurement accuracy and linearity becomes very necessary. The accuracy of the existing Rogowski coil proportional coefficient is usually carried out by comparing the test with the standard shunt at a small current. The main disadvantage of this method is that the calibration current of the standard shunt is limited due to the limited curre...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above problems, the present invention provides a calibration method for the accuracy and linearity of the proportional coefficient of the Rogowski coil, which solves the problem that the existing calibration method calibrates the proportional coefficient of the Rogowski coil with small calibration current and low measurement accuracy, and cannot calibrate large The technical problem of the linearity of the current Rogowski coil improves the measurement accuracy of the calibration ratio coefficient of the Rogowski coil, expands the calibration current, and can calibrate its linearity

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