High-precision current comparator

Abstract

The invention provides a high-precision current comparator, which comprises a current transformer assembly and an annular ampere turn balance indicator coaxially arranged in the center of the current transformer, wherein the current transformer assembly comprises a primary iron core, a secondary iron core coaxially arranged in the primary iron core, a corresponding primary winding, a secondary winding, a primary compensation winding and a secondary compensation winding; the ampere turn balance indicator comprises a measurement error compensation winding, a detection winding and a tertiary iron core; the tertiary iron core is arranged in an inner magnetic shielding piece; and the measurement error compensation winding is wound on the inner magnetic shielding piece. The high-precision current comparator provided by the invention has the advantages that influences from magnetic errors and capacitive errors can be reduced; the accuracy level of the current comparator is improved; the current comparator is applied to the highest standard in a self calibration system; the error accumulation value during a measurement downward transfer process can be reduced; the measurement accuracy of the current comparator self calibration system is enhanced; and the accurate application of the current comparator in the industry can be ensured.

Description

technical field [0001] The invention relates to a current comparator, in particular to a high-precision current comparator. Background technique [0002] In order to meet the development needs of industrial technology, various proportional standard devices for measuring power frequency current have been developed, and high-accuracy measurement can be carried out by current proportional standard devices. Today, as the general public and industrial sectors pay more and more attention to energy efficiency and energy saving and consumption reduction, the application of power frequency current proportional precision measurement technology is more and more extensive. [0003] The earliest power frequency current measurement ratio standard is a large current resistor, which is customarily called a shunt. So far, the shunt is still used to measure the power frequency current ratio. The advantages of the resistive shunt are simple structure and high accuracy. However, when this shun...

AI Technical Summary

Problems solved by technology

The accuracy level of the compensated current comparator based on the principle of the existing technology, especially the highest standard compensated current comparator, is difficult to improve, which has become a bottleneck restricting the further improvement of the current proportional precision measurement level.

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