A high-precision electronic current transformer with iron core coils containing air gaps

Abstract

A high-precision electronic current transformer with iron core coils containing air gaps comprises a high-voltage side sensing unit, a low-voltage side data acquisition transmission unit and a high-voltage housing. The high-voltage side sensing unit comprises two coils containing air gaps and a hollow coil. The three coil sensors are arranged in a grounding shielding case. The coil sensors are connected to the low-voltage side data acquisition transmission unit positioned in a pedestal through a shielding cable. According to the invention, the high-precision electronic current transformer with the iron core coils containing the air gaps employ the two iron core coils containing the air gaps and the hollow coil to measure currents in a primary conductive wire; firstly, the average value of the output of the iron core coils containing the air gaps are measured; the average value and the output of the hollow coil are then subjected to comprehensive processing to obtain an average value to be used as a final output, thus solving of the problems of low measurement accuracy of a single iron core and reducing common mode interferences; the measurement accuracy is raised; self-diagnosis of a mutual inductor is realized; and the intelligent level is raised.

Description

technical field [0001] The invention discloses a high-precision electronic current transformer with an air gap in an iron core coil, which is used for real-time and high-precision measurement of current signals of transmission lines in intelligent substations. Background technique [0002] The accuracy and reliability of electronic current transformers are the guarantee for the safe and reliable operation of power systems. With the development and progress of technology, the relevant research on electronic transformers has become more and more in-depth, and there are more and more types of transformers. However, because the electronic transformer is still a new technology, there are still some problems in its operation, the most prominent problem is that the measurement accuracy is not high. An electronic transformer disclosed in Chinese patent CN101707129A uses an optical element as a sensor. Chinese patent CN203838218U discloses an electronic current transformer powered ...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of low measurement accuracy and inflexible measurement of current electronic current transformers, the present invention proposes a high-precision air-gap iron core coil with simple structure, easy manufacture, good reliability, flexible measurement and high accuracy. For electronic current transformers, the high-voltage side sensing unit uses an air-core coil and two coils with air-gap iron cores, and uses the comprehensive output of the three coils as the final output, which can more effectively improve the measurement accuracy of the transformer

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