Electronic current transformer based on Rogowski coil and characteristic analysis method thereof

Abstract

The invention discloses an electronic current transformer based on a Rogowski coil. The electronic current transformer comprises a Rogowski coil equivalent circuit, an amplifying circuit and an integrating circuit. The integrating circuit is connected to the Rogowski coil equivalent circuit through the amplifying circuit. The Rogowski coil equivalent circuit in an established Rogowski coil electronic current transformer model is used for allowing coil parameters to be equivalent, and a voltage signal is outputted through a sampling resistor. The amplifying circuit amplifies a small voltage signal outputted from the coil to be used by subsequent integral components. A final integration circuit is the most important part, firstly, a good integration step can amplify a signal to be restored,the accuracy of measurement can be ensured, and errors are reduced. On the other hand, the signal can be optimized, and useless interference is filtered. The simulation is carried out according to theestablished Rogowski coil electronic current transformer model and the characteristics are analyzed, and technical support is provided for the electronic current transformer in the practical process.

Description

technical field [0001] The technical field of the current transformer of the present invention specifically relates to an electronic current transformer based on a Rogowski coil and a characteristic analysis method thereof. Background technique [0002] With the formation of the power grid pattern of "West-to-East Power Transmission, North-South Interconnection, and National Networking", my country's power system is developing rapidly in the direction of large capacity and high voltage. It is an important component in the relay protection system for tasks such as providing real and reliable electrical quantities for secondary equipment. With the continuous improvement of the grid voltage level and the increasing capacity of the power system, traditional electromagnetic current transformers have exposed disadvantages such as difficult insulation and insufficient linear operating range in actual operation, which cannot meet the requirements of intelligent and digital power syst...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies described in the above-mentioned prior art, the present invention provides an electronic current transformer based on Rogowski coils and its characteristic analysis method, which is for the overall design, development and analysis of the steady-state characteristics and transient state of the electronic current transformer. The characteristics are researched to provide analysis platform and experimental data. The obtained experimental data is used for the research and development of the key technology of the overall anti-vibration performance of electronic current transformers, and solves the problem of its low reliability compared with traditional transformers and the difference with traditional electromagnetic current transformers. When transformers are mixed in relay protection, the collected data cannot be synchronized, and the transmission and transformation characteristics are different, which will cause compatibility problems such as relay protection misoperation

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