Current transformer for current detection of multiple busbars and current detection method thereof

Abstract

The invention discloses a current transformer for multi-channel bus current detection, comprising a sensing light source, a fast optical attenuator, a signal conditioning module and a signal demodulation module; the output end of the sensing light source and the optical The input terminal is connected; the electrical input terminal of the fast optical attenuator is connected with the output terminal of the signal conditioning module; the optical output terminal of the fast optical attenuator is connected with the input terminal of the signal demodulation module; the signal conditioning module includes a working point setting module, a second An adder and n parallel current conditioning units, and the signal demodulation module includes a photoelectric receiver and n parallel current demodulation units. The current transformer has the function of low power consumption, and can accurately measure the current of multiple busbars at the same time. At the same time, a bus current detection method of the current transformer is also disclosed. The detection method has the effect of high measurement accuracy and can simultaneously measure multiple bus currents.

Description

technical field [0001] The invention belongs to the field of power system monitoring and protection, and in particular relates to a current transformer for multi-channel bus current detection and a current detection method thereof. Background technique [0002] With the rapid development of the national economy, the demand for electricity is increasing. The power system has corresponding information and control systems in each link and at different levels, and measures, adjusts, controls, protects, communicates and dispatches the production process of electric energy to ensure that users obtain safe, economical and high-quality electric energy. Measuring current is a routine means of obtaining information about power systems. At present, the traditional electromagnetic current transformers widely used in power systems have problems such as magnetic saturation, electromagnetic interference, small dynamic range, narrow frequency band range, and inflammability and explosion. ...

AI Technical Summary

Problems solved by technology

In 2001, Huazhong University of Science and Technology proposed an OCT solution using Rogowski coils, integrators and voltage-frequency converters, using the traditional CT energy supply solution, but due to the large power consumption of the voltage-frequency converter, the overall power consumption of OCT Not significantly reduced

The disadvantage of this solution is that the measurement device is susceptible to interference from external temperature and magnetic field, and the measurement accuracy is not high

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