Rogowski coil-based integrator circuit for electronic current transformer

Abstract

The invention relates to a Rogowski coil-based integrator circuit for an electronic current transformer. The integrator circuit consists of a Rogowski coil, a low-frequency gain planarization analog integrator and a signal processing circuit, wherein the Rogowski coil is used for outputting a transient signal to the low-frequency gain planarization analog integrator and outputting a steady-state signal to the signal processing circuit; the low-frequency gain planarization analog integrator is used for processing the transient signal output by the Rogowski coil and is connected with the Rogowski coil and the signal processing circuit; and the signal processing circuit is used for processing an output signal of the low-frequency gain planarization analog integrator and performing digital integration on the steady-state signal output by the Rogowski coil, and then the processed signal is transmitted to a protecting channel and a metering channel through an output interface circuit. The integrator circuit has the advantages of measuring the steady-state signal with high precision, quickly responding to the transient signal, and providing measurement data of the protecting channel and the metering channel at the same time through one Rogowski coil, along with high temperature stability and vibration resistance.

Description

technical field [0001] The invention relates to an integrator circuit, in particular to an integrator circuit for an electronic current transformer based on a Rogowski coil, belonging to the technical field of current measurement. Background technique [0002] In the research of electronic current transformer, the Rogowski coil has been widely concerned as the primary current sensing unit. In the measurement of alternating current, the secondary output voltage signal of the Rogowski coil is the differential of the primary current signal. If you want to restore a signal proportional to the primary current, you must add a corresponding integral link. Therefore, the integrator circuit is a key component in the electronic transformer based on Rogowski coils. [0003] There are two main reasons that affect the measurement accuracy of the Rogowski coil: one is its own characteristics and the installation structure when measuring current, such as the change of its structural para...

AI Technical Summary

Problems solved by technology

However, it is very difficult to use digital integrators to measure transient signals, and it can only be used in occasions that require high measurement accuracy but low requirements for transient response characteristics.

[0004] For Rogowski coils used in electronic current transformers, since the measured current belongs to the category of low-frequency currents, in order to provide transient and steady-state signals for protection and metering equipment at the same time, the design of the integration link will be very important. critical and quite difficult

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