Abstract
An electronic current transformer with a B-dot sensor is proposed in this study. The B-dot sensor can realize the current measurement of the transmission line in a non-contact way in accordance with the principle of magnetic field coupling. The multiple electrodes series-opposing structure is applied together with differential input structures and active integrating circuits, which can allow the sensor to operate in differential mode. Maxwell software is adopted to model and simulate the sensor. Optimization of the sensor structural parameters is conducted through finite-element simulation. A test platform is built to conduct the steady-state characteristic, on-off operation, and linearity tests for the designed current transformer under the power-frequency current. As shown by the test results, in contrast with traditional electromagnetic CT, the designed current transformer can achieve high accuracy and good phase-frequency; its linearity is also very good at different distances from the wire. The proposed current transformer provides a new method for electricity larceny prevention and on-line monitoring of the power grid in an electric system, thereby satisfying the development demands of the smart power grid.
Highlights
In a power system, the accurate measurement of power-frequency current is an important approach in ensuring the reliable operation of a power distribution network
The accuracy, convenience, and speed of current transformers play a significant role in electric energy measurement, system monitoring and diagnosis, and power system fault analysis in smart power grids
The method of current measurement by using Rogowski coil has been proposed [2,3], resulting in high measurement accuracy and good transient response. This kind of method based on the Rogowski coil targets high-frequency lightning current measurements, pulse current measurements, and partial discharge measurements on power cables, and the current loop to be measured must pass through the coil [4,5,6,7,8,9,10,11,12,13]
Summary
The accurate measurement of power-frequency current is an important approach in ensuring the reliable operation of a power distribution network. The method of current measurement by using Rogowski coil has been proposed [2,3], resulting in high measurement accuracy and good transient response. Most studies based on the B-dot principle focus on high-frequency current measurement (MHz, kA level) by a sensor under the self-integral state, such as in a lightening. Focus on high-frequency current measurement (MHz, kA level) by a sensor under the self-integral state, such as in a lightening current and plasma discharge pulse current [18,19,20,21]. Proposed transformer has the following has advantages: goodadvantages: phase-frequency phase-frequency characteristic, good linearity, simple structure, and easy installation.
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