Design and Experimental Study of a Current Transformer with a Stacked PCB Based on B-Dot

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.

High Sensitivity Differential Giant Magnetoresistance (GMR) Based Sensor for Non-Contacting DC/AC Current Measurement

“…Contactless current measurement devices are based on detection of the magnetic field created by the current. When only the AC current component is measured, the most used devices are based on current transformers and Rogowski coils [1][2][3]. However, to measure DC/AC currents, sensors able to detect DC magnetic fields with high accuracy must be used.…”

Contactless measurement of electric current using magnetic sensors

“…Shielding improves their bandwidth and reduces parasitic capacitive coupling [70]. The B-Dot sensor works on the same principle as a Rogowski coil, using flat coils made of multilayer PCB [71].…”

Rectangular Array Electric Current Transducer with Integrated Fluxgate Sensors

“…Rogowski coils and similar devices are coreless, but they can measure only the AC currents [5]. First approach for measuring the DC/AC current are the transducers without yoke.…”