Rogowski coil with a non-inverting integrator used for impulse current measurement in high-voltage tests

Abstract

This paper presents design and construction of an impulse current measuring system based on a Rogowski coil with a non-inverting integrator used for impulse current measurement in high-voltage tests. For convenience in current measurement in the high-voltage tests, the developed Rogowski coil is specifically designed as a clamp on device. For verification, the developed current measuring system was tested in comparison with a non-inductive shunt resistor and the same Rogowski coil with previous developed integrators. The various standard impulse currents, i.e. the steep impulse current (1/20μs), the high impulse current (4/10μs), the lightning impulse current (8/20μs), the switching impulse current (30/80μs), and the long-duration impulse currents with duration time of 1−3ms were generated for comparative measurement in a high-voltage laboratory. From the experimental results, the developed Rogowski coil with the proposed non-inverting integrator has fairly high accuracy in wide frequency bandwidth covered the frequency bandwidth of the standard impulse currents in high-voltage tests. It can be concluded that the developed current measuring system has a promising characteristic being appropriate for measurement of impulse currents in high-voltage tests.