Abstract
Partial Discharge (PD) current measurements have been widely used to assess the insulation condition of power components. Rogowski coil is a low cost current sensor specifically meant for high frequency transient diagnostics such as PDs in high voltage (HV) power apparatus. This paper presents the design of Rogowski coil for transient measurements. For the designed prototype of Rogowski coil, correct selection of terminating resistance is of high importance to calibrate its response for accurate measurement of the PD current waveforms. Effect of terminating resistance for the coil model is analysed based on theoretical, practical and simulated investigations. Simulated model of the coil is used to determine the behaviour of induced current through non-physical inductive and capacitive elements of Rogowski coil. The Electromagnetic Transient Program-Alternative Transient Program (EMTP-ATP) is used to implement and to analyze the model of Rogowski coil. The comparison of practical and simulated results validates the designed model of the coil. The paper explores EMTP-ATP as an efficient tool to analyze and modify the transient behaviour of Rogowski coil for high frequency pulse measurements.DOI: http://dx.doi.org/10.5755/j01.eee.19.7.2070
Highlights
Electrical power networks are always exposed to different types of faults that may harm the power supply continuity
Partial Discharge (PD) is the process of localized dielectric breakdown event in defects of a solid or a liquid electrical insulation which is under high voltage (HV) stress [1]
A high frequency transient signal shown in Fig. 4 is considered for measurement using the simulated model of coil in EMTP-ATP software
Summary
Electrical power networks are always exposed to different types of faults that may harm the power supply continuity. Waveform together present an electromagnetic wave which travels along the power line at speed of light Measurement of these extremely fast pulses can provide the information where the insulation degradation is happening, how far it has progressed and how fast it is progressing. Recent research points out that accurate assessment of PD faults requires complete information of pulse waveform and this step requires wider frequency band current sensors [2]. A Rogowski coil having low number of turns is implemented and its performance is evaluated for low amplitude high frequency current pulses. Damping effect of terminating resistance on the output voltage of the coil is analysed in detail using theoretical, practical and simulated model of RC. The designed model of the Rogowski coil is verified based on the simulated analysis. The comparison between real and simulated model validates the transient response of the coil
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