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Investigation of the Influence of electrical parameters on dynamic property of Self-integrating Rogowski coil

Rong L., Ji-sheng L., Yang-yu F.

Przegląd Elektrotechniczny

2013

R. 89, nr 4

115-119

Rogowski coil as the special mutual inductor is often applied to measure high amplitude and transient currents in electrical industry. Since there are no iron core, they cannot be driven into saturation. In this paper, the transfer function of the self-integrating Rogowski is proposed based on the analysis of the Rogowski coil. According to the transfer function, bode diagram simulates the effect of changing some of these parameters. Also, the influences of self-inductance, sampling resistance and stray capacitance are disussed in details. Moreover, a high-frequency current transducer for measurement of PD is developed based on the self-integrating Rogowsk,and the actual dynamic response are performed by adopting function generator. Based on the transducer, measurements of PD of needle-plate model under impulse voltage is identical to the results of theory analysis. Finally, the method to obtain an optimum dynamic property in self-integrating Rogowski coil is suggested.

W artykule wyznaczono charakterystykę przetwarzania paska Rogowskiego bez układu całkującego. Wyznaczono charakterystyki częstotliwościowe czujnika prądu a następnie sprawdzono parametry na przykładzie badania wyładowań niezupełnych.

Design of Rogowski Coil with external integrator for measurement of lightning current up to 400kA

Li Z., Zhang Q., Zhang L., Liu F., Tan X.

Przegląd Elektrotechniczny

2011

R. 87, nr 7

188-192

Lightning is one of the most serious disasters in the electrical power grid, especially in the ultra-high and extra-high voltage power systems. The measurement of the lightning current parameters is of great importance for the investigation of lightning protection. The literature shows given its significant advantages over equivalent current transducers, the Rogowski coil is an increasingly popular method for current measurement of high amplitude and high frequency. However, there is little report focus on the lightning measurement on the transmission lines. In this paper, the lumped parameter model of the Rogowski coil with an external integrator is established to deduce the transfer functions as well as the bandwidth of the coil. Relationships between the sensitivity and coil parameters, such as coil dimension, integral parameters and number of turns of the coil, are investigated. Results show that the sensitivity of the coil increases with the increase of the sectional area and number of turns, or with the decrease of effective magnetic path, resistance and capacitance of the integrator. Based on the analysis of the experimental results, a Rogowski coil of the bandwidth from 2 kHz to 2 MHz and average sensitivity of 0.1144V/kA is developed for the measurement of lightning current up to 400kA. Furthermore, it is found that the measuring uncertainty is always caused by the off-center position of the current flowing through the coil. Combined with the affiliate circuit, the lightning current transducer is used to measure and locate the lightning current on the transmission line based on the designed Rogowski coil with external integrator.

Pomiary prądów wyładowań atmosferycznych odgrywają dużą rolę w zabezpieczeniach. Obecnie pasek Rogowskiego staje sioę coraz popularniejszym narzędziem pomiaru prądów o dużej amplitudzie i dużej częstotliwości. W artykule przedstawiono cewki Rogowskiego w zastosowaniu do pomiarów w liniach przesyłowych. Zaprojektowano czujnik o pasmie częstotliwości 2 kHz - 2 MHz i czułości 114 mV/kA.