Inductively coupled probe for the measurements of partial discharges

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http://dx.doi.org/10.1063/1.2924207

G. Robles, J. M. Martínez, M. Rojas, J. Sanz. Inductively coupled probe for the measurements of partial discharges, Review of Scientific Instruments, Vol. 79, Issue 5, pp. 055104, May. 2008

Abstract – Partial discharges are a transient phenomena whose measurement is remarkably important for electrical equipment diagnosis and maintenance. These discharges appear in the measurement circuit as very narrow current pulses of some nanoseconds. Therefore, discharge pulse detection is a particularly difficult problem, especially because they are superimposed on the high voltage waveforms that cause them. In this paper we present an inductively coupled probe able to measure this physical phenomenon by means of a very simple and inexpensive device that can be installed in the equipment under test. After modeling the probe, its response will be compared to that of commercial devices using both calibrated discharges and partial discharges occurring at real power.