Estimation of Charge, Energy and Polarity of Noisy Partial Discharge Pulses

Journal article (2017)

Authors

A. R. Mor DC systems, Energy conversion & Storage - EEMCS
L.C. Castro Heredia DC systems, Energy conversion & Storage - EEMCS
F.A. Muñoz Muñoz Universidad del Valle
Research Group
DC systems, Energy conversion & Storage (EEMCS) (TU Delft)
Energy Sensors Estimation Partial discharge Charge Frequency-domain analysis Partial discharges Pulse measurements Noise measurement Transmission line measurements Pulse filtering Quasi-integration
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Published Date

2017

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Electrical Sustainable Energy

Research Group

DC systems, Energy conversion & Storage

Abstract

The algorithms for the computation of charge, energy and polarity of partial discharge (PD) pulses are affected by noise, which can lead to over and underestimation of the PD quantities. These quantities can be computed in time domain, frequency domain and according to the impulse response method (standard IEC270). In this paper, a theoretical study is performed in which each computation method is applied to simulated PD pulses having different waveforms and noise level to evaluate the extent of affectation on the results due to the noise. The results suggest that the error in the estimation of the PD charge is higher for oscillatory pulses regardless of the method. In contrast, the estimation of energy is more resilient to the PD waveform and the estimation in frequency domain gives rise to low error. In time domain, the charge an energy estimation method can be improved by filtering the PD pulse and integrating
the output pulse to certain limits. A new method for the estimation of PD polarity is proposed based on the derivative of the filtered pulse, showing accurate estimation of the polarity even for the pulses with low signal to noise ratio.

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