Influence of High Frequency Current Transformers Bandwidth on Charge Evaluation in Partial Discharge Measurements

[EN] High frequency current transformers (HFCT) are now widely used for partial discharges detection and measurement, specially for partial discharge location and source identification. However, many difficulties arise due to HFCT in the determination of the apparent charge in picocoulombs (pC) because of large variations according to sensors or pulses shapes. Some authors are even using milivolts (mV) as representative magnitude. As a result, measurements carried out using HFCT are not comparable in terms of apparent charge determination. In this paper, a new method of charge evaluation by means of HFCT is described solving the calibration procedure according to the sensor bandwidth and providing a criterion for sensors evaluation.This work has been supported by IMPIVA (Instituto de la Mediana y Pequena Empresa Valenciana) which is attached to the "Conselleria de Industria, Comercio e Innovacion" of the Valencia Regional Government (Industry, Trade and Innovation Regional Minister; project reference number is MIDIC/2009/157) and the European Regional Development Fund (ERDF) from the European Commission.Rodrigo Mor, A.; Llovera Segovia, P.; Fuster Roig, VL.; Quijano Lopez, A. (2011). Influence of High Frequency Current Transformers Bandwidth on Charge Evaluation in Partial Discharge Measurements. IEEE Transactions on Dielectrics and Electrical Insulation. 18(5):1798-1802. https://doi.org/10.1109/TDEI.2011.60328521798180218