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Energies 2018, 11(8), 1997; https://doi.org/10.3390/en11081997

Partial Discharge Analysis in High-Frequency Transformer Based on High-Frequency Current Transducer

1
Jiangsu Key Laboratory of New Energy Generation and Power Conversion, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
2
State Grid Zhejiang Electric Power Co. Ltd., Research Institute, Hangzhou 310014, China
3
Departamento de Ingeniería Eléctrica, Electrónica, Automática y Física Aplicada, Escuela Técnica Superior de Ingeniería y Diseño Industrial, Universidad Politécnica de Madrid, Ronda de Valencia 3, 28012 Madrid, Spain
*
Author to whom correspondence should be addressed.
Received: 14 July 2018 / Revised: 24 July 2018 / Accepted: 26 July 2018 / Published: 1 August 2018
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

High-frequency transformers are the core components of power electronic transformers (PET), whose insulation is deeply threatened by high voltage (HV) and high frequency (HF). The partial discharge (PD) test is an effective method to assess an electrical insulation system. A PD measurement platform applying different frequencies was set up in this manuscript. PD signals were acquired with a high-frequency current transducer (HFCT). For improving the signal-to-noise (SNR) ratio of PD pulses, empirical mode decomposition (EMD) was used to increase the SNR by 4 dB. PD characteristic parameters such as partial discharge inception voltage (PDIV) and PD phase, number, and magnitude were all analyzed as frequency dependent. High frequency led to high PDIV and a smaller discharge phase region. PD number and magnitude were first up and then down as the frequency increased. As a result, a suitable frequency for evaluating the insulation of high-frequency transformers is proposed at 8 kHz according to this work. View Full-Text
Keywords: partial discharge (PD); high-frequency transformers; power electronic transformers (PET); partial discharge inception voltage (PDIV) partial discharge (PD); high-frequency transformers; power electronic transformers (PET); partial discharge inception voltage (PDIV)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Jiang, J.; Zhao, M.; Zhang, C.; Chen, M.; Liu, H.; Albarracín, R. Partial Discharge Analysis in High-Frequency Transformer Based on High-Frequency Current Transducer. Energies 2018, 11, 1997.

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