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Energies 2016, 9(5), 383; doi:10.3390/en9050383

An Intelligent Sensor for the Ultra-High-Frequency Partial Discharge Online Monitoring of Power Transformers

1
State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Chongqing University, Chongqing 400044, China
2
Yunnan Electric Power Research Institute, Kunming 650217, China
*
Author to whom correspondence should be addressed.
Academic Editor: Issouf Fofana
Received: 15 February 2016 / Revised: 8 April 2016 / Accepted: 11 May 2016 / Published: 19 May 2016
(This article belongs to the Special Issue Power Transformer Diagnostics, Monitoring and Design Features)
View Full-Text   |   Download PDF [3719 KB, uploaded 19 May 2016]   |  

Abstract

Ultra-high-frequency (UHF) partial discharge (PD) online monitoring is an effective way to inspect potential faults and insulation defects in power transformers. The construction of UHF PD online monitoring system is a challenge because of the high-frequency and wide-frequency band of the UHF PD signal. This paper presents a novel, intelligent sensor for UHF PD online monitoring based on a new method, namely a level scanning method. The intelligent sensor can directly acquire the statistical characteristic quantities and is characterized by low cost, few data to output and transmit, Ethernet functionality, and small size for easy installation. The prototype of an intelligent sensor was made. Actual UHF PD experiments with three typical artificial defect models of power transformers were carried out in a laboratory, and the waveform recording method and intelligent sensor proposed were simultaneously used for UHF PD measurement for comparison. The results show that the proposed intelligent sensor is qualified for the UHF PD online monitoring of power transformers. Additionally, three methods to improve the performance of intelligent sensors were proposed according to the principle of the level scanning method. View Full-Text
Keywords: ultra-high-frequency (UHF); partial discharge (PD); online monitoring; intelligent sensor; level scanning method; field programmable gate array (FPGA); high-speed voltage comparator ultra-high-frequency (UHF); partial discharge (PD); online monitoring; intelligent sensor; level scanning method; field programmable gate array (FPGA); high-speed voltage comparator
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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Li, J.; Li, X.; Du, L.; Cao, M.; Qian, G. An Intelligent Sensor for the Ultra-High-Frequency Partial Discharge Online Monitoring of Power Transformers. Energies 2016, 9, 383.

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