A Complete Analysis for Detection and Localization of Partial Discharges in XLPE Cables, Power Transformers and Generators
Subject Areas : Power Engineering
Amir Ghaedi
1
(Department of Electrical Engineering, Dariun Branch, Islamic Azad University, Dariun, Iran.)
Reza Sedaghati
2
(Department of Electrical Engineering, Beyza Branch, Islamic Azad University, Beyza, Iran)
Mehrdad Mahmoudian
3
(Department of Electrical and Electronic Engineering, Shiraz University of Technology, Shiraz, Iran)
Keywords: Partial Discharge, Power Transformer, XLPE Cable, Correlation, EMTP-RV Software,
Abstract :
The failures of the power system are caused by insulation damages of HV apparatus including transformers, HV cables and generators. They are expensive. In the beginning, insulation failures occure in limited regions of insulation, which is called partial discharge (PD). When PDs are not detected online, they will spread along the insulation and bridge the whole of the insulation that eventually results in total breakdown. Thus, the HV apparatus fails. In this research, different sensors such as HFCT and coupling capacitor required to detect the PD of different HV devices including power transformers, HV cables, switchgears, motors and generators are introduced. The properties of PD signals occurred in HV apparatus is determined by experimental results related to PD signals detected from these HV apparatus. Then, an approach uses the correlation between signals energy is suggested to determine the location of PD occurred in the HV devices. The suitabality of the proposed approach is satisfied by simulating the PD signals in the EMTP-RV software and processing the detected signals by MATLAB software. It is concluded from the experimental outcomes that the suggested sensors can accurately detect the PD signals occurred in the XLPE cables and transformers. The outcomes shown that the suggested method based on the correlation between signals energy can accurately determine the location of PD source in HV devices.
Performing a complete study on various sensors used for partial discharge detecting in the power transformers, high voltage cables and generators.
Localization of partial discharges occurred in the power transformers, high voltage cables and generators through detecting of similarity and correlation of PD signals.
Investigating the effectiveness of localization of PDs in the high voltage apparatus by simulation performed by MATLAB and EMTP-RV software.
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