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Energies 2016, 9(5), 312; doi:10.3390/en9050312

Comparison of Dissolved Gases in Mineral and Vegetable Insulating Oils under Typical Electrical and Thermal Faults

1
The State Key Laboratory of Power Transmission Equipment and System Security and New Technology, College of Electrical Engineering, Chongqing University, Chongqing 400044, China
2
Guangzhou Power Supply Company, Guangzhou 510620, China
3
State Grid Chongqing Changshou Power Supply Company, Chongqing 401220, China
*
Author to whom correspondence should be addressed.
Academic Editor: Issouf Fofana
Received: 15 February 2016 / Revised: 13 April 2016 / Accepted: 18 April 2016 / Published: 25 April 2016
(This article belongs to the Special Issue Power Transformer Diagnostics, Monitoring and Design Features)

Abstract

Dissolved gas analysis (DGA) is attracting greater and greater interest from researchers as a fault diagnostic tool for power transformers filled with vegetable insulating oils. This paper presents experimental results of dissolved gases in insulating oils under typical electrical and thermal faults in transformers. The tests covered three types of insulating oils, including two types of vegetable oil, which are camellia insulating oil, Envirotemp FR3, and a type of mineral insulating oil, to simulate thermal faults in oils from 90 °C to 800 °C and electrical faults including breakdown and partial discharges in oils. The experimental results reveal that the content and proportion of dissolved gases in different types of insulating oils under the same fault condition are different, especially under thermal faults due to the obvious differences of their chemical compositions. Four different classic diagnosis methods were applied: ratio method, graphic method, and Duval’s triangle and Duval’s pentagon method. These confirmed that the diagnosis methods developed for mineral oil were not fully appropriate for diagnosis of electrical and thermal faults in vegetable insulating oils and needs some modification. Therefore, some modification aiming at different types of vegetable oils based on Duval Triangle 3 were proposed in this paper and obtained a good diagnostic result. Furthermore, gas formation mechanisms of different types of vegetable insulating oils under thermal stress are interpreted by means of unimolecular pyrolysis simulation and reaction enthalpies calculation. View Full-Text
Keywords: vegetable insulating oil; electrical fault; thermal fault; dissolved gas analysis (DGA); fault diagnosis; gas formation mechanism vegetable insulating oil; electrical fault; thermal fault; dissolved gas analysis (DGA); fault diagnosis; gas formation mechanism
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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MDPI and ACS Style

Xiang, C.; Zhou, Q.; Li, J.; Huang, Q.; Song, H.; Zhang, Z. Comparison of Dissolved Gases in Mineral and Vegetable Insulating Oils under Typical Electrical and Thermal Faults. Energies 2016, 9, 312.

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