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Open AccessArticle

Accumulation Behaviors of Different Particles and Effects on the Breakdown Properties of Mineral Oil under DC Voltage

by 1,2, 1,*, 1, 3,4, 3,4 and 3,4
1
State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
2
State Grid Chongqing Nanan Power Supply Company, Chongqing 401223, China
3
Najing NARI Group Corporation, State Grid Electric Power Research Institute, Nanjing 211000, China
4
Wuhan NARI Co. Ltd., State Grid Electric Power Research Institute, Wuhan 430077, China
*
Author to whom correspondence should be addressed.
Energies 2019, 12(12), 2301; https://doi.org/10.3390/en12122301
Received: 19 May 2019 / Revised: 5 June 2019 / Accepted: 12 June 2019 / Published: 16 June 2019
Particles in transformer oil are harmful to the operation of transformers, which can lead to the occurrence of partial discharge and even breakdown. More and more researchers are becoming interested in investigating the effects of particles on the performance of insulation oil. In this paper, a simulation method is provided to explore the motion mechanism and accumulation characteristics of different particles. This is utilized to explain the effects of particle properties on the breakdown strength of mineral oil. Experiments on particle accumulation under DC voltage as well as DC breakdown were carried out. The simulation results are in agreement with the experimental results. Having a DC electrical field with a sufficient accumulation time and initial concentration are advantageous for particle accumulation. Properties of impurities determine the bridge shape, conductivity characteristics, and variation law of DC breakdown voltages. Metal particles and mixed particles play more significant roles in the increase of current and electrical field distortion. It is noteworthy that cellulose particles along with metal particles cannot have superposition influences on changing conductivity characteristics and the electrical field distortion of mineral oil. The range of electrical field distortion is enlarged as the particle concentration increases. Changes in the electrical field distribution and an increase in conductivity collectively affect the DC breakdown strength of mineral oil. View Full-Text
Keywords: mineral oil; different particles; accumulation behavior; breakdown voltage; DC voltage mineral oil; different particles; accumulation behavior; breakdown voltage; DC voltage
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MDPI and ACS Style

Dan, M.; Hao, J.; Liao, R.; Cheng, L.; Zhang, J.; Li, F. Accumulation Behaviors of Different Particles and Effects on the Breakdown Properties of Mineral Oil under DC Voltage. Energies 2019, 12, 2301.

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