NDLI: Contribution of free iron particles to PD characteristics in flowing transformer oil at DC voltages

Content Provider	IET Digital Library
Author	Luo, Xinyu Tang, Ju Pan, Cheng Zhang, Yongze
Abstract	Partial discharge (PD) characteristics of the transformer oil contaminated by metallic particles are relevant to particle movement. The motion characteristics of the particles will change when the oil flows, and hence, the PD characteristics differ from that in stationary oil. In this study, the PD characteristics were investigated at direct current voltages, and the particle trajectories were observed simultaneously. It was found that the number of discharges obviously decreased, but the discharge magnitude slightly increased as the oil flow speed increased. To explain the changes in the PD characteristics, a solid-liquid two-phase flow model was established to simulate the trajectories and the electric field distribution around particles. The experimental observations partially verified the simulated trajectories, which includes two stages, namely sedimentation and the subsequent oscillation-collision stage. With the increase of the flow speed, the sedimentation particles decreased, and the horizontal spacing between two adjacent particle-electrode collisions elongated. Therefore, the total collisions became infrequent, which reduced the number of discharges. Moreover, the higher the flow speed was, the slower the particle approached an electrode. Considering the discharge time lag, the distance between the particle and the electrode at the instant of the PD would increase, which increased the discharge magnitude.
Starting Page	294
Ending Page	300
Page Count	7
ISSN	17518687
Volume Number	14
e-ISSN	17518695
Issue Number	Issue 2, Jan (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/14/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2019.1227
Journal	IET Generation, Transmission & Distribution
Publisher Date	2019-11-15
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Adjacent Particle-electrode Collisions DC Voltage Direct Current Voltage Discharge Magnitude Free Iron Particle Iron Metallic Particle Motion Characteristic Oil Flow Speed Organic Insulation Partial Discharge Characteristic Partial Discharges Particle Movement Particle Trajectories PD Characteristic Power Transformer Insulation Sedimentation Particle Solid-liquid Two-phase Flow Transformer And Reactors Transformer Oil Two-phase Flow
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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