Discharge Characteristics and Numerical Simulation of the Oil–Gas Surface under DC Voltage

Low insulation strength at the oil–gas surface due to oil leakage and partial discharge of oil-immersed power equipment is a major threat to the safe and reliable operation of power systems. This paper investigates the initiation and development of the oil–gas surface discharge. The oil–gas surface...

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Bibliographic Details
Published in:Energies (Basel) 2023-04, Vol.16 (8), p.3558
Main Authors: Zhou, Yuanxiang, Yang, Xiaojing, Li, Yuhang, Jiang, Guiming, Chen, Jianning
Format: Article
Language:English
Subjects:
Analysis
Dielectric barrier discharge
Electric fields
Electric potential
Electric power systems
Electrodes
Flow velocity
Insulation
Liquid surfaces
Mathematical models
Morphology
Multilayers
Numerical analysis
numerical simulation
Oil
Oil spills
oil–gas surface
Petroleum mining
Power supply
Reynolds number
Simulation
Simulation analysis
Simulation methods
streamer discharge
surface discharge
Voltage
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Summary:Low insulation strength at the oil–gas surface due to oil leakage and partial discharge of oil-immersed power equipment is a major threat to the safe and reliable operation of power systems. This paper investigates the initiation and development of the oil–gas surface discharge. The oil–gas surface discharge test platform was established, and discharge tests were carried out at different gap distances (1–2.5 mm). By coupling the electric field and flow field, the multi-layer dielectric discharge streamer model was built, and the characteristics of charge and electric field distribution at different gap distances were studied. The test results show that the liquid surface between the electrodes rises during the discharge process. Furthermore, the surface discharge voltage exceeds the air gap discharge voltage. With the simulation analysis, the oil–gas surface discharge is a typical streamer development process. Under 50 kV applied voltage and 2.5 mm gap distance, the average development speed of the streamer is 12.5 km/s. The larger the gap distance is, the greater the average streamer development speed is. The recording and numerical simulation of the discharge process are of great significance for exploring the mechanism of oil–gas surface discharge, optimizing the discharge process, and diagnosing partial discharges.
ISSN:1996-1073
1996-1073
DOI:10.3390/en16083558