Alternating streamer propagation in mineral oil under bipolar oscillating impulse voltage

2018 ◽  
Vol 25 (7) ◽  
pp. 072125 ◽  
Author(s):  
Heli Ni ◽  
Qiaogen Zhang ◽  
Zhicheng Wu ◽  
Xing Fan ◽  
Xuandong Liu
Keyword(s):  
Mineral Oil ◽  
Impulse Voltage ◽  
Streamer Propagation

scholarly journals Streamer propagation in a non-uniform electric field under lightning impulse in short gaps insulated with natural ester and mineral oil

2016 ◽  
Vol 64 (1) ◽  
pp. 171-179 ◽  
Author(s):  
P. Rozga
Keyword(s):  
Light Emission ◽  
Experimental Studies ◽  
Mineral Oil ◽  
Uniform Electric Field ◽  
Light Pulses ◽  
Streamer Propagation ◽  
Lightning Impulse ◽  
Small Electrode ◽  
Acceleration Voltage ◽  
Natural Ester

Abstract This article describes the comparative experimental studies on streamer propagation in natural ester and mineral oil under a high voltage lightning impulse. These studies were concentrated around the small electrode gaps and the point-plane electrode arrangement. The spatial shapes of the developing streamers, light emission and propagation velocity were analyzed and compared between the two different dielectric liquids. In both of them two streamer propagation modes were registered during the studies performed. Propagation of slow 2nd mode streamers took place below the so-called acceleration voltage while fast 3rd mode streamers developed at acceleration voltage and above. Comparing the streamer shapes corresponding to a given voltage polarity, no visible differences were observed between the liquids tested. Concerning the light emission, higher frequencies of light pulses were registered however in the case of natural ester. The significant differences between both liquids were noticed in the value of the acceleration voltage estimated. In the case of positive polarity streamers started to develop in natural ester as a 3rd mode at lower value of testing voltage than in the case of mineral oil. For negative polarity, within the applied testing voltages, 3rd mode streamers appeared only in natural ester. On this basis, the fundamental conclusion is that natural ester may have a lower ability of preventing the development of fast and energetic 3rd mode streamers, even at small electrode gaps.

scholarly journals Behavior of Biodegradable Oil under Impulse Voltages

2015 ◽  
Vol 785 ◽  
pp. 320-324 ◽  
Author(s):  
Nurul Izzatul Akma Katim ◽  
Mohd Taufiq Ishak ◽  
A.M. Ishak ◽  
M.Z.A.A. Kadir
Keyword(s):  
Breakdown Voltage ◽  
Palm Oil ◽  
Coconut Oil ◽  
Mineral Oil ◽  
Electrical Performance ◽  
Uniform Field ◽  
Testing Methods ◽  
Environmental Compatibility ◽  
Impulse Voltage ◽  
Lightning Impulse

The properties of Palm Oil (PO) and Coconut Oil (CO) offer the potential for transformers with non-toxicity, high fire and flash points and better environmental compatibility while compared with those filled with Mineral Oil (MO). This potential has led to intensive studies of electrical performance of biodegradable oil especially in evaluating the electrical performance under lightning impulse voltage in recent years. This paper presents the investigation on the impulse breakdown voltage of PO and CO in such a uniform field. The PO used in this study is Refined, Bleached and Deodorized Palm Oil (RBDPO) Olein type. Two testing methods, rising-voltage and up-and-down are considered for both oils with different gap distances (2.0 mm and 3.8 mm). Testing methods including rising-voltage method and up-and-down method have no notable influence on the breakdown voltages of RBDPOs and CO compared to MO.

Cellulose Particle Dynamics Tests and Simulation in Mineral Oil under Impulse Voltage

2021 ◽  
Author(s):  
Bo Gao ◽  
Qingping Zhang ◽  
Hairong Luo ◽  
Xuefeng Li ◽  
Yongliang Li
Keyword(s):  
Mineral Oil ◽  
Particle Dynamics ◽  
Impulse Voltage
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