scholarly journals The Comparison Characteristics of Investigation Breakdown Voltage of Long Flash over Arrestor (LFA) with Different Gaps Space by Using Positive and Negative Impulse Voltage

2016 ◽  
Vol 86 ◽  
pp. 329-332
Author(s):  
Vilasay Solaphom ◽  
Kittipong Tonmitr ◽  
Norrawit Tonmitr ◽  
Eiji Kaneko
Keyword(s):  
Breakdown Voltage ◽  
Impulse Voltage ◽  
Negative Impulse

THE ELECTRICAL BREAKDOWN OF SMALL GAPS IN VACUUM

1958 ◽  
Vol 36 (4) ◽  
pp. 476-493 ◽  
Author(s):  
A. S. Denholm
Keyword(s):  
Time Dependence ◽  
Breakdown Voltage ◽  
Discharge Current ◽  
Electrical Breakdown ◽  
Vacuum Discharge ◽  
Diffusion Pump ◽  
Hydrogen Discharge ◽  
Impulse Voltage ◽  
Vacuum Gap ◽  
Plateau Level

An investigation of the electrical breakdown in vacuum of small gaps subject to contamination by diffusion pump oil showed that the most consistent results were obtained when electrodes were conditioned by a hydrogen discharge. Even with this method of conditioning a few preliminary sparks were usually required before the breakdown voltage reached a plateau level, so that the vacuum discharge itself could affect the final values obtained. The circuit parameters which controlled the discharge current were found to influence the magnitude and consistency of the breakdown voltage appreciably.Direct, alternating, and impulse voltage tests showed that the time for which voltage was applied to the vacuum gap influenced the breakdown voltage, and curves are presented which give the insulation strength of the gap. Two possible explanations of the time dependence of the breakdown voltage are given.

Flashover mechanism on the surface of dielectric plate in the atmosphere under negative impulse voltage

1985 ◽  
Vol 105 (4) ◽  
pp. 24-32
Author(s):  
Toshiyuki Shimazaki ◽  
Itaru Tsuneyasu ◽  
Masanori Akazaki
Keyword(s):  
Dielectric Plate ◽  
Impulse Voltage ◽  
Negative Impulse

Double short vacuum gaps in series under lightning impulse voltage: Estimation of breakdown voltage

2020 ◽  
Vol 27 (4) ◽  
pp. 1297-1304
Author(s):  
Jingyu Shen ◽  
Hui Ma ◽  
Xiangteng Ma ◽  
Zhiyuan Liu ◽  
Yingsan Geng ◽  
...  
Keyword(s):  
Breakdown Voltage ◽  
Impulse Voltage ◽  
Lightning Impulse ◽  
In Series ◽  
Vacuum 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.

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