Next Article in Journal
Model Predictive Control of a Wave Energy Converter with Discrete Fluid Power Power Take-Off System
Next Article in Special Issue
Characteristics of Negative Streamer Development in Ester Liquids and Mineral Oil in a Point-To-Sphere Electrode System with a Pressboard Barrier
Previous Article in Journal
A Novel Statistical Method to Temporally Downscale Wind Speed Weibull Distribution Using Scaling Property
Previous Article in Special Issue
Electronic Properties of Typical Molecules and the Discharge Mechanism of Vegetable and Mineral Insulating Oils
Article Menu
Issue 3 (March) cover image

Export Article

Open AccessArticle
Energies 2018, 11(3), 634; https://doi.org/10.3390/en11030634

Experimental Study on Breakdown Characteristics of Transformer Oil Influenced by Bubbles

1
School of Electrical Engineering, Northeast Electric Power University, No. 169 Changchun Road, Jilin 132012, China
2
Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, No. 619 North of Yonghua Street, Baoding 071003, China
*
Author to whom correspondence should be addressed.
Received: 30 January 2018 / Revised: 7 March 2018 / Accepted: 9 March 2018 / Published: 13 March 2018
(This article belongs to the Special Issue Engineering Dielectric Liquid Applications)
Full-Text   |   PDF [1413 KB, uploaded 13 March 2018]   |  

Abstract

Bubbles will reduce the electric strength of transformer oil, and even result in the breakdown of the insulation. This paper has studied the breakdown voltages of transformer oil and oil-impregnated pressboard under alternating current (AC) and direct current (DC) voltages. In this paper, three types of electrodes were applied: cylinder-plan electrodes, sphere-plan electrodes, and cone-plan electrodes, and the breakdown voltages were measured in both no bubbles and bubbles. The sphere-sphere electrodes were used to study the breakdown voltage of the oil-impregnated pressboard. The results showed that under the influence of bubble, the breakdown voltage of the cylinder-plan electrode dropped the most, and the breakdown voltage of the cone-plan electrode dropped the least. The bubbles motion was the key factor of the breakdown. The discharge types of the oil-impregnated pressboard were different with bubbles, and under DC, the main discharge type was flashover along the oil-impregnated pressboard, while under AC, the main discharge type was breakdown through the oil-impregnated pressboard. View Full-Text
Keywords: breakdown voltage; transformer oil; pressboard; bubbles; AC; DC breakdown voltage; transformer oil; pressboard; bubbles; AC; DC
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Qin, C.; He, Y.; Shi, B.; Zhao, T.; Lv, F.; Cheng, X. Experimental Study on Breakdown Characteristics of Transformer Oil Influenced by Bubbles. Energies 2018, 11, 634.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top