Next Article in Journal
Transformer Paper Expected Life Estimation Using ANFIS Based on Oil Characteristics and Dissolved Gases (Case Study: Indonesian Transformers)
Next Article in Special Issue
Insulation Strength and Decomposition Characteristics of a C6F12O and N2 Gas Mixture
Previous Article in Journal
An Energy Efficient Lighting Design Strategy to Enhance Visual Comfort in Offices with Windows
Previous Article in Special Issue
Using SF6 Decomposed Component Analysis for the Diagnosis of Partial Discharge Severity Initiated by Free Metal Particle Defect
Article Menu
Issue 8 (August) cover image

Export Article

Open AccessArticle
Energies 2017, 10(8), 1120; doi:10.3390/en10081120

Proposal of Physical-Statistical Model of Thermal Aging Respecting Threshold Value

ALFMEIER CZ s.r.o., 301 00 Pilsen, Czech Republic
Department of Technologies and Measurement, Faculty of Electrical Engineering, University of West Bohemia, 306 14 Pilsen, Czech Republic
Author to whom correspondence should be addressed.
Received: 26 June 2017 / Revised: 21 July 2017 / Accepted: 24 July 2017 / Published: 2 August 2017
View Full-Text   |   Download PDF [4634 KB, uploaded 2 August 2017]   |  


The aging of electrical insulation material or a system is a main issue for designers of high-voltage (HV) machines. Precise determination of the life cycle of electrical insulation is one way of improving the efficiency of electrical machines involved in the production and transmission of electrical energy. Much effort has been devoted to preparing statistical or physical methods of Electrical Insulating System (EIS) life time estimation in the real operation of electrical machinery. The main aim of this paper is to introduce a new physical-statistical model of thermal aging respecting the threshold value. This model is based on thermal aging model and the main difference between this model and previously published models is taking into account the threshold value of degradation factor. The complete design of this model is presented in this paper, including functions defining the threshold value of the effect of the degradation factor depending on the temperature. Proposed model was verified by accelerated thermal aging test at selected temperatures (160, 170, 180 °C) and time intervals (0, 120, 240 h) on a commonly used transformer board. The breakdown voltage was set as an indicating parameter of the level of thermal aging and was measured according to standard IEC 60243-1. Collected data from these measurements were used for threshold value determination (431.23 K) and verification of proposed physical-statistical model of thermal aging respecting the threshold value. View Full-Text
Keywords: aging model; insulation; Weibull distribution; threshold value aging model; insulation; Weibull distribution; threshold value

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 alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Souček, J.; Trnka, P.; Hornak, J. Proposal of Physical-Statistical Model of Thermal Aging Respecting Threshold Value. Energies 2017, 10, 1120.

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



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