Transformer insulation on the threshold of new era

Mentlík, Václav; Trnka, Pavel; Pihera, Josef

doi:10.1109/eic.2009.5166330

Cited by 3 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A special case is when β = 1, where Weibull distribution is equivalent to the exponential distribution (1) and instantaneous failure rate becomes constant. These limit values of the parameter β values are characteristic for the construction of the bathtub curve [1], [2].…”

Section: Weibull Distributionmentioning

confidence: 98%

“…The failure rate of electrical insulation materials is usually given by an exponential distribution. The probability density function of exponential distribution denotes [3]:…”

Section: Accelerated Laboratory Agingmentioning

confidence: 99%

“…For numeric expression is used the probability of a fault condition, defined as the area under the curve of probability density function and the probability that at investigated object occurs in time t fault, see (9) [3].…”

Section: Weibull Distributionmentioning

confidence: 99%

“…For proper design and dimensioning, the key characteristic is the material endurance for particular stress level. This information should be obtained for example by accelerated laboratory testing [1].…”

Section: Introductionmentioning

confidence: 99%

“…Completely different is the probabilistic approach. The most commonly used is the Weibull distribution, which allows a very close approximation of the measured data [1].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Statistical approach to endurance models - data processing using regression models

Trnka

Soucek

Hornak

et al. 2015

2015 16th International Scientific Conference on Electric Power Engineering (EPE)

Self Cite

View full text Add to dashboard Cite

The paper presents a methodology for processing experimental data related to the issue of the electrical insulation system endurance, using the method of accelerated laboratory aging. Several possible approaches are proposed. Traditionally used is the phenomenological approach combined with mathematical regression of measured data. This method is complemented by confidence intervals to ensure statistical certainty of the results of the experiment statements.The paper also describes a statistical approach to endurance modeling, however similarly supplemented with statistical certainty by using confidence intervals. Statistical certainty based on confidence intervals brings very valuable information for the practical use of electrical insulation materials and systems, especially considering design and dimensioning.

show abstract

Section: Weibull Distributionmentioning

confidence: 98%

“…The failure rate of electrical insulation materials is usually given by an exponential distribution. The probability density function of exponential distribution denotes [3]:…”

Section: Accelerated Laboratory Agingmentioning

confidence: 99%

Section: Weibull Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Completely different is the probabilistic approach. The most commonly used is the Weibull distribution, which allows a very close approximation of the measured data [1].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Statistical approach to endurance models - data processing using regression models

Trnka

Soucek

Hornak

et al. 2015

2015 16th International Scientific Conference on Electric Power Engineering (EPE)

Self Cite

View full text Add to dashboard Cite

show abstract

Electroinsulating fluids — New insulating mixtures

Trnka

Mentlík

Černý

2011

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

View full text Add to dashboard Cite

Cole-cole diagram as diagnostic tool for dielectric liquids

Sirucek

Mentlík

Trnka

et al. 2011

2011 IEEE International Conference on Dielectric Liquids

View full text Add to dashboard Cite

Dielectric subsystems have an important influence on reliability, lifetime and power of electrical equipments. Study of dielectric parameters and their changes due to degradation mechanisms provide important information about the equipments. Paper deals with oil-paper systems and their thermal degradation. These systems are used for example in transformer, capacitors and bushings. Thermal degradation causes increasing of moisture content thus number of polar particles. Therefore the main idea of this paper is diagnostic of oil-paper insulation based on a method of polarization measurement. One of the methods is Cole-Cole diagram [I] or its modification e.g. Davidson [5], Havriliak-Negami [11]. The next aim of the paper is measurement of the system parameters (Complex permittivity, Viscosity, Acid value, Resistivity, Polarization index and Dissipation factor) and their changes due to thermal degradation. In experiments are used a normal and an environmental friendly fluid.

show abstract

Transformer insulation on the threshold of new era

Cited by 3 publications

References 6 publications

Statistical approach to endurance models - data processing using regression models

Statistical approach to endurance models - data processing using regression models

Electroinsulating fluids — New insulating mixtures

Cole-cole diagram as diagnostic tool for dielectric liquids

Contact Info

Product

Resources

About

Transformer insulation on the threshold of new era

Cited by 3 publications

References 6 publications

Statistical approach to endurance models - data processing using regression models

Statistical approach to endurance models - data processing using regression models

Electroinsulating fluids &#x2014; New insulating mixtures

Cole-cole diagram as diagnostic tool for dielectric liquids

Contact Info

Product

Resources

About

Electroinsulating fluids — New insulating mixtures