A model for life time evaluation of closed electrical contacts

Braunović, M.; Izmailov, V. V.; Новоселова, М. В.

doi:10.1109/holm.2005.1518247

Cited by 11 publications

(21 citation statements)

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“…Another future task is to understand how the parameters determined by the regression change with time. Both Braunovic et al (2005) and Korendo and Florkowski (2001) have provided methods to analyse time series of the contact resistance. The current measurement period may be too short in order to observe changes in one disconnector.…”

Section: Discussionmentioning

confidence: 99%

“…It has been shown that the correlation between the temperature rise and the resistance is around 0.9 (Braunovic et al, 2009), so any of these parameters can be utilised. Braunovic et al (2005) have deduced formulas that express how the contact resistance increases with time due to oxidation. The formulas predict sometimes a sharp increase of the resistances a function of time, sometimes just a linear growth, depending on the distribution of contact spots between the two conductors.…”

Section: Introductionmentioning

confidence: 99%

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Condition monitoring of disconnectors in the electric power transmission grid with temperature sensors

Westerlund

Hilber

Lindquist³

2016

IJISE

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This paper presents a method that can be used to rank disconnectors in the electric power system, according to the condition of one of the most critical parts, the contacts. The temperature of the contacts can be continuously measured by a new type of infrared sensor. For the case study, 54 sensors were placed on six disconnectors together with reference sensors measuring the ambient temperature. The measured temperature at each contact is then regressed against the ambient temperature and the current through the disconnector. Both a linear and a quadratic dependency of the current are tested and the quadratic one explains the data best. The coefficient of the current serves as a measure of the condition of the contact. Then, it becomes possible to identify in which contacts the resistance has increased the most. As a consequence, it is possible to make better maintenance decisions for the disconnectors.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Condition monitoring of disconnectors in the electric power transmission grid with temperature sensors

Westerlund

Hilber

Lindquist³

2016

IJISE

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“…Details about the statistical model are shown by Izmailov et al [39]. A more detailed physical study of life time of closed electrical contacts is [40], which shows that the life time follows the expressions given by the theory, which has been developed by Holm [41].…”

Section: A Current Carryingmentioning

confidence: 95%

A review of methods for condition monitoring, surveys and statistical analyses of disconnectors and circuit breakers

Westerlund

Hilber

Lindquist

et al. 2014

2014 International Conference on Probabilistic Methods Applied to Power Systems (PMAPS)

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Abstract-There is a need for a new survey of conditionmonitoring methods for circuit breakers and disconnectors, since during the last two decades less than ten surveys have been carried out. The paper presents several statistical surveys and analyses. The methods of condition monitoring found are reviewed and classified according to the different types of failure identified in the surveys. Some research gaps are identified, such as the prediction of the degradation of the contacts, the signal processing of coil and motor currents and the switching.

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“…The forecasting of the residual lifetime of electrical contacts based on the electrical resistance as a key parameter is described in [2]. In the present paper, the use of temperature for estimating the residual lifetime of power connections is described.…”

Section: Selection Of Key Parametersmentioning

confidence: 99%

Estimation of Remaining Lifetime of Power Connections Using Infrared Thermography

Braunović

Izmailov

Naumov

et al. 2009

2009 Proceedings of the 55th IEEE Holm Conference on Electrical Contacts

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A model for life time evaluation of closed electrical contacts

Cited by 11 publications

References 11 publications

Condition monitoring of disconnectors in the electric power transmission grid with temperature sensors

Condition monitoring of disconnectors in the electric power transmission grid with temperature sensors

A review of methods for condition monitoring, surveys and statistical analyses of disconnectors and circuit breakers

Estimation of Remaining Lifetime of Power Connections Using Infrared Thermography

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