Naslov
Evaluation of Transmitted Over-Voltages through a Power Transformer Taking into Account Uncertainties on Lightning Parameters

Autori
Jurišić, Bruno ; Xemard, Alain ; Uglešić, Ivo ; Paladian, Francoise ; Lallechere, Sebastien, Bonnet, Pierre

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
33rd International Conference on Lightning Protection / - Estoril, 2016, 1-7

Skup
33rd International Conference on Lightning Protection

Mjesto i datum
Estoril, Portugal, 25.09.2016. - 30.09.2016

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Transformer ; Black Box Model ; Monte Carlo Method ; Stochastic Collocation Method ; Uncertainty Quantification ; Electromagnetic Transient Program (EMTP)

Sažetak
Lighting striking an overhead line is at the origin of high frequency over-voltages, which propagate along the line and through the power transformers located at its ends. To study the transmission of over-voltages through transformers, low frequency transformer models are not adapted. Therefore, in the past few decades, many high frequency transformer models were developed. Recently, in the CIGRE brochure 577, an overview of such models is given. In this paper the over-voltages caused by lightning strikes to a 20 kV overhead line are simulated to calculate the amplitudes of over- voltages in a 6.8 kV distribution grid, transmitted through a Yd11d11, 64 MVA, 24/6.8/6.8 kV transformer unit. A high frequency black box transformer model is used. This model is based on frequency response measurements, rational approximation and state space equations. Uncertainties on lightning parameters are taken into account by using the Monte Carlo and Stochastic Collocation methods. The aim of the paper is to present a methodology to evaluate the statistical variations of transmitted over-voltages.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

POVEZANOST RADA