Study of the acceptable DC current limit in core-form power transformers

Autor:	L. Bolduc, V. Q. Pham, A. Dutil, P. Picher
Rok vydání:	1997
Předmět:	Engineering business.industry Nuclear engineering Direct current Electrical engineering Energy Engineering and Power Technology Temperature measurement law.invention Dc current Dc source law Autotransformer Electrical and Electronic Engineering business Transformer Excitation
Zdroj:	IEEE Transactions on Power Delivery. 12:257-265
ISSN:	0885-8977
DOI:	10.1109/61.568248
Popis:	The temperature rise in power transformers subjected to a DC source of excitation was measured on core-form single-phase 735 kV autotransformers rated 370 MVA and 550 MVA. The measurements were compared to the temperature rise values obtained on the same transformers operating in overexcitation at 1.95 T. The results show that the tie plates of this particular type of transformer are the components most susceptible to rapid temperature rise. Smaller-scale tests on 100 kVA transformers were performed to take a specific look at these tie plates under the effect of a temperature increase. Finite-element simulations combined with analytical studies of temperature rise were performed in an attempt to determine a tolerable DC current limit based on permissible temperature standards.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cfc61914bb9befcf8e5ce72fbb3866ca https://doi.org/10.1109/61.568248 Zobrazit plný text záznamu