Justification of parametric temperature regime in transformer protective structures

Palchykov Roman

Institute for Scientific Research on Civil Protection

of the National University of Civil Protection of Ukraine

https://orcid.org/0009-0004-7959-571X

DOI: https://doi.org/10.52363/2524-0226-2025-42-5

Keywords: fire resistance, fire resistance limit, fire resistance class, temperature regime, transformer, critical infrastructure

Аnnotation

The research results demonstrate that under conditions of Russian aggression, the implementation of modern approaches to limiting the spread of fire on transformer equipment is one of the priority tasks of protecting the country’s economy and national security. A calculation scenario for studying the temperature regime during a fire on a transformer located in a protective structure was selected, and was conducted using two scenarios for the occurrence and spread of fire. Calculation models were built for the study. The results of the theoretical study demonstrate temperature changes in the protective structure during transformer burning according to data from a temperature sensor installed at heights of 1 m, 10 m and 18 m above the place of combustion. when the protective structure does not have an automatic fire extinguishing system and in the case when the protective structure has an automatic fire extinguishing system. The results obtained showed that with the presence of an automatic fire extinguishing system in the protective structure, a certain decrease in temperature is observed after the two hundredth second of the study, which is explained by the cooling of the building structures of the protective struc-ture by water flows, To substantiate the temperature regime during a transformer fire, the conditions of the greatest impact of temperature on building structures were assumed. Statistical processing of the research results was carried out. The results of a study on the justification of a modified temperature regime during a fire on transformers located inside protective structures are presented. which is advisable to use in the future to assess the fire resistance class of building structures of such protective structures and establish a standardized time during which building structures of protective structures must withstand the effects of a modified temperature regime. Suggestions are provided for further research in this direction.

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