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EVALUATION OF DIFFERENT TYPES OF STEEL UNDER HIGH LOADING RATES FOR SHORT CIRCUIT APPLICATIONS

Emanuel Almeida ; EFACEC Power Transformers
Pedro Pedro ; EFACEC Power Transformers
Paulo Martins ; Instituto Superior Técnico
Carlos Silva ; Instituto Superior Técnico

Sažetak

This paper draws from independent experimental results pertaining to the properties of steel
loaded at high strain rates, similar to those found in power transformer short-circuits. The types of steel
that were tested are common non-alloy structural steel and high strength structural steel. The
experiments showed that the most common types of structural steel, when loaded at high rates, are
capable of absorbing considerably more energy than in quasi-static conditions. On the other hand, the
high strength structural types of steel that were tested showed no improvement in their energy absorbing
characteristics at high strain rates. The paper provides some examples to show how the experimental
results may be incorporated in the design of steel components for short circuit safety. The last part is
focused on the plastic deformation of steel and assesses its influence on the impedance variation of the
power transformer following a short circuit.

Ključne riječi

Shell form transformers; short-circuit; dynamic analysis; material high loading rate

Hrčak ID:

199215

URI

https://hrcak.srce.hr/199215

Datum izdavanja:

15.8.2017.

Posjeta: 498 *