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\title{Behaviour of short-circuit current components of a large hydro power
plant with special consideration of switching and fault arcs}



\author[1]{Darko Brankovic}%
\author[1]{Robert Schuerhuber}%
\affil[1]{Graz University of Technology}%


\vspace{-1em}



  
  \date{April 25, 2026}


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\begin{abstract}
The correct design of the generator circuit breaker (GCB) is essential
for the safe and reliable operation of a power plant or generation
system. The design is usually based on standardized calculation methods
according to standards (IEC standard 60909-0, IEC/IEEE standard
62271-37-013), often supplemented by selected transient calculations. A
non-systematic approach can often be observed here, which does not
adequately take into account significant influencing variables or
operating states of the generator. This article therefore systematically
examines various parameters that influence the short-circuit current
components of the generator and are relevant for the design of the
generator circuit-breaker: Short-circuit angle, operating point, phase
clearing, switching arc, and fault arc. The results of the current
parameters most relevant to the dimensioning of the GCB were then
compared for different calculation methods. Particular attention was
paid to the influence of the switching arc and fault arc, which is
modeled in a transient calculation, and its effect on the short-circuit
currents is systematically recorded. This work aims to summarize all
relevant variables that influence the generator short-circuit current
and are relevant for the dimensioning of the GCB and to present the
different results based on a short-circuit calculation according to the
standard and transient calculation to create a basis for a proper
dimensioning of the generator circuit breaker.%
\end{abstract}%



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