Improved Model of Thermal Rotor Protection Including Negative Sequence Protection

Davorin Burgund and Srete Nikolovski
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Davorin Burgund: Elektrogen d.o.o., 10000 Zagreb, Croatia
Srete Nikolovski: Power Engineering Department, Faculty of Electrical Engineering, Computer Science and Information Technology, University of Osijek, 31000 Osijek, Croatia

Energies, 2022, vol. 15, issue 7, 1-15

Abstract: The paper presents a new model of the thermal rotor protection 49R on synchronous generators with self-excitation with the influence of generator negative sequence protection 46I2. The purpose of the analysis is to solve the problem of simultaneous occurrence of rotor overload due to excitation current and rotor overload due to the inverse component of the stator current. The numerical protections are designed to operate independently of each other, and therefore the residual thermal capacity of the copper windings is not defined with higher precision. A mathematical model that integrates these two protections is given and described.

Keywords: rotor thermal protection; negative sequence protection; synchronous generator; excitation system; air-cooled generator; rotor temperature (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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