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Measurements and modelling of three- and five-limb transformer behaviour during large voltage and frequency disturbances

Mattias Persson (Institutionen för energi och miljö, Elteknik) ; Waqas Baig ; Torbjörn Thiringer (Institutionen för energi och miljö, Elteknik)
IET Generation, Transmission & Distribution (1751-8687). Vol. 10 (2016), 2, p. 334-340.
[Artikel, refereegranskad vetenskaplig]

This study presents the modelling of transformers for voltage disturbances. The focus in this study is on the security of the power supply for sensitive loads, for instance, the auxiliary systems for a nuclear power station feeding, for instance, pumps for emergency systems. Both steady-state operation as well as transient conditions have been analysed. A five-limb as well as a three-limb 4 kVA transformer was designed in order to verify theoretical assumptions with experimental results. The results show that the theoretical models provided results in conformity to the actual experiments with an average discrepancy of 3%. Moreover, it is shown that a five-limb transformer gives lower inrush currents, especially in the highly saturated region. In addition, it was demonstrated that an inductive load gives much higher inrush currents compared with a resistive load. A final observation was that the current drawn by the two transformers in their saturated state differ severely depending on the topology of the core.

Nyckelord: large voltage disturbance; inrush currents; three-limb transformer; frequency disturbance; power supply security; apparent power 4 kVA; sensitive loads; auxiliary systems; steady state operation; transient conditions; five-limb transformer; inductive load

Denna post skapades 2015-11-05. Senast ändrad 2017-10-03.
CPL Pubid: 225282


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Institutioner (Chalmers)

Institutionen för energi och miljö, Elteknik (2005-2017)


Elektroteknik och elektronik

Chalmers infrastruktur