Measurements and modelling of three- and five-limb transformer behaviour during large voltage and frequency disturbances
Artikel i vetenskaplig tidskrift, 2016

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.

large voltage disturbance

three-limb transformer

inrush currents

transient conditions

sensitive loads

auxiliary systems

apparent power 4 kVA

frequency disturbance

inductive load

power supply security

five-limb transformer

steady state operation


Mattias Persson

Chalmers, Energi och miljö, Elkraftteknik

Waqas Baig

Chalmers University of Technology

Torbjörn Thiringer

Chalmers, Energi och miljö, Elkraftteknik

IET Generation, Transmission and Distribution

1751-8687 (ISSN) 1751-8695 (eISSN)

Vol. 10 334-340


Elektroteknik och elektronik

Annan elektroteknik och elektronik