Title :
How to Avoid Unstable Time Domain Responses Caused by Transformer Models
Author_Institution :
SINTEF, Norway
fDate :
3/1/2002 12:00:00 AM
Abstract :
Modeling a three-winding transformer occasionally gives a negative reactance that may result in an unstable circuit. This unstable condition can be eliminated by neglecting the magnetizing losses or taking them into account in a different way, as shown in this paper. Unstable responses are under certain conditions extremely dependent on the time step when using EMTP or similar programs. This paper shows why simulated terminal voltages do not always reveal an unstable circuit condition.
Keywords :
Circuits; EMTP; Impedance; Inductance; Iron; Oil insulation; Power quality; Power transformers; Transformer cores; Transmission line matrix methods; Transformers; modeling; negative inductance; time domain analysis; unstable circuit;
Journal_Title :
Power Engineering Review, IEEE
DOI :
10.1109/MPER.2002.4312080