کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
704381 | 1460875 | 2016 | 7 صفحه PDF | دانلود رایگان |
• This paper investigates DC biasing impacts on power transformers.
• A new dual circuit model is presented for the off-core flux path including the tank walls.
• Parameters of the off-core model are calculated using 3D-FEM.
• The tank walls are modeled by two equivalent circuits based on finite difference and surface impedance methods.
Modeling of 3-legged, 3-phase transformers under DC biasing is a challenging topic due to the need to an adequate representation of flux paths beyond the active part including the tank. The main contribution of this paper is to present a new dual circuit model which takes the off-core flux path into consideration. Tank elements including the walls, bottom and cover are considered with a detailed as well as a steady state equivalent circuit. Having a new model, the behavior of a test transformer is studied under DC excitation in terms of magnitude and harmonic content of exciting current as well as reactive and active power flowing through the transformer.
Journal: Electric Power Systems Research - Volume 138, September 2016, Pages 18–24