NDLI: Optimal Expansion of Transformer Substations

Content Provider	IEEE Xplore Digital Library
Author	Saied, Mohamed Mostafa Fetih, Nabil H. El-Shewy, Hamed M.
Copyright Year	1981
Abstract	Due to the increasing demand for electrical energy, the transmission capacity of existing power transformer substations must be correspondingly increased to prevent their overloading. This paper represents a new method for the optimal expansion for such substations. The optimized objective function includes the total annual cost for the original already existing transformers and the new parallel connected additional transformer. The independent variables for the optimization process are the power rating and the main geometrical dimensions of the new transformer. These variables affect not only the electrical parameters of the new transformer, but also govern the load-sharing between the original and new transformers. Any condition yielding overloading of either of them is to be excluded. The results will strongly depend on the assumed electrical and magnetic loadings. It is shown that for a certain value of the new transformer core flux density, an absolute minimum for the total annual substation cost exists, whereas increasing the current density will result in a monotonous decrease of the cost function. The new method is applied to a practical example, and several checks for its validity are given.
Starting Page	30
Ending Page	30
Page Count	1
File Size	211181
File Format	PDF
ISSN	02721724
Volume Number	PER-2
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1982-11-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Substations Power transformers Cost function Transformer cores Current density Impedance Magnetic flux
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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