Type of Document Master's Thesis Author Lorber, Christa Kaye URN etd-06082009-171138 Title Modeling of open bank disturbution transformer connections Degree Master of Science Department Electrical Engineering Advisory Committee
Advisor Name Title Broadwater, Robert P. Committee Chair Liu, Yilu Committee Member Rahman, Saifur Committee Member Keywords
- Software applications - open bank connections
Date of Defense 1995-05-05 Availability restricted Abstract
Distribution transformers are an essential part of any power distribution system. In order to thoroughly simulate and analyze such a system, accurate models must be developed that make use of readily available field data. In addition, unbalanced loading situations, which are encountered frequently in distribution transfonner utilization, must be handled properly. These requirements form the basis for the modeling of the open-wye/open-delta and open-delta/open-delta distribution transformer connections.
The Distribution Engineering Workstation (DEWorkstation), an Electric Power Research Institute (EPRI) software package, is the environment in which the open bank connections are modeled. In particular, a load flow analysis application, called Power Flow, provides the framework for all transformer connection modeling. This framework incorporates a method of tracing through the circuit to determine the voltages and currents on each side of the transfonner connection. From theses parameters, the power rating of each set of paired windings can be determined.
The accuracy of the open bank models developed in DEWorkstation is confirmed through comparison with more rigorous open-wye/open-delta and open-delta/open-delta distribution transformer models. Making use of transformer bank loading results from software developed by Pennsylvania Power and Light (PP&L), the open-wye/open-delta and open-delta/open-delta transformer connections are validated. Other transformer connections that could be verified using the results from PP&L are also presented.
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