SUBSTATION SWITCHING
Date
1995
Authors
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Publisher
ORCID
Type
Degree Level
Masters
Abstract
A power system network requires frequent changes in its configuration during normal operation. These changes are made by operating circuit breakers and isolators located in substations. In the past, switches were opened and closed by the operators using predefined guidelines. This task is performed in modern substations by digital computers either exclusively or in the form of assisting the operators in making proper decisions. The quality of power supplied to customers is enhanced if the computers automatically make appropriate switching decisions without significant delay.
This thesis describes the design of a digital computer based substation switching scheme which employs generalized rules for interlocking and sequence switching. In addition to interlocking constraints, generatoion and load balance, ratings of equipment, and continuity of power supply are taken into consideration.
When started for the first time, the program processes the data concerning the electrical layout of the substation and makes various lists and tables which are frequently used for making switching decisions. When changes in the configuration of a substation are requested, the program automatically determines alternative switching sequences and selects and implements the most economical sequence. It also assists the operator in the evaluation of abnormal circumstances. The program was tested by using five configurations of substations. It has been demonstrated that the program is suitable for implementing interlocking schemes and determining and implementing switching operations.
Description
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Citation
Degree
Master of Science (M.Sc.)
Department
Electrical Engineering