ADAPTIVE GROUND FAULT PROTECTION FOR A DISTRBUTION NETWORK
Date
1994-08
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Degree Level
Masters
Abstract
Due to advances in the field of digital protection, more and more utilities are using
microprocessor based relays for protection of power system equipment However, the
protection philosophy remains the same. The present practice of protection is to analyze all the abnormal operating conditions in advance and to set the relays considering all the Contingencies. But it is not possible to identify all operating conditions in advance and to determine a set of relay settings that are optimum for all those conditions. Compromises are, therefore, made which result in the relays exhibiting poor selectivity, slow response and even failure to operate.
Many researchers are now investigating the capability of microprocessor based
relays to adapt to the changing state of the power system. This approach, known as
adaptive protection, will allow the relay settings to be changed dynamically to suit the
prevailing operating condition of the power system.
The work reported in this thesis includes the investigations for setting ground
overcurrent relays in a distribution system and changing the settings to adapt to the
operating conditions of the system. Four software modules were developed for this
purpose and were tested using a personal computer.
The results reported in the thesis demonstrate that improvements in coordination of
ground overcurrent relays can be achieved when the adaptive approach of protection is implemented.
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Degree
Master of Science (M.Sc.)
Department
Electrical and Computer Engineering
Program
Electrical Engineering