الفهرس 
Busbar ProtectionOnly 14 pages are availabe for public view
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Abstract
This thesis introduces a new technique for busbar
differential protection. The new method overcomes the current
transformers saturation problem which is considered the main
problem facing busbar differential protection.
The harmonic contents of the saturation current are studied to
extract the main harmonic features of the saturated current.
Based on this harmonic study, the new technique is developed.
As a novel technique for busbar protection, the harmonic
contents of the saturated current are used in both detecting and
compensating the saturation of the current transformers.
The secondary saturated current of current transformers IS
analyzed. Depending on this harmonic analysis, an empirical
formula for compensating the secondary current of the CT
is proposed. Using the proposed technique, corrected values for
the CT currents are calculated instead of the reduced values
caused by saturation. The corrected values are introduced in the
protection algorithm which minimizes -to a great extend false
operation of busbar protection.
Different case studies using the new numerical simulation are
studied. An experimental work is set up for this purpose. The
proposed technique is applied on the differential busbar protection and the results conclude that the new algorithm
proves stablility during CT saturation, which eliminates the
mal operation of the relay.