الفهرس 
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Abstract
The contradiction between reliability and voltage sag behavior in power systems is thoroughly investigated. Study of the effect of these contradictory features on decision- making -power system reinforcement is the principal point of the present
Reliability study concerns with complete interruption of supply and can be as ”steady-state” phenomenon. On the other hand, voltage sag concerns DROPs and is then considered as ”transient” phenomenon.
The thesis describes a techno-economic method for tackling the interaction between reliability and voltage sag in power system
In general, raising power reliability through line addition to the transmission network the short-circuit level of this network and consequently worsens the voltage sag
Unity of the loads connected to the system bus bars. As line addition is crucial in cases to increase the load ability and to improve the reliability of the power the thesis suggests augmented method which takes both reliability and voltage into consideration. This method can be considered as a guide to the planning
eaaineers in reaching a judicious reinforcing schedule.
An innovative methodology for reliability calculation of the power systems is introduced. Accuracy, simplicity, and less time of execution have been proved through applications and discussion. The thesis suggests using a ”hybrid” cost ftmction which takes into consideration both benefit and loss gained from line Iddition and can help in decision-making. As this function contains variables and Jlll’8Ineters of extremely different nature, the thesis suggests using an adequate expert system in reaching the most appropriate solution.
A case study is presented and solved in details which ascertains accuracy and effectiveness of the proposed methodology.