Thesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Electrical Power and Machines

Induction motors are being used in more applications than ever before due to their versatility, dependability, ease of control and economy. The wide use of these motors has created a burden on the sub - transmission and distribution network. Some of the known problems are voltage dips, high starting current, and a low lagging power factor especially at light loads. Shunt capacitor banks are generally used to improve their low lagging power factor. Improvement of power factor can reduce power costs, release electrical capacity of the distribution system, raise the voltage level, and reduce the system losses. The switching of shunt capacitor banks at utility substations and on distribution feeders creates voltage and current transients in the power system which may be damaging to power system equipment. Transient overvoltages due to the energizing of capacitor banks are the most common source of overvoltages on many power systems. the transient occurs because of the difference between the system voltage and the voltage on the capacitor

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