In this thesis a thorough investigation of 4-reactor shunt compensated systems under unbalanced fault-transient conditions has been carried out. Mathematical models for incorporating 4-reactor compensators into single and multi-section feeder systems, together with the technique used to simulate reactor saturation, are developed. The techniques are very general, are applicable to transposed and untransposed multi-conductor lines of any configuration, and can take into account the frequency dependence of system parameters. Using these techniques computer programs are developed to study : a - Effect of shunt-compensation on primary system response. b - System and reactor overvoltages. c - The probability of reactor saturation and its effect on primary system wave forms and hence on the performance of distance protection. d - Effect of shunt-compensation on the performance of distance protection.
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