Power System Protection Manual Klipsch （电力系统保护手册Klipsch）.pdf

Power System Protection Manual Note: This manual is in the formative stage. Not all the experiments have been covered here though they are operational in the laboratory. When the full manual is ready, we will make it available here. Electrical Engineering Department, Birla Vishvakarma Mahavidyalaya (BVM) Engineering College, Vallabh Vidyanagar, Gujarat, India Pin:388120. Experiment No-1 Radial Feeder Protection Theoretical Background: Whole of the power system can be subdivided in to number of radial feeders fed from one end. Generally such radial feeders are protected by over current and earth fault relays used as primary relays for 11 kV and 66 kV lines. For lines of voltage rating beyond 66 kV, distance protection is applied as a primary protection whereas over current and earth fault relays are used as back up relays. A simplified radial feeder network without transformers (in actual practice transformers do exist at substations) is shown in single line diagram of fig. 1.1 below. Section ISection I SecSecttion IIion II SecSecttion IIIion III SS SoSoururcece AA TTrrananssmmissiissioonn BB CC DD LiLinnee R1R1 R2R2 R3R3 FuseFuse ToTo LoLoadad