Every Generator & Transformer Protection question asked in RRB JE, Supervisor Instructor, GPSSB AAE Electrical, Vidyut Sahayak JE — solve, check instantly, then read the formula and exam tip.
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View answer & solution
C — System stability and safety of the alternator. Excess current from a fault or severe overload overheats the winding and creates damaging electromagnetic forces; overcurrent protection disconnects the machine in time.
View answer & solutionA Buchholz relay is a gas- and oil-surge-operated relay on oil-immersed transformers with a conservator. It alarms on slow internal faults and trips on severe internal faults.
View answer & solutionA — Reverse Power relay. It detects active power flowing from the energized system into the alternator when the prime mover can no longer supply sufficient mechanical power.
View answer & solutionC — Balanced earth fault. This is the protection scheme associated with the 1–5 MVA generator range in the supplied paper.
