MGVCL Exam Paper (30-07-2021 Shift 1)
Consider the following statements and choose the correct option: Statement 1: The magnitude of earth fault current for a given fault position within a winding depends upon the method of neutral grounding. Statement 2: Earth fault protection for an electric motor is provided by means of instantaneous overcurrent relay.
The magnitude of earth fault current for a given fault position within a winding demands upon the winding connections and method of neutral grounding. Earth fault protection for an electric motor is provide by instantaneous relay having a setting of approximately 30% of motor rated current in the residual circuits of two CTs and with ground wire.
The V-curves of a synchronous motor show relationship between Armature current (Ia) and Excitation current (If). The Inverted V-curves of a synchronous motor show relationship between power factor (pf) and field excitation (If).