1. Exciter and rotor winding are isolated from earth, so how can you detect an earth fault in the rotor circuit? 2. Mark the protection zone for the differential relay, which relay protects if the fault appears outside this zone.

1. Exciter and rotor winding are isolated from earth, so how can you detect an earth fault in the rotor circuit? 2. Mark the protection zone for the differential relay, which relay protects if the fault appears outside this zone.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter10: System Protection

Section: Chapter Questions

Problem 10.29P

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Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors. The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.

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I need answer within 20 minutes please please with my best wishes

1. Exciter and rotor winding are isolated from earth, so how can you detect an earth fault
in the rotor circuit?
2. Mark the protection zone for the differential relay, which relay
protects if the fault appears outside this zone.

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