Generator Protection Relay Panel : Composition and Function
Integrating protection, measurement, and communication, the Generator Protection Relay Panel can realize the protection and control of various units, enabling unattended or minimally attended operation. It can achieve generator differential protection, rotor earth fault protection, stator earth fault protection, excitation protection, overcurrent protection, overvoltage protection, overload protection, backup protection, etc.
2025/11/25
Generator Overfrequency Protection: Working Principle, Function, and Setting Calculation
In our previous session, we covered the working principle, function, and setting calculation of generator Underfrequency Protection. Today, we will discuss the working principle, function, and setting calculation of generator Underfrequency Protection, as detailed below: Generator Overfrequency Protection, internationally standardized under ANSI/IEEE C37.2 as code 81O, operates on the core principle of continuously monitoring the AC voltage frequency at the generator terminals or the point of interconnection.
2025/10/22
Generator Underfrequency Protection: Working Principle, Function, and Setting Calculation
Generator Underfrequency Protection, internationally standardized under ANSI/IEEE C37.2 as code 81, operates on a core principle of continuously monitoring the AC voltage frequency at the generator terminals or at the station auxiliary bus.
Relationship between Frequency and Speed: For a synchronous generator, the output electrical frequency f is directly proportional to the rotor speed N and the number of pole pairs P (f = (P * N) / 120). Therefore, a decrease in system frequency directly indicates a decrease in the prime mover (turbine) speed, signifying that the mechanical input power is less than the electrical output power, putting the generator in a motoring condition.
2025/10/21
