ABSTRACT
Considering the large capital investment and the numerous possibilities for electrical system disturbances, control and equipment failures, and maintenance and operating errors, which can force generators to operate outside their original design specifications, it makes good business sense to apply protective relays that can prevent generator damage from abnormal operating conditions. This chapter will cover the gathering of the information needed to calculate generator protective relay settings, the setting calculations for the various protective functions, typical generator/turbine withstand times for abnormal operating conditions, and the math associated with various types of impedance elements.
