Considering the large capital investment and the numerous possibilities for electrical system disturbances, control instrumentation malfunctions, and operator errors that can allow generators to operate outside of their original design specifications, it makes good business sense to apply protective relays that can prevent generator damage during abnormal operating conditions. This chapter will cover the gathering of information needed to calculate 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.
A good starting ...
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