ABSTRACT
The nature of generation systems, the locations where they are connected to the power grid, generation ownership, and oversight of generation facilities have changed dramatically over the last 10 years. The evolution that has occurred in these areas was introduced in Chapter 1. These changes have not altered the basic requirements needed to provide good protection for the generator units themselves. These changes, however, have had a signicant effect on the range of the size of generators that are connected to and operated in parallel with power systems. Many smaller units are currently connected to power systems than in the past. Protection requirements need to relate to the value of the equipment protected. As such, protection requirements for large units differ from those for smaller units. Furthermore, the location in the power system at which a generator is connected can create site-specic hazards to the generator as well as to the power system to which it is connected. The information provided in this chapter covers protection requirements for generators in general and for special protection that may be required in some instances at the point of generator/power system interconnection.
