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 significant
effect on the range of the size of generators that are connected to and operated
in parallel with power systems. Many small 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-specific
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.
