These changes have notaltered 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 thepower 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 protectionrequirements for generators in general and for special protection that maybe required in some instances at the point of generator=power system interconnection.
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