This guide was developed to assist in the selection of relays to protect a generator. A large number of relays is available to protect for The basic principles offered here apply equally to individual relays and to multifunction numeric packages. The engineer must balance the expense of applying a particular relay against the consequences of losing a generator. Damage to and loss of product in continuous processes can represent the domi- nating concern rather than the generator unit. One possible common dividing point is that the extra Current transformers needed for current differential protection are less commonly seen on generators less than 2MVA, ngenerators rated less than 600V, and generators that are never paralleled to other generation.
Generator Protection Guide
