Fig. 9 shows full interconnection protection for a typical wyegrounded
primary winding interconnection transformer. The full
interconnection protection for a typical ungrounded
interconnection transformer is shown in Fig. 10. For the
ungrounded interconnection transformers, neutral voltage relays
(59N, 27N) provide the detection for supply ground faults. As
previously stated, the functional levels of interconnection protection
vary widely depending on factors such as: generator size, point of
interconnection to the utility distribution system, type of generator
(induction, synchronous, asynchronous) and interconnection
transformer configuration. The engineer typically selects the
protection functions that are appropriate for a specific application
Fig. 9 shows full interconnection protection for a typical wyegrounded
primary winding interconnection transformer. The full
interconnection protection for a typical ungrounded
interconnection transformer is shown in Fig. 10. For the
ungrounded interconnection transformers, neutral voltage relays
(59N, 27N) provide the detection for supply ground faults. As
previously stated, the functional levels of interconnection protection
vary widely depending on factors such as: generator size, point of
interconnection to the utility distribution system, type of generator
(induction, synchronous, asynchronous) and interconnection
transformer configuration. The engineer typically selects the
protection functions that are appropriate for a specific application
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