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GE Multilin 750/760 Feeder Management Relay 5-25

5 SETPOINTS 5.4 S3 LOGIC INPUTS

5.4.8 TRANSFER FUNCTIONS

PATH: SETPOINTS ÖØ S3 LOGIC INPUTS ÖØ TRANSFER FUNCTIONS

The following logic input functions are used exclusively for the bus transfer scheme. Refer to Section 5.8.7: Transfer on

page 5–107 for details on implementing the bus transfer scheme.

If the bus transfer feature is required, all logic input functions necessary for the operation of this scheme must be

assigned to contact inputs before any other functions. This is to ensure there are no conflicts.

The

INCOMER 1(2) BRKR CLOSED setpoints are used to track breaker state, for prevent-parallel or permission-to-transfer

logic. THE CLOSE FROM INCOMER 1(2) setpoints signal the bus tie breaker to begin a close operation.

The

TIE BRKR CONNECTED setpoint is used to inhibit transfers if the breaker cannot be used to pass current from the source

to the load, such as when it is in the Test or Disconnected positions. The

TIE BRKR CLOSED setpoint is used to track breaker

state, for prevent-parallel or permission-to-transfer logic.

The TRANSFORMER LOCKOUT and SOURCE TRIP setpoints are used to initiate a transfer as Source 1(2) is about to be lost.

The

BLOCK TRANSFER setpoint disables the transfer scheme.

 TRANSFER FUNCTIONS

 [ENTER] for more

SELECT TO TRIP:

Disabled