GE Multilin 750/760 Feeder Management Relay 5-123
5 SETPOINTS 5.8 S7 CONTROL
5
The current supervision feature is used to limit breaker wear. When fault current exceeds user-programmed levels, it
reduces the number of reclose shots permitted.
Once a reclose sequence is initiated, the maximum current measured on any phase is compared to the setpoint current lev-
els. The relay then determines the maximum number of shots allowed or whether the scheme goes immediately to lockout.
The lowest number of permitted shots, whether set by the MAX NUMBER OF RECLOSE SHOTS setpoint or the Current Supervi-
sion feature, always takes precedence unless current supervision takes the scheme to lockout. Lockout has the highest pri-
ority. Once the current supervision feature has reduced the total number of shots, a subsequent shot can still reduce the
limit further.
The fault current level above which the number of autoreclosure shots will be reduced to one, two, or three shots can be
selected. If the autoreclose scheme is to be taken directly to lockout without reclosing, set the
CURRENT SUPERVISION TO
LOCKOUT setpoint to "Enabled"
Figure 5–75: AUTORECLOSE CURRENT SUPERVISION LOGIC
Courtesy of NationalSwitchgear.com
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