BE1-951
Protection and Control
4-9
7 9 R T D
7 9 R T D
7 9 R T D
7 9 R T D
7 9 R T D
R E S E T
7 9 1 T D
7 9 2 T D
7 9 3 T D
7 9 4 T D
L O C K O U T
R E S E T
Manual Close
1
2
3
4
5
1
RESET
TIMER
79C
Recloser
STEP
P0002-08
08-18-00
SG0
SG1
SG2
SG3
Figure 4-6. Example 2 Error in Setting Group Control by Recloser Shot
Example 3:
When a relay reclose operation reaches a lockout condition, the user may want a special setting group to
be enabled before the next manual close. The following settings would be one way of handling this
condition. With these settings, in normal operation the relay is in setting group 0. After the first and
subsequent recloses, the relay would use setting group 1. Upon reaching a lockout condition, the automatic
mode is disabled, manual logic control takes over, and the relay begins to use setting group 2. Once the
breaker is closed, the relay will be in group 2 until the recloser times to reset. At that time, automatic group
control is restored and the active group will return to group 0. An alternative method to get into group 2 for
this scenario would be to use the cold load pickup feature for group 2 as described in the previous section.
SL-GROUP = 1,0,0,79LO,0,/79LO
SP-GROUP1 = 0,0,0,0,791
SP-GROUP2 = 0,0,0,0,51P
SP-GROUP3 = 0,0,0,0,51P
