S&C 6800 Series, Инструкция

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10 S&C Instruction Sheet 1045-510
Installation
9. Determine the value for the “RTN Time” setpoint.
Power must be restored to the faulted line segment for this amount of time (in
minutes) before the Return to Normal process will start. Enter this information on the
Setup—Restoration—IntelliTeam SG/II—Team X
screen.
10. Determine the Maximum Capacity for each team member.
The maximum capacity is the amount of load on the most limited line section
(because of conductor size, switch rating, etc.) served through a team member’s
location from either direction. Each member continuously subtracts its present load
from its
Maximum Capacity to determine its Local Capacity for Transfer . The small-
est Local Capacity for Transfer encountered in a particular restoration path deter-
mines the maximum load that the involved teams can transfer, the Available Capacity
to Transfer .
You will enter this information in the Maximum Capacity setpoint on the Setup—
Restoration—IntelliTeam SG/II—Team X screen.
11. Determine the alternate source sequence for each team.
Using the normal switch functionalities found in Step 7 , set the sequence in which
team members will be used to restore the line segment. This is an optional step that
can be used to guide the restoration process. Whether or not you have confi gured the
alternate source sequence list, restoration will progress in the following order. If the
fault is downstream of the team, the coach will: 1) try the normal source switch, 2) use
the Alternate Source Sequence (if applicable), 3) try any Tie switch(es), and 4) try any
Load-Tie switch(es). If the fault is upstream of the team, the coach will: 1) use the
Alternate Source Sequence (if applicable), 2) try any Tie switch(es), 3) try any
Load-Tie switch(es), and 4) try the normal source switch. Enter this information in
the
Alternate Source Sequence setpoints on the Setup—Restoration—IntelliTeam
SG/II—Team X screen.
12. Determine whether any “contracts” are required to avoid overloading a line
segment.
A bifurcated circuit acting as an alternate source for teams on both legs of the bifurca-
tion may become overloaded if those teams must act to restore load at close to, or
exactly, the same time. This overload may occur because those teams are not directly
related, and do not coordinate their reconfi guration activities.
To force the coordination between these unrelated teams you should set the
Contract Required setpoint to Yes on the Setup—Restoration—IntelliTeam SG/II—
Team X screen for teams that may add load to the alternate circuit during a reconfi gu-
ration event. The contract will prevent both teams from simultaneously closing to use
the alternate source. When team members encounter a line segment in a restoration
path that requires a contract, they will communicate with all subsequent line
segments in the direction of the alternate source to ensure that the source and line
segments will not be overloaded. The fi rst team contract to arrive at the source would
be approved if the team load would not overload the circuit. The second arriving con-
tract would be approved only if it would also not cause an overload.
The extra communication required to transmit the contracts slows down the recon-
fi guration process. Contracts are described in S&C Instruction Sheet 1045-540:
Loading Restrictions
on page 26 and
Contracts
on page 27.
13. Determine whether you need to limit the number of line segments restored
by a team.
If you want to limit the number of line segments that a team picks up, you will need to
enable the
Line Segment Limit setpoint, on the Setup—Restoration—IntelliTeam