•
If any adjacent Double Breakers DBx-A and DBx-B (on the same node Nx) are both
Closed, then every transformer whose DBx-A or DBx-B double breaker is Closed is
in parallel with each other. For example, if DB8-A and DB8-B are Closed, then if
DB1-A, DB2-B, DB3-B, DB4-A, DB5-B, DB6-B, DB7-A are Closed, then all
transformers are paralleled.
•
There can be a maximum of two Paralleling Groups, only if none of the adjacent
Double Breakers DBx-A and DBx-B (on the same node Nx) are both Closed. For
example, if DB1-A, DB2-B, DB3-A, DB4-B, DB5-A, DB6-B, DB7-A, DB8-B then
T1,T3,T5,T7 are in one group and T2, T4, T6, T8 are in the other group.
Table 58:
Double Bus Truth Table
XFMR Position
DA(x) Double
Breaker
DB(x) Double
Breaker
LB(x) Line Breaker Parallel Condition
X
1
0
0
0
0
1
0
0
0
0
1
0
1
0
1
1
0
1
1
2
1
1
1
3
1
1
0
3
•
Parallel Condition = 0 The transformer at position "X" is not contributing to any load
and not paralleling
•
Parallel Condition = 1 The transformer at position "X" is contributing to Low Side
Bus A and is in Paralleling Group 1
•
Parallel Condition = 2 The transformer at position "X" is contributing to Low Side
Bus B and is in Paralleling Group 2
•
Parallel Condition = 3 The Low Side Bus A and Low Side Bus B are tied together,
therefore all transformers whose Parallel Condition = 1 or 2, are in parallel
If a unit has either Tie Breaker closed, and any other unit has both closed,
then the first unit (with one Tie Breaker closed) is still paralleled on both
buses.
6.3.3.2
Grouping operation algorithm (GOA)
This GOA determines the action that is taken by the control when it detects any Open Tie
Breakers in the network.
Section 6
1VAC388793-MB A
Configuration
434
TCC300
User Manual
Summary of Contents for TCC300
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