Merlin Gerin Varlogic NR12, User Manual

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USER´S MANUAL
e) Optimal Program :
The optimal program operates with many step configurations:
1.1.1.1.1 1.2.2.2.2 1.2.4.4.4 1.2.4.8.8 1.1.2.2.2
1.1.2.3.3 1.1.2.4.4 1.2.3.3.3 1.2.3.4.4 1.2.3.6.6
The target cos power is reached using the fewest number of steps in minimal time. Like the
circular program, this algorithm equalises the usage of steps.
This program uses optimally selected steps sizes when approaching the target power and at
the same time the response delays are shortened, particularly if there is a large requirement for
kvar or if the network suddenly becomes capacitive.
Comparison between normal and optimal program:
Normal program will reach the cos target value by successive connection/disconnection of
kvar corresponding to the smallest step value.
Optimal program will reach the target cos value by successive connection/disconnection of
kvar corresponding to the highest relevant and available step value
Figure 20: Circular B program -
Operation sequence 1:2:2
Figure 19: Circular A program - Operation
sequence 1:1:1
Step Step number
demand 1 2 3 4 5 6
+ X
+ X X
+ X X X
+ X X X X
- X X X
- X X
+ X X X
+ X X X X
- X X X
- X X
+ X X X
+ X X X X
- X X X
Step Step number
demand 1 2 3 4 5 6
+ X
+ X X
+ X X X
- X X
+ X X X
+ X X X X
- X X X
- X X
- X
+ X X
+ X X X
+ X X X X
+ X X X X X
- X X X X
- X X X
- X X