P44x/EN AP/Hb
MiCOM P40 Agile P442, P444
(AP) 5-
5.2.1.1 General CB Control logic
Figure 94: General circuit breaker control logic
5.3 CT and VT ratio
For each Terminal (connected to the secondary of a High voltage CT), the following values
have to be known.
5.3.1 CT Ratios
Only 3 values have to be known and entered:
1. Phase CT Primary current (from 1 to 30000 A) given by the manufacturer.
2. Phase CT secondary current (1 or 5 A) given by the manufacturer.
3. Polarity (Standard (towards the bar) or Inverted (opposite the bar)
Note: For the busbar protection reference 2 values have to be entered:
4. Phase reference CT Primary current (from 1 to 30000 A).
5. Phase reference CT secondary current (1 or 5 A).
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