P74x/EN OP/N
(OP) 5-
The second algorithm, by integration of the secondary current, presumes of maximum flux in
the HV CT core.
The flux calculation starts when the first variation of current is detected, then if the calculated
flux reached 20% of the maximum flux, a CT saturation is presumed as shown in figure 21.
FIGURE 21: DETERMINATION OF SIGNAL QUALITY IN PERIPHERAL UNIT
CT saturation detection starts at the first variation of current detected and stop if there is no
variation during 100ms.
The third algorithm blocks the occurrence of saturation for as long as the current increases
during the first half-cycle.
Blocking starts upon detection of the first current variation. Then, as soon as the current is
reversed, CT saturation is permitted as shown below in figure 22.
FIGURE 22: DETERMINATION OF SIGNAL QUALITY IN THE PERIPHERAL UNIT
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