Page 271 - Offshore Electrical Engineering Manual

258 CHAPTER 7 Protection and Discrimination

FIGURE 4.7.3
Overcurrent protection coordination chart – low voltage system.

CT SATURATION

It is necessary to check for CT saturation where it is considered to be a likely condi-
tion. The saturated CT current may be obtained as follows:
CT rated VA × Accuracy limit factor × CT ratio
I max sat =
Secondary burden at rated current