TRENDnet BE1-87G User Manual
Page 38
5-12
BE1-87G - Testing And Setting
Inequality (1) is met with CT #2, but not with CT #1. However, since the maximum external fault current is only
4.6 times CT rating [vs. the assumption of 20 times rated for inequality (1)], the application is suitable.
SFR = (100/50)*(0.36/0.19) = 3.8
Using the SFR 4 column of Table 5-1, a 0.8 ampere setting is indicated. However, based on the note
accompanying this table, choose the next higher setting of 1.6, because CT #1 has a T classification, and CT
#2 has a C classification. The T classification indicates that the CT has significant secondary leakage
inductance which somewhat degrades the transient performance. This is a concern during motor starting
because a slowly decaying offset component develops in at least one phase.