Basler BE1-87G Specifikace stáhnout pdf (Strana 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.

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Basler BE1-87G Specifikace Strana 38