Basler Electric BE1-87T - Manual (Page 102)

5-6 BE1-87T Test Procedures 9171300990 Rev V
Check:
Therefore: Use Equation 3 or 3a.
From Figure 1-2 (the percentage restraint characteristic of the BE1-87T at 15% slope), the minimum
current where trip occurs is:
In terms of current, the trip current is:
Using Equation 3a:
( )
I
trip 2
1 015 6 38
2
9 69
= − × ×
=
.
.
. A
NOTE
The relay operates on maximum restraint. By reducing the current of one input,
the published trip/non-trip regions are as defined by Figure 1-2.
I balance
slope
2
0 35
100
< > (in pu)
3 < 2.333
.
0 35
0 15
3 < >
.
.
) (
I trip
2
3 pu (1 - 0.15)
= 2.55 pu
=
I trip
2
2.55 pu (Tap)
= (2.55) (3.8)
= 9.69 A 6% 100 mA
=
± ±