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11.2.1.2
User-programmable inverse-time characteristics
The user can define curves by entering parameters into the following standard formula:
t s
A
I
I
E
B k
c
[ ]
=
>
−
+
⋅
A060641 V3 EN
(Equation 174)
t[s] Trip time (in seconds)
A
set
Curve parameter A
B
set
Curve parameter B
C
set
Curve parameter C
E
set
Curve parameter E
I
Measured current
I>
set
Pickup value
k
set
Time multiplier
11.2.1.3
RI and RD-type inverse-time characteristics
The RI-type simulates the behavior of electromechanical relays. The RD-type is a ground-
fault specific characteristic.
The RI-type is calculated using the formula
t s
k
I
I
[ ]
.
.
=
−
×
>
0 339
0 236
A060642 V2 EN
(Equation 175)
The RD-type is calculated using the formula
t s
I
k
I
[ ]
.
.
=
−
×
× >
5 8 1 35 In
A060643 V2 EN
(Equation 176)
1MAC059074-MB A
Section 11
General function block features
615 series ANSI
1097
Technical Manual
Содержание Relion 615 series
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