North American Standards - GE MiCOM P40 Agile Technical Manual

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Chapter 6 - Current Protection Functions
Curve Description
IEC Very Inverse Operate
IEC Very Inverse Reset
IEC Extremely Inverse Operate
IEC Extremely Inverse Reset
UK Long Time Inverse Operate*
BPN (EDF) Operate*
UK Rectifier Operate*
FR Short Time Inverse Operate
Rapid Inverse (RI) characteristic
The RI operate curve is represented by the following equation:
=
t
K
op
0 339
.
where:
t
is the operating time
op
K is the Time Multiplier setting
M is the ratio of the measured current divided by the threshold current (I/I
Note:
* When using UK Long Time Inverse, BPN, UK Rectifier, FR Short Time Inverse, or RI for the Operate characteristic, DT (Definite
Time) is always used for the Reset characteristic.
2.1.3

NORTH AMERICAN STANDARDS

The IEEE IDMT Operate equation is:
β
=
t
TD
α
op
M
and the IEEE IDMT Reset equation is:
β
=
t
TD
α
r
1
M
where:
t
is the operating time
op
t
is the reset time
r
TD is the Time Dial setting
M is the ratio of the measured current divided by the threshold current (I/I
b is a constant, which can be chosen to satisfy the required curve characteristic
a is a constant, which can be chosen to satisfy the required curve characteristic
C is a constant for adding Definite Time (Definite Time adder)
L is a constant (usually only used for ANSI/IEEE curves)
92
b constant
13.5
50.92
80
44.1
120
1000
45900
0.05
1
0 236
.
M
+
 +
L
C
1
a constant
1
2.4
2
3.03
1
2
5.6
0.04
)
s
)
s
P14x
L constant
0
0
0
0
0
0.655
0
0
P14xEd1-TM-EN-1

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