GE MiCOM P143 Agile User Manual

Curve Description
b constant a
constant
L constant
IEC Very Inverse Operate 13.5 1 0
IEC Very Inverse Reset 50.92 2.4 0
IEC Extremely Inverse Operate 80 2 0
IEC Extremely Inverse Reset 44.1 3.03 0
UK Long Time Inverse Operate* 120 1 0
BPN (EDF) Operate* 1000 2 0.655
UK Rectifier Operate* 45900 5.6 0
FR Short Time Inverse Operate 0.05 0.04 0
Rapid Inverse (RI) characteristic
The RI operate curv
e is represented by the following equation:
t K
M
op
=
−










1
0 339
0 236
.
.
where:
● t
op
is the operating time
● K is the Time Multiplier setting
● M is the ratio of the measur
ed curr
ent divided by the threshold current (I/I
s
)
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:
t TD
M
L C
op
=
−
+






+
β
α
1
and the IEEE IDMT Reset equation is:
t TD
M
r
=
−






β
α
1
where:
● t
op
is the operating time
● t
r
is the r
eset time
● TD is the Time Dial setting
● M is the ratio of the measured current divided by the threshold current (I/I
s
)
●
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)
Chapter 6 - Current Protection Functions P14x
92 P14xEd1-TM-EN-1

GE MiCOM P143 Agile Specifications

General

Brand	GE
Model	MiCOM P143 Agile
Category	Control Unit
Language	English