Update Documentation P341/EN AD/F43
MiCOM P341
(AD) -19
S = Constant
M = /s
Curve Description Standard S
Moderately inverse IEEE 4.85
Very inverse IEEE 21.6
Extremely inverse IEEE 29.1
Inverse US 5.95
Short time inverse US 2.261
The RI curve (electromechanical) has been
included in the first stage characteristic setting
options for Phase Overcurrent and Earth Fault
protections. The curve is represented by the
following equation:
t = K x
1
0.339 -
()
0.236
/
M
in seconds
With K adjustable from 0.1 to 10 in steps of
0.05
M = /s
Curve 4
Curve 1
Curve 2
Curve 3
1000
100
10
1
0.1
100.010.01.0
Current (Multiples of Is)
Operating Time (s)
Curve 1 Standard inverse
Curve 2 Very inverse
Curve 3 Extremely inverse
Curve 4 UK long time inverse
IEC Curves
P2136ENa
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