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GRD150
5
Figure 2 - Operate and Reset Characteristics of IDMTL
Inverse Time Operate and Reset Curves
IEC/UK Inverse Curves
(Time Muliplier TMS = 1)
0.1
1
10
100
1000
1
10
100
Current (Multiple of Setting)
Oper
at
ing Tim
e (
s)
LTI
NI
VI
EI
IEEE/US Inverse Curves
(Time Multiplier TMS = 1)
0.1
1
10
100
1
10
100
Current (Multiple of Setting)
Ope
ra
ting Tim
e (s
)
MI
VI
STI
I
EI
IEEE/US Reset Curves
(Time Multiplier TMS = 1)
1.00
10.00
100.00
1000.00
0.1
1
Current (Multiple of Setting)
Tim
e (s
)
MI
VI
EI
STI
I
( )
⎪
⎭
⎪
⎬
⎫
⎪
⎩
⎪
⎨
⎧
+
⎥
⎥
⎥
⎦
⎤
⎢
⎢
⎢
⎣
⎡
−
×
=
c
Is
I
k
TMS
t
1
α
⎥
⎥
⎥
⎥
⎦
⎤
⎢
⎢
⎢
⎢
⎣
⎡
⎟
⎠
⎞
⎜
⎝
⎛
−
×
=
2
1
S
r
I
I
t
RTMS
t
Inverse time operate function
Dependent time reset function
Constants for dependent time curves
Curve Description
k
α
C t
r
IEC Normal Inverse (NI)
0.14 0.02 0
-
IEC Very Inverse (VI)
13.5 1 0 -
IEC Extremely Inverse (EI)
80 2 0 -
UK Long Time Inverse (LTI)
120 1 0 -
IEEE Moderately Inverse (MI)
0.0515
0.02 0.114 4.85
IEEE Very Inverse (VI)
19.61 2 0.491
21.6
IEEE Extremely Inverse (EI)
28.2 2
0.1217
29.1
US CO8 Inverse (I)
5.95 2 0.18
5.95
US CO2 Short Time Inverse (STI)
0.02394
0.02 0.01694 2.261
Содержание GRD150
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