7SR21 & 7SR22 Performance Specification
Unrestricted © 2013 Siemens Protection Devices Limited
Page 37 of 68
2.14.3
Operate and Reset Time
Attribute
Value
Starter operate time (
³
2
xIs
)
20 ms,
±
20 ms
t
op
Operate time
char
= IEC-NI,
IEC-VI,
IEC-EI,
IEC-LTI
[ ]
Tm
K
t
Is
I
op
´
-
=
1
a
,
±
5 % or
±
30 ms,
for char = IEC-NI : K = 0.14,
a
= 0.02
IEC-VI : K = 13.5,
a
= 1.0
IEC-EI : K = 80.0,
a
= 2.0
IEC-LTI : K = 120.0,
a
= 1.0
char
= ANSI-MI,
ANSI-VI,
ANSI-EI
[ ]
Tm
B
A
t
P
Is
I
op
´
ú
ú
û
ù
ê
ê
ë
é
+
-
=
1
,
±
5 % or
±
30 ms,
for char = ANSI-MI : A = 0.0515, B = 0.114, P = 0.02
ANSI-VI : A = 19.61, B = 0.491, P = 2.0
ANSI-EI : A = 28.2,
B = 0.1217, P = 2.0
char
= DTL
t
d
,
±
1 % or
±
20ms
Reset time
ANSI DECAYING
[ ]
Tm
R
t
Is
I
res
´
-
=
1
2
,
±
5 % or
±
30 ms,
for char = ANSI-MI : R = 4.85
ANSI-VI : R = 21.6
ANSI-EI : R = 29.1
t
res
t
res
,
±
1 % or
±
20 ms
Repeatability
±
1 % or
±
20 ms
Overshoot time
< 40 ms
Disengaging time
< 50 ms
Figure 2.2 shows the operate times for the four IEC IDMTL curves with a time multiplier of 1. Figure 2.3 and
Figure 2.4 show the ANSI operate and reset curves. These operate times apply to non-directional characteristics.
Where directional control is applied then the directional element operate time should be added to give total
maximum operating time.
Summary of Contents for Argus 7SR21
Page 1: ...Energy Management 7SR21 7SR22 Argus Overcurrent Relay Reyrolle Protection Devices ...
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