7SR21 & 7SR22 Performance Specification
Unrestricted Page 46 of 68
© 2013 Siemens Protection Devices Limited
2.17.3 Operate and Reset Time
Attribute
Value
Starter operate time
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
±
t
cycle
Reset time
char = ANSI and
t
res
= 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
¹
DECAYING
t
res
,
±
1 % or
±
20 ms
Repeatability
±
1 % or
±
20 ms
Overshoot time
< 40 ms
Disengaging time
< 50 ms
Variation
f
nom
- 3 Hz
to
f
nom
+ 2 Hz
harmonics to
f
cutoff
£
5 %
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 ...
Page 2: ......
Page 4: ...Contents 7SR11 and 7SR12 Page 2 of 2 2018 Siemens Protection Devices Limited ...
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