Siemens Argus 7SR21 Technical Manual page 585
Overcurrent relay
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- Manual (71 pages) ,
- Installation manual (22 pages) ,
- Manual (69 pages)
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3.5
Load Blinder (21)
I
L1
(I
)
A
I
L2
(I
)
B
I
L3
(I
)
C
I
4
(I
)
G
I
5
(I
)
SEF
V
L1
(V
)
A
V
L2
(V
)
B
V
L3
(V
)
C
V
4
(V
)
X
Voltage Inputs:
Current Inputs:
Disable:
Map Pickup LED:
Load Blinders are designed to block Overcurrent elements from tripping in heavy load conditions.
User settings 21LB-3P Angle and 21LB-3P Impedance allow user to define the Blinder region depending on the
networks or specifically a line's loading and fault limits.
The calculated impedance can be: -
· In Blinder Region in which case the Load Blinder FWD or REV is active depending on if the impedance is
st
th
in the 1
or 4
and/or 2
· In operate region in which case there is no active Load Blinder block and the Overcurrent element
operates depending on additional factors.
· A 5 degree Hysteresis is allowed between operate and block zone.
© 2013 Siemens Protection Devices Limited
37
50
49
(x2)
BF
37
50
49
(x2)
BF
37
50
49
(x2)
BF
46
46
60
NPS
BC
CTS
(x2)
50
37
BF
50
37
BF
NOTE: The use of some
functions are mutually exclusive
27
59
(x4)
27
47
59
(x2)
(x4)
27
59
(x4)
27
59
Optional
79
25
Figure 3.5-1
V
(V
), V
(V
), V
L1
A
L2
B
I
(I
), I
(I
), I
L1
A
L2
B
L3
51-n, 51V, 51c, 46, 49, 50BF, 79
21LB-3P, 21LB-1P - Self Reset
nd
rd
or 3
quadrant of the R-X plot respectively.
7SR210 & 7SR220 Commissioning & Maintenance Guide
7SR22
60
67 / 50 /
50
21
CTS-
51V
51( x 4 )
AFD
LB
I
60
67 / 50 /
50
21
51V
CTS-
51( x 4 )
AFD
LB
I
60
67 / 50 /
50
21
51V
CTS-
51( x 4 )
AFD
LB
I
67/
60
51c
50 /51N
VTS
( x 4 )
67/
37G
50/51G
(x2)
( x 4 )
67/
64
37S
50/51S
H
(x2)
( x 4 )
81
(x6)
59N
74
(x2)
TCS
Load Blinder (21)
(V
)
L3
C
(I
),
C
81
51c
HBL
2
81
51c
HBL
2
81
51c
HBL
2
81
HBL
2N
Page 73 of 82
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