Siemens Argus 7SR21 Technical Manual page 532
Overcurrent relay
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- Manual (71 pages) ,
- Installation manual (22 pages) ,
- Manual (15 pages)
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7SR210 & 7SR220 Commissioning & Maintenance Guide
2.3
Voltage Controlled Overcurrent (51V)
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:
Shaped Phase Overcurrent elements 51-n should be tested for pick-up and timing before this function is tested.
The General Pickup LED can be used to assess operation of this function if other functions are disabled or if the
setting allocating General Pickup is temporarily modified.
Apply nominal 3 phase balanced voltage. Apply 3 phase balanced current at a level below the normal 51-n setting
but above the effective 51V-n setting. Ensure that the thermal rating of the relay is not exceeded. Gradually
reduce the voltage until the a-b voltage is less than the Voltage setting. Pickup LED operation can be used to
confirm the Voltage setting. If the 51V-n current setting is above the continuous rating of the relay an alternative
procedure should be used, apply test current in short duration shots with applied voltage being gradually reduced
for each subsequent shot.
Apply nominal 3 phase balanced voltage. Reduce the voltage such that the a-b voltage is 110 % of the Voltage
setting.
Page 20 of 82
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 2.3-1
Voltage Controlled Overcurrent
V
(V
), V
(V
), V
L1
A
L2
B
I
(I
), I
(I
), I
L1
A
L2
B
L3
51c, 46, 37, 49, 50BF, 79
51-n/50-n - Self Reset
7SR22
60
67/
67/
50
CTS-
51V
50
51
AFD
I
(x4)
(x4)
67/
67/
60
50
51V
50
51
CTS-
AFD
I
(x4)
(x4)
67/
67/
60
50
51V
50
51
CTS-
AFD
(x4)
(x4)
I
67/
67/
60
50N
51N
51c
VTS
(x4)
(x4)
67/
67/
50G
51G
(x4)
(x4)
67/
67/
64
50S
51S
H
(x4)
(x4)
81
(x6)
59N
74
(x2)
TCS
(V
)
L3
C
(I
),
C
© 2013 Siemens Protection Devices Limited
81
51c
HBL
2
81
51c
HBL
2
81
51c
HBL
2
81
HBL
2N
37G
(x2)
37S
(x2)
OC Phase
Control Voltage
I
(I
)
V
(V
L1
A
12
I
(I
)
V
(V
L2
B
23
I
(I
)
V
(V
L3
C
31
)
AB
)
BC
)
CA
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