Voltage Controlled Overcurrent (51V) - Siemens 7SR224 Technical Manual
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2.3
Voltage Controlled Overcurrent (51V)
37
49
(x2)
I
L1
(I
)
A
37
49
(x2)
I
L2
(I
)
B
37
49
(x2)
I
L3
(I
)
C
46
46
NPS
BC
(x2)
64
H
I
4
(I
/I
)
G
SEF
NOTE: The use of some
functions are mutually exclusive
27
V
27S
L1
59
(V
)
59S
A
(x4)
27
V
27S
L2
59
(V
)
59S
B
(x4)
27
V
27S
L3
59
(V
)
59S
C
(x4)
V
27
4
(V
)
59
X
Figure 2-3
Voltage Controlled Overcurrent
Voltage Inputs:
Current Inputs:
Disable:
51C, 46, 37, 49, 50CBF, 79
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
Gradually increase the a-b phase current or balanced 3P current until Pickup LED operates. Confirm result of
Phase O/C test above.
Reduce the applied voltage to a level such that V
Gradually increase the I
(I
12
AB
Note that these elements may be set as directional. If this is the case, the phase angle of the current must be set
with respect to the voltage to produce operation of the elements.
©2010 Siemens Protection Devices Limited
7SR224
67/
67/
81
50
51V
50
51
HBL
BF
(x4)
(x4)
2
67/
67/
81
50
51V
50
51
HBL
BF
(x4)
(x4)
2
67/
67/
81
50
51V
50
51
HBL
BF
(x4)
(x4)
2
60
60
CTS
VTS
67/
67/
67/
67/
50G
51G
50S
51S
(x4)
(x4)
(x4)
(x4)
Note:
Example shows
Voltage Config =
47
81
Van, Vbn, Vcn
(x2)
(x4)
74
59N
Batt
TCS
(x2)
Test
(x3)
Cap.
79
Test
V
(V
), V
(V
), V
L1
A
L2
B
L3
I
(I
), I
(I
), I
(I
),
L1
A
L2
B
L3
C
51-n/50-n - Self Reset
(V
) phase-phase voltage is less than 90% of the setting.
12
AB
) phase-phase current until Pickup LED operates.
7SR224 Argus Commissioning & Maintenance Guide
OC Phase
I
(I
L1
I
(I
L2
I
(I
L3
(V
)
C
Control Voltage
)
V
(V
)
A
12
AB
)
V
(V
)
B
23
BC
)
V
(V
)
C
31
CA
Chapter 6 Page 19 of 73
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