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7SR11 & 7SR12 Commissioning and Maintenance Guide
2.18 Power Factor (55)
I
(I
)
L1
A
I
(I
)
L2
B
I
(I
)
L3
C
I
(I
)
4
G
V
(V
)
L1
A
V
(V
)
L2
B
V
(V
)
L3
C
Voltage Inputs:
Current Inputs:
Disable:
Map Pickup LED:
Apply balanced 3 phase rated voltage and current. Increase current phase angle until the LED assigned to '55-n'
is lit. Record this angle in the table below. Decrease the angle until the LED resets. Record the angle.
55 Setting
55-1
55-2
If the element is set as 55-n U/C Guarded, the setting can be tested by applying the test current at a level below
the 55-n U/C Guard Setting at a power in the operate range. Increase the current until the relay operates.
UCG
UCG
Power element
Setting
Used for test
(xIn)
Power
Factor
©2017 Siemens Protection Devices Limited
37
32
50
49
(x2)
(x2)
BF
37
32
50
49
(x2)
(x2)
BF
37
32
50
49
(x2)
(x2)
BF
46
60
46
NPS
CTS
BC
(x2)
32S
50BF
NOTE: The use of some
27
functions are mutually exclusive
59
(x4)
27
47
81
59N
59
(x2)
(x4)
(x2)
(x4)
27
59
(x4)
Optional
79
Figure 2-21
Power Factor
V
(V
), V
(V
), V
(V
)
L1
A
L2
B
L3
C
I
(I
), I
(I
), I
(I
),
L1
A
L2
B
L3
C
49
55-n - Self Reset
Angle
Blocked
Unblocked
Current
Current
(D.O.)
50
67/
67/
55
AFD
51V
50
51
(x2)
(x2)
(x4)
(x4)
50
67/
67/
55
AFD
51V
50
51
(x2)
(x2)
(x4)
(x4)
50
67/
67/
55
AFD
51V
50
51
(x2)
(x2)
(x4)
(x4)
67/
67/
60
50N
51N
VTS
(x4)
(x4)
67/
67/
50 G/
51 G/
SEF
SEF
Note:
Example shows
Voltage Config =
Van, Vbn, Vcn
74
T/
CCS
Pick-Up
(P.U.)
7SR12
81
HBL
51c
2
81
HBL
51c
2
81
HBL
51c
2
64H
Drop-Off
NOTES
Chapter 6 Page 58 of 72
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