Cold Load (51C); Figure 2-4 Cold Load - Siemens 7SR224 Manual

2.4

Cold Load (51C)

I
(I /I
G
V
(V
V
(V
V
(V
(V
Figure 2-4 Cold Load
Voltage Inputs:
Current Inputs:
Disable: 51V, 46, 49, 50CBF, 79
Map Pickup LED:
The CB must be open for more than the Cold Load Pick-up Time to allow testing of this function. It may be
convenient to reduce this setting to suit the test procedure. If the CB is open throughout the tests, the Cold Load
protection settings can be tested provided that the current is not allowed to fall below the level of the Reduced
Current Level for more than the Reduced Current Time during testing. It may be convenient to set the Reduced
Current setting to Disabled for the duration of the test. The Cold Load Active output is provided and can be used
as an indication during testing.
©2010 Siemens Protection Devices Limited
37 50
49
(x2) BF
I
L1
(I )
A
37 50
49
(x2) BF
I
L2
(I )
B
37 50
49
(x2) BF
I
L3
(I )
C
46
46 60
NPS
BC CTS
(x2)
67/
64
50G
H
4 (x4)
)
SEF
NOTE: The use of some
functions are mutually exclusive
27
27S
L1
59
) 59S
A
(x4)
27
27S
L2
59
) 59S
B
(x4)
27
27S
L3
59
) 59S
C
(x4)
V 27
4
) 59
X
V (V ), V (V ), V
L1 A L2 B L3
I (I ), I (I ), I (I ),
L1 A L2 B L3 C
51-n - Self Reset
7SR224 Argus Commissioning & Maintenance Guide
7SR224
67/ 67/ 81
51V 50 51 HBL
(x4) (x4) 2
67/ 67/ 81
51V 50 51 HBL
(x4) (x4) 2
67/ 67/ 81
51V 50 51 HBL
(x4) (x4) 2
60
VTS
67/ 67/ 67/
51G 50S 51S
(x4) (x4) (x4)
Note:
Example shows
Voltage Config =
47
81 Van, Vbn, Vcn
(x2) (x4)
74
59N Batt
TCS
Test
(x2)
(x3)
Cap.
79
Test
(V ) for directional elements
C
Chapter 6 Page 21 of 73