Cold Load (51C) - Siemens Argus 7SR21 Technical Manual

7SR210 & 7SR220 Commissioning & Maintenance Guide
2.4

Cold Load (51c)

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:.
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.
Page 22 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 2.4-1
V (V ), V (V ), V
L1 A L2 B
I (I ), I (I ), I
L1 A L2 B L3
51V, 46, 49, 50BF, 79
51-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
Cold Load
(V ) for directional elements
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)