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7SR18 Commissioning & Maintenance Guide
4.5
M
AGNETISING
I
Current Inputs:
Disable:
Map Pickup LED:
Logical operation of the harmonic blocking can be tested by current injection at 100 Hz to cause operation of the
blocking signals.
Unrestricted Page 50 of 54
I
D
NRUSH
ETECTOR
37
(x2)
I
(I
)
L1
A
37
(x2)
I
(I
)
L2
B
37
(x2)
(I
)
L3
C
46
BC
I
(I
)
4
G
Figure 4.5-1
I
(I
), I
(I
), I
L1
A
L2
B
(81HBL2)
50
50
49
BF
(x2)
50
50
49
BF
(x2)
50
50
49
BF
(x2)
46
60
50N
NPS
CTS
(x2)
(x2)
50G
50
(x2)
BF
NOTE: The use of some
functions are mutually exclusive
Magnetising Inrush Detector
(I
),
L3
C
©2018 Siemens Protection Devices Limited
81
51
HBL
51c
(x2)
2
81
51
HBL
51c
(x2)
2
81
51
HBL
51c
(x2)
2
51N
(x2)
51G
(x2)
74
T/
CCS
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