Siemens Argus 7SR21 - Page 591

7SR210 & 7SR220 Commissioning & Maintenance Guide
© 2013 Siemens Protection Devices Limited Page 79 of 82
3.1 Over Fluxing Detector. (81HBL5)
7SR22
46
BC
46
NPS
(x2)
37
(x2)
49
50
BF
V
L1
(V
A
)
V
L2
(V
B
)
V
L3
(V
C
)
V
4
(V
X
)
I
L1
(I
A
)
81
HBL
5
37
(x2)
49
50
BF
I
L2
(I
B
)
81
HBL
5
37
(x2)
49
50
BF
I
L3
(I
C
)
81
HBL
5
60
CTS
I
4
(I
G
)
I
5
(I
SEF
)
74
TCS
NOTE: The use of some
functions are mutually exclusive
67/
50
(x4)
67/
51
(x4)
67/
50N
(x4)
67/
50
(x4)
67/
50
(x4)
67/
51
(x4)
67/
51
(x4)
67/
51N
(x4)
67/
50G
(x4)
67/
51G
(x4)
67/
50S
(x4)
67/
51S
(x4)
64
H
27
59
27
59
(x4)
27
59
(x4)
27
59
(x4)
47
(x2)
81
(x6)
79
Optional
59N
(x2)
Note:
Example shows
Voltage Config =
Van, Vbn, Vcn
81
HBL
2N
81
HBL
2G
60
CTS-
I
60
VTS
51V
51V
51V
37G
(x2)
37S
(x2)
51c
51c
51c
Figure 3.1-1 Magnetising Inrush Detector
Voltage Inputs: n/a
Current Inputs: I
L1
(I
A
), I
L2
(I
B
), I
L3
(I
C
),
Disable:
Map Pickup LED:
Logical operation of the harmonic blocking can be tested by injection of 5
th
harmonic current (at 250Hz for 50Hz
relay) to cause operation of the blocking signals. Note that injection of any level of 5th harmonic alone on a
current input will cause the block to be raised since the harmonic content on this input is 100%, i.e. greater than
setting.
Fundamental frequency current can be injected into the other winding simultaneously to operate the 87BD or
87HS protection elements if required to test the blocking operation. Care should be taken that the thermal limits of
the relay are not exceeded during these tests.
More advanced test equipment is required, with the facility to combine harmonic and fundamental frequencies of
current, to test the level of the blocking element. Note that the 81HBL5 Setting is set as a fraction of the total
current. e.g. 0.25A at 250Hz combined with 1A at 50Hz gives a 5th harmonic content of 0.2 i.e. (0.25/(0.25+1.0)).