Siemens Argus 7SR21 Technical Manual page 591

3.1 Over Fluxing Detector. (81HBL5)
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:
Logical operation of the harmonic blocking can be tested by injection of 5
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)).
© 2013 Siemens Protection Devices Limited
37 50
49
(x2) BF
)
37 50
49
(x2) BF
)
37 50
49
(x2) BF
)
46
46 60
NPS
BC CTS
(x2)
)
)
functions are mutually exclusive
27
59
(x4)
27
47
59
(x2)
(x4)
27
59
(x4)
27
59
Optional
79
Figure 3.1-1
n/a
I (I ), I (I ), I
L1 A L2 B L3
7SR210 & 7SR220 Commissioning & Maintenance Guide
67/ 67/
51V 50 51
(x4) (x4)
67/ 67/
51V 50 51
(x4) (x4)
67/ 67/
51V 50 51
(x4) (x4)
60 67/ 67/
60
CTS- 50N 51N
VTS
I (x4) (x4)
67/ 67/ 81
50G 51G HBL
(x4) (x4) 2G
67/ 67/
64
50S 51S
H
(x4) (x4)
NOTE: The use of some
Note:
Example shows
81
Voltage Config =
(x6)
Van, Vbn, Vcn
59N 74
(x2) TCS
Magnetising Inrush Detector
(I ),
C
th
harmonic current (at 250Hz for 50Hz
7SR22
81
HBL 51c
5
81
HBL 51c
5
81
HBL 51c
5
81
HBL
2N
37G
(x2)
37S
(x2)
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