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4.19 Function SHB. Second Harmonic Blocking
This protection function can be set by using the following parameters:
Group
Description
Minimum
Maximum
Step
Unit
Default
SHB
Second harmonic blocking
Function Enable
-
-
Yes/No
-
No
Current tap
5
50
1
%
20
Reset time
0.000
300.000
0.001
s
0.200
Block Threshold
0.010
30.000
0.001
xIn
7.000
The second harmonic blocking is used to avoid an undesirable behavior due to inrush current when
energizing a machine like a transformer or a generator.
In order to avoid these undesirable trips, if the second harmonic percentage is higher than the pre-set
value, the trip will be blocked during the time set in reset time parameter.
The function picks-up at 100% off the adjusted input and the dropout is at 95%. The reset type will
depend on the adjusted reset time.
There is also a 2
nd
harmonic blocking threshold. This setting allows to block this function if the
fundamental current exceeds the value specified in the setting.
The SHB will only be applied in functions that have this feature. When the Function Enable of these
protection functions is set to
‘
SHB
’
, the second harmonic blocking will supervise the protection function.
4.20 Function 68. Zone selection interlocking (ZSI)
The relay is provided with configurable outputs, inputs and logic signals which can be used to implement
zone selection interlocking feature.
Configuration:
FEEDER RELAY
Output 1: pickup of function 50 or 51
Output 2: pickup of function 50N/50G or 51N/51G
SUPPLY RELAY
Input 1: block the trip of phase overcurrent functions
Input 2: block the trip of neutral overcurrent functions
Relays with feeder functionality must activate the output 1 when detect the pickup of function 50 or 51
and must activate the output 2 when detect the startup of function 50N/50G or 51N/51G.
Relays with supply functionality, block the trip of functions 50 and 51 when detect the activation of input
1 and block the trip of functions 50N/50G and 51N/51G when detect the activation of input 2.
Summary of Contents for SIL-A A Series
Page 8: ...www fanox com Rev 04 8 112 2 1 2 Case dimensions The dimensions are in mm...
Page 9: ...www fanox com Rev 04 9 112 2 1 3 Connection diagrams 2 1 3 1 Analog connections...
Page 12: ...www fanox com Rev 04 12 112 2 2 SILA with short circuitable current terminals 2 2 1 Front view...
Page 13: ...www fanox com Rev 04 13 112 2 2 2 Case dimensions The dimensions are in mm...
Page 14: ...www fanox com Rev 04 14 112 2 2 3 Connection diagrams 2 2 3 1 Analogic connections...
Page 22: ...www fanox com Rev 04 22 112 3 3 Functional diagram...
Page 61: ...www fanox com Rev 04 61 112...
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Page 111: ...www fanox com Rev 04 111 112 11 APPENDIX NOTES...
