Rev.01
70/151
8.7 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 once it is below the current tap, the trip will be blocked during the time set in reset time parameter.
The function picks-up at 100% of the adjusted input and the dropout is at 95%. The reset time will
depend on the adjusted reset time setting.
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
Trip
’, the second harmonic blocking will supervise the protection
function. As a result, tolerances for tripping times could be higher than indicated on the functions.
If the time is set from 0.00 to 0.02 seconds the it should apply +/50 ms respect to the setting. If the time
delay setting is higher than 0.02 seconds, the time declared in the manual will apply with or without SHB
permission (+/-35 ms)
8.8 Function CLP. Cold Load Pickup
This protection function can be set by using the following parameters:
Function
Description
Minimum
Maximum
Step
Unit
Default
CLP
Cold Load Pickup
Function Enable
-
-
Yes/No
-
No
Settings group
1
4
1
-
4
No Load time
0.020
300.000
0.001
s
15
Cold Load Time
0.020
300.000
0.001
s
15
This unit is used to prevent undesired operations of the overcurrent functions in the cases where when
the line is de-energized, all the loads enter at the same time.
Summary of Contents for SIL-G
Page 1: ...USER S MANUAL USER S MANUAL SIL G Feeder Relay...
Page 8: ...www fanox com Rev 01 8 151 2 3 Connection diagrams 2 3 1 Analog current connections...
Page 10: ...www fanox com Rev 01 10 151 3 VT configuration phase neutral...
Page 11: ...www fanox com Rev 01 11 151 3 VT configuration phase neutral residual voltage...
Page 12: ...www fanox com Rev 01 12 151 3VT configuration phase phase residual voltage...
Page 13: ...www fanox com Rev 01 13 151 2VT configuration phase phase residual voltage...
Page 14: ...www fanox com Rev 01 14 151 3 VT configuration phase neutral phase B line voltage...
Page 27: ...www fanox com Rev 01 27 151 Dimensions 175x175x150 3 3 Functional diagram...
Page 28: ...www fanox com Rev 01 28 151...
Page 69: ...www fanox com Rev 01 69 151 General trip...
Page 88: ...www fanox com Rev 01 88 151...
Page 89: ...www fanox com Rev 01 89 151...
Page 90: ...www fanox com Rev 01 90 151...
Page 95: ...www fanox com Rev 01 95 151 Time Minutes Seconds Milliseconds...
Page 150: ...www fanox com Rev 01 150 151 NOTES...
Page 151: ...www fanox com Rev 01 151 151...
