Rev. 07
21/138
4.4.
Function 50/51. Inverse time phase overcurrent
This protection function can be set by using five parameters
:
Function
Description
Minimum
Maximum
Step
Unit
Default
50/51
Inverse time phase overcurrent
Function Enable
-
-
Yes/No/SHB
-
No
Curve type
-
-
(1*)
-
IEC Extremely
Inverse
Time Dial (TMS)
0.01
1.5
0.01
-
1.25
Current Tap
0.07
7.00
0.01
xIn
5.00
Time Delay
0.02
300.00
0.01
s
0.2
(1*) IEC Inverse, IEC Very inverse, IEC Extremely inverse, IEC Long time inverse, Defined time, IEEE
Inverse, IEEE Very inverse, IEEE Extremely inverse
If the option
“Defined time” is selected for the curve setting, the unit behaves like an instantaneous
overcurrent unit. In this case, when the Function Enable
is set to “YES”; the accuracy of the Time Delay
is equal to the pre-set time ±30 ms or ±0.5% (whichever is greater). If the Function Enable is set to
“SHB”, the accuracy of the Time Delay is equal to the pre-set time ±50 ms or ±0.5% (whichever is
greater). In this case, the function is activated at 100% of the set tap value, and it deactivates at 95%.
If a curve (inverse, very inverse or extremely inverse) is selected for the curve setting, the trip time
depends on the curve, time dial and current tap settings. When the Function Enable
is set to “YES”; the
accuracy of the trip time is equal to the theoretical trip time ±30 ms or ±5% (whichever is greater). If the
Function Enable is set to “SHB”, the accuracy of the trip time is equal to the theoretical trip time ±50 ms
or ±5% (whichever is greater). In this case, the function is activated at 110% of the set tap value, and it
deactivates at 100%.
Instantaneous reset in both cases.
The curves used are IEC 60255-151 and IEEE, which are described in their section.
4.5.
Function 50G. Instantaneous neutral overcurrent
This protection function can be set by using three parameters:
Function
Description
Minimum
Maximum
Step
Unit
Default
50G_1
50G_2 (*)
Instantaneous neutral overcurrent
Function Enable
-
-
Yes/No/SHB
-
No
Current Tap
0.05
10.00
0.01
xIn
5.00
Time Delay
0.02
300.00
0.01
s
0.2
(*) Optional depending on model
Содержание SIA-B Series
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Страница 25: ...www fanox com Rev 07 25 138 4 7 4 Thermal protection curves This is the thermal curve for 3 minutes...
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