Rev. 32
36/114
5.4.
50/51N Function. Inverse time calculated neutral overcurrent
This protection function can be set by using the following parameters
:
Function
Description
Minimum
Maximum
Step
Unit
Default
50/51N
Inverse time calculated neutral overcurrent
Function Enable
-
-
Yes/No
-
No
Curve
-
-
(1*)
-
IEC Extremely
Inverse
Time Dial (TMS)
0.05
1.25
0.01
-
1.25
Current Tap
0.20
7.000
0.01
xIn
0,50
Time Delay
0.05
300.00
0.01
s
0.20
(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, the unit Time Delay is adjusted by using the parameter "Time Delay".
If a curve (inverse, very inverse or extremely inverse) is selected for the curve setting, the Time Delay
depends on the curve, Time Dial (TMS) and Current Tap settings.
If the unit operates as defined time, the function is activated at 100% of the set Current Tap value, and
it deactivates at 90%.
If the unit operates with a curve, the function is activated at 110% of the set Current Tap value, and it
deactivates at 100%. The reset is instantaneous in both cases.
The activation time is accurate to ±5% or ±40ms, whichever is higher, of the theoretical activation time.
The curves used are IEC 60255-151 or IEEE, which are described in the "Curves" section.
5.5.
Function TB. Trip block for the switch disconnector
Some transformation centers use a combination of switchgear and fuses for cutting out. As
switchgears have a limited opening current, the fuses are responsible for cutting out the circuit for high
current short circuits. This prevents the switchgear being destroyed if opened in this situation. In order
to deal with these situations, tripping is blocked when the phase current exceeds a pre-set value.
Group
Description
Minimum
Maximum
Step
Unit
Default
Trip block protection for the switchgear
Function Enable
-
-
Yes/No
-
Yes
Current Current
Tap
1.50
20.00
0.01
xIn
7.00
Summary of Contents for SIA-B
Page 9: ...www fanox com Rev 32 9 114 The dimensions are in mm Cut out pattern ...
Page 11: ...www fanox com Rev 32 11 114 Cut out pattern 2 3 Striker dimensions 2 3 1 PRT 15 ...
Page 12: ...www fanox com Rev 32 12 114 2 3 2 PRT A 44 5 B 49 5 C 56 5 D 64 5 E 42 5 ...
Page 19: ...www fanox com Rev 32 19 114 3 3 Functional Diagram ...
Page 24: ...www fanox com Rev 32 24 114 Dimensions ...
Page 27: ...www fanox com Rev 32 27 114 Dimensions Model CT16 5 Model CT08 5 ...
Page 42: ...www fanox com Rev 32 42 114 ...
Page 43: ...www fanox com Rev 32 43 114 ...
Page 44: ...www fanox com Rev 32 44 114 ...
Page 45: ...www fanox com Rev 32 45 114 ...
Page 47: ...www fanox com Rev 32 47 114 ...
Page 48: ...www fanox com Rev 32 48 114 ...
Page 49: ...www fanox com Rev 32 49 114 ...
Page 101: ...www fanox com Rev 32 101 114 Trip Voltage Level 17 Vdc C Nominal current 8 C CT type CT008 ...
Page 113: ...www fanox com Rev 32 113 114 NOTES ...
Page 114: ...www fanox com Rev 32 114 114 ...
