Rev.17
42/119
If overcurrent fault is 11xI
n
=1100 Ap, IEC inverse curve defines a tripping value of 0.1425s
(Figure1) for 50/51 function. It is considered that this time is too high, so when current fault
reaches 11xI
n
, definite time overcurrent function will be work.
The figure below (Figure 2), shows the tripping curve of the relay:
Figure 2. Relay tripping curve
APPLICATION EXAMPLE 2
Starting from the following information:
Line details:
•
Transformation ratio of CT =500/1
•
Primary current: I
p
=500 A
50/51 function settings
•
Curve type: IEEE Extremely Inverse
•
Dial: 2.20
•
Tap: 1xI
n
50 function settings
•
Tap: 14xI
n
•
Operating time: 0.1 s
Summary of Contents for SIA-F
Page 7: ...www fanox com Rev 17 7 119 2 DIMENSIONS AND CONNECTION DIAGRAMS 2 1 Frontal view...
Page 8: ...www fanox com Rev 17 8 119 2 2 Case dimensions The dimensions are in mm CUT OUT PATTERN...
Page 9: ...www fanox com Rev 17 9 119 2 3 Connection diagram 3 Phase CT and neutral CT Connection...
Page 10: ...www fanox com Rev 17 10 119 3 Phase CT and residual neutral Connection...
Page 34: ...www fanox com Rev 17 34 119...
Page 35: ...www fanox com Rev 17 35 119...
Page 36: ...www fanox com Rev 17 36 119...
Page 118: ...www fanox com Rev 17 118 119 NOTES...
Page 119: ...www fanox com Rev 17 119 119...
