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4.23. Application examples
It is important to know that if both overcurrent protection functions (50 and 51), phase or neutral,
are enable, definite time function (function 50) must be more restrictive. So, if overcurrent fault
values are low, inverse time overcurrent function (function 51) must work, and if overcurrent fault
reaches a certain value, definite time overcurrent function will always work. This is because, when
overcurrent fault reach high values (I>>), it is necessary to be sure that trip is going to be
instantaneous to get that the element we are protecting, does not be damaged.
It is shown somo examples below:
APPLICATION EXAMPLE 1
Starting from the following information:
Line details:
•
Transformation ratio of CT =100/1
•
Primary current: I
p
=100 A
51 function settings
•
Curve type: IEC Inverse
•
Dial: 0.05
•
Tap: 1xI
n
50 function settings
•
Tap: 11xI
n
•
Operating time: 0.05 s
Figure 1. 50 y 51 IEC Inverse
11,0000; 0,1425
0,0000
0,0500
0,1000
0,1500
0,2000
0,2500
0,3000
0,3500
0,0000
10,0000
20,0000
30,0000
40,0000
t
(s)
I
Function 51
Function 50
Содержание SIL B
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Страница 15: ...www fanox com Rev 23 15 311 2 5 Terminals IEC 61850 or DNP3 0 protocols...
Страница 17: ...www fanox com Rev 23 17 311 IEC 60870 5 103 protocol...
Страница 25: ...www fanox com Rev 23 25 311 3 3 Functional diagram...
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Страница 194: ...www fanox com Rev 23 194 311 Polarization V 35 0 V C Operating Angle 180 C Halfcone Angle 3 C...
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Страница 308: ...www fanox com Rev 23 308 311 12 8 LED s configuration LEDs Blinking Latch Negate d LED On LED 1 LED 2 LED 3 LED 4 LED 5...
Страница 310: ...www fanox com Rev 23 310 311 NOTES...
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