IPC402x-UM-2209-1-2.x.x (en)
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1 RESET
–
The detector will temporarily and as short as possible be in this state for the return to IDLE to be
controlled.
Similar states also exist for overcurrent, non-directional earth fault and phase interruption. Only the
overcurrent detection states for stage 1 are displayed in the transient fault recording:
0 IDLE
2 START
4 DETECT/TRIP
The
State
signal in the transient fault recording file contains information on the state of both earth fault
and overcurrent. The state signal is an 8-bit value where the lower nibble indicates the state of the earth
fault detector and the upper one indicates the state of overcurrent one. For example, the value 34 decimals
(22 hexadecimal) means that ground fault has state 2-TRIG and overcurrent 2-START.
8.2.1 Evaluation of Earth Faults
See the example below showing a solid earth fault and the corresponding state changes during the
evaluation process.
Figure 8.
States during the evaluation of a solid earth fault.
-1,5
-1
-0,5
0
0,5
1
1,5
2
2,5
Earth Fault
L1
L2
L3
In
0
2
4
6
8
1
14
27
40
53
66
79
92
105
118
131
144
157
170
183
196
209
222
235
248
261
274
287
300
313
326
339
352
365
378
391
404
417
430
443
456
469
482
495
State
Time delay
