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44, 1736
A
&
45, 1737
DOC3F
B
&
46, 1738
C
&
60, 1752
A
&
61, 1753
DOC3R
B
&
62, 1754
C
&
"FWD"
[DOC3-DIR]
"REV"
+
[DOC3-2F]
+
&
"BLK"
ICD
[DOC3EN]
+
"ON"
1
1542
DOC3 BLOCK
Figure 2.1.37
48, 1740
A
&
49, 1741
DOC4F
B
&
50, 1742
C
&
60, 1756
A
&
61, 1757
DOC4R
B
&
62, 1758
C
&
"FWD"
[DOC4-DIR]
"REV"
+
[DOC4-2F]
+
&
"BLK"
ICD
[DOC4EN]
+
"ON"
1
1543
DOC4 BLOCK
Figure 2.1.38
Directional earth fault protection
Figure 2.1.39 and Figure 2.1.40 show the scheme logic of the directional earth fault protection
DEF1 and DEF2 with selective definite time or inverse time characteristic.
The definite time protection is selected by setting [MDEF1] and [MDEF2] to "DT". Definite time
overcurrent elements are enabled for the DEF1 and DEF2 phase overcurrent protection
respectively, and trip signal DEF1 TRIP and DEF2 TRIP are given through the delayed pick-up
timer TEF1 and TEF2.
The inverse time protection is selected by setting [MDEF1] and [MDEF2] to any one of "IEC",
"IEEE", "US" or "CON" according to the IDMT characteristic to employ. Inverse time
627
≥1
&
628
≥1
&
629
≥1
&
Definite Time Directional Overcurrent Protection DOC3
630
≥1
&
631
≥1
&
632
≥1
&
Definite Time Directional Overcurrent Protection DOC4
⎯
44
TDOC3
0
t
&
t
0
&
t
0
&
0.00 - 300.00s
≥1
&
&
&
3POR
2OUTOF3
TDOC4
t
0
&
0
t
&
0
t
&
0.00 - 300.00s
≥1
3POR
2OUTOF3
⎯
6 F 2 S 0 8 4 2
410
DOC3-A TRIP
411
DOC3-B TRIP
412
DOC3-C TRIP
409
DOC3 TRIP
&
≥1
≥1
&
414
DOC4-A TRIP
415
DOC4-B TRIP
416
DOC4-C TRIP
413
DOC4 TRIP
&
≥1
&
≥1
&
&
&
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