67
6
F
2
S
0
8
3
4
2.4.5 Overcurrent Backup Protection
Inverse time and definite time overcurrent protections are provided for phase faults and earth
faults respectively.
Scheme logic
The scheme logic of the overcurrent backup protection is shown in Figure 2.4.5.1. The phase
overcurrent protection issues single-phase tripping signals in the operation of OC and OCI, and
can issue a three-phase tripping signal BU-TRIP by PLC signals OC_3PTP and OCI_3PTP. The
default of the phase overcurrent backup protection is a three-phase tripping since both of the PLC
signals OC_3PTP and OCI_3PTP are assigned to “1(=logic level)” (Signal No. =1). The earth
fault protection issues a three-phase tripping signal BU-TRIP in the operation of EF or EFI
element.
OC-A
≥
1
&
0.00 – 10.00s
TOC
t
0
t
0
t
0
"ON"
[OCBT]
+
1
OC_BLOCK
1625
&
&
&
"ON"
[OCIBT]
+
1
OCI_BLOCK
1626
&
&
OC-B_FS
1609
94
95
96
97
98
99
OC_TRIP
326
OC_INST_TP
1703
OC-A_FS
1608
OC-A TP
OC-B TP
OC-C TP
≥
1
≥
1
≥
1
OC_3PTP
1716
&
615
614
613
OC-A TRIP
OC-B TRIP
OC-C TRIP
≥
1
OCI_TRIP
327
OCI-A TP
OCI-B TP
OCI-C TP
≥
1
≥
1
≥
1
OCI_3PTP
1717
&
618
617
616
OCI-A TRIP
OCI-B TRIP
OCI-C TRIP
OC-B
OC-C
OCI-A
OCI-B
OCI-C
OC-B_FS
1609
&
&
&
≥
1
≥
1
≥
1
OCI-B_FS
1613
OCI-A_FS
1612
OCI-B_FS
1614
(M-TRIP)
S-TRIP
S-TRIP
BU-TRIP
≥
1
EF
TEF
t
0
0.00 – 10.00s
&
"ON"
[EFBT]
+
"ON"
[EFBTAL]
+
1
EF_BLOCK
1627
&
EFI
&
"NOD"
[DEFI]
+
1
EFI_BLOCK
1628
60
61
EF_BU-TRIP
EFI_TRIP
EF_ALARM
194
187
185
184
EF_INST_TP
1702
&
≥
1
Figure 2.4.5.1 Overcurrent Backup Protection
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Summary of Contents for GRZ100-211B
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