3
3
1
REQ650 (A01)
Z
SC
: Low
Phase-earth fault
Line protection zone 1 reach
IEC10000152-1-en.vsd
IEC10000152 V1 EN
Figure 18:
Fault for step 1 setting
Proposed current setting is therefore 1200 A.
1.
Set
DirMode1
to
Forward
.
2.
Set
Characterist1
to
IEC Def. Time
.
For the time delay characteristic, definite time is used in this network.
3.
Set
IN1>
to
120%
of
IBase
(1200 A primary current).
4.
Set
t1
to
0.4 s
.
3.1.7.3
Calculating settings for step 2
The protection shall be able to detect all short circuits in the own busbar. A single
phase-to-earth fault, as shown in figure
, at the busbar and high source impedance
from the remote line end results in the following fault current to the protection:
0
3
1.3
87
I
kA
=
Ð - °
EQUATION2349 V1 EN
1MRK 505 291-UEN A
Section 3
REQ650 setting examples
55
Application manual
Summary of Contents for Relion REQ650
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