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
19, at the busbar and high source impedance
from the remote line end results in the following fault current to the protection:
EQUATION2349 V1 EN
1MRK 505 291-UEN A Section 3
REQ650 setting examples
55
Application manual
To Next Page
Loading...
Need help?
General
