ABB REQ650 - Page 54

145
3 3
3
2.6 85
2 2 10 2.5 17.5
ph
sc
sc line
U
I kA
Z Z j j
= × = × = Ð °
+ + +
EQUATION2342 V1 EN
3
3
1
REQ650 (A01)
Z
SC
: High
Ph – ph short circuit
IEC10000147-1-en.vsd
IEC10000147 V1 EN
Figure 13: Fault for step 1 setting
In case of a three-phase short circuit in zone 1 reach in the shortest line from the remote
busbar as shown in figure 14, the current to the protection is I = 1.5 kA.
Section 3 1MRK 505 291-UEN A
REQ650 setting examples
48
Application manual