2.3.5 Line bay in a high impedance earthed network, connected to
double busbar switchyard
3
3
1
REQ650 (A01)/(B11)
1
Bus 1
Bus 2
Line/Feeder
IEC10000137-1-en.vsd
IEC10000137 V1 EN
Figure 8: Line bay in a high impedance earthed network
REQ650 has a number of back-up protection functions. In addition to this, three-phase
trip and autoreclosing is available for REQ650 A01 and single-phase trip and
autoreclosing is available for REQ650 B11.
2.3.6 Functionality table
The proposal for functionality choice for the different application cases are shown in
table
5.
The recommendations have the following meaning:
• On: It is recommended to have the function activated in the application.
• Off: It is recommended to have the function deactivated in the application.
• Application dependent: The decision to have the function activated or not is
dependent on the specific conditions in each case.
Applications 1 — 4 in table
5 are according to application examples
given in previous sections.
1MRK 505 291-UEN A Section 2
Application
35
Application manual
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