Section 3 REQ650 setting examples
3.1 Setting example for a line bay with backup protection
unit REQ650 A01
The application example has a 145 kV line bay with backup protection unit REQ650
A01. The main protection of the line is a distance protection unit, not covered in this
setting example.
3
3
1
REQ650 (A01)
Line/Feeder
Solidly Earthed System
IEC10000146-1-en.vsd
IEC10000146 V1 EN
Figure 12: Line bay backup protection application
The following data is assumed:
Table 10: Typical data for the line bay
Item
Data
Line length 50 km
Positive sequence impedance 0.05 + j 0.35 ohm/km => 2.5 + j17.5 ohm
Zero sequence impedance 0.15 + j 1.00 ohm/km => 7.5 + j50 ohm
High positive sequence source
impedance
j10 ohm (about 1900 MVA)
Table continues on next page
1MRK 505 291-UEN A Section 3
REQ650 setting examples
43
Application manual
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