![background image](http://html1.mh-extra.com/html/abb/rec650-ansi/rec650-ansi_applications-manual_3390438052.webp)
IEC09000451 V1 EN
Figure 7:
Inverse time operation characteristics for selectivity
3.1.5
Calculating settings for four step phase overcurrent protection
3-phase output, LV-side OC4PTOC (51_67)
The 22 kV phase overcurrent protection has the following purpose:
•
Main protection for short circuits on 22 kV busbar
•
Backup protection for short circuits on outgoing 22 kV feeders (if possible)
The reach of the phase overcurrent line protection is dependent on the operation state and
the fault type. Therefore the setting must be based on fault calculations made for different
Section 3
1MRK 511 286-UUS A
REC650 setting examples
46
Application manual
Summary of Contents for REC650 ANSI
Page 1: ...Relion 650 series Bay control REC650 ANSI Application manual...
Page 2: ......
Page 26: ...20...
Page 66: ...Section 3 1MRK 511 286 UUS A REC650 setting examples 60 Application manual...
Page 71: ...IED IED ANSI05000460 V2 EN 1MRK 511 286 UUS A Section 4 Analog inputs 65 Application manual...
Page 82: ...76...
Page 92: ...86...
Page 170: ...164...
Page 176: ...170...
Page 274: ...268...
Page 288: ...282...
Page 350: ...344...
Page 369: ...363...