ABB REC650 - Bus Coupler in a Solidly Grounded Network

Function Application 1 Application 2
Directional over-power protection GOPPDOP
(32)
Application dependent Application dependent
Negative sequence based overcurrent
protection DNSPTOC (46)
Application dependent Application dependent
Two step undervoltage protection UV2PTUV
(27)
Application dependent Application dependent
Two step overvoltage protection OV2PTOV
(59)
Application dependent Application dependent
Two step residual overvoltage protection
ROV2PTOV (59N)
Disabled Enabled
Under frequency protection SAPTUF (81)
(instance 1)
Application dependent Application dependent
Under frequency protection SAPTUF (81)
(instance 2)
Application dependent Application dependent
Over frequency protection SAPTOF (81)
(instance 1)
Application dependent Application dependent
Over frequency protection SAPTOF (81)
(instance 2)
Application dependent Application dependent
Rate-of-change of frequency protection
SAPFRC (81) (instance 1)
Application dependent Application dependent
Rate-of-change of frequency protection
SAPFRC (81) (instance 2)
Application dependent Application dependent
Current circuit supervision CCSRDIF (87) Enabled Enabled
Fuse failure supervision SDDRFUF Enabled Enabled
Breaker close/trip circuit monitoring
TCSSCBR
Enabled Enabled
Synchrocheck, energizing check, and
synchronizing SESRSYN (25)
Application dependent Application dependent
Autorecloser SMBRREC (79) Enabled Enabled
2.3.4 Bus coupler in a solidly grounded network
Normally the following fault scenarios require back-up protection functions:
• Short circuits on one of the busbar sections and short circuits on outgoing lines. For
these faults the four step phase overcurrent protection should be used. The four step
phase overcurrent protection has the possibility of directional function as well as
different time delay characteristics. It is important to base the setting on fault
calculations considering different operational states as well as time delay
coordination with other protections in the system.
• Phase-to-ground faults one of the busbar sections and phase-to-ground faults on
outgoing lines. For these faults the four step residual overcurrent protection should be
used. The four step residual overcurrent protection has the possibility of directional
1MRK 511 286-UUS A Section 2
Application
35
Application manual