IEC13000299-2-en.vsd
Direct transfer trip (DTT)
local remote
IEDIED
MU
Not OK
OK
IEC13000299 V2 EN-US
Figure 213: MU failed, mixed system
Case 3:
Failure of one MU (sample lost) blocks the sending and receiving of binary signals through
LDCM.
→DTT from the remote end is not working.
IEC13000300-2-en.vsd
Direct transfer trip (DTT)
local remote
IEDIED
MU
Not OK
Not OK
MU
IEC13000300 V2 EN-US
Figure 214: MU failed, 9-2 system
Table 54: Blocked protection functions if IEC/UCA 61850-9-2LE communication is interrupted and functions
are connected to specific MUs
Function description IEC 61850 identification Function description IEC 61850 identification
Accidental energizing
protection for
synchronous generator
AEGPVOC Two step overvoltage
protection
OV2PTOV
Broken conductor check BRCPTOC Four step single phase
overcurrent protection
PH4SPTOC
Capacitor bank
protection
CBPGAPC Radial feeder protection PAPGAPC
Pole discordance
protection
CCPDSC Instantaneous phase
overcurrent protection
PHPIOC
Breaker failure
protection
CCRBRF PoleSlip/Out-of-step
protection
PSPPPAM
Breaker failure
protection, single phase
version
CCSRBRF Restricted earth fault
protection, low
impedance
REFPDIF
Table continues on next page
Section 17 1MRK 505 370-UEN D
Station communication
400 Busbar protection REB670
Application manual
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