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Section 17
Station communication
local
IED
MU
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.
local
IED
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
Function description
Accidental energizing
protection for
synchronous generator
Broken conductor check
Capacitor bank
protection
Pole discordance
protection
Breaker failure
protection
Breaker failure
protection, single phase
version
Table continues on next page
400
Direct transfer trip (DTT)
Not OK
OK
Direct transfer trip (DTT)
Not OK
Not OK
are connected to specific MUs
IEC 61850 identification
AEGPVOC
BRCPTOC
CBPGAPC
CCPDSC
CCRBRF
CCSRBRF
remote
IED
IEC13000299-2-en.vsd
remote
IED
MU
IEC13000300-2-en.vsd
Function description
Two step overvoltage
protection
Four step single phase
overcurrent protection
Radial feeder protection
Instantaneous phase
overcurrent protection
PoleSlip/Out-of-step
protection
Restricted earth fault
protection, low
impedance
1MRK 505 370-UEN D
IEC 61850 identification
OV2PTOV
PH4SPTOC
PAPGAPC
PHPIOC
PSPPPAM
REFPDIF
Busbar protection REB670
Application manual
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