ABB REL670 2.2 IEC - Setting Guidelines

DTT scheme comprises following local criteria checks as shown in Figure 379.
C
B
T
r
i
p
o
u
t
p
u
t
Low impedance protection
Sudden change in current
variation
Zero sequence overcurrent
protection
Negative sequence overcurrent
protection
Zero sequence overvoltage
protection
Negative sequence overvoltage
protection
Compensated over and
undervoltage protection
Three phase undercurrent
Three phase overcurrent
Backup trip of breaker failure
protection
OR
Low active power and power
factor protection
A
n
a
l
o
g
i
n
p
u
t
U3P
I3P
IEC09000773-1-en.vsd
LocalCheck
CR1
CR2
CR1
CR2
Impedance protection
Breaker Failure
LCCRPTRC
CarrierReceiveLogic
IEC09000773 V1 EN-US
Figure 379: DTT scheme
16.8.2 Setting guidelines
GUID-9E9CD5E0-1556-4E56-8A5D-5ACC17DAA00F v2
Setting guidelines for Direct transfer trip functions are outlined in the following
sections.
16.8.3 Low active power and power factor protection LAPPGAPC
GUID-585236C8-583C-4415-9820-A1DD038EA995 v1
Section 16 1MRK 506 369-UEN B
Scheme communication
728 Line distance protection REL670 2.2 IEC
Application manual