ABB Relion 670 Series Applications Manual page 402

Section 14
Scheme communication
Protection
Function
CS from the
protection
function, operate
and reset time
Fault Protection
occurs pick-up
IEC05000536 V2 EN-US
Figure 192: Time sequence of signaling at current reversal
14.5.3.2 Weak-end infeed
The weak-end infeed can be set by setting the parameter
Operating zero sequence voltage when parameter
The zero sequence voltage for a fault at the remote line end and appropriate fault resistance is
calculated.
To avoid unwanted trip from the weak-end infeed logic (if spurious signals should occur), set the
operate value of the broken delta voltage level detector (3V0) higher than the maximum false
network frequency residual voltage that can occur during normal service conditions. The
recommended minimum setting is two times the false zero-sequence voltage during normal
service conditions.
396
Tele-
Protection
Equipment
CS initiation to
the
communication
system, operate
and reset time
protection
CR to CR to
teleprot. prot.
Fault current
CS initiation eq. func
reversal
Tele- Tele-
communication Protection
System Equipment
CR selection and
CS propagation,
decision, operate
propagation
and reset time
Sending CR
reception
reset drop
CR to
CS to
prot.
communication
func
drop
drop
Minimum setting of tDelay
WEI to Off , Echo or Echo & Trip .
WEI is set to Echo & Trip is set with 3V0PU.
1MRK 511 358-UUS A
Protection
Function
CR to the
protection
function, operate
and reset time
Time
IEC05000536-2-en.vsd
M13933-12 v6
Application manual