Protection
Function
Protection
Function
Tele-
Protection
Equipment
Tele-
Protection
Equipment
Tele-
communication
System
CS from the
protection
function, operate
and reset time
CS initiation to
the
communication
system, operate
and reset time
CS propagation,
propagation
CR selection and
decision, operate
and reset time
CR to the
protection
function, operate
and reset time
Time
Fault
occurs
Protection
pick-up
CS initiation
CR to
teleprot.
eq.
CR to
prot.
func
Fault current
reversal
Sending
protection
reset
CS to
communication
drop
CR
reception
drop
CR to
prot.
func
drop
Minimum setting of tDelay
IEC05000536-2-en.vsd
IEC05000536 V2 EN-US
Figure 179: Time sequence of signaling at current reversal
14.5.3.2 Weak-end infeed
M13933-12 v6
The weak-end infeed can be set by setting the parameter
WEI
to
Off
,
Echo
or
Echo & Trip
.
Operating zero sequence voltage when parameter
WEI
is set to
Echo & Trip
is set with 3U0>.
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 (3U0) 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.
1MRK 511 358-UEN A Section 14
Scheme communication
355
Application manual
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