Functions
6-937SA6 Manual
C53000-G1176-C156-2
6.6.1.2 Permissive Underreach Transfer Trip with Zone Acceleration Z1B (PUTT)
The following procedure is suited for both conventional and digital transmission media.
Principle Figure 6-52 shows the operation scheme for this permissive underreach transfer trip
scheme with zone acceleration Z1B. In the case of a fault inside zone Z1, the transfer
trip signal is sent to the opposite line end. The signal received there causes tripping if
thefaultisdetectedinthepre-setdirectioninsidethezoneZ1B.Thetransmittedsignal
may be prolonged by T
S
(settable in address 2103A Send Prolong.), to compen-
sate for possible differences in the pick-up times at the two line ends. The distance
protection is set such that the first zone reaches up to approximately 85 % of the line
length, the overreaching zone however is set to reach beyond the opposite substation
(approximately 120 % of the line length). In the case of three terminal lines, Z1 is also
set to approximately 85 % of the shortest line section but at least beyond the tee off
point. Z1B must securely reach beyond the longer line section, even when additional
infeed is possible via the tee point. For this procedure, transmission via a protection
data interface (if provided) is offered.
In protective relays equipped with a protection data interface, address 121
Teleprot. Dist. allows to set Protection Interface . At address 2101 FCT
Telep. Dis. PUTT
can be set.
Figure 6-52 Operation scheme of the permissive underreach transfer trip method via Z1B
AB
Z1(A)
Z1(B)
Z1B(A)
Z1B(B)
Z1
Z1B
(B)
(B)
T
S
T1
T1B
&
≥1
trip
transm.
rec..
further
zones
Z1
Z1B
(A)
(A)
T
S
T1
T1B
&
≥1
trip
transm.
rec..
further
zones
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