Permissive Underreach Transfer Trip With Zone Acceleration Z1B (Putt) - Siemens SIPROTEC 7SA6 Manual

Distance protection relay for all voltage levels

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Permissive Underreach Transfer Trip with Zone Acceleration Z1B (PUTT)

C53000-G1176-C156-2

The following procedure is suited for both conventional and digital transmission media.

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

the fault is detected in the pre-set direction inside the zone Z1B. The transmitted signal

may be prolonged by T

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.

Operation scheme of the permissive underreach transfer trip method via Z1B

(settable in address 2103A Send Prolong. ), to compen-