Siemens siprotec 7SA6, Manual

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Installation and Commissioning
8-71
7SA6 Manual
C53000-G1176-C156-2
echo delay time of the device at the opposite line end (0,04 s presetting, address
2502
Trip/Echo DELAY
).
If the echo delay response is opposite to the above description, the mode of operation
of the corresponding binary inputs (H–active/L–active) at the opposite line end must
be corrected (refer to Sub-section 5.2.3).
The circuit breaker is opened again.
The tests must also be carried out at both line ends, in the case of three terminal lines,
at each end, for each transmission path. Please take note of the last margin heading
“Important for All Schemes”!
Blocking Scheme Prerequisites are:
Teleprotection for Distance prot. (Teleprot.
Dist.)
in address
121
(section 5.1) is set to the overreach transfer with a blocking
signal i.e.
Blocking
; furthermore, the setting in address
2101
must be set to
FCT
Telep. E/F ON
. Naturally, the corresponding send and receive signals must also be
assigned to the corresponding binary output and input.
For more details about the function of the blocking scheme refer to Subsubsection
6.6.1.7. In the case of the blocking scheme, communication between the line ends is
necessary.
On the transmitting end, a fault in the reverse direction is simulated, while at the re-
ceiving end a fault in Z1B but beyond Z1 is simulated. This may be achieved with sec-
ondary injection test equipment at each end. As long as the transmitting end is trans-
mitting, the receiving end may not generate a trip signal, unless this results from a
higher distance stage. After removal of the simulated fault at the transmitting end, the
receiving end remains blocked for the additional duration of the transmit prolongation
time of the transmitting end (
Send Prolong.
, address
2103
). The transient blocking
time of the receiving end (
TrBlk BlockTime
, address
2110
) will additionally appear
if a finite waiting time
TrBlk Wait Time
(address
2109
) was set and if this time had
been exceeded.
In case of a phase-segregated transmission the subsequent checks are carried out for
each phase. The correct phase allocation is also to be checked.
The test must be carried out at both line ends, on a three terminal line at each line end
for each transmission path. Please take note of the last margin heading “Important for
All Schemes”!
Permissive
Underreach
Transfer Prerequisite:
Teleprotection for Distance prot. (Teleprot. Dist.)
in
address
121
(Section 5.1) is set to the permissive underreach transfer trip mode, i.e.
PUTT
or
PUTT (Pickup)
; furthermore the setting in address
2101
must be set to
FCT Telep. E/F ON
. Naturally the corresponding transmit and receive signals must
also be assigned to the corresponding binary output and input.
For more details about the function of the blocking scheme refer to Subsections
6.6.1.1 to 6.6.1.3. Communication between the line ends is necessary.
On the transmitting end, a fault in zone Z1 must be simulated. This can be achieved
with secondary injection test equipment.
Subsequently, on the receiving end in case of permissive underreach transfer
PUTT
a
fault is simulated inside Z1B, but for
PUTT (Pickup)
anywhere outside Z1. Tripping
takes place immediately, (or in T1B), without signal transmission only in a higher dis-
tance stage. In case of direct transfer trip an immediate trip is always executed at the
receiving end.