Siemens siprotec 7SA6, Руководство пользователя

Страница: 647 / 876

Installation and Commissioning
8-73
7SA6 Manual
C53000-G1176-C156-2
This test must be carried out at both line ends, in the case of three terminal lines at
each end for each signal transmission path.
The functioning of the echo delay time and monitoring of the circuit breaker switching
status should also be tested at this time if this has not already been done under
8.3.13.1 (the operation of the protection at the opposite line end is checked):
The circuit breaker on the protected feeder must be opened, as must be the circuit
breaker at the opposite line end. A fault is again simulated as before. A receive signal
impulse delayed by somewhat more than twice the signal transmission time appears
via the echo function at the opposite line end, and the device issues a trip command.
The circuit breaker at the opposite line end is now closed (while the isolators remain
open). After simulation of the same fault, the receive and trip command appear again.
In this case however, they are additionally delayed by the echo delay time of the de-
vice at the opposite line end (0,04 s presetting, address
2502 Trip/Echo DELAY
).
If the response of the echo delay is opposite to the sequence described here, the op-
erating mode of the corresponding binary input (H–active/L–active) at the opposite line
end must be rectified (see Sub-section 5.2.3).
The circuit breaker is opened again.
This test must also be carried out at both line ends, in the case of three terminal lines
at each line end and for each signal transmission path. Please take note of the last
margin heading “Important for All Schemes”!
Blocking Scheme
Prerequisites:
Teleprotection for Earth fault overcurr. (Teleprot.
E/F)
in address
132
(Section 5.1) is set to a comparison scheme with a blocking sig-
nal, i.e.
Blocking
; furthermore the setting in address
3201
must be
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 information about the blocking scheme see Subsubsection 6.8.1.3. In the
case of the blocking scheme, communication between the line ends is necessary.
An earth fault in the reverse direction is simulated at the transmitting line end. Subse-
quently, a fault at the receiving end in the direction of the line is simulated. This can
be achieved with a set of secondary injection test equipment at each end of the line.
As long as the transmitting end is transmitting, no trip signal must appear at the receiv-
ing line end, except is this is as a result of one of the back up stages with a longer
delay time setting. After the simulated fault at the transmitting line end is switched off,
the receiving line end remains blocked for the duration of the transmit prolongation
time of the transmitting line end (
Send Prolong.
, address
3203A
). If applicable, the
transient blocking time of the receiving line end (
TrBlk BlockTime
, address
3210A
)
appears additionally if a finite delay time
TrBlk Wait Time
(address
3209A
) has
been set and exceeded.
This test must be executed at both line ends, in the case of three terminal lines at each
line end and for each transmission path. Please take note of the last margin heading
“Important for All Schemes”!
Important for All
Schemes If the distance protection was switched off for the signal transmission tests, it may be
switched on now. If setting parameters were changed for the test (e.g. mode of the
echo function or timers for unambiguous observation of sequences), these must now
be reset to the prescribed values.