Installation and Commissioning
8-36
7SA522 Manual
C53000-G1176-C119-2
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
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 5.2.4).
The circuit breaker must be 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 trans-
mission path.
Blocking Scheme
7HOHSURWHFWLRQIRU(DUWKIDXOWRYHUFXUU7HOHSURW
in address
(Section 5.1) is set to a comparison scheme with a blocking
signal, i.e.
%ORFNLQJ
; furthermore the setting in address
must be
21
. Naturally the corresponding send and receive signals must also be assigned
to the corresponding binary output and input.
In the case of the blocking scheme, communication between the line ends is neces-
sary.
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 may 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 (
, address
). If applicable, the
transient blocking time of the receiving line end (
, address
)
appears additionally if a finite delay time
(address
) 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 direction.
Important for all
Schemes
If the distance protection was disabled for the signal transmission tests, it may be re-
enabled 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 re-
set to the prescribed values.
8.3.6.3
Signal Transmission for the Overvoltage Protection
The overvoltage protection provides the option of also tripping the opposite line end in
the case of an overvoltage if a signal transmission path is available for this purpose. If
this signal transmission channel is shared with the distance protection and/ or the
earth fault protection, and has already been checked according to Sub-section 8.3.6.1
or 8.3.6.2, then this Sub-section 8.3.6.3 is of no interest and may be omitted.
Otherwise, the following prerequisites apply:
2YHUYROWDJH
in address
(section
5.1) must be configured as
(QDEOHG
. Furthermore, the setting in address
Содержание siprotec 7SA522
Страница 20: ...7SA522 Manual C53000 G1176 C119 2 ...
Страница 64: ...7SA522 Manual C53000 G1176 C119 2 ...
Страница 89: ...SIPROTEC 4 Devices 4 25 7SA522 Manual C53000 G1176 C119 2 Figure 4 20 CFC Logic example ...
Страница 408: ...7SA522 Manual C53000 G1176 C119 2 ...
Страница 456: ...7SA522 Manual C53000 G1176 C119 2 ...
Страница 516: ...7SA522 Manual C53000 G1176 C119 2 ...
Страница 620: ...Appendix B 48 ...