3 Mounting and Commissioning
424
7SA522 Manual
C53000-G1176-C155-3
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 can be achieved with a set
of secondary injection test equipment at each end of the line. As long as the transmit-
ting end is transmitting, the receiving end may not generate a trip signal, unless this
results from a higher distance stage. After the simulated fault at the transmitting line
end is switched off, the receiving line end remains blocked for the duration of the trans-
mit prolongation time of the transmitting line end (6HQG3URORQJ, address ).
If applicable, the transient blocking time of the receiving line end (7U%ON%ORFN7LPH,
address ) appears additionally if a finite delay time 7U%ON:DLW7LPH (address
) has been set and exceeded.
In case of a phase-segregated transmission the above-mentioned checks are per-
formed for each phase. The correct phase allocation is also to be checked.
This test must be performed at both line ends, on a three terminal line at each line end
for each transmission path. Finally, please observe the last margin heading “Important
for All Schemes”!
Checking at Per-
missive Under-
reach Transfer
Requirements: 7HOHSURW'LVW is configured in address to a permissive un-
derreach transfer trip scheme, i.e. 3877=%. Furthermore, )&77HOHS'LV is
switched 21 at address . Naturally, the corresponding send and receive signals
must also be assigned to the corresponding binary output and input.
Detailed information on the function of permissive underreach transfer is available in
Subsection 2.6. Communication between the line ends is necessary.
On the transmitting end, a fault in zone Z1 must be simulated. This may be done with
secondary injection test equipment.
Subsequently, on the receiving end at 3877=%, a fault inside Z1B, but outside Z1
is simulated. Tripping takes place immediately, (or in T1B), without signal transmission
only in a higher distance stage. In case of direct transfer trip an immediate trip is
always executed at the receiving end.
In case of a phase-segregated transmission the above-mentioned checks are per-
formed for each phase. The correct phase allocation is also to be checked.
This test must be performed at both line ends, on a three terminal line at each line end
for each transmission path. Finally, please observe the last margin heading “Important
for All Schemes”!
Important for all
Schemes
If the earth fault 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.
3.3.13 Testing of the Signal Transmission with Earth-Fault Protection
This section is only relevant if the device is connected to an earthed system and earth
fault protection is applied. The device must therefore be provided with the earth fault
protection function according to its ordering code (16th MLFB position = 4 or 5 or 6 or
7). Which group of characteristics are to be available must have been preset during
configuration to (DUWK)DXOW2& (address ). Furthermore, the teleprotection
must be used for the earth fault protection (address 7HOHSURW() configured
to one of the optional methods). If none of this is the case, this subsection is not rele-
vant.
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