3.3 Commissioning
511
7SD5 Manual
C53000-G1176-C169-1
This test must be performed at both line ends, on a three terminal line at each line end
for each transmission path. However, please finally observe the last margin heading
„Important for all procedures“!
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.
3.3.12 Testing the Signal Transmission with Earth Fault Protection
This section is only relevant if the device is connected to a earthed system and earth
fault protection is applied. The device must therefore be provided with the earth fault
detection 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 Earth Fault O/C (address 131). Furthermore, the teleprotection
must be used for the earth fault protection (address 132 Teleprot. E/F configured
to one of the optional methods). If none of this is the case, this section is not relevant.
If the signal transmission path for the earth fault protection is the same path that was
already tested in conjunction with the distance protection according to the previous
Section, then this Section is of no consequence and may be omitted.
For the functional check of the earth fault protection signal transmission, the distance
protection should be disabled, to avoid interference of the tests by signals from the dis-
tance protection: address 1501 FCT Distance = OFF.
Checking with Per-
missive Schemes
Requirements: Teleprot. E/F is configured in address 132 to one of the compari-
son schemes using permissive signal, i.e. Dir.Comp.Pickup or UNBLOCKING. Fur-
thermore, FCT Telep. E/F is switched ON at address 3201. Naturally, the corre-
sponding send and receive signals must also be assigned to the corresponding binary
output and input. For the echo function, the echo signal must be assigned separately
to the transmit output.
Detailed information on the function of permissive release is available in Section 2.9.
A simple check of the signal transmission path from one line end is possible via the
echo circuit if these release techniques are used. The echo function must be activated
at both line ends, i.e. address 2501 FCT Weak Infeed = ECHO only; with the
setting ECHO and TRIP at the remote end of the check a tripping command may
result!
An earth fault is simulated in the direction of the line. This may be done with secondary
injection test equipment. As the device at the opposite line end does not pick up, the
echo function comes into effect there, and consequently a trip command is issued at
the line end being tested.
If no trip command appears, the signal transmission path must be checked again, es-
pecially also the assignment of the echo signals to the transmit outputs.
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 must also be tested at this time if this has not already been done in the previous
section (the operation of the protection at the opposite line end
is checked):
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