2 Functions
82
7SD5 Manual
C53000-G1176-C169-1
Address 4511 PI1 SYNCMODE is only relevant if GPS synchronization (ordering
option) is used. It determines the conditions for operation when the protection data
communication has been re-established (initially or after transmission failure).
• PI1 SYNCMODE = TEL or GPS means that the differential protection will become
active as soon as the protection communication has been established (data tele-
grams are received). Until the GPS synchronization is put into service with the con-
ventional method, the differential protection operates with increased self-restraint
determined by the maximum transmission time difference without GPS (address
4506 PROT 1 UNSYM.).
• PI1 SYNCMODE = TEL and GPS means that the differential protection is active,
after reception of proper protection data telegrams, first when GPS synchronization
has taken place or if the running time is signalled via an external operation (binary
input). If synchronization is established by the operator, the differential protection
operates with the configured value under address 4506 PROT 1 UNSYM. since
transmission time differences are compensated by the GPS synchronization.
• PI1 SYNCMODE = GPS SYNC OFF means that no GPS synchronization takes place
for this protection data interface. This is meaningful if no transmission time differ-
ences are expected (e.g. for fibre-optic direct data link).
You can determine a limit value PROT1 max ERROR for the permissible rate of faulty
protection data telegrams under address 4513. This parameter can only be altered
with DIGSI
®
under Additional Settings. The preset value 1 % means that one faulty
telegram per 100 telegrams is permissible. The sum of telegrams in both directions is
decisive.
If frequent transmission time jumps occur the regular operation of the differential pro-
tection is endangered. Under address 4515 PI1 BLOCK UNSYM you can decide
whether the differential protection shall be blocked in this case. Normal setting is YES
(default). If a ring topology is configured, the system switches to chain topology. If a
chain topology was configured, failure of one transmission link blocks the differential
protection. This parameter can only be altered with DIGSI
®
under Additional Set-
tings.
Protection Data
Interface 2
If protection data interface 2 exists and is used, the same possibilities apply as for pro-
tection data interface 1. The corresponding parameters are set under addresses 4601
STATE PROT I 2 (ON or OFF), 4602 CONNEC. 2 OVER, 4605 PROT 2 T-DELAY
and 4606 PROT 2 UNSYM. here again, the two last parameters can only be set with
DIGSI
®
under Additional Setting. If GPS synchronization is available, the parameter
is to be used under the address 4611PI2 SYNCMODE. The maximum permissible rate
of faulty protection data telegrams PROT2 max ERROR (address 4613) and the reac-
tion to impermissible transmission time difference PI2 BLOCK UNSYM (address
4615) (blocking of the differential protection YES or NO) can also be changed under
Additional Settings.
GPS Synchroniza-
tion (optional)
If GPS synchronization (order option) is used, this synchronization mode can be
switched ON or OFF in address 4801 GPS-SYNC..
Address 4803 TD GPS FAILD is used to set the delay time after which an alarm is
output „GPS loss“ (No 3247) after a GPS failure is detected.
Further parameters concerning GPS synchronization were set for the individual pro-
tection data interfaces (see above).
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