Siemens SIPROTEC 7SD610 Manual page 60

Functions
2.2 Protection Data Interfaces and Protection Data Topology
If transmission time jumps exceeding the parameterized value of the maximum transmission time difference
(address 4506) occur in the communication networks, a proper function of the differential protection for high-
current faults outside the zone to be protected is not guaranteed. The device is able to record transmission
time jumps. At address 4515 PI1 BLOCK UNSYM (default YES), you can define whether the protection data
interface connection for the differential protection shall be blocked in this case. The protection data interface
can be unblocked by means of the message 3256 „PI1 unsym." or via the binary input 3252 „>SYNC PI1
RESET". The message 3256 is pre-allocated in DIGSI in the control menu. The unblocking may only be effect-
ed if the transmission times are symmetrical.
The following table provides setting hints for the parameters 4506 and 4515 when using different communica-
tion media or communication converters:
Table 2-2
Communication medium
Communication
Converter
Direct FO
(no converter)
Communication network
/communication converter
KU-XG (7XV5662–0AA00)
Communication network /
communication
converter KU-KU
(7XV5662–0AC00)
Communication network /
communication converter
(KU-2M (7XV5662–
0AD00)
Communication network
IEEE C37.94, FO30
module
Direct FO-FO converter
(7XV5461–0Bx00
1)
Average value (adjust if necessary)
2)
If the maximum possible transmission time difference in address 4506 or is parameterised, address 4515
or can be set to NO.
If GPS synchronisation is used (order option), the preset value for the maximum transmission time difference
is only effective with certain restrictions. Address 4511 PI1 SYNCMODE defines the precondition for the acti-
vation of the differential protection after re-establishing the communication connection (establishing or re-es-
tablishing after a communication failure).
PI1 SYNCMODE = GPS SYNC OFF means that no GPS synchronisation is available at this protection data in-
terface. This makes sense if no runtime differences are expected (e.g. fibre optic connection). The value pa-
rameterized at address 4506 PROT 1 UNSYM. is considered by the differential protection when calculating the
restraint current.
PI1 SYNCMODE = TEL and GPS means that the differential protection is only released if the communication
line has been synchronized via GPS (both stations must be able to receive GPS signals) or if symmetrical trans-
mission times are signalled via an external operation (binary input). If the operator initiates the synchronisation,
the differential protection uses the value set at address 4506 PROT 1 UNSYM. until the transmission time dif-
ference has been calculated by the GPS synchronisation.
60
Parameters of the protection data interface
Supported
Interface
Direct FO
G0.703 - 64 kbit/s
X.21 - 64 kBit/s
X.21 - 64 kBit/s
X.21 - 64 kBit/s
Pilot wire
twisted and
shielded
G703 - T1
(1544 MBit/s)
G703 - E1
(2048 MBit/s)
IEEE C37.94
1, 2, 4, 8 time slots
Direct FO
Protection data interface parameters
4502 CONNEC. 1 4506 PROT 1
OVER UNSYM.
F.optic direct 0.0 ms
Com conv 64 kBit/s 0.250 ms to 0.6 ms
Com conv 64 kBit/s
Com conv 128 kBit/s
Com conv 512 kBit/s
Com conv 128 kBit/s 0.125 ms
Com conv 512 kBit/s 0.250 ms to 0.6 ms
C37.94 1 slot 0.250 ms to 0.6 ms
C37.94 2 slots
C37.94 4 slots
C37.94 8 slots
F.optic direct 0.0 ms
C53000-G1176-C145-6, Release date 02.2011
4515 PI1
BLOCK UNSYM
NO
1) 2)
YES
NO
1) 2)
YES
1) 2)
YES
NO
SIPROTEC, 7SD610, Manual