Functions
2.2 Protection Data Interfaces and Protection Data Topology
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
60
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 Parameters of the protection data interface
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.
Communication medium
Communication
Converter
Supported
Interface
Protection data interface parameters
4502 CONNEC. 1
OVER
4506 PROT 1
UNSYM.
4515 PI1
BLOCK UNSYM
Direct FO
(no converter)
Direct FO F.optic direct 0.0 ms NO
Communication network
/communication converter
KU-XG (7XV5662–0AA00)
G0.703 - 64 kbit/s
X.21 - 64 kBit/s
X.21 - 64 kBit/s
X.21 - 64 kBit/s
Com conv 64 kBit/s
Com conv 64 kBit/s
Com conv 128 kBit/s
Com conv 512 kBit/s
0.250 ms to 0.6 ms
1)
YES
2)
Communication network /
communication
converter KU-KU
(7XV5662–0AC00)
Pilot wire
twisted and
shielded
Com conv 128 kBit/s 0.125 ms NO
Communication network /
communication converter
(KU-2M (7XV5662–
0AD00)
G703 - T1
(1544 MBit/s)
G703 - E1
(2048 MBit/s)
Com conv 512 kBit/s 0.250 ms to 0.6 ms
1)
YES
2)
Communication network
IEEE C37.94, FO30
module
IEEE C37.94
1, 2, 4, 8 time slots
C37.94 1 slot
C37.94 2 slots
C37.94 4 slots
C37.94 8 slots
0.250 ms to 0.6 ms
1)
YES
2)
Direct FO-FO converter
(7XV5461–0Bx00
Direct FO F.optic direct 0.0 ms NO