3 Mounting and Commissioning
488
7SD5 Manual
C53000-G1176-C169-1
Finally, there should not be any more fault messages of the protection data interfaces.
Availability of the
Protection Data
Interfaces
The quality of protection data transmission depends on the availability of the protec-
tion data interfaces and the transmission. Therefore, check the statistic information of
the device.
Check the following information:
• Message No. 7753 „PI1A/m“ (availability per minute) and message No. 7754
„PI1A/h“ (availability per hour) indicate the availability of protection data interface
1. The value of No. 7753 „PI1A/m“ should attain a minimum availability of 99.85%
after two minutes of operation. The value of No. 7754 „PI1A/h“ should attain a
minimum availability of 99.85% after one hour of operation.
• If protection data interface 2 is used, the corresponding messages can be found
under No. 7755 „PI2A/m“ and No. 7756 „PI2A/h“; the minimum values are the
same as for protection data interface 1.
If the values are not attained, the protection communication must be checked.
If GPS synchronization is used, the transmission times can be retrieved separately for
each direction:
• Concerning protection data interface 1, No. 7876 „PI1 TD S“ indicates the trans-
mission time in sending direction, No. 7875 „PI1 TD R“ in receiving direction.
• Concerning protection data interface 2, No. 7878 „PI2 TD S“ indicates the trans-
mission time in sending direction, No. 7877 „PI2 TD R“ in receiving direction.
In all other cases, the mean value for both directions will be indicated:
• No. 7751 „PI1 TD“ indicates the transmission time via protection data interface 1.
• No. 7752 „PI2 TD“ indicates the transmission time via protection data interface 2.
Checking Further
Links
If more than two devices have been linked, that is if the object to be protected has
more than two ends, or, if two devices have been linked via both protection data inter-
faces to create redundancy, repeat all checks for every possible link as described
above including the consistency check.
If all devices involved in the topology communicate properly and all parameters are
consistent, the message No. 3464 „Topol complete“ appears.
If there is a ring topology, the message No. 3457 „Ringtopology“" must also
appear after closing the ring.
However, if you've got a ring topology which only issues the indication
„Ringtopology“ instead of „Chaintopology“ (No. 3458), the protection data
communication is functional, but the ring has not yet been closed. Check the missing
links as described above including the consistency test until all links to the ring have
been made.
3235 „Par. different“ ON „Parameterization inconsistent“: different functional pa-
rameters were set for the devices. They have to be equal
at both ends:
Differential protection available or not (see Section 2.1.1)
Transformer in protected zone or not (see Section 2.1.1)
Nominal frequency (see Section 2.1.2)
Operational power or current (see Section 2.1.4)
3487 „Equal IDs“ ON „Same device address“: the same parameter 4710
LOCAL RELAY has been set for more than one device.
No. Short Text State Meaning / Measures
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