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3 Mounting and Commissioning
Table 3-15
Availability of the
The quality of protection data transmission depends on the availability of the protec-
protection data in-
tion data interfaces and the transmission. Therefore, check the statistic information of
terfaces
the device.
Check the following information:
• Indication No. 7753 „PI1A/m" (availability per minute) and indication No. 7754
If these values are not attained, the protection communication should be checked.
If GPS synchronisation is used, the transmission times can be retrieved separately for
each direction:
• Concerning protection data interface 1, indication No. 7876 „PI1 TD S" indicates
In all other cases, the mean value for both directions will be indicated:
• Indication No. 7751 „PI1 TD" indicates the transmission time for protection data
WEB-Monitor
The topology and the statistics of the protection data interfaces can be graphically dis-
played on the screen using the WEB-Monitor. This requires a personal computer with
web browser. Figure 3-21 shows the general information of the communication topol-
ogy.
302
Annunciations on inconsistencies
No
Short Text
3233 „DT
ON
inconsistent"
3234 „DT unequal"
ON
3235 „Par. different"
ON
3487 „Equal IDs"
ON
„PI1A/h" (availability per hour) indicate the availability of protection data interface
1. The value of No. 7753 „PI1A/m" should attain a minimum per-minute-availabil-
ity of 99.85% after two minutes of operation. The value for No. 7754 „PI1A/h"
should attain a minimum per-hour-availability of 99.85 % after one hour of opera-
tion.
the transmission time in sending direction, No. 7875 „PI1 TD R" in receiving di-
rection.
interface 1.
State
Meaning / Measures
„Device table inconsistent": the indexing of the devices is
inconsistent (missing numbers or one number used
twice, see Section 2.2.3.1)
„Device table unequal": the ID-numbers of the devices
are unequal (see Section 2.2.3.1 )
„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)
„Same device address:": The parameter 4710 LOCAL
RELAY has been set for several devices.
7SD610 Manual
C53000-G1176-C145-4
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