Parameter: Max. Error Rate/min
•
Default setting (_:5161:106) Max. error rate per min = 1.0 %
The Max. error rate per min parameter allows you to receive an error message on the number of faults
per minute. An indication is then generated.
Parameter: Disturbance Alarm After
•
Default setting (_:5161:107) Disturbance alarm after = 100 ms
The Disturbance alarm after parameter determines the time delay after which defective or missing
telegrams are signaled as faulty.
Parameter: Transm. Fail. Alarm After
•
Default setting (_:5161:108) Transm. fail. alarm after = 6.0 s
The Transm. fail. alarm after parameter is used to set the time after which a failure of the communi-
cation is signaled.
NOTE
If the setting values of the parameters Disturbance alarm after and Transm. fail. alarm
after are exceeded, then an indication is generated.
Parameter: Delay time threshold
•
Default setting (_:5161:109) Delay time threshold = 30.0 ms
For the Delay time threshold, the default setting is selected such that it is not exceeded by normal
communication networks. If this time delay is exceeded during operation (for example, upon switchover to
another transmission route), the indication Time delay exceeded is issued.
Parameter: Difference Tx and Rx time
•
Default setting (_:5161:110) Difference Tx and Rx time = 0.1 ms
The Difference Tx and Rx time parameter can be used to set a maximum time-delay difference
between the send and receive paths.
Set this value to 0 for a direct fiber-optic connection. A higher value is necessary for transmission via commu-
nication networks. Reference value: 0.1 ms (recommended setting value).
NOTE
Only if the Line differential protection function is instantiated, the Difference Tx and Rx time
parameter is displayed.
NOTE
If the user employs a multiplexer with a C37.94 interface as a communication medium, Siemens recom-
mends a setting value of 0.25 ms to 0.6 ms.
Parameter: PPS Synchronization
•
Default setting (_:5161:113) PPS synchronization=PPS sync. off
If the SIPROTEC device operates with PPS synchronization (PPS: pulse per second), use the PPS synchroni-
zation parameter to define how the protection is activated after restoration of the communication connec-
tion (basic state or after transmission fault).
Refer to Figure 3-54.
System Functions
3.5 Protection Communication
126 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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