6.3.2 Function block
GUID-8732CEA2-358D-441A-B5BB-B2DC9E36E4A4 V1 EN
Figure 319: Function block
6.3.3 Functionality
The protection communication supervision function PCSRTPC monitors the
protection communication channel. PCSRTPC blocks the line differential
protection functions when interference in the protection communication channel is
detected. The blocking takes place automatically for the LNPLDF and BSTGGIO
functions which are dependent on the continuous availability of the protection
communication channel.
The protection communication channel is continuously monitored by PCSRTPC.
The function detects missing or delayed protection telegrams. Protection telegrams
are used for transferring the sampled analog and other protection related data.
Missing or delayed protection telegrams can jeopardize the demand operate speed
of the differential protection.
When a short-term interference is detected in the protection communication
channel, the function issues a warning and the line differential functions are
automatically internally blocked. PCSRTPC reacts fast for the protection
communication interferences. The blocking takes place at the latest when a
communication interruption lasting for two fundamental network periods is
detected. When a severe and long lasting interference or total interruption in the
protection communication channel is detected, an alarm is issued (after a five-
second delay). The protection communication supervision quality status is
exchanged continuously online by the local and remote PCSRTPC instances. This
ensures that both local and remote ends protection blocking is issued coordinately.
This further enhances the security of the line differential protection by forcing both
line end IEDs to the same blocking state during a protection communication
interference, even in cases where the interference is detected with only one line end
IED. There is also the Reset delay time settings parameter available which is used
for changing the required interference-free time before releasing the line-
differential protection back in operation after a blocking due to an interference in
communication.
1YHT530004D05 D Section 6
Supervision functions
615 series 589
Technical Manual
To Next Page
Loading...
Need help?
General
