6.4.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Protection communication supervi-
sion
PCSITPC PCS PCS
6.4.2 Function block
Figure 754: Function block
6.4.3 Functionality
The protection communication supervision function PCSITPC monitors the
protection communication channel. PCSITPC blocks the line differential protection
functions when interference in the protection communication channel is
detected. The blocking takes place automatically for the LNPLDF and BSTGAPC
functions which are dependent on the continuous availability of the protection
communication channel.
The protection communication channel is continuously monitored by PCSITPC. 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. PCSITPC 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 PCSITPC 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 protection relays to the same blocking state during a protection
communication interference, even in cases where the interference is detected with
only one line end protection relay. 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.
1MRS759142 F
Supervision functions
REX640
Technical Manual
1327
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