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2.37.5 Communication bits for OSTV
When the function ‘Out of step tripping by voltage (OSTV)’ operates, the area of the ‘V
0
’ is used
for the communication for the OSTV function in place of sending the zero-sequence voltage.
For more information about the OSTV function, see Chapter
Relay application: Out of step
tripping by voltage
.
2.37.6 Usage of sub-communication channel
Figure 2.37-6 shows the connection and monitoring points in the COM3_1bit to COM3_8bit of
Wide (N=3) communication. For example, when the user wishes to send a bit-signal using the
COM3_1 sub-channel, the user should connect the signal with PLC connection point “COM3-
1_S”. On the other hand, when the user wishes to retrieve a bit-signal from the COM3_1 sub-
channel of the remote terminal-1, the user should use PLC monitoring point “COM3-1_R1”.
With regard to the reception from the remote terminal-2, other PLC monitoring points are
provided. Entire PLC connection points and monitoring points for the sub-communication
channels are shown later.
b. PLC monitoring points
as to the reception
from remote terminal 1
c. PLC monitoring
points as to the
reception from
remote terminal 2
Figure 2.37-6 Connection and monitoring points for COM3 (1 to 8 bits)
2.37.7 Setting of open terminal detection
The open terminal detection (OTD) function is provided and a set of Off is placed for scheme
switch [OTD] as a default.
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