Direct Input And Output Commands; Teleprotection Inputs And Outputs - GE D90 Plus Instruction Manual

TELEPROTECTION INPUTS AND OUTPUTS

Direct input and output commands

Teleprotection inputs and outputs
NOTE:
162
CRC Fail Count
Range: 0 to 65535 in steps of 1
These actual values (one per communications channel) display the number of direct
output messages that have been received but fail the CRC check. High values can
indicate a problem with wiring or the communication channel on one or more devices.
This value can be reset to zero using the Clear Direct I/O Counters command.
Unreturned Message Count
Range: 0 to 65535 in steps of 1
These actual values (one per communications channel) display the number of direct
output messages that do not complete the trip around the communications ring. High
values can indicate a problem with wiring or the communication channel on one or
more devices. This value can be reset to zero using the Clear Direct I/O Counters
command. If the
Message Alarm Function
value is frozen to the value at the time of change.
Select the Actual Values > Communications > Commands > Commands menu to open
the inter-relay communications commands.
Figure 145: Inter-relay communications commands
The following command is available for direct inputs and outputs.
Clear Direct I/O Counters
This command clears the statistic counters for the direct input/output CRC fail count and
the unreturned message count.
Digital teleprotection transfers protection commands between two or three IEDs in a
secure, fast, dependable, and deterministic fashion. Possible applications are permissive or
blocking pilot schemes and direct transfer trip (DTT). Teleprotection can be applied over
any analog or digital channels and any communications media, such as direct fiber,
copper wires, optical networks, or microwave radio links. A mixture of communication
media is possible.
Once teleprotection is enabled and the teleprotection inputs and outputs are configured,
data packets are transmitted continuously every ¼ cycle (⅜ cycle if using C37.94 modules)
from peer-to-peer. Security of communication channel data is achieved by using CRC-32
on the data packet. The baud rate between the peers must be the same for proper
operation of the teleprotection feature.
Teleprotection communication is supported between UR
Plus
UR -series and a UR-series IED over the G.703, C37.94, and RS422 communication
interfaces.
setting is changed to "Disabled," then this
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: COMMUNICATIONS
Plus
-series IEDs or between a