GE L60, Instruction Manual, Page: 133 / 498

GE Multilin L60 Line Phase Comparison Relay 5-41
5 SETTINGS 5.2 PRODUCT SETUP
5
messages. This function counts all the outgoing messages and a separate counter adds the messages have failed to
return. When the unreturned messages counter reaches the user-definable level specified by the
UNRET MSGS ALARM CH1
THRESHOLD
setting and within the user-defined message count
UNRET MSGS ALARM CH1 COUNT
, the
DIR IO CH1 UNRET ALM
FlexLogic™ operand is set.
When the total message counter reaches the user-defined maximum specified by the
UNRET MSGS ALARM CH1 MESSAGE
COUNT
setting, both the counters reset and the monitoring process is restarted.
The operand shall be configured to drive an output contact, user-programmable LED, or selected communication-based
output. Latching and acknowledging conditions, if required, should be programmed accordingly.
The Unreturned Messages Alarm function is available on a per-channel basis and is active only in the ring configuration.
The total number of unreturned input/output messages is available as the
ACTUAL VALUES STATUS DIRECT INPUTS
UNRETURNED MSG COUNT CH1(2)
actual value.
5.2.17 TELEPROTECTION
PATH: SETTINGS PRODUCT SETUP TELEPROTECTION
Digital teleprotection functionality is designed to transfer protection commands between 2 or 3 relays 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 input/outputs are configured, data packets are transmitted continu-
ously every 1/4 cycle (3/8 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.
Teleprotection inputs/outputs and direct inputs/outputs are mutually exclusive – as such, they cannot be used simu-
latneously. Once teleprotection inputs/outputs are enabled, direct inputs/outputs are blocked, and
vice versa .
• NUMBER OF TERMINALS : Specifies whether the teleprotection system operates between 2 peers or 3 peers.
• NUMBER OF CHANNELS : Specifies how many channels are used. If the
NUMBER OF TERMINALS
is “3” (three-terminal
system), set the
NUMBER OF CHANNELS
to “2”. For a two-terminal system, the
NUMBER OF CHANNELS
can set to “1” or
“2” (redundant channels).
• LOCAL RELAY ID NUMBER , TERMINAL 1 RELAY ID NUMBER , and TERMINAL 2 RELAY ID NUMBER : In installa-
tions that use multiplexers or modems, it is desirable to ensure that the data used by the relays protecting a given line
is from the correct relays. The teleprotection function performs this check by reading the message ID sent by transmit-
ting relays and comparing it to the programmed ID in the receiving relay. This check is also used to block inputs if inad-
vertently set to loopback mode or data is being received from a wrong relay by checking the ID on a received channel.
If an incorrect ID is found on a channel during normal operation, the
TELEPROT CH1(2) ID FAIL
FlexLogic™ operand is
set, driving the event with the same name and blocking the teleprotection inputs. For commissioning purposes, the
result of channel identification is also shown in the
STATUS CHANNEL TESTS VALIDITY OF CHANNEL CONFIGURA-
TION
actual value. The default value of “0” for the
LOCAL RELAY ID NUMBER
indicates that relay ID is not to be checked.
TELEPROTECTION TELEPROTECTION
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
NUMBER OF TERMINALS:
2
Range: 2, 3
MESSAGE
NUMBER OF COMM
CHANNELS: 1
Range: 1, 2
MESSAGE
LOCAL RELAY ID
NUMBER: 0
Range: 0 to 255 in steps of 1
MESSAGE
TERMINAL 1 RELAY ID
NUMBER: 0
Range: 0 to 255 in steps of 1
MESSAGE
TERMINAL 2 RELAY ID
NUMBER: 0
Range: 0 to 255 in steps of 1
NOTE