GE UR series

GE Multilin L60 Line Phase Comparison System 5-55
5 SETTINGS 5.2 PRODUCT SETUP
5
messages both ways around a ring configuration. On type 7 cards that support one channel, direct output messages are
sent only in one direction. Messages will be resent (forwarded) when it is determined that the message did not originate at
the receiver.
Direct output message timing is similar to GSSE message timing. Integrity messages (with no state changes) are sent at
least every 1000 ms. Messages with state changes are sent within the main pass scanning the inputs and asserting the
outputs unless the communication channel bandwidth has been exceeded. Two self-tests are performed and signaled by
the following FlexLogic™ operands:
1.
DIRECT RING BREAK (direct input/output ring break). This FlexLogic™ operand indicates that direct output messages
sent from a UR-series relay are not being received back by the relay.
2. DIRECT DEVICE 1 OFF to DIRECT DEVICE 16 OFF (direct device offline). These FlexLogic™ operands indicate that direct
output messages from at least one direct device are not being received.
Direct input and output settings are similar to remote input and output settings. The equivalent of the remote device name
strings for direct inputs and outputs is the DIRECT OUTPUT DEVICE ID. The DIRECT OUTPUT DEVICE ID setting identifies the
relay in all direct output messages. All UR-series IEDs in a ring should have unique numbers assigned. The IED ID is used
to identify the sender of the direct input and output message.
If the direct input and output scheme is configured to operate in a ring (
DIRECT I/O CH1 RING CONFIGURATION or DIRECT I/O
CH2 RING CONFIGURATION is “Yes”), all direct output messages should be received back. If not, the direct input/output ring
break self-test is triggered. The self-test error is signaled by the DIRECT RING BREAK FlexLogic™ operand.
Select the DIRECT I/O DATA RATE to match the data capabilities of the communications channel. All IEDs communicating
over direct inputs and outputs must be set to the same data rate. UR-series IEDs equipped with dual-channel communica-
tions cards apply the same data rate to both channels. Delivery time for direct input and output messages is approximately
0.2 of a power system cycle at 128 kbps and 0.4 of a power system cycle at 64 kbps, per each ‘bridge’.