GE Multilin G60 Generator Management Relay 5-475 SETTINGS 5.2 PRODUCT SETUP5UR IED 1: DIRECT OUTPUT DEVICE ID: "1"DIRECT I/O RING CONFIGURATION: "Yes"DIRECT I/O DATA RATE: "128 kbps"UR IED 2: DIRECT OUTPUT DEVICE ID: "2"DIRECT I/O RING CONFIGURATION: "Yes"DIRECT I/O DATA RATE: "128 kbps"The message delivery time is about 0.2 of power cycle in both ways (at 128 kbps); i.e., from Device 1 to Device 2, and fromDevice 2 to Device 1. Different communications cards can be selected by the user for this back-to-back connection (fiber,G.703, or RS422).EXAMPLE 2: INTERLOCKING BUSBAR PROTECTIONA simple interlocking busbar protection scheme could be accomplished by sending a blocking signal from downstreamdevices, say 2, 3, and 4, to the upstream device that monitors a single incomer of the busbar, as shown below.Figure 5–8: SAMPLE INTERLOCKING BUSBAR PROTECTION SCHEMEFor increased reliability, a dual-ring configuration (shown below) is recommended for this application.Figure 5–9: INTERLOCKING BUS PROTECTION SCHEME VIA DIRECT INPUTS/OUTPUTSIn the above application, the following settings should be applied:UR IED 1: DIRECT OUTPUT DEVICE ID: “1” UR IED 2: DIRECT OUTPUT DEVICE ID: “2”DIRECT I/O RING CONFIGURATION: “Yes” DIRECT I/O RING CONFIGURATION: “Yes”UR IED 3: DIRECT OUTPUT DEVICE ID: “3” UR IED 4: DIRECT OUTPUT DEVICE ID: “4”DIRECT I/O RING CONFIGURATION: “Yes” DIRECT I/O RING CONFIGURATION: “Yes”Message delivery time is approximately 0.2 of power system cycle (at 128 kbps) times number of ‘bridges’ between the ori-gin and destination. Dual-ring configuration effectively reduces the maximum ‘communications distance’ by a factor of two.In this configuration the following delivery times are expected (at 128 kbps) if both rings are healthy:IED 1 to IED 2: 0.2 of power system cycle; IED 1 to IED 3: 0.4 of power system cycle;IED 1 to IED 4: 0.2 of power system cycle; IED 2 to IED 3: 0.2 of power system cycle;IED 2 to IED 4: 0.4 of power system cycle; IED 3 to IED 4: 0.2 of power system cycleIf one ring is broken (say TX2/RX2) the delivery times are as follows:842712A1.CDRUR IED 1UR IED 2 UR IED 4UR IED 3BLOCK842716A1.CDRUR IED 1RX1TX2TX1RX2UR IED 2TX2RX2RX1TX1UR IED 4TX1RX1RX2TX2UR IED 3RX2TX1TX2RX1
