GE T60 Instruction Manual page 145

5 SETTINGS
UR IED 1:
DIRECT OUTPUT DEVICE ID:
DIRECT I/O RING CONFIGURATION:
DIRECT I/O DATA RATE:
UR IED 2:
DIRECT OUTPUT DEVICE ID:
DIRECT I/O RING CONFIGURATION:
DIRECT I/O DATA RATE:
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 from
Device 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 PROTECTION
A simple interlocking busbar protection scheme could be accomplished by sending a blocking signal from downstream
devices, say 2, 3, and 4, to the upstream device that monitors a single incomer of the busbar, as shown below.
Figure 5–9: SAMPLE INTERLOCKING BUSBAR PROTECTION SCHEME
For increased reliability, a dual-ring configuration (shown below) is recommended for this application.
Figure 5–10: INTERLOCKING BUS PROTECTION SCHEME VIA DIRECT INPUTS/OUTPUTS
In the above application, the following settings should be applied:
UR IED 1:
DIRECT OUTPUT DEVICE ID:
DIRECT I/O RING CONFIGURATION:
UR IED 3:
DIRECT OUTPUT DEVICE ID:
DIRECT I/O RING CONFIGURATION:
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 cycle
If one ring is broken (say TX2/RX2) the delivery times are as follows:
GE Multilin
Courtesy of NationalSwitchgear.com
"1"
"Yes"
"128 kbps"
"2"
"Yes"
"128 kbps"
UR IED 2 UR IED 3
TX1
UR IED 1
RX2
RX1 TX2
UR IED 2
TX1 RX2
TX2
UR IED 3
RX1
"1"
"Yes"
"3"
"Yes"
T60 Transformer Management Relay
UR IED 1
BLOCK
UR IED 4
842712A1.CDR
RX1
TX2
RX2 TX1
UR IED 4
TX2 RX1
RX2
TX1
842716A1.CDR
UR IED 2:
DIRECT OUTPUT DEVICE ID:
DIRECT I/O RING CONFIGURATION:
UR IED 4:
DIRECT OUTPUT DEVICE ID:
DIRECT I/O RING CONFIGURATION:
5.2 PRODUCT SETUP
5
"2"
"Yes"
"4"
"Yes"
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