GE M60 UR Series Instruction Manual page 218

5.2 PRODUCT SETUP
The message delivery time is about 0.2 of power cycle in both ways (at 128 kbps); that is, 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 (for
example: 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.
For increased reliability, a dual-ring configuration (shown below) is recommended for this application.
5
Figure 5–20: INTERLOCKING BUS PROTECTION SCHEME VIA DIRECT INPUTS/OUTPUTS
In the above application, the following settings should be applied. For UR-series IED 1:
DIRECT OUTPUT DEVICE ID:
DIRECT I/O CH1 RING CONFIGURATION:
DIRECT I/O CH2 RING CONFIGURATION:
For UR-series IED 2:
DIRECT OUTPUT DEVICE ID:
DIRECT I/O CH1 RING CONFIGURATION:
DIRECT I/O CH2 RING CONFIGURATION:
For UR-series IED 3:
DIRECT OUTPUT DEVICE ID:
DIRECT I/O CH1 RING CONFIGURATION:
DIRECT I/O CH2 RING CONFIGURATION:
For UR-series IED 4:
DIRECT OUTPUT DEVICE ID:
DIRECT I/O CH1 RING CONFIGURATION:
DIRECT I/O CH2 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:
5-90
UR IED 2 UR IED 3
Figure 5–19: SAMPLE INTERLOCKING BUSBAR PROTECTION SCHEME
RX1 TX2
UR IED 2
TX1 RX2
"1"
"Yes"
"Yes"
"2"
"Yes"
"Yes"
"3"
"Yes"
"Yes"
"4"
"Yes"
"Yes"
M60 Motor Protection System
UR IED 1
UR IED 4
TX1 RX1
UR IED 1
RX2 TX2
RX2
UR IED 4
TX2
TX2 RX2
UR IED 3
RX1 TX1
5 SETTINGS
BLOCK
842712A1.CDR
TX1
RX1
842716A1.CDR
GE Multilin