GE M60 UR Series

5-90 M60 Motor Protection System GE Multilin
5.2 PRODUCT SETUP 5 SETTINGS
5
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.
Figure 5–19: SAMPLE INTERLOCKING BUSBAR PROTECTION SCHEME
For increased reliability, a dual-ring configuration (shown below) is recommended for this application.
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: “1”
DIRECT I/O CH1 RING CONFIGURATION: “Yes”
DIRECT I/O CH2 RING CONFIGURATION: “Yes”
For UR-series IED 2:
DIRECT OUTPUT DEVICE ID: “2”
DIRECT I/O CH1 RING CONFIGURATION: “Yes”
DIRECT I/O CH2 RING CONFIGURATION: “Yes”
For UR-series IED 3:
DIRECT OUTPUT DEVICE ID: “3”
DIRECT I/O CH1 RING CONFIGURATION: “Yes”
DIRECT I/O CH2 RING CONFIGURATION: “Yes”
For UR-series IED 4:
DIRECT OUTPUT DEVICE ID: “4”
DIRECT I/O CH1 RING CONFIGURATION: “Yes”
DIRECT I/O CH2 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:
842712A1.CDR
UR IED 1
UR IED 2
UR IED 4
UR IED 3
BLOCK
842716A1.CDR
UR IED 1
RX1
TX2
TX1
RX2
UR IED 2
TX2
RX2
RX1
TX1
UR IED 4
TX1
RX1
RX2
TX2
UR IED 3
RX2
TX1
TX2
RX1