GE C70 Instruction Manual page 231

CHAPTER 5: SETTINGS
DIRECT OUTPUT DEVICE ID: "2"
DIRECT I/O CH1 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); 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.
For increased reliability, a dual-ring configuration (shown as follows) is recommended for this application.
Figure 5-42: Interlocking bus protection scheme via direct inputs/outputs
RX1
TX1
In this application, apply the following settings. 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"
C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
Figure 5-41: Sample interlocking busbar protection scheme
UR IED 2 UR IED 3
TX1
UR IED 1
RX2
TX2
UR IED 2
RX2
TX2
UR IED 3
RX1
UR IED 1
BLOCK
UR IED 4
842712A1.CDR
RX1
TX2
RX2 TX1
UR IED 4
TX2 RX1
RX2
TX1
842716A1.CDR
PRODUCT SETUP
5
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