GE B30 Instruction Manual page 223

5 SETTINGS
EXAMPLE 1: EXTENDING THE INPUT/OUTPUT CAPABILITIES OF A UR-SERIES RELAY
Consider an application that requires additional quantities of contact inputs or output contacts or lines of programmable
logic that exceed the capabilities of a single UR-series chassis. The problem is solved by adding an extra UR-series IED,
such as the C30, to satisfy the additional input and output and programmable logic requirements. The two IEDs are con-
nected via single-channel digital communication cards as shown in the figure below.
Figure 5–17: INPUT AND OUTPUT EXTENSION VIA DIRECT INPUTS AND 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:
"128 kbps"
DIRECT I/O DATA RATE:
For UR-series IED 2:
DIRECT OUTPUT DEVICE ID:
DIRECT I/O CH1 RING CONFIGURATION:
"128 kbps"
DIRECT I/O DATA RATE:
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 5–18: SAMPLE INTERLOCKING BUSBAR PROTECTION SCHEME
For increased reliability, a dual-ring configuration (shown below) is recommended for this application.
GE Multilin
UR IED 1
UR IED 2
"1"
"Yes"
"2"
"Yes"
UR IED 2 UR IED 3
B30 Bus Differential System
TX1
RX1
TX1
RX1
842711A1.CDR
UR IED 1
BLOCK
UR IED 4
842712A1.CDR
5.2 PRODUCT SETUP
5
5-89