GE L60 Instruction Manual page 201

Line phase comparison system, ur series
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5 SETTINGS
RX1
TX1
Figure 5–13: 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:
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:
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: 0.6 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.
A coordinating timer for this bus protection scheme could be selected to cover the worst case scenario (0.4 of a power sys-
tem cycle). Upon detecting a broken ring, the coordination time should be adaptively increased to 0.6 of a power system
cycle. The complete application requires addressing a number of issues such as failure of both the communications rings,
failure or out-of-service conditions of one of the relays, etc. Self-monitoring flags of the direct inputs and outputs feature
would be primarily used to address these concerns.
GE Multilin
TX1
UR IED 1
RX2
TX2
UR IED 2
RX2
TX2
UR IED 3
RX1
"1"
"Yes"
"Yes"
"2"
"Yes"
"Yes"
"3"
"Yes"
"Yes"
"4"
"Yes"
"Yes"
L60 Line Phase Comparison System
RX1
TX2
RX2
TX1
UR IED 4
TX2
RX1
RX2
TX1
842716A1.CDR
5.2 PRODUCT SETUP
5
5-63

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