2-4 Specifications Date Code 20011026
SEL-321/321-1 Instruction Manual
Zone Blocking Enable Settings OOSB1 - OOSB4
Timer Settings
OOS Blocking Delay OSBD
OOS Tripping Delay OSTD
Rectangular OOS
Characteristic Settings
Top Bottom Right Left
Zone 5 X1T5 X1B5 R1R5 R1L5
Zone 6 X1T6 X1B6 R1R6 R1L6
Overcurrent Supervision Setting 50ABC
50Q1 for removing OSB1 condition in the M1P logic
50Q2 for removing OSB2 condition in the M2P logic
50Q3 for removing OSB3 condition in the M3P logic
50Q4 for removing OSB4 condition in the M4P logic
Maximum Time of Block 2 seconds
Outputs
Zone 5 Element X5ABC
Zone 6 Element X6ABC
Overcurrent Element 50ABC
Out-of-Step Block Condition OSB
Zone 1 - 4 Blocked OSB1 OSB2 OSB3 OSB4
Out-of-Step Trip Initiated OSTI
Out-of-Step Trip Condition OST
These outputs may be used for alarming or controlling other equipment.
Supporting Drawings: Figure 2.19 and Figure 2.20.
LOAD-ENCROACHMENT CHARACTERISTICS
The load-encroachment feature permits setting the distance protection independent of the line
loading.
Two independent positive-sequence impedance characteristics monitor load conditions. When
load is in either of these characteristics, and the load-encroachment logic is enabled (ELE = Y),
then the three-phase distance elements are blocked.
One characteristic monitors load-flow out, and the other monitors load-flow in. The settings are
load impedance magnitude and angle limits. Normally, these characteristics are set to
accommodate maximum load (minimum load impedance), and some margin, to ensure heavy
loads remain inside the load characteristic.
Settings
Load-Out Region Load-In Region
Minimum load impedance ZLF ZLR
Load-angle limits PLAF (-90° to +90°) PLAR (90° to 270°)
NLAF (-90° to +90°) NLAR (90° to 270°)
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