Remote-End-Just-Opened (REJO) Enable Setting (REJOE)
When this feature is used, the SEL-221F relay can deliver accelerated trips for Zone 2 faults
without the use of a communications channel.
An overview of pilotless accelerated trip schemes is provided below. This description is
followed by a detailed description of the scheme implementation in the SEL-221F relay.
Pilotless Accelerated Trip Schemes
In many lower voltage transmission applications, the cost of communication equipment for
line protection is not justifiable. In these installations it is still possible to achieve accelerated
trip times. We can do this because certain system conditions indicate in-section faults.
In the system shown in the figures below, we know that after Breaker 2 clears its contribution
to the fault, the only current that is permitted to flow through Breaker 1 is fault current
through the Bø breaker pole.
Figure 5.5: Faulted System with Breakers 1 and 2 Closed
Figure 5.6: Faulted System with Breaker 2 Open
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Applications
SEL-221F, -1 Instruction Manual
Date Code 920508
Summary of Contents for SEL-221F
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Page 110: ...Example Event Report 2 4 12 Event Reporting SEL 221F 1 Instruction Manual Date Code 930830 ...
Page 158: ...SETTINGS SHEET FOR SEL 221F RELAY PAGE 2 OF 6 DATE Date Code 921110 ...
Page 160: ...SETTINGS SHEET PAGE 4 OF 6 FOR SEL 221F RELAY DATE Date Code 930601 ...
Page 161: ...SETTINGS SHEET PAGE 5 OF 6 FOR SEL 221F RELAY DATE Date Code 961208 ...
Page 229: ...SEL 200 Series Relay Main Board Troubleshooting Test Points and Jumper Locations ...