Low-set three-phase overcurrent elements may be used in Remote-End-Just-Opened
(REJO) logic to detect remote breaker clearance of in-section faults.
High-set phase overcurrent element provides switch-onto-fault protection for close-in
three-phase faults.
Remote-End-Just-Opened (REJO) Protection
User selected elements enabled to trip if remote breaker clears fault contribution.
Provides pilotless accelerated tripping in many applications.
Switch-Onto-Fault Protection
User selected elements enabled to trip for 52BT time after the line breaker closes.
Functions independently from communications channel equipment.
Reclosing
Single reclosing shot with settable open interval timer.
Selectable reclose initiate and cancel conditions.
Settable reclose reset timer.
Selectable voltage checking and synchronism checking can supervise reclosing.
Voltage Checking
Closing may be supervised by Live-line/Dead-Bus conditions, Live-bus/Dead-line
conditions, or either condition.
Supervision may be applied to closures initiated by external equipment.
Supervision is independent of polarizing potential transformer location; you may use
either supervision scheme with line-side or bus-side polarizing potentials.
Synchronism Checking
Closing may be supervised by a synchronism checking function.
Supervision may be applied to closures initiated by external equipment.
Relay setting allows synch-check potential to be taken from any phase.
IRIG-B Input
The relay accepts demodulated IRIG-B from an external clock source to set the internal clock
automatically.
2-4
Specifications
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 ...