Figure 1.1:
System Single Line Diagram for the SEL-221F-1 Relay Modification
Explanation
OTHER SEL-221F RELAY MODEL VARIATIONS
This model variation description is provided for comparison purposes.
SEL-221F-8 Relay
The SEL-221F-8 relay has several differences from the basic SEL-221F relay model. A
Level 2 access attempt does not pulse the ALARM contacts as in the SEL-221F relay.
Instead, the ALARM contact pulses for four seconds after three unsuccessful Level 1 or 2
access attempts. DATE, TIME, TRIGGER, and IRIG command execution requires Level 2
access. In contrast, the basic SEL-221F relay requires only Level 1 access for these com-
mands. TARGET command execution from Level 1 only displays targets. TARGET
command execution from Level 2 displays targets and allows the operator to change front
panel LED assignments. Excluding these differences, the SEL-221F-8 relay is identical to the
SEL-221F relay.
GENERAL DESCRIPTION
Because the -1 relay variation is derived from the SEL-221F relay, this manual refers to both
variations (standard and -1) as the SEL-221F relay.
The SEL-221F Phase and Ground Distance Relay with fault locator simultaneously provides
high-speed and time delayed protection for transmission, subtransmission, and distribution
lines. A 24-bit Relay Word combines mho distance elements, overcurrent elements, dir-
ectional element, timers, and data and control bits. You can program the tripping, output,
and reclosing logic through Relay Word bit combinations to control the relay outputs.
Date Code 920508
Introduction
SEL-221F, -1 Instruction Manuel
1-3
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 ...