3
Relay blocks distance elements and directional elements default forward when
LOP condition is detected.
If the 52A input is asserted while LOP is detected, the Relay Word LOP bit is
asserted.
If the 52A input is not asserted while LOP is detected, the Relay Word LOP bit
is not asserted.
Relay asserts ALARM contact while the Relay Word LOP bit is asserted.
4
Relay sets LOP bit when loss-of-potential condition is detected.
Distance and directional elements are not blocked.
Relay asserts ALARM contact to indicate the LOP condition.
The following table summarizes the available LOPE settings and their results.
LOPE
Block 21
Setting
on LOP
N
No
Y
Yes
1
Yes
2
Yes
3
Yes
4
No
Table 2.3: LOPE Settings
52A Supervises LOP
Relay Word Bit
N o
N o
Yes
N o
Yes
No
Close ALARM Contact
on LOP Bit Assertion
No
No
No
Yes
Yes
Yes
Phase Overcurrent Conditions
50G
=
50AG + 50BG + 50CG
3G50
=
50AG * 50BG * 50CG
50NG
=
50N + 50G
50P
=
50AP + 50BP + 50CP
3P50
=
50AP * 50BP * 50CP
50H
=
50AH + 50BH + 50CH
Ground Overcurrent Conditions
67N
=
67NP *
[32Q
+ (
LOP
* LOPE=Y,
1, 2, OR 3) + NOT(67NTC)]
sensitive phase overcurrent condition
sensitive three-phase o/c condition
sensitive ground or phase o/c condition
phase overcurrent condition
three-phase overcurrent condition
high-level overcurrent condition
directionally supervised residual inst.
overcurrent element
Date Code 920508
Specifïcations
SEL-221F, -1 Instruction Manual
2-17
Summary of Contents for SEL-221F
Page 3: ......
Page 10: ......
Page 11: ......
Page 12: ......
Page 13: ......
Page 69: ...Date Code 920508 Specifications SEL 221F 1 Instruction Manual 2 44 ...
Page 70: ...Date Code 920508 Specifications SEL 221F 1 Instruction Manual 2 45 ...
Page 71: ...Date Code 920508 Specifications SEL 221F 1 Instruction Manual 2 46 ...
Page 72: ...Date Code 920508 Specifications SEL 221F 1 Instruction Manual 2 47 ...
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 ...