7-38
Maintenance and Testing
Date Code 20010215
SEL-321-2 Instruction Manual
HOHPHQWWRSURYLGHLPSURYHGGLUHFWLRQDOVHFXULW\)RUZDUGUHDFKLQJGLVWDQFHHOHPHQWVPD\QRW
DVVHUWXQOHVVWKH4)HOHPHQWLVDVVHUWHG5HYHUVHUHDFKLQJGLVWDQFHHOHPHQWVPD\QRWDVVHUW
XQOHVVWKH45HOHPHQWLVDVVHUWHG
Loss-of-Potential Logic
,I(/23 <<RU<WKHUHOD\VXSHUYLVHVWKHJURXQGGLVWDQFHHOHPHQWORJLFXVLQJWKH,QWHUQDO
/RVVRI3RWHQWLDOFRQGLWLRQ,/23:KHQ(/23 <<RU<WKHUHOD\GLVDEOHVWKHJURXQG
GLVWDQFHHOHPHQWVZKHQDORVVRISRWHQWLDOLVGHWHFWHGUHJDUGOHVVRIRWKHUVLJQDOVDSSOLHGWRWKH
UHOD\,I\RXWHVWWKHJURXQGGLVWDQFHHOHPHQWVXVLQJORZYROWDJHVLJQDOVVHW(/23 1WR
VLPSOLI\WKHWHVW
Single-Pole Open Logic
,QVLQJOHSROHWULSDSSOLFDWLRQVWKHUHOD\FDQQRWSURSHUO\SRODUL]HRURSHUDWHWKHJURXQGGLVWDQFH
HOHPHQWVDVVRFLDWHGZLWKDQRSHQEUHDNHUSROH7KHUHOD\6LQJOH3ROH2SHQORJLFGLVDEOHVWKH
JURXQGGLVWDQFHHOHPHQWDVVRFLDWHGZLWKDQRSHQEUHDNHUSROH)RULQVWDQFHLI3ROH$LVRSHQ
WKHUHOD\FDQQRWRSHUDWHWKH$*JURXQGPKRGLVWDQFHHOHPHQWV,IDQ\VLQJOHSROHLVRSHQWKH
UHOD\GLVDEOHVDOOJURXQGTXDGULODWHUDOGLVWDQFHHOHPHQWV7RVLPSOLI\GLVWDQFHHOHPHQWWHVWV
DSSO\FRQWUROYROWDJHWRDQ\LQSXWVDVVLJQHGWRSHUIRUPWKHDX[LOLDU\IXQFWLRQVRUGLVDEOHWKH
6LQJOH3ROH2SHQORJLFE\VHWWLQJ(632 1
Three-Pole Open Logic
,IVLJQLILFDQWSROHVFDWWHURFFXUVZKHQDFLUFXLWEUHDNHUFORVHVVHQVLWLYHJURXQGGLVWDQFH
HOHPHQWVPD\RSHUDWHXQGHVLUDEO\GXHWRWKHXQEDODQFHGVLJQDOVDSSOLHG7KH6(/5HOD\
GLVDEOHVWKHJURXQGGLVWDQFHHOHPHQWVGXULQJ7KUHH3ROH2SHQFRQGLWLRQVDQGIRUDVKRUW
VHWWDEOHWLPHDIWHUWKHEUHDNHUFORVHV7KHWLPHLVVHWE\WKH32'WLPHGHOD\VHWWLQJV7R
VLPSOLI\GLVWDQFHHOHPHQWWHVWVDSSO\FRQWUROYROWDJHWRDQ\LQSXWVDVVLJQHGWRSHUIRUPWKH
DX[LOLDU\IXQFWLRQV
Ground Distance Element Disable Inputs
7KH6(/5HOD\LVHTXLSSHGZLWKJURXQGGLVWDQFHHOHPHQWGLVDEOLQJLQSXWV3$5$3$5%
DQG3$5&:KHQDUHOD\LQSXWDVVLJQHGWRRQHRIWKHVHIXQFWLRQVLVDVVHUWHGWKHUHOD\GLVDEOHV
WKHJURXQGGLVWDQFHHOHPHQWVDVVRFLDWHGZLWKWKDWSKDVH)RULQVWDQFHLI,QSXWLVDVVLJQHGWR
3$5$HDFKWLPH,QSXWLVDVVHUWHGDOORIWKH$JURXQGGLVWDQFHHOHPHQWVDUHGLVDEOHG
Ground Mho Distance Element Test Using Three Voltage Sources and One Current
Source
1RWH
7KLVWHVWUHIHUVGLUHFWO\WRWKH=RQHJURXQGPKRGLVWDQFHHOHPHQWEXWPD\EH
DSSOLHGWRDQ\RWKHUIRUZDUGUHDFKLQJJURXQGPKRGLVWDQFHHOHPHQW]RQH7RWHVW
UHYHUVHUHDFKLQJ]RQHVVLPSO\DGG
WRWKHFDOFXODWHGWHVWFXUUHQWSKDVHDQJOH
9HULI\FRUUHFWRSHUDWLRQRIWKH45HOHPHQWIRUWKHWHVWYROWDJHDQGFXUUHQWVLJQDOV
XVLQJ(TXDWLRQLQWKH1HJDWLYH6HTXHQFH'LUHFWLRQDO(OHPHQW7HVW3URFHGXUH
6WHS
([HFXWHWKH
6+2:6(7
FRPPDQGDQGYHULI\WKHIROORZLQJUHOD\VHWWLQJV=0$*
=$1**0+2=',5=0*/*N0N$=)DQG4)7KH
Summary of Contents for SEL-321-2
Page 4: ......
Page 8: ......
Page 10: ......
Page 18: ......
Page 71: ...Date Code 20010215 Specifications 2 49 SEL 321 2 Instruction Manual LJXUH RJLF 6 PERO HJHQG ...
Page 87: ...Date Code 20010215 Specifications 2 65 SEL 321 2 Instruction Manual LJXUH 9ROWDJH OHPHQW RJLF ...
Page 102: ......
Page 156: ......
Page 252: ......
Page 253: ...SEL DIRECTION AND POLARITY CHECK FORM ...
Page 254: ......
Page 255: ...SEL DIRECTION AND POLARITY CHECK FORM ...
Page 256: ......
Page 260: ......
Page 326: ......
Page 328: ......
Page 332: ......
Page 336: ......