ground distance protection
TRANSCRIPT
![Page 1: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/1.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 1/26
Copyright © FPL and SEL 2015
Breaker Pole Scatter
and Its Effect on !adrilateral"ro!nd #istance Protection
James Ryan,Florida Power & Light Company
Arun Shrestha and Thanh-Xuan Nguyen,Schweitzer Engineering Laboratories, Inc.
![Page 2: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/2.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 2/26
$!tline
• Breaker pole scatter
• Zone 1 challenges hen protect!ng
short l!nes
• "uadr!lateral d!stance element
• #ase study
• Solut!on and test results
• #onclus!on
![Page 3: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/3.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 3/26
Fa!lt Clearing %i&e
![Page 4: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/4.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 4/26
'or&al Breaker Pole Scatter
B# $ault current!nterrupt!on
Normal load current
!nterrupt!on
![Page 5: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/5.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 5/26
(igh Breaker Pole Scatter
%elayed &hase #current !nterrupt!on
'rare(
AB $ault current
!nterrupt!on
![Page 6: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/6.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 6/26
Factors )ffecting Breaker Pole Scatter
• Breaker operat!ng mechan!sm
• %!electr!c strength o$ arc !nterrupters
•)*ternal c!rcu!t parameters dur!ng $ault
![Page 7: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/7.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 7/26
Protection of Short Lines
• +ault res!stance can e s!gn!$!cantly h!gherthan l!ne !mpedance
• ho ground d!stance elements ha.e
l!m!ted $ault res!stance co.erage
• "uadr!lateral ground d!stance elements
are pre$erred
![Page 8: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/8.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 8/26
Fa!lt on Short %rans&ission Line
![Page 9: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/9.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 9/26
!adrilateral "ro!nd #istance Ele&ent
![Page 10: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/10.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 10/26
Factors %hat *ay )ffect !adrilateral
"ro!nd #istance Ele&ent
• /pen-pole cond!t!ons
• Breaker pole scatter
![Page 11: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/11.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 11/26
Case St!dy
• Study e$$ect o$ B0 pole scatter on relay at B1
• Test cases 'B0(
♦ Normal $ault current !nterrupt!on
♦ nterrupt!on delayed y 234 cycles !n one pole
![Page 12: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/12.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 12/26
'or&al Fa!lt Interr!ptionB!s +
![Page 13: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/13.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 13/26
Interr!ption #elayed ,y 0-5 Cycles
![Page 14: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/14.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 14/26
Interr!ption #elayed ,y 0-5 CyclesB!s +
![Page 15: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/15.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 15/26
Interr!ption #elayed ,y 0-5 CyclesB!s .
![Page 16: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/16.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 16/26
+one 1 B" /eactance and
/esistance Calc!lation
5hen +SB asserts, relay !ssues tr!p command to reakers
![Page 17: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/17.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 17/26
FPL Syste&
![Page 18: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/18.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 18/26
Sit!ation Leading to
nintended $peration
• 6!gh reaker pole scatter o$
234 cycles 'rare(
• Strong sources at oth ends'SR 7 132(
• 8ery short l!nes
• 9arge res!st!.e co.erage $or :uadr!lateralground d!stance elements
![Page 19: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/19.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 19/26
FPL nintended $peration
![Page 20: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/20.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 20/26
+one 1 B" /eactance and
/esistance Calc!lation
![Page 21: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/21.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 21/26
Proposed Sol!tion
![Page 22: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/22.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 22/26
C$*%/)#E Play,ack %est
![Page 23: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/23.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 23/26
/%#S %est /e&ote Fa!lt
![Page 24: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/24.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 24/26
/%#S %est +one 1 Fa!lt
![Page 25: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/25.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 25/26
Concl!sion
• 6!gh reaker pole scatter may occur asreakers ear and age
• Zone 0 element super.!s!on adds secur!ty
to :uadr!lateral d!stance elements dur!ngpole-scatter operat!ng cond!t!ons !thout
sacr!$!c!ng dependa!l!ty
![Page 26: Ground Distance Protection](https://reader036.vdocuments.site/reader036/viewer/2022062504/5695d0471a28ab9b0291cce2/html5/thumbnails/26.jpg)
7/23/2019 Ground Distance Protection
http://slidepdf.com/reader/full/ground-distance-protection 26/26
!estions3