BUS AND
BREAKER
FIG. #
ARRANGEMENT
S ingl e Bus
S i ngl e Bkr. 5
Doubl e Bus- 6
Doubl e Bkr.
Doubl e Bus- 6
Doubl e Bkr.
B reake r-&- 7
a - Ha
1
f
B reake r-&- 7
a - Ha l f
B reake r-&- 7
a-Ha l f
Ring Bus
8
GEK-45464
TABLE II
CURRENT CONTACT
B FT
B FT
B FT
FAULT FAILED FROM
INITIATION CONTACT CONTACT CONTACT
LOC. B REAKER ASSOC. FROM
#1 TRIPS #2 TRIPS #3 TRIPS
F1
F1
o r
F2
F1
o r
F3
Fl
o r
F3
F1
o r
F2
F2
o r
F4
F1
o r
F2
2
3
4
4
5
6
1
B REAKER
2
3
4
4
5
6
1
L i ne B
Bus
Lockou t -
Rel ay
No rth
L i ne B
B u s
o r
Lockout B rkr 4
No rth Bus Rel ay
South
L i ne B
B u s
o r
Locko u t B rkr 3
Sou th Bus Rel ay
No rth
L i ne A
B u s
o r
Lockou t B rkr 5
No rth Bus Rel ay
L i ne A
o r
B rkr 4
B rkr 6
L i ne B
South
L i ne B
B u s
o r
Lockou t B rkr 5
Sou th Bus Rel ay
Lock-o u t rel ay
that trans fe r
trips l i ne B &
bl ocks recl o s ing
of B rkr. 4
Lock-ou t rel ay
that trans fe r
trips l i ne B &
bl ocks recl os ing
of B rkr. 3
Lock-o u t rel ay
that trans fe r
trips B rkr. 10
bl ocks recl os ing
of B rkr. 5
Lock-ou t rel ay
that trans fe r
tr i ps B rkrs.lO
11 & bl ocks re
cl o s i ng of 4 & 6
Lock-ou t re l ay
that trans fe r
t r i ps B rkr. 11 &
bl ocks recl os ing
of B rkr. 5
L i ne A
o r
L i ne B
Lock-out rel ay
that trans fe r
B rkr 2
Brkr 6
t r i ps B rkrs. 7
& 8 & bl ocks re
cl os ing of 2 & 6
associ a ted wi th bre ake r #1. The contact ini t i a t i on i s from the pro tect i ve re l ays o f
l i ne A for a fau l t a t Fl . Fo r a fau l t at F2, the pro tecti ve rel ays o f l i ne B
prov i de the contact i n i t i a ti on. As suming breake r #1 fa i l s for a fau l t at Fl, the
SBC re l ay ope ra tes and the B FT contact t r i ps the fo l l owing: B FT #1 trips breake r #2
and B FT #2 tr i ps B reake r #6. B FT #3 tr i ps the l ockout rel ay that trans fe r tr i ps
breake rs #7 and #8 and bl ocks recl o s i ng o f #2 and #6.
5
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