GEK-45464
STATIC BREAKER BACKUP RELAYS
TYPES SBC23A, SBC23B, SBC23C
INTRODUCTION
The type SB C23A, SB C23B, and SB C23C re l ays a re sta t i c breaker-fa i l u re rel ays
d e s i gned to prov i d e sys tem backup pro tec t i o n i n the event o f a c i rcu i t breaker
fa i l ure.
The se re l ays mee t the majo r requ i rements o f a breaker-fa i
1
u re backup
scheme - high securi ty and capabi l i ty fo r fa st cl eari ng t i mes.
These re l ays a re
appl i cabl e wi th any o f the sev e ra l bus/breake r a r ran gements i n gen e ra l u se, and over
a w i de ra nge of fau l t-cu rrent cond i t i ons wh i c h may be encou ntered. One type SBC
rel ay is requ i red fo r each breaker.
DESCRIPTION
The SBC rel ays cov ered by the s e i n struct i o n s a re packaged i n the M2D d rawout ca se,
the o u tl i ne a nd mou n t i ng d i men s i ons fo r wh i c h a re s hown i n Fi gu re 1. The rel ays
i ncl u de the fo l l ow i n g bas i c components and fea tu res:
1.
Inpu t prov i s i ons fo r a conta c t i n i t i a t i on ( B FI, 6 2X, 62Y) that acti vates the
power s uppl y and the rel ay.
2. A fa st re set curre nt detector w i th two i ndependentl y-adju s tabl e pi ckup setti ngs
fo r phase ( IA, .Is, Ic) a nd ground ( 3Io) curren ts.
3.
An adjus tabl e t i me r to prov i de t i me fo r the pr i ma ry breake r to ope ra te
correctl y.
4.
Three e l ec tr i cal l y-sepa ra te conta c t ou tput c i rcui ts ( B FT) fo r tripp i n g the
backup breakers. Two of these c i rcu i ts have e l ec tromechan i ca l s e r i e s targe ts.
5.
An el ec trical l y-sepa ra te i ns ta nta neous ( IT u n i t ) con ta c t, ope ra ted by th e
ou tpu t o f the l evel de tec to r. If sea l -i n i s u s ed on the SB C23B a nd S B C23C
model s, the IT contact is
not
i so l a ted.
6. A regul a ted powe r supp l y.
7 . S u rge suppress i on on a l l A C a nd DC i nput c i rcu i t s.
These instructions do not purport to cover all details or variations
ia
equipment nor to provide for
every possible contingency to be met in connection with installation,
oper.tion or maintenance.
Should
further information be desired or should parti cular problems arise which are not covered sufficiently for
the purchaser's purposes, the matter should be referred to the General Electric Co�any.
To the extent required the products described herein meet applicable AISI,
IEEE and
HE�
standards;
but no such assurance is given with respect to local codes and ordinances because they vary greatly.
3
www
. ElectricalPartManuals
. com
