Characteristics; Timer; Current Detector - GE SBC23A Instructions Manual

Static breaker backup relays

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As i de from the l o g i c func t i o n s t here a re four ( 4) ba s i c un i ts, t h e cha racte r i s t i cs

o f wh i ch a re i mpo rta n t to t h e appl i ca t i on o f a l l t h e S B C rel ays.

bel ow.

POWER SUPPLY

Al l

th e S B C rel ays cov e re d by th i s book co n ta i n a regul a ted powe r suppl y.

powe r suppl y re gul a te s the vol ta ge to t he l o g i c funct i on s so t ha t they pe r fo rm

prope rl y ov e r a ra nge o f appl i ed D C vol tage from 80% to 110% o f ra ted v o l ta ge.

The power suppl y ca rd a l so pro v i des d e fe n s e a ga i n s t ope ra t i on for ground i n g o f rel ay

t e rm i n a l 17.

The powe r supp l y card mus t see g re a te r t h a n 6 0% o f ba t te ry vol ta ge

be fo re the power suppl y w i l l be sw i tched on.

OUTPUT REL AYS

The t r i p output o f a l l the S B C rel ays co ns i s ts o f a h i g h - speed te l ephone r e l ay w i t h

s e v e ra l co n tacts.

o f t h e i n s t a n t t h a t t h e co i l

s h o r te r pul s e o f e n er g i za t i o n may a l so caus e t he output rel ay to cl o s e i ts co n tacts.

Th i s i s i n e ffect 1 1ove rtra ve l 11 •

m i l l i s econds.

The d ropout t i me o f t h e output rel ay i s somewha t l o n g e r t h a n 2

cycl es.

TIMER

The

t i me rs

i n

a l l

per formance.

T he resul ut i o n o f t h e s e tt i n g mecha n i sm i s such tha t these t i me r s may

be s e t as s hown on t h e cal i bra t i on pl a te.

t i me r w i l l repe a t i ts t i mi n g opera t i on t o w i th i n .:!: 2 % o f i ts s e t t i ng.

e n t i re ra nge o f a pp l i ed DC vol tage from 80% t o 110% o f ra ted, o r tempe ra ture from

-20 to +600C, the t i mer w i l l h o l d i ts s e tt i n g to w i th i n.:!: 5 % o f s e tt i n g.

The t i mers i n a l l t h e S B C rel ays have a v e ry qui ck r e s e t.

i s remo v e d for a t i me i n the order o f 0.2 m i l l i s eco nds o r l o n g e r,

compl e te l y.

Thus, i n o rd e r fo r the t i me r t o t i me out, i t requ i re s a co n t i nuous

unbroken i nput fo r t h e compl e te t i mi n g cycl e.

CURRENT DETECTOR

The curren t d etecto r i n a l l the S B C r e l ays i s compr i s ed o f magne t i c i nput c i rcui t s

f o r e ach p h a s e cur rent a n d 3I o , p i ckup s e tt i n g pote n t i ome ters, o n e

c i rcu i t, a nd a fi l l - i n t i mer.

a n output when t h e i n s tantan eous magn i tude o f t h e i nput exceeds i ts fi xed p i ckup

s e n s i t i v i ty.

The output w i l l go away as soon a s t h e i n s ta ntaneous ma g n i tude o f the

i nput g e ts bel ow i ts fi xed d ropout l ev e l , wh i ch i s g re a t e r than 95% of t h e p i ckup

l evel .

The fi l l - i n t i me r w i l l produce a n output a s soon a s a s i g n a l appea r s a t i t s

i nput.

Th i s output wi l l pers i s t un ti l the i nput from the l ev e l - s e n s i n g ci rcui t goe s

away a nd th e adjus tabl e t i me - d el ay d ropout s e tt i n g o n t h e fi l l - i n t i me r exp i res.

GEK-45464