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Tabl e IV l i s ts the ra t i n gs o f the el ectromechan i ca l ta rge ts
0. 2 a nd 2 . 0 amp taps that a re ava i l abl e.
TAP
SETTING
2 . 0
0 . 2
SURGE WITHS TAND CAPABILITY
The S B C rel ay w i l l
i nco rrect ope ra t i on o r dama ge to any compon e n t.
The test vol ta ge wa v e fo rm co n s i s t s o f a h i gh- fre qu e ncy damped osci l l a t i o n w i th a
frequ ency o f 1. 5 MHz.
(
i n i t i a l
v a l u e
ze ro to peak
e n v e l ope o f t h e wave form d ecays to h a l f t h e i n i t i al
m i cros eco nds.
The te s t vol ta ge i s appl i ed be twe e n rel ay s u rge ground a nd each o f
the o t h e r rel ay termi n a l s.
CAPACITANCE CHARGING CAPABILITY
S ta t i c rel ays w i t h co n tact o u tputs o fte n h a ve capaci to rs pl aced i n pa ra l l e l w i th t h e
co n tacts.
The pu rpo se o f the s e capac i tors i s to pro tect the s ta t i c rel ays from
s u rges t h a t may be coup l ed to the w i re s co n nected on the co n tact o u tpu t s.
con tacts a s s oc i a ted w i t h s ta t i c l i n e rel ays may h ave the se capac i tors.
sw i tch es a re pl aced
)
exampl e
t h e cl o s i n g o f these sw i tches w i l l cau s e prev i o u s l y u ncharged capac i tor s to
cha rge, t h ro u gh t h e breake r- fa i l u re re l ay i nput ci rcu i t.
i nco rrect
ope ra t i on
employed a nd th e cu r re n t de tecto rs a re set below full loa d curre n t.
The S B C rel ay, h owev e r, i s des i g n ed s uch tha t the s e a l - i n c i rcu i t, a nd t h u s the S B C
o u tpu t co n tacts, w i l l n o t ope ra te i f two fu l l y- d i scha rged capac i to rs o f e q u a l v a l u e
a re cha r g ed i n to th e con tact i n i t i a t i on i npu t a t s tud 17 .
ba ttery co n n ec ted to s t u d 18, a nd two capac i to r s co n n ected i n s e r i es w i th t h e i r
cen te r po i n t g rou nded to rel ay s u rge g ro u nd, and wi th o n e e nd o f t h e capac i to r s
co nn ected t o s t u d 1 7 a nd t h e o th e r e nd o f the capaci to rs co n n ecte d th rou g h a sw i tch
to pl u s ba ttery, th e i n s ta n ta n eo u s tri p u n i t o f the S B C re l ay w i l l n o t ope rate when
the sw i tch i s cl osed.
ra t i n g o f t h e powe r s uppl y, a n d a re l i s ted i n Tabl e V.
POWER SUPPLY VOLTAGE RATING
GEK-45464
TABLE IV
OPERATING RANGE
(
)
AMPS
2
- 3 0
0. 2 - 3
w i t h s ta nd the test v o l ta ge wa v e fo rm d escr i be d be l ow w i thou t
The sou rce has a n i n ternal
)
i s 2 5 00 vol ts, a nd the damp i n g i s s uch t h a t t h e
i n s e r i e s w i th t h e B FI co n tacts
i n
some
breaker- fa i l u re
The l i m i t i n g val u e s of the capac i to rs d epend on the vol ta g e
TABLE V
48V
125 V
2 5 0V
TRIP DUTY
(
)
AMPS
3 0
3
i mped a nce o f 15 0 o hms.
v a l u e
(
D C powe r sw i tch e s, a s a n
sch emes,
i f a
10
(
)
T 1 a nd T2
o n bo th the
DC RESIS TANCE
(
)
OHMS
0. 13
7 . 0
(
)
1250 v o l ts
i n 6 . 0
T h e B FI
If any
Th i s cou l d re s u l t i n a n
s e a l - i n
c i rcu i t
Tha t i s, w i t h m i n u s
CAPACITOR
The
i s
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