GE K-49861
sol i d s t a t e c i r cu i t r y of the r e lay and the i nput DC con t rol powe r
( i . e . , s t a t ion ba t t e r y) .
A yel low LED mon i tor s the ou tpu t vo l t age
f r om t h i s i n t e r na l power supply .
Type SLY8 lB has an add i t ional MOB funct ion wh i ch de t e c t s an out
of- s t ep cond i t ion and ope r a t e s a norma l ly open ou tpu t con tac t .
The
c i r cu i t r y fo r t h i s fu nct ion is located on the SP c a r d .
The
i n t e r na l
connect ions
and
card
layou t s fo r
each
pr i nt e d
c i r cu i t ca r d a r e l i s t ed i n Table X .
The p r i n t ed c i r cu i t c a r ds have
t e s t poi n t s acce s s ib l e from the front of the ca r d s .
Each t e s t po i n t,
except the r efer ence connec t ion "OV" on the PS card and AIN, BIN, and
CIN
on
the IT ca r d,
is
buffe r ed
by
a
r e s i s tor
to p r ev e n t
a
d i s tu rbance to the c i r cu i t r y if a t e s t poi nt i s acc i dent a l l y s ho r t
c i r c u i t ed .
The t e s t po i n t s a r e labeled func t iona l ly;
i . e . t he AB
pha s e i nput to the i n t eg r a t i ng t ime r i s labe l ed "AIN" .
The i n t e r na l
connect ion d r awings show the t e s t po i n t s w i th the same labe l .
TABLE X
INTERNAL CONNECTIONS FOR CARDS
FIGURE NUMBER
FIGURE NUMBER
CARD DESIGNATION
CARD FUNCTION
OF INTERNAL
OF CARD LAYOUT
CONNECTIONS
SP
Signal Processing
12A
12B
(Type SLY81A)
SP
Signal Processing
13A
13B
(Type SLY81B)
CP
Combined Polarizing
14A
&
14B
14C
OS
Operate Signal
15A
&
15B
15C
CL
Coincidence Logic
16A
16B
IT
Integrating Timer
17A
178
PS
Power Supply
18A
188
( 110-125 Volts DC)
PS
Power Supply
19A
198
(48 Volts DC
CALCULATIONS OF SETTINGS
A s s ume that the l i ne to be prot ected i s app rox ima t e l y 7 0 m i l e s
long and has p r ima r y impedances as fol lows:
Z l
=
42L8 3°,
As sume CT r a t io i s 1 0 0 0/5 and PT r a t ion i s 2 0 0 0/l .
1000
1
Z1 = 42(
--
) (--)
=
4.2 L83°
5
2000
13
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