Description - GE SLY81 A Instructions Manual

STATIC, THREE PHASE DIRECTIONAL PHASE DISTANCE RELAY
The Type SLY81A
s t a t i c pha s e d i s tance
he r t z , f i ve ampe r e s
he r t z, one ampe r e
ava i l ab l e w i t h con t i nuou s l y adju s t a b l e ohm i c r e ach r an g e s o f 0 . 1 t o 4
ohms pha s e - to- neu t r a l
ampe r e ( 1 amp )
0 . 5 t o 2 0 ohms
ava i l a b l e a r e 48,
a n e x t e r na l p r e - r e g u l a t o r .
( t wo c on t a c t s each w i t h
f o r a ux i l i a r y f u n c t ions .
doubl e - e nded d r awou t ( L 2 D ) case .
The Type SLY8 1 B i s s im i l a r to
a n ou t - o f - s t ep
co nd i t i on, ope r a t e s
con t r ol l i ng a n aux i l i a r y r e l ay .
The Type SLY8 1
p r o t e c t i o n s c heme
p r o t e c t i o n . I t may a l s o b e us ed a s a n u nde r r e ach i ng o r ove r r e a ch i ng
t r i pp i ng r e lay i n a ny o f t he d i r e c t i onal
d i r e c t i o nal compa r i s on
t h e Type SLY8 2A block i ng r e l ay
u s ed to co- o r d i na t e w i t h the SLY8l t r i pp i n g r e l ay .
The SLY81
p r ov i d e s an opt imum accommoda t i on o f a r c r e s i s tance .
The f u n c t io na l
c o n n ec t i o n s f o r
r e spe c t i v e l y . Typ i c a l ex t e r na l conne c t ions a r e shown i n F i g u r e 4 .
These instructions do not purport to cover all details or variations in equipment nor provide for every
possible contingency to be met in connection with installation, operation or maintenance.
information be desired or should particular problems arise which are not covered sufficiently for the purchaser's
purposes, the matter should be referred to the General Electric Company.
To the extent required the products described herein meet applicable ANSI, IEEE and NEMA
standards; but no such assurance is given with respect to local codes and ordinances because they vary greatly.
GE K-49861
TYPES SLY81A AND SLY81B

DESCRIPTION

r e lay i s
r e l ay .
( 5 amps ) ; 5 0 he r t z,
( l amp ) . F i ve
o r 0 . 7 5
r a t ed r e l a y s a re ava i l a b l e w i t h ohm i c
o r 3 . 7 5 t o 1 5 0
1 1 0, o r 1 2 5 .
Con t a ct outpu t s a r e p r ov i ded f o r
t a r g e t )
The r e lay i s mou n t ed i n a deep,
b l o ck i ng c i r cu i t,
a norma l l y
r e l ay s may
a s th e f i r s t,
s c heme s
r e la y ha s a "va r i able
b lock d i ag r am
the SLY81A a n d SLY8 1 B
a t h r e e pha s e,
It i s ava i l a b l e
f i ve ampe r e s
ampe r e ( 5 amps )
t o 3 0 ohms pha s e - t o- n eu t r a l .
ohms . DC
A 2 5 0 vol t r a t i ng
and a con t a c t
Type SLY81A e xcept t h a t
MOB, wh i c h
open output
b e u s ed i n
s e cond o r
compa r i s on s cheme s .
u s e pha s e d i s t a n c e
( i ns t r uc t ion book GEK- 4 98 6 2 )
mho''
i s shown i n
a r e s hown
3
f i r s t o r s e c o nd
w i t h r a t i ng s
( 5 amp s ) ;
r a t ed r e l a y s
r each r a n g e s o f
Powe r s uppl y vo l t a g e s
i s ava i l ab l e w i t h
t r i pp i ng
conne c t ed t o pos i t i v e
l a r g e s i z e,
i t c o n t a i ns
du r i ng an o u t - of - s t ep
con tac t s u i t a b l e
a " s t epped d i s t a nc e"
t h i r d z o n e o f
b l oc k i ng
characteristic,
shou l d be
F i g u r e 1 . I n t e r na l
i n F i g u r e s 2
Should further
z o ne
o f 6 0
and 5 0
a r e
On e
f o r
pha s e
I f t h e
r e l ay s,
which
a nd 3