Calculations Of Settings - GE SLY81 A Instructions Manual

Static, three phase directional phase distance relay

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Table Of Contents

Table of Contents

sol i d

s t a t e

c i r cu i t r y

( i . e . ,

s t a t ion

f r om t h i s i n t e r na l pow e r supply .

Type SLY8 lB has a n add i t ional MOB funct ion wh i ch de t e c t s a n out

of- s t ep

cond i t i on

c i r cu i t r y fo r t h i s fu n c t ion is located on t h e SP c a r d .

The

i n t e r na l

c i r cu i t ca r d a r e

t e s t po i n t s a cce s s ib l e f r om the f r ont of the ca r d s .

e x c e p t t h e r ef e r ence conne c t ion "OV" on the P S c a r d and AIN,

CIN

o n

t h e

d i s t u rba n c e

c i r c u i t ed .

The

pha s e i np u t

to the i n t e g r a t i ng t i me r

con n e c t ion d r a w i n g s show the t e s t po i n t s w i th the s ame labe l .

CARD DESIGNATION

A s s ume

t h a t

long and has p r ima r y i mpedances as fo l lows:

Z l

42L 8 3°,

A s s ume 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 .

GE K-49861

the

ba t t e r y) .

y e l low

and ope r a t e s

conne c t ions

l i s t ed

i n Tab l e X .

ca r d,

buffe r ed

the

c i r cu i t r y

t e s t

po i n t s

a r e

INTERNAL CONNECTIONS FOR CARDS

CARD FUNCTION

Signal Processing

(Type SLY81A)

Signal Processing

(Type SLY81B)

Combined Polarizing

Operate Signal

Coincidence Logic

Integrating Timer

Power Supply

( 1 10-125 Volts DC)

Power Supply

(48 Volts DC