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TYPE HKB RELAY AND CONTROL UNIT
A
B
c
3 W / N O / N "
MVT V AL RE ACT OR
TOP VIEW
F OR P H ASE
I?OT AT /ON A, B,C
Fig. 3 - Internal Schematic Of The Sequence Network
Used With The Type
Projection Case.
of s ensit ive p o l ar relay keeps down the energy
required from the current tran s f ormers .
P olar-Type Relay s
The s e
el ements
c on s i st
shap e d
magne t i c frame ,
magnet , and an armature with a
p e rmanent
o f
c ontac t s .
The
magnet
c l amp
dire ctly
magnet i c frame . Flux from the permanent magnet
divi d e s
int o two
p aths , one
air
gap at the
front of the el ement in whi c h
t h e armature
i s l oc at e d , t h e other acro s s two
gap s at the b a s e of the frame .
s c rew
t y p e
shunt s whi c h
s c rews
are l o cated acro s s the
The s e
change the
reluc t ance
p ath s o as t o force
s ome of the flux thru the
moving
armature which is fastened t o the l e af
spring
and attached to
tween
t h e
two rear
armature
p ol ar i z e s i t
b i as
c aus ing
i t t o
other of the p ol e s , depending up on the adjus t
ment of the magnetic shunt s crews .
A
c o i l i s
p l ac e d
within the magnet i c frame .
fl ows
in the coil
produc e s a
which
opp o s e s the
p e rmanent magnet f i e l d and
3 .RES/STOH
TU BES
1 3 - D - 5952
HKB
Relay In The Standard
of
a
r e c t angular
an
e l e c t romagnet ,
s e t
p o l e s
of
the p ermanent
to each
s i de of
the
p at h acro s s the
Two a d justab l e
require
n o l o cking
rear a ir gap s .
of the magnetic
the frame mi dway
b e
air gap s .
Flux i n
the
and creat e s a magnetic
move
toward one or
the
around the armature
and
The
current which
magnet i c f i e l d
acts to move the armature in the contac t - c l o s
ing dire ction .
C ont actor Switch
The d-e
contactor switch
small
s ol enoid type
plunger
with
a
l ower
end moves i n t h e
A s
the
p lung er
bridg e s three s i lver s t ati onary contac t s .
coil
is i n
s e ri e s with the main
the
relay
and
with
breaker .
When the
coil
b e comes energ i z e d
c ontac t s .
Thi s shunts the main relay c ontac t s
thereby reli eving them o f the duty o f c arrying
tripp ing
current .
c l o s e d unt il the trip c i rcuit is op ened b y the
auxil i ary
switch
t ac t or
switch
i s e quipp e d with a third p oint
which
i s conn e c t e d to a t erminal on the relay
t o operate a b e l l al arm .
Operation Indi c ator
a
The
operation indi c at or is a small s o l enoid
coil conne c t ed in the
coil is
energi z e d , a
ture
releases the whi t e target wh ich fal l s by
gravity
to indi c a t e
c ircuit .
The
indi c at or is reset from out s i de
of the c a s e by a push ro d .
CHARACTERISTICS
The overall operat ing
HKB
relay
and c arri e r
Figure
4 .
Thi s
operating relay el ement
p l o t t e d ag ainst the phase angle difference b e
t w een the fault
current s a t
the l i ne .
A s indicated, the operat i ng el ement
will trip
when the
60 °
proximat ely
from the in-phas e , or
fault c ondition .
c ircui t s operate under
the
shape
of
thi s
materially
over a
rent s .
in the rel a y i s a
swit ch .
A
cylindrical
s i lver
di s c
mount e d on i t s
c ore ol' t h e s o l enoi d .
travel s
upward ,
the
c ontac t s of
the
trip
c o i l of
re l ay contac t s
c l o s e , the
and c l o s e s the switch
The s e
c ontac t s
remain
on the
breaker .
The
trip circui t .
When the
spring-restrained arma
comp l e t i on
of the
characteri s t i c of the
equipment is
shown in
shows
the
current
in
(
t e l ephone -typ e relay
opp o s i t e ends o f
phase ang l e
departs
through
As the
e l e ctronic
c ontrol
a saturat e d c ondit ion,
curve
will
not
change
wide
range of
fault cur
di s c
The
the
c on
trip
the
)
ap
3
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