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TYPE HKB RELAY AND CONTROL UNIT
CONTACTOR S'ltiTC
LOWER CONTA.CT
N�ON L A M P
FORPHA.�E
A_ B.,
ROTA TION
C
3 W INDING
MUTUAL REA.C.TOR.
1 3 -D- 5784
Fig. 1-Internal Schematic Of The Type HKB Carrier Relay
In The Type FT Case.
2 , and 3 ) .
Terminal s 1 8 , 1 9 and 20 of the ex
t e rnal
box are to be
sp onding t erminal s o f the
ard c as e .
Otherwi s e , all external c onne c ti ons
for the relay in the
s t andard pro je c t i on case
or
in the typ e
FT case are made to the
terminal s .
Sequen c e Network
The
currents
from
s e c ondar i e s are p a s s e d thru a network con s i s t
ing
o f a three -winding
two r e s i s t or s .
The
z ero - s e quenc e
R 0 , c ons i s t s o f three resi s t or tub e s t app e d t o
obtain
sett ings
f o r
c onditions .
The other r e s i s t or R 1 is a formed
s ingle wire
mount e d on the rear of the
sub -b a s e .
The output of thi s network provides
a vol tage acro s s the primary of the saturating
transformer .
The l ower
t ap b l ock provides for adjus tment
of the relat ive amount s of the p o s i t i v e , nega
tive
and zero s equenc e
in the network
output .
2
�
---- -- -
OPERA TION INDICATOR
FULL
WAVE
REC. TI FIE.R'5
A D J LINK
UPPER POL�R
R.E..l. ..A. YELEMILNT
IOO ..A..
RI!.LAV
-LOWER POLAR
E.LE.ME.NT
SATURATING
TRANSFORMER
HANDLE
SHOR TCIROJ\1' SWITcH
RI!! D
TO RELAV
URRE.NT TEST JAC.K
TO BASE TERMS
c onne c t e d t o the c or're
relay i n the stand
same
the current transformer
iron-core reac t or and
r e s i s t o r ,
various
ground
fault
rel ay
c omp onent s of current
Thu s , a
s ingl e rel ay
RECTI FIE�!
FULL WAVE
RE.A.R VIEW
Fig. 2-Intemal Schematic Of The Type HKB. Carrier Relay
In The Standard Projection Case.
e l ement energ i z e d from the network c an b e used
as a fault det e c t or for al l typ e s of
Saturating Aux i l i ary Transformer
The voltage from the network i s fed into the
t app e d
primary ( upper
s aturating transformer .
a neon l amp conne c t e d acro s s
u s e d
t o l imit
the
voltage
fault det e ct ors ( p o l ar rel ay
c arri er
c ontrol Uni t , thus
range
of
vol t age for
maximum t o
minimum fault current s .
vides high operating energy
a nd
l imit s
the
operating
faul t s to a reas onab l e value . .
The upp er
t ap
p l at e change s the
the s aturating
transformer , and
amp eres
required to
p i ck up the
detector el ement .
For further discussion, s e e
s e c t ion ent i t l e d , " s e tting s " .
Rectox Unit s
The s e c ondary
o f the saturati ng transformer
feeds a bridge - c onne c t e d Rectox Uni t , the out
put of
whi ch energ i z e s the polar fault det e c
t o r e l ement s .
A s e c ond Re c t ox , energ i z e d from
the output of the Control Unit , supp l i e s a d-e
voltag e
t o the t e l ephone
operate s only for an
internal faul t .
ONTA.CTDR
SWITCH
...
PER
TION INDICATO R
1 3 -D- 5903
.S.WITCH
TE!>T
faul t s .
tap p l at e ) of
a small
transformer a nd
Thi s
it s s e c ondary are
impre s s e d o n
the
e l ement s ) and the
providing a small
a
l arge
variation of
Thi s pro
for l ight faul t s ,
energy
for heavy
output o f
i s marke d in
l ower fault
rel ay e l ement which
The use
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