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CARRIER RELAYING
A
B
C
Fig.
relay ) ,
and
the
ilelf.
2.
A d-e operated,
mitter-receiver
HKB
type
Control Unit.
is energized
from
relay
sequence
functions, as follows:
a.
To control the transmission of
cycle blocks of carrier.
b.
To rectify
the received
blocks
of
carrier from the distant
transmitter.
c.
To compare the phase position of the
received carrier
quence
filter output
whether or not the relay should trip
the breaker.
3.
A
coupling
capacitor with carrier aux-
2
-
--
- - - ---
----
-
-
i
·
1
L---------------�
STATION
BUS
1-Basic Schematic Connections Of The Type HKB Relaying System.
operating element it
JY
type
carrier trans
which
also
includes a
The control unit
the
output
of
the
filter,
and
has threE
half
half cycle
and
the local se
to
determine
RECEIVER
-----
_jf _ -,
-
_
R.F. CHOKE
1
r------ ----
1
I
1
HKB
r
RELAY
I
I
iliary for introducing
quency
on
to
This
may be
device for
obtaining line-to-ground po
tential for synchronizing or 3 sets used
for
measuring 3 phase
The carrier
Coupling
type PC, and with
is the type PCA.
not required for the type
4.
A Line Coupling
used
to
tune
actance
of
the coupling capacitor
match
the
transmitter
cuits to the transmission line.
tuner
may be part
when the transmitter receiver is mounted
out doors.
It
mounted near the coupling capacitor when
the
transmitter-receiver
indoors some distance from the tuner.
±
r-HKB CONTROL
UNIT
I
I
I
I
_I
TRIP
COIL
+
the carrier fre
the
transmission
line.
supplied
with a potential
line
potential.
Capacitor is
the potential device,
The line
potential is
HKB
relay.
Tuner.
This
unit is
out
the
capacitive re
or
receiver cir
The
of' the
carrier
is
usually
separately
is
located
the
and
set
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