Westinghouse HKB Installation, Operation & Maintenance Instructions Manual

The type
relay
carrier
and ground
line section.
relays at
three cycles or less for all
within the limit s of the
relay
source
Consequent ly, the
a system swing or out-of-step conditions .
carrier equipment operates directly from
station battery .
The HKB carrier relaying system compares the
phase positions of the currents at the ends of
a line-section
determine
fault
energize
single-phase output voltage
combination of sequence component s of the line
curren t .
voltage
allows the transmission
nate half-cycles of the
rent .
terminals in
the opposite
the phase
t
network
in the grid circuit of
larities of
such that for an
flows
cycles.
cuit of the
SUPERSEDES l.l. 41-650F
*Denotes change from superseded issue.
INSTALLATION
INSTRUCTIONS
TYPE
HKB
UNIT (TYPE JY} AND TEST EQUIPMENT
APPLICATION
HKB
relay is a high speed carrier
used in conjunction with
equipment to provide
fault protection of a transmission
Simultaneous t ripping
each line terminal is
relay set t ings.
operates on line current only,
of a-c line potential
relays will not t rip during
PRINCIPLE OF OPERATION
over a carrier
whether an internal
exist s . The three-phase
a sequence network
proportional to a
During a fault, this
controls an elect ronic
of carrier on
power-frequency cur­
carrier is t ransmit ted from both
this manner , and
ends where it is
position of the
output . This
co�parison
a vacuum
the o t ges to be compared are
v l a
fault,
internal
on alternate power-f requency
A relay connected in the
vacuum tube operates
OPERATION
•
RELAY, CARRIER CONTROL
condition to complete the trip circuit . During
an
current
power line
continuously
complete phase
relay does not operate.
of t he
Since this
obtained in
during a fault , the carrier channel is availa­
internal faults ble at all other t imes for the t ransmission of
The other functions.
and no
is required .
The CAUTION
the remove
serted for the
during
parts operate
see
and
and electrical connect ions .
channel to
or external
line currents
which gives a
The rela
tive,
saturating
units, two polar relay units, a telephone-type
single -phase
relay ,
circuit which
operation indicator all mounted in a Type M-20
alter­
Flexitest Case .
line
is received at
W1en
pliE�,
compared with
saturating auxiliary
local sequence
in a
p
takes lac e
tube . po­ the
The
sition .
p
te c�rrent are
la
taps
half­
plate cir­ standard case and the
to
under this
those
MAINTENANCE
•
external fault , the change in direction of
flow causes the plate
blocked , and
relaying system
PART I - TYPE HICB BELAY
Before putting relays into service ,
all blocking which may
purpose of
shipment , make sure that
freely , inspect the contacts to
that they are clean and
operate the relay to check the
CONSTRUCTION
y a
consists cf
and
negative zero sequence
auxiliary t ransformer,
a neon lamp , contactor
t d a
�he
s an r d projection case
the
sequence network,
t ransformer
box which can be located on the rear of
switchboard panel in any
The remainder of the
mounted in the relay
and terminal numbers of the relay in the
external box correspond
type FT
in the case.
EFFECTIVE MAY 1955
I. L. 41-952
current to be
the plate circuit
operat es only
have been in­
securing the parts
all moving
close properly ,
set t ings
co�bin&tion posi­
�
network,
Rectox
two
switch and
is sup­
ani
tap rla�es,
are mounted
convenient po­
relay elements
case proper . The
see Ficures 1,
(