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TYPE HKB RELAY AND CONTROL UNIT
approximately two
time s the
current setting or the HKB relay as previously
de termine d .
OPERATION
A
mult i - c ontact
switch i s
line
t erminal which serves the dual func ti ons
or a c arrier on-off switch
T h i s switch
i s
arranged
phase
current to the
internal and
through fault c onditions .
operation i s
noted by
di c ating lamp
c onnec t e d in the HKB relay trip
circuit .
During the
test the HKB
cuit to the l ine breaker is
warning
l ight is energized through
c onta c t s on the test swit ch .
Use of the auxiliary test equipment i s to be
l imited to provide a simp lified test after the
init ial instal l ation t e s t s have b een performed
as
described in
p art II of this
leaflet .
The
test app aratus
shown in
Fig .
1 2
with
transformers energi zed from 1 1 5 vol t , 60 cyc l e
p ower
s ource s a t each
in phas e with each other .
ation pro c edure as sumes that the same polarity
is used in c onnecting the test transformer
each line terminal .
1 .
Turn
the
c arrier test
line terminal s to CARRIER OFF .
2 .
Turn the c arrier test
at l ine terminal #1 .
22
phase -to -ground
provided at each
and a test swit ch .
to
apply
a single
HKB relay to
simulate d
Relay
observing
a blue
in
trip
c ir
op ened and a
red
auxiliary
instruct ion
i s to
b e
c onnected a s
the auxil iary
t e s t
l ine terminal that are
The foll owing op er
at
switch at
b oth
1
switch to TEST
The l o c al relay
shoul d
op erate to transmit
half cycle impul ses
Tripping wil l b e indi c at e d
c arri e r , and trip .
by the blue l ight .
3 .
Turn the HKB
test switch a t the
line
terminal
#2
to
simulate an int ernal fault
t erminal s .
The relay at line t erminal #2 wi l l
trip , and the
relay a t l ine
remain trippe d .
Tripping wil l b e indic ate d b y
the
blue l ight s
a t
each
c arrier wil l b e
transmitted in half cycle im
pul ses simul taneously from
line .
4 .
Reset the HKB test switch at l ine t ermi
nal #1 .
The
relay at terminal #1
and
turn
orr the
b lue
t erminal #2 wil l hold i t s trip c ontact c l o s e d ,
l ighting the blue l ight .
5 .
Turn the HKB
test swi t ch at l ine t ermi
nal #1 to
T EST 2 .
Thi s
late an external
faul t . The
both
rel ay , wil l b e held
l ight wil l b e extingui shed .
6 .
Reset
the
test
t erminals to CARRIER OFF
CARRIER ON for normal s ervi c e .
to turn in ON po sition .
This c ompletes the test procedure .
Component S tyl e N umbers
S#l 338284
Test Transformer
w
8 #1584284
Test switch
Type
moun ting .
S#l 584285 for 1 -1/2" p anel
Test Switch
Typ e
W
moun ting .
o f
remote
TEST 1 .
Thi s
will
fed from b oth l ine
terminal #1 wil l
l ine
t erminal .
each
end
of
the
wil l reset
l ight .
The relay at
condition wil l simu
trip cont a c t s of
open
and
the b lue
switches at
b oth l ine
b e fore returning
to
Push in handl e
for l/8 " p anel
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