ABB 5HK Series - Electrical Operating Sequence; Ground and Test Devices

IB
6.2
.
1.7
D
Page
12
ABB
ASEA
BROWN
BOVERI
With
the
circuit breaker
open
,
the
closing springs
un
-
charged
,
and the control
power
source
energized
across
disconnects
5
and
02
and
01
and
6
and
motor
disconnect
switch closed
,
operation
occurs as
follows
:
1
.
Immediately
upon
the
availability
of
control
power
at
secondary
disconnects
“
5
”
and
“
02
"
the
spring
charging
motor
(
MOT
)
is
energized
,
which
,
in
turn
,
charges
the
closing
springs
.
When the
closing
springs
are
charged
,
limit
switch
contacts
“
LSb
”
are
opened
,
and
limit
switch
contact
“
LSa
”
is closed
.
Also
,
upon
availability
of
control
power
at
secondary
disconnects
“
01
"
and
“
6
”
and
after
the
closing
springs
have been
charged
,
the lockout
relay
coil
(
Y
)
will
be
energized through
the circuit breaker
auxiliary
switch
“
b
”
contact
and the
parallel
resistors
R
2
and
R
3
.
The
lockout
relay
will
pick
up
and
open
contact
“
Yb
”
and
close
contact
“
Ya
”
.
2
.
Connecting
secondary
disconnects
“
03
”
or
7
”
to
control
via
operation
of
the close control switch
energizes
the latch
release coil
(
X
)
through
the circuit
breaker
auxiliary
switch
“
b
”
contact
,
the
normally
open
lockout
relay
contact
"
Ya
”
,
and the
limit
switch
contact
“
LSa
”
.
The
latch
release coil
(
X
)
releases the
closing
latch
.
The
springs
then
discharge
to
close the
Circuit
breaker
.
3
.
When the
springs discharge
,
limit
switch
contacts
“
LSb
”
close
,
and
limit
switch
contact
"
LSa
”
opens
.
4
.
When
limit
switch
contact
“
LSb
”
in
the
motor
circuit
closes
,
the
spring charging
motor
is
energized
,
which
,
in
turn
,
recharges
the
closing springs
.
5
.
When the
circuit breaker
closes
,
all
auxiliary
switch
“
b
”
contacts
open
and all
auxiliary
switch
“
a
”
contacts
close
.
*
6
.
When
limit
switch
contacts
“
LSb
”
close
,
the lock
-
out
relay
coil
(
Y
)
is
de
-
energized
and
opens
lockout
relay
contact
“
Ya
”
,
which de
-
energizes
the
latch release coil
(
X
)
.
Lockout
relay
contact
“
Yb
”
closes
,
which locks
out
the
lockout coil
(
Y
)
as
long
as
the
“
Close
”
contact
is maintained
.
This is
true
because control
power
maintained
on
secon
-
dary
disconnects
“
03
”
or
“
7
”
with
“
Yb
”
contact
closed
puts
resistor
R
1
in
parallel
with
the
“
Y
”
coil
.
The additional
current
flow
through
R
2
and
R
3
,
and the associated
in
-
creased
voltage
drop
across
R
2
and
R
3
leaves
insufficient
voltage
to
pick
up
the
lockout
relay
The
purpose
of
the
lockout
relay
coil
(
Y
)
is
to
prevent
pumping
of
the
closing
mechanism when
closing
against
a
faulted
circuit
.
7
.
After
the breaker has closed and
when
the
closing
control
switch is released
by
the
operator
,
the lockout
relay
coil
(
Y
)
remains de
-
energized
due
to
the
auxiliary
switch
“
b
”
con
-
tact
in
the
closing
circuit
being
open
.
8
.
The circuit
breaker
can
be
tripped
by
operation
of
a
remote
trip
switch
,
which
energized
the circuit
breaker
trip
coil
(
TC
)
through
the
auxiliary
switch
“
a
”
contact
.
9
.
The
undervoltage
device
,
if
furnished
,
provides
a
direct
acting
lock
-
open
and
undervoltage
tripping
feature
.
This
device
must
be
energized
to
intitially
close the
breaker
,
and
also
to
maintain the breaker
in
a
closed
position
.
10
.
The
latch
check
switch
,
if
furnished
,
ensures
that
the
operating
mechanism
must
be
reset
prior
to
energizing
the
closing
latch release coil
(
X
)
.
11
.
The
remote
mounted
capacitor trip
feature
,
if
furnished
,
provides
an
electrical
energy
storage
network
,
whereby
should
a
loss
of
control
power
occur
at
the
instant
of
a
tripping signal
,
sufficient
energy
will
be
furnished
to
ensure
an
electrical
tripping
operation
.
12
.
The
stopping
device switch
,
if
applicable
,
prevents
electrical
reclosing
of
the circuit breaker
after
a
manual
trip
until the
stopping
device switch has been
manually
reset
.
When
AC
closing
control
power
is
supplied
,
the
circuit
breaker
will
not
reclose unless the
reclosing
circuit
has
sufficient
time
delay
to
permit
the
“
Y
”
coil
to
pick
up
.
Operation
of
accessories
,
when
installed
as
ordered
,
can
affect
electrical
/
mechanical
operations
of
the
circuit breaker
when the circuit breaker is
being
tested
electrically
or
mechanically
,
undervoltage
devices
should be
energized
or
otherwise
mechanically
closed and
mecnanical inter
-
locks
,
key
or
other
,
should he
set
in
the
“
operate
”
position
.
Section
7
.
GROUND
AND
TEST DEVICES
These devices
are
supplied
when ordered
and
are
basi
-
cally
three
design
types
,
with
certain
component
variations
such
as
test
ports
and interlocks
.
-
Simple
,
three
-
terminal
,
non
automatic
.
-
Simple
,
three
-
terminal
,
electrically
operated
.
-
Complex
,
six
-
terminal
,
electrically
operated
with
manual
selector
switch
.
These devices
are
basically
maintenance
free
for
their
normal
operating
life
.
Racking
procedure
is the
same as
for
the
basic
circuit
breaker
as
outlined
previously
,
and all
detailed
operational
instructions
are
attached
to
the individ
-
ual devices
.
Courtesy of NationalSwitchgear.com