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Reclosing Relay Type
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Fig.
6 (362A6l3-7) Sequence :Diagram
for
Type
ACRllB
and
ACRllE
Reclosing
Relays
position
under
the influence
of
the charged
reset
"pring. During the
reset
cycle the escapement
lllower
retards
the motion of the
star
cam,
re-
.ucing the
reset
speed to a point where
there
will
be
no
rebound when the
reset
position
is
~eached,
The clutch
release
unit
is
equipped with a
seal-in
contact to shunt the
reset
contact "MN" during the
reset
cycle. A manual
release
rod
is
provided to
permit
releasing
the clutch from the front
of
the
relay
so
that
the
gear
train
can be turned
by
hand.
OPERATION
The functions
of
the
various
components
des-
cribed
above
are
illustrated
by Fig. 3 which shows
an
elementary
diagram
of a typical
circuit
utilizing
the Type
ACR
recloslng
relays.
The diagram shows
the connections
for
an
imnedlate
Initial
reclosure
followed by one
or
more
delayed
reclosures.
All
contacts
In the
recloslng
relay,
Identified by the
device function number 179,
are
shown
In
the
posi-
tion they
assume
with the
relay
in Its
reset
position.
When the
relay
ts
connected
for
immediate
initial
reclosure,
it
is
essential
that, with the
relay
in
its
reset
position, switch "AB-BC" be held in Its
operation
position
by one of the
"E"
cam
projection
("AB" closed, "BC" open). This setting Is
des-
cribed
more
fully under ADJUSTMENTS.
IMMEDIATE
INITIAL RECLOSURE
When the
circuit
breaker
trips,
the 179Z unit
Immediately energized through the 152b the 101-5
_ontact,
and the
"preclosed"
contact 179E1. When
the 179Z unit
operates
it
seals
itself
In
around the
the 179E1 unit and
also
energizes
the 179E
"operate"
coll through the 179E6 contact. The operation
of
the 179E unit
causes
the 179E5 contact to close,
thus completing the
circuit
to the closing
relay
152X
through the
seal-In
contact 179Z1. The operation
of
the 179E unit
also
opens the 179E1 and 179E6
con-
tacts.
It
further
sets
up
the
reset
circuit
through
179E2 and
starts
the timing motor through the 179E3
unit.
With this
arrangement,
the operating time of the
179Z and 179E units
Is Included in the total
re-
closing time of the
breaker.
The
initial
reclosure
can be initiated
directly
through the
"preclosed"
contact 179E1,
If
the 179E5 contact Is by-passed,
by placing a
jumper
between
terminals
18
and 19.
When the
breaker
closes, the 152b contact
opens, and the 179Z unit will drop out when 152X
"a"
opens, thus providing an anti-pump
feature.
As soon
as
the
motor
starts,
contact "AB" will open
and
"BC" will close, setting up the
circuit
for
subsequent delayed
reclosures
In
the
event
that
the
first
reclosure
Is unsuccessful.
RESET
A
short
time
after
the
start
of the timing cycle
contact"MN"
Is
operated
by the Single-ended
cam
"E"
as
previously mentioned.
If
the Immediate
Initial
reclosure
was successful, the 152al switch
will be
In
Its
closed
position and the clutch
release
unit 179R will be energized through the contact
179E2. During the
reset
Interval, the 179R unit
is
sealed
In
arOund the "MN" contact. When the
reset
position Is reached, the "DE" contact
will
close,
9
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