Westinghouse RC Installation, Operation & Maintenance Instructions Manual

TYPE RC AUTOMATIC RECLOSING RELAY
CAUTION Before
putting
remove all blocking
serted for the purpose of securing the parts
during shipment, make
parts operate freely, inspect the contacts to
see that they are clean and close
and operate the relay
and electrical connections.
APPLICATION
The type RC automatic
used for automatic reclosure of AC or DC elec­
trically operated circuit breakers after they
have been opened by overcurrent or other pro­
tective relay action.
justed to provide several reclosures at pre­
determined time intervals, so that in case the
breaker does not remain closed after the first
reclosure additional reclosures will be made.
The first reclosure
taneous reclosure through
since system operating
that the majority of faults are of a temporary
nature, such as lightning flashovers, and will
not be re-established
the fault current. Consequently, service in­
terruption can be minimized by the use of in­
stantaneous first reclosure.
first reclosure may be delayed if desired.
In case the circuit breaker does not remain
closed after the first reclosure,
will make additional
graded intervals. It is common practice
make two additional reclosures, but the relay
may be adjusted to make any number up to
total of six reclosures if desired.
breaker does not remain closed after the final
reclosure, the timing
"Lockout" position, and
at reclosure must be made by manual operation
NEW INFORMATION
INSTALLATION
INSTRUCTIONS
WITH INSTANTANEOUS TRIP LOCKOUT
relays into service,
which may have been in­
sure that all moving
properly,
Je
to check t settings
reclosing relay is
The relay may be ad­
usually is an instan­
preclosed contacts
experience has shown
after interruption of
However, the
the relay
reclosures at suitably
to
a
If the
drum stops in the
any further attempts
OPERATION
•
of the control switch.
breaker remains closed
reclosure, or, subsequently,
reclosure, the relay timing drum will advance
to and stop at the "Start" position, where the
relay is in readiness for another cycle
automatic reclosures following the
ping of the breaker.
For any automatic reclosing application, the
de-rating factors for
ability should be
particular reclosing cycle.
instantaneous first
that the protective relays open their contacts
within 10 cycles
or less after the breaker is
tripped in order that the trip circuit will be
de-energized before
Full advantage of minimum service interruption
permitted by use of
closure will not be
plants unless proper application is made
the customer's apparatus of such under-voltage
time delay, field removal, and
motor unloading devices as are necessary.
CONSTRUCTION
The type RC relay
synchronous motor operated timing
instantaneous relay
relay element which has optional provision for
a slight time-delay on pick-up and has a latch
which holds its contact actuator
mediate position after its
gized. The latch is
by the timing element
justable interval following de-energization of
the latching element coil.
the requirements of
certain modifications or auxiliaries have been
developed also.
I. L. 41-31.0.1
MA INTENANCE
•
However, if the
after any automatic
after manual
of
next trip­
breaker interrupting
checked when choosing any
Also, when using
reclosure it is necessary
reclosure takes place.
instantaneous first re­
realized in consumer
on
synchronous
OPERATION
AND
consists basically of a
element, an
element and a second
in an inter­
coil is deener­
released mechanically
at the end of an ad­
In order to meet
special applications,
EFFECTIVE JULY 1952