Westinghouse RS Instructions Manual

INSTALLATION
INSTRUCTIONS
TYPES RS AND RSN CARRIER AUXILIARY RELAYS
CAUTION
Before putting
to service, remove all blocking which may have
been inserted for the purpose of securing the
parts during shipment,
moving parts operate freely, inspect the con­
tacts to see that they are clean and
properly, and operate the relay to check the
settings and electrical connections.
APPLICATION
The type RS relay is an auxili a ry relay used
in the carrier relaying
prevent instantaneous tripping for faults ex­
ternal to the line section to which it is ap­
plied and to permit instantaneous simultaneous
tripping for internal
arranged to respond to indications of
power and direction provided by the phase and
ground relays, thereby controlling the trans­
mission of the carrier signals.
to grounC faults may be given preference over
the response to phase faults.
The type RSN relay is identical to the type
RS except that it includes additional blocking
elements to prevent
step system conditions.
prevent or delay instantaneous fault tripping
during out-of-step conditions excep t for three
phase faults. Three phase
during out-of-step conditions can be cleared
by tripping after a short time delay.
For type HZ carrier relaying either the RS
or RSN relay may be used depending on applica­
tion requirements. With
relays, however, the
out-of-step blocking
used. The HZM relay is
not trip for power
system can recover without going out-of-step.
If the system dpes go out-of-step,
may be desired. To meet this
SUPERSEDES I. L. 41-603. 8
(New Number-No Changes)
I. L.
WITH GROUND PREFERENCE FOR
PLATE KEYED CARRIER SETS
protective relays in­
make sure that all
close
scheme to block or
faults. The relay is
fault
The response
tripping due to out-of­
These elements do not
faults occuring
type HZM distance
RS relay, which has no
facilities, is always
set so that it does
swings from which the
tripping
requirement, a
OPERATION
•
separate impedance-type out-of-step
relay is used. The
the RSN cannot be
of the HZM relay is set with its maximum reach
opposite to that of the Z2 element.
CONSTRUCTION AND OPERATION
The type RS or RSN relay consists of direc­
tional auxiliary, receiver and alarm elements,
contactor switches
In addition, the type RSN relay contains three
voltage elements, a combination pendulum and
time-delay drop-out relays which are the out­
of-step elements. The construction and opera­
tion of the relay
below. Complete details
this relay in the carrier relaying scheme is
described in I. L. 41-600.6.
Directional Auxiliary Elements
These are two
switches designated
plunger of the contact or
spring leaf arm with a silver contact surface
on one end and rigidly fixed to the frame on
the other end. The stationary contact is also
fastened to the frame and in the deenergized
position the contacts are held closed by the
leaf spring. When the coil is energized, the
plunger travels upward breaking the contacts.
The CSP switch is energized by the
of the directional
ment of the phase relays, and the CSG switch,
by the operation of the directional and over­
current elements of
back contacts of the two switches are connect­
in the
ed in series
cathode circuits. The operation of either of
these switches opens up the cathode circuit to
stop carrier and to open the short around the
EFFECTIVE FEBRUARY 1955
I. L. 41 -921
MAINTENANCE
•
tripping
out-of-step elements of
used since the Z3 element
and operation indicators.
elements are described
of the operation of
solenoid type
contactor
as CSP and CSG. The
switch operates a
operation
and second impedance ele­
the ground relay. The
oscillator and amplifier