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C A U T I O N
Before putting relays into s ervic e , remove all
blocking which may have been inserted for the pur
pose
of securing the parts during shipment, make
sure that all moving parts operate freely, inspect the
contacts to see that they are clean and close properly;
and
operate
the
relay to
electrical connections .
A P PLICATION
These induction overcurrent relays are used to
disc onnect circuits or apparatus when the c urre nt in
them
exceeds
a
given
station
battery
is
available ,
type relay in conjunction with a-c series trip coil is
used to trip the circuit breaker.
CONT E NTS
This instruction leaflet applie s to the following
types of circuit opening relays:
Type CQ- 2 Short Time Relay
CQ-5 Long Time Relay
C0-6 Definite Minimum Time Relay
C0- 7 Moderately Inverse Time Relay
C0-8 Inverse Time Relay
C0-9 Very Inverse Time Relay
C0- 1 1 Extremely Inverse Time Relay
CONSTRUCTION AND O P E RATION
The type CO relays consist of an overcurrent
(IIT)
unit (CO), a de-ion contactor switch ( CS) , an opera
tion indicator (OI) and an indicating instantaneous
trip
when required.
ELECTROMAGNET
The electromagnets for the types CQ-5 , C0-6,
co-7, C0-8 and C0-9 relays have a main tapped coil
located on the center le g of an " E " type laminated
structure that produces a flux which divides and re
turns through the outer legs.
the flux through the left leg to lag the main pole
SU P E R S ED E S I . L . 4 1 - 1 03D
* D enotes change from s u p e rseded i ss u e .
I N STA L L A TI O N
I N S T R U C T I O N S
TYPE CO CIRC U I T OPEN I N G
OV ERC U R R E N T RE L AY
check the
settings and
value .
When
no
suitable
the circ uit opening
A shading coil causes
Westinghouse
•
O P E R A T I O N
flux.
The out-of-phase fluxes thus produced in the
air gap cause a contact closing torque.
The
electromagnets
C0- 1 1 relays have a main coil consisting of a tapped
primary
winding
and a
identical coils on the outer legs of the lamination
structure are connected to the main c oil secondary
in a manner so that the combination of all the fluxes
produced by the electromagnet result in out-of-phase
fluxes
in the air gap.
fluxes produced cause a contact closing torque .
DE-ION CONT/1CTOR SWITCH (CS)
This
switch is
a small a-c
whose
coil is energized from a small transformer
connected in the main current circuit.
plunger
operates a
spring leaf
contact surface on one end and rigidly fixed to the
frame at the other end.
The
overcurrent unit contacts are in the con
tactor switch coil circuit and when they close, the
solenoid plunger moves upward to open the de-ion
contacts which normally short circuit the trip coil.
These contacts are able to transfer the heavy curr e nt
due to a short circuit and permit this current to ener
gize the breaker trip coil.
OPERATION INDICATOR (OJ)
The operation indicator is a small clapper type
device .
A magnetic armature is attracted to the
magnetic
core
upon
energization
When the switch closes two fingers on the arm ature
deflect a spring located on the front of the switch,
which allows the operation indicator target to drop.
The
front
spring,
target, provides restraint for the armature and thus
controls the pickup value of the switch.
INDICATING INSTANTANEOUS TRIP UNIT (ITT)
The instantaneous trip unit is a small a-c oper-
I . L . 4 1 - 1 03 E
•
M A I N T E N A N CE
co-2 and
for
the
types
secondary winding.
Two
The out-of-phase air gap
solenoid switch
/1 cylindrical
arm
with a silver
of
the switch.
in
addition to holding the
E F FECTI VE J U L Y 1 9 67
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