Westinghouse CVE Instructions Manual

TYPE CVE SYNCHRO-VERI Fl ER RELAY
CAUTION Be fore putting the Synchro-Ve rifie r into
service , remove all blocking inserted for the purpose
of securing the parts during shipment. Make sure
that all moving parts operate
contacts to see that they are clean and close proper­
ly , and operate the relay to check the settings and
electrical connections.
A P P L I C A T I O N
The type CVE synchro-verifier is us ed to verify
the condition of synchronism existing between two
system voltages . The contacts will close when the se
voltage are e qual, within set limits , in phas e , and
of the same fre quency.
The type CVE synchro-verifier is not an auto­
matic synchronizer and should not be used as such.
Automatic Synchronizers are available which permit
closing ahead of synchronism at an angle of phase­
advanc e proportional to the
determined by the speed of operation of the circuit
breaker so that the two systems are connected right
on synchronism.
A common application of the synchro-verfier is
conjunction with automatic reclosing equipment
in
on loop systems fed by generating stations at two
or more points . When a line section trips out the
synchro-verifier is used at one terminal to c he c k
synchronism after the remote terminal i s re closed.
If the two systems are in synchronism the synchro­
verifier permits the automatic reclosing equipment
to reclose the breaker.
C O N S T R U C T I O N A N D O P E R A T I O N
The type CVE relay consists o f an op erating
element and a restraining
their location are shown in Figs. 1,
common di sc. The p rincip al p arts o f the rel ay and
O p e r at i n g E l e m en t
The operating unit consists of a n "E" type
lamination electromagnet with two main coils on the
N EW I N F O RMATION
INSTALLATION
INSTRUCTIONS
freely. Inspect the
beat frequencies and
element mounted on a
and 4.
2, 3,
Westinghouse
•
OPERATION
center l e g and a l ag coil on t h e l eft l eg . A re sistor i s
connected acro ss t h e shading coil .
When the rel ay is energized with two voltages,
a fl u x is produced that is proportional to the sum o f
the applied voltages. This fl ux divides and returns
thro ugh the outer l egs of the electromagnet. The l ag
coil on the l eft l eg cause s the fl ux in that l e g to l ag
the main pol e flux. The out-of-p h as e fl uxes thus pro­
duced in the disc gap c auses a cont act closing torque.
The resistor connected
coil of the electromagnet provides adjustment for
different operating circles of the relay. Increasing
or decreasing the amount of resistance effectively
decreases or incre ase s the contact closing torque o f
the relay.
R e str a i n i n g E l e m e nt
The restraining element consists of an "E" type
l aminated electromagnet with two m ai n coils o n its
center l eg and a l ag coil on its l eft l e g. A fl u x i s p ro­
duced that i s proportional to the difference in the
applied voltages to the rel ay. This fl u x divides and
The la g coil causes the flux throu g h the left le g to
return s through the outer l eg s of the electromagnet.
l ag the m ain pole flux. The out-o f-phase fluxes thus
produced in the disc gap causes a contact op ening
torque.
I nd i c a t i n g C o n t a ctor Swit c h U n i t ( I C S ) - W h e n U s e d
The d-e indicating c ontactor switch is a small
clapper-type device. A magnetic armature , to which
leaf-spring mounted contacts are attached ,
tracted to the magnetic core upon e nergization of the
switch. When the switch closes, the moving con­
tacts bridge two stationary contacts , completing the
trip c ircuit. Also, during this operation, two fingers
on the armature d e flect a spring located on the front
of the switch, which allows the operation indicator
target to drop.
E F F ECTIVE NOVEMBER
41-681. 1
1. L.
•
MAINTENANCE
across the shading
is at­
1960