Westinghouse CVE Installation, Operation & Maintenance Instructions Manual

CAUTION: Before putting the Synchro-Verifier into service,
remove all blocking inserted for the purpose of securing the
parts during shipment. Make sure that all moving parts
operate freely. Inspect the contacts to see that they clean and
close properly, and operate the relay to check the settings and
electrical connections.
APPLICATION
This instruction leaflet applies to the following types of
relays:
CVE Synchro-Verifier Relay
CVE-1 Synchro-Verifier Relay with
line and bus voltage
sensing relays
The synchro-verifier is used to verify the condition of
synchronism existing between two system voltages. The
contacts will close when these voltages are within set limits.
The synchro-verifier is not an automatic synchronizer and
should not be used as such. Automatic Synchronizers are
available which permit closing ahead of synchronism at an
angle of phase-advance proportional t
and 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-verifier is in
conjunction with automatic reclosing equipment or 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 check synchronism after the remote terminal
is reclosed. If the two systems are in synchronism, the
synchro-verifier permits the automatic reclosing equipment to
reclose the breaker.
Some provision, such as a reclosing rela r . must be used
to control closing through the CVE(-1) contacts to avoid
the possibility of pumping when closing into a fault.
CONTRUCTION AND OPERATION
The type CVE relay consists of an operating element and
a restraining elemen t mounted on a common disc. The
principal parts of the relay and their location are shown in
Figs. I, 3, and 4.
SUPERSEDES I.L. 41-681.1L, DATED MARCH 1978
0 DENOTES CHANGES FROM SUPERSEDED ISSUE.
INSTALL A Tl 0 N
INSTRUCTIONS
TYPE CVE AND CVE-1
SYNCHRO-VERIFIER RELAYS
�
the beat frequencies
Westinghouse
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OPERATION
The CVE- 1 relay, Figure 2, consists of two telephone type
ac voltage sensing relays in addition to the components of the
CVE relay. The principal parts of the relay are connected as
per Figure 5.
Operating Element
The operating unit consists of an "E" type laminated
electromagnet with two main coils on the center leg and a lag
coil on the left leg. A resistor is connected across the shading
coil.
When the relay is energized with two voltages, a flux is
produced that is proportional to the sum of the applied
voltages. This flux divides and returns through the outer legs
of the electromagnet. The lag coil on the left leg causes the
flux in that leg to lag the main pole flux. The out-of-phase
fluxes thus produced in the disc gap causes a contact closing
torque.
The resistor connected across the lag coil of the electro­
magnet provides adjustment for different operating circles of
the relay. Increasing or decreasing the amount of resistance
effectively decreases or increases the contact closing torque of
the relay.
Restraining Element
The restraining element consists of an "E" type laminated
electromagnet with two main coils on its center leg and a lag
coil on its left leg. A flux is produced that is proportional to
the difference in the applied voltages to the relay. This flux
divides and returns through the outer legs of the electromag­
net. The lag coil causes the flux through the left leg to lag the
main pole flux. The out-of-phase fluxes thus produced in the
disc gap causes a contact opening torque.
All
possible contingencies which may arise during
installation. operation, or maintenance, and all
details and variations of this equipment do not
purport to be covered by these instructions. If
further information is desired by purchaser re­
garding his particular installation, operation or
maintenance of his equipment, the local West­
inghouse Electric Corporation representative
should be contacted.
EFFECTIVE DECEMBER 1978
I.L.41-681.1M
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MAINTENANCE