General; Installation; Operation - Westinghouse CVR-1 Instructions Manual

General

The type CVR-1 Voltage Regulating Relay
is in reality a "control package" designed to
control load tap changers.
ponents of the CVR-1 relay are an induction
disk type voltage sensitive relay, two
iliary or pilot relays, two motor control re­
lays, line drop compensator, and a reactor.
All components are in a drawout chassis
6)
(Figures 1 and so that the complete relay
may be interchanged from unit to unit or
removed for testing and inspection.
Flexitest® switch base is made an integral
part of the CVR-1 relay to facilitate con­
necting and testing the relay.
which the relay is mounted for tap changer
control is equipped with the mating portion
of the Flexitest® switch.

Installation

The CVR-1 relay is usually mounted in the
tap changer control panel. Before putting the
relay in service, remove any blocking in­
serted for the purpose of securing parts
during shipment; make sure that all parts
operate freely, and inspect the contacts to
see that they are clean and close properly.
Check the gaps of the permanent magnet and
of the electromagnet and clean them if any
foreign material is present.
relay to check the settings and electrical
connections.

Operation

The sensing element of the CVR-1 relay is
an induction disk voltage relay with a set of
single pole double throw contacts. Sealing
circuits for the auxiliary relay are incor­
porated into the circuit to insure long contact
life and positive operation.
Figure 2 shows schematically the rela­
tion between the principle components of the
CVR-1 relay voltage sensing circuit, while
4
Figures 3 and show the internal schematic
and internal wiring of the actual CVR-1
relay.
The major com­
atL'\:­
The
The case in
Operate the
voltage sensing element is a large portion of
the impedance of this circuit.
minimizes the effect of resistance varia­
tions due to temperature changes. The re­
actor is also used in the line drop com­
pensator circuit.
voltage sensing element supplies a current
to the coil on the upper pole by transformer
action.
these poles are in quadrature.
nating flux cutting the induction disk induces
eddy currents in the disk of the relay which
Fig. 1- CVR-1 Relay Removed
A reactor connected in series with the
The voltage coil on the lower pole of the
The alternating fluxes induced in
Page 3
Case
from
This feature
The alter­