Westinghouse
r
.
L
. 41- 9 3 3 . 3
INSTALLATION
•
OPERATION
•
MAINTENANCE
INSTRUCTIONS
TYPE KV-1 UNDERVOLTAGE RELAY
Before putting relays into service, remove all blocking
which may have been 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 are clean and close properly,
and operate the relay to check the settings and electrical
connections.
APPLICATION
The type KV-1 is a high-speed single phase undervoltage relay
particularly suited for applications where high drop-out ratio
is desirable.
This relay may be used for high-speed carrier tripping or carrier
starting for phase fault clearing of a weak-feed terminal.
In
this case the trip units are supervised by the type
KA
carrier
auxiliary relay to prevent tripping for external faults.
Hot- line reclosing is another application for this relay.
CONSTRUCTION AND OPEFATION
The type KV-1 relay consists of a high speed undervoltage cylinder
unit (V) with an adjustable dropout and an indicating contactor
switch (ICS).
UNDERVOLTAGE UNIT (V)
The undervoltage unit is a product induction cylinder type unit.
The time phase relationship of the two air gap fluxes necessary
for the development of torque is achieved by means of a capacitor
connected in series with one pair of pole windings.
Mechanically, the undervoltage unit is composed of four basic
components:
a die-cast aluminum frame, an electromagnet, a moving
element assembly, and a molded bridge.
SUPERSEDES l\1IMEOGRAPHED I.L.
EFFECTIVE NOVEMBER
1970
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