S225-12-1
3
!
SAFETY
FOR LIFE
Introduction
The QD3 Quik-Drive™ tap-changer combines 50 years of
experience with the latest technology, providing the most
advanced and reliable Voltage Regulator tap-changer.
Cooper Power Systems provides the proven value cus-
tomers have come to expect. By using advanced thermal
set material rather than phenolic material, Cooper Power
Systems has been able to design a product that has the
strength for the most demanding applications as well as
increasing the tracking resistance within the parts. By
simplifying the bridging within the tap-changer, Cooper
was able to simplify the contact design and at the same
time improve product life. The QD3 tap-changer incorpo-
rates Cooper Power Systems exclusive holding switch
circuit, which has set the standard for tap-changer track-
ing reliability.
The Cooper Power Systems QD3 Quik-Drive tap-chang-
er provides endless possibilities when used with the
control technology, starting with the CL-6A control, with
applications such as Preventative Maintenances Tap-
ping (PMT™), Duty Cycle Monitor, and TIME-ON-TAP™
features.
Instructions
These instructions apply to Distribution Voltage Regula-
tors. Read these instructions carefully before attempting
to use the voltage regulator.
The equipment covered by these instructions should
be operated and serviced only by competent personnel
familiar with good safety practices. These instructions
are written for such personnel and are not intended as
a substitute for adequate training and experience in safe
procedures for this type of equipment.
The text of this instruction includes information concern-
ing hazards to safety, which are common to all regulators.
This safety hazard information is offered for guidance
when installing and operating the descriptive matter to
aid in preventing damage to the equipment and to advise
of possible hazards to personnel. When reading this text,
the meaning and content of these statements should be
understood and followed carefully.
General
S225-12-1 covers operating, maintenance and replace-
ment instructions for the QD3 Quik-Drive tap-changer in
Cooper Power Systems VR-32 voltage regulators. The
QD3 tap-changer in 2005 replaced the spring drive tap-
changers for Cooper Power Systems low current appli-
cation single-phase voltage regulators. Replacing the
spring drive model 928, 95 KV BIL and model 170, 150
KV BIL tap-changers. The QD3 tap-changer as like the
spring drive tap-changer are use on voltage regulators
with load rating up to 219 Amps. The QD3 tap-changer
is also rated for voltage regulator up to 219 Amps 150
KV BIL.
Motor
S225-12-1 covers operating, maintenance. The QD3
Quik-Drive tap-changer uses an AC Synchronous Motor
that shaft speed is synchronous with the line voltage fre-
quency. The motor has rapid stating and stopping, stop-
ping with a minimal coast when the motor in de-energized
without the need for a mechanical brake. The motor runs
at an exact speed with no variation with load or voltage
using a permanent magnet rotor to hold the motor shaft
in position when the motor is de-energized. Since the
connection between the rotor and stator is magnetic, the
motor can be stalled without damage. The motor oper-
ates in both clockwise and counter-clockwise directions.
A resistor and capacitor is required for starting and pro-
viding a phase-shifting network to operate the motor
Motor Resistance
To measure the motor resistance of each motor direc-
tional winding, see the following:
Motor Ground “White Lead” to “Blue Lead”
Raise = 27.5 ohms
Motor Ground “White lead” to “Red Lead”
Lower = 27.5 ohms
Raise “Blue Lead” to Lower “Red Lead” = 54 ohms
CAUTION:
Do not operate the motor in air for excessive time
or overheating and failure may result.
Figure 2.
Motor.
PRODUCT INFORMATION
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