Product Information; Introduction; Standards; General - Eaton QD5 Manual

Product information

Introduction

Eaton combines more than 50 years of tap-changer
experience with the latest technology providing the most
advanced and reliable voltage regulator tap-changer in its
Cooper Power series QD5 Quik-Drive™ tap-changer. Eaton
provides the proven value customers have come to expect
from the leader. By using advanced thermal-set material
rather than Phenolic material Eaton has been able to design
in strength to meet the most demanding applications.
The design provides for an improved contact alignment
and longer contact life. The QD5 tap-changer incorporates
Cooper's exclusive holding switch circuit, which has set the
standard for tap-changer tracking reliability.
The QD5 Quik-Drive tap-changer offers many advanced
features when integrated with Eaton's Cooper Power series
voltage regulator controls. Applications such as Preventative
Maintenances Tapping (PMT™), Duty Cycle Monitor (DCM),
and Time–ON-TAP™ features enables the unique capability
to monitoring factors that affect tap-changer life.
Read this manual first
These instructions apply to distribution voltage regulators
equipped with the QD5 tap-changer. Read these instructions
carefully before attempting maintenance on 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 concerning
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.

Standards

ISO 9001 Certified Quality Management System
QD5 QUIK-DRIVE TAP-CHANGER INSTALLATION AND MAINTENANCE INSTRUCTIONS MN225012EN March 2016
CAUTION
Do not operate the motor in air for excessive periods of
time or overheating and failure may result.
Figure 1. Motor.

General

Service Information MN225012EN covers operating,
maintenance and component replacement instructions for
the QD5 Quik-Drive tap-changer in Eaton's Cooper Power
series VR-32 voltage regulators. The QD5 tap-changer
in 2003 replaced the 770 Direct Drive tap-changers for
low current application single-phase voltage regulators.
Replacing the medium direct drive model 770, 150 kV BIL,
the QD5 tap-changer like the 770 direct drive tap-changer
are used on voltage regulators with a load rating up to 328
Amps. In 2007 , the original Phenolic contact board design of
the QD5 was replace by thermal-set material.

Motor

The motors for the QD5 Quik-Drive tap-changer are
permanent split capacitor type suitable for operation in both
directions of rotation at 120 Vac, single-phase, 50/60 Hz. All
components are compatible with hot transformer oil and
windings are oil cooled. The motor will carry locked–rotor
current for at least 3000 hours.

Motor resistance

To measure the motor resistance of each motor directional
winding, see the following:
Motor Ground "White Lead" to
"Blue Lead" Raise
Motor Ground " White Lead" to "
Red Lead" Lower
Raise "Blue Lead" to Lower
"Red Lead"
= 7 .2 ohms
= 7 .2 ohms
= 13.9 ohms
1