Synopsis PART I
Electric Motors, Drives and Energy Saving
This part deals with three- and single-phase a.c.
machines, and their protective switchgears. However, reference
is made to and comparisons drawn of a d.c. motor with an a.c.
motor, to assist a user make a proper choice of machine. Energy conservation,
energy auditing and energy efficient motors (EEM). However simple a
motor is, it requires careful handling to ensure optimum performance and long
years of trouble free operation. A small drive, failing while in operation,
may bring the entire process to a halt. One can visualize the loss of production
that can result. Power plants, chemicals, fertilizers, petrochemicals, paper
and cement mills all require careful selection of equipment to avoid breakdown
or malfunctioning during operation. Motors and their control gears
are core components that require special attention:
. It deals with the specifications, performance, characteristics and
behavior of motors under different operating conditions, their application
and selection. It also covers aspects such as shock loading, motors for hazardous
locations and open transient conditions in MV motors during a switching sequence.
. This part-also deals with static controls and drives, soft starting
and process control through solid-state technology (phasor and field-oriented
controls) using IGBTs, IGCTs, SGCTs. Energy conservation. Developments and
applications of solid state technology. Grounding practices and shielding
of signals. Prevention from bearing currents.
. There is special coverage of fluid couplings for soft starting and
speed control. A comparison between static drives and variable-speed fluid
couplings is made.
. Windmills (induction generators) as an unconventional energy source,
vertical hollow shaft motors and submersible pump sets, selection of energy
efficient and space saver belts for transmission of load, the phenomenon and
remedy of shaft currents.
. The text especially covers testing requirements and an introduction
to quality assurance systems and application of ISO 9001(2000).
. Special coverage of impulse testing of resin-rich formed coils and
their in-house testing requirements.
. In Chapter 12 a detailed analysis is made of all unfavorable operating
conditions and their effect on the performance of the motor and its protection
for optimum utilization.
The precautions also cover surge protection for MV motors. The details provided
cover the smallest-influence that a particular parameter can have on the machine.
Microprocessor based switching devices (IEDs) and intelligent starters.