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Seminar Description
Industrial Electrical Systems
Course Length -
3
Days (with one optional evening lab session on the second day, 7 - 9 P.M.,
for additional hands-on experience with three-phase transformer
connections, phase angle measurement, protective relay testing or
programming, or use of the Kilowatt Classroom Radial Feeder Analysis Software©).
Synopsis –
An advanced level electrical seminar designed for individuals with a good
electrical background involved in full-time electrical maintenance.
Program presents advanced electrical theory and three-phase power system
analysis. Procedures for conducting an electrical system power study and
power factor improvement are covered. There is an in-depth coverage of
electrical equipment and controls. Preventive maintenance and equipment
test methods which will reduce costly downtime are presented.
Who Should Attend – Journeymen Electricians, Electrical
Supervisors, Plant Engineers.
Curriculum – Introduction: Basic trigonometry
and AC calculations review, Sine Wave fundamentals review.
Advanced AC Circuit Theory: Inductive and capacitive reactance,
impedance, power triangle, working with phasors.
Characteristics of Three-Phase
Power Systems: Delta, Wye, resistance grounded neutral systems,
ground system testing. Three-phase power measurement lab: True
power, reactive power, apparent power, demand.
Power Factor, power factor
correction techniques. Single and Three-phase Transformers:
Theory, construction, testing. Single-phase transformer lab: turns ratio,
polarity, impedance. Three-phase transformer connection lab with phase
angle measurement.
Using the Radial Feeder Analysis Software: Electrical system
impedance, available fault current, effect on equipment sizing and motor
starting voltage drop.
Electrical System Protection: Fundamentals of protective device
coordination. Fuses; types, curve interpretation,
fuse ratings. Circuit breakers: thermal, magnetic, shunt trip and
undervoltage trip devices, settings. MCP’s.
Overload relays: bimetallic, eutectic alloy, solid state, sizing and
setting. Instrument transformers, PT’s, CT’s, types, standard ratios,
connections, burdens, accuracy classes, testing, safety. Protective
relays: electromechanical, electronic, functions, applications, operating
characteristics. Relay testing lab work. Three-phase Induction Motors:
Theory, construction, NEMA design types, connections, testing.
Special AC motors: Wound rotor, synchronous,
and multiple-speed. AC Generators: Types,
excitation methods, synchronizing equipment. DC
Motors and Generators:
Construction; types; series, shunt, compound; maintenance; testing.
Introduction to Solid-State Power Devices:
Diodes, SCR's, GTO's, power transistors, Hall Effect CT's.
Introduction to Solid-State Motor and Generator
Controls: DC motor speed controls; AC motor controls; reduced
voltage starters, variable frequency drives, synchronous motor field
exciters, brushless excitation. AC generator voltage regulators: circuitry, operation.
Motor / Generator Maintenance: Insulation
testing (meghommeter, hipot), brush maintenance, commutator and slip ring
maintenance, control maintenance.
Prerequisites – Electrical
Fundamentals Course or equivalent experience.
Included Materials – All participants will receive specially
developed text and lab material from The
Industrial Electrician's Notebook™. Also included is the Kilowatt Classroom Radial Feeder Analysis
Software© for calculation of feeder impedance, available fault current,
and motor starting voltage drop. (This program requires a computer with
Microsoft Windows and Microsoft Excel already installed). Also included
and reviewed are several versions of freeware offered by fuse and
protective relay manufacturers.
Student Provided Equipment – Students will need to provide a
digital multimeter, typical electricians' hand tools, safety glasses, and
an engineering calculator (square root and trig functions).
Attendees are encouraged to bring schematic diagrams of the equipment they
encounter in the field. Individuals who have a laptop computer should
bring it in order to fully utilize the provided software. (Attendees
without a laptop will still be able to work with the provided programs
using the instructor's laptop.)
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