Power Distribution Equipment – Part 1

Synopsis:
Power Distribution Equipment will help the student gain insight into the operation, selection and application of motors and variable frequency drives. You will also learn about transformer design, application and protection as well as transformer vault requirements.

Description
Introduction to Specification and Design
Design Process, Specifications, Drawings

Conductors for General Wiring
Ampacity and Temperature Consideration, Locations, Markings, Direct Burial
Medium Voltage Cable, Ampacity, Shielding and Voltage Stress

Cable Tray and Conduit
Types of Conduit, Cable Tray Practices and Requirements

Busway
Construction and Application, Plug on vs. Feeder, Short Circuit Requirements

Motors
Motor Operation, Theory and Nameplate Data, Speed, Slip, Full Load Current, Horsepower, Efficiency, Locked Rotor Current, Service Factors, Frame Sizes, NEMA Designations, Designing Motor Circuits, Overload Protection, Short Circuit Protection

Motor Control Centers
Starter Types, Starter Sizes, Bus Bracing and Current Ratings

Variable Frequency Drives
Drive Characteristics and Operation, Torque vs. Speed, Frequency Control, Input and Output Characteristics, IGBT Operation, V/F Characteristics and Speed Control, Torque Speed Acceleration Curves, Vector – Torque Drives

Transformers
Transformer Construction, Insulation Ratings, BIL Ratings, Cooling
Connections, Losses, Short Circuit Test, Efficiency, Protection, ANSI Criteria, NEC Requirements, Insulating Fluids, Vault Requirements