Power Distribution Equipment – Part 2

Synopsis
Power Distribution Equipment – Part 2 builds upon part one and includes the application and selection of circuit breakers, panelboards, switchboards, fuses, and relays. In addition, low & medium voltage switchgear and an introduction to short circuit and coordination studies are included.

Description

Switchboards and Panelboards
Lighting and Appliance Panelboards, 80% vs. 100% Ratings, Power Panelboards, Switchboards and Construction

Capacitors
Sizing and Selection, Discharge of Stored Energy, Conductors and Overcurrent Protection, Impact on Motor Overloads

Circuit Breakers
Types of Breakers, Thermal Magnetic, Electronic Trip, Setting Functions, L,S,I,G, Fully Rated vs. Series Rated

Fuses
Classes of Fuses, R, J, L, Let Thru Energy, Protection of Downstream Equipment – Series Ratings

Low Voltage Switchgear
ANSI Rated Breakers, Draw Out Construction, Short Circuit Ratings
Medium Voltage Switchgear, Switchgear Construction

Overcurrent Relay Operation and Selection
Current Transformers, Interrupting and Momentary Ratings

Short Circuit Calculations
Calculation Procedures and Requirements, Transformer Impedance and Calculations, Source Impedance, Motor Contribution

Time Current Coordination Basics
Time Current Curves, Curves and Coordination of Circuit Breakers
Fuse Coordination, Relay Coordination and Transformer Protection

Case Problem