Thought to be the only dedicated textbook focused on computational modeling for electric power distribution systems, this second edition clearly explains the principles and mathematics behind these models and provides approximation methods that help students recognize when a result is not what it should be. Using the same authoritative yet accessible approach found in the first, this edition is updated to reflect the latest changes and advances in the field. Finding strength in detail, this text brings engineers worldwide up-to-speed on the modeling and analysis of a distribution system.
Table of Contents:
Introduction to Distribution Systems
Distribution System
Distribution Substations
Radial Feeders
Distribution Feeder Map
Distribution Feeder Electrical Characteristics
Nature of Loads
Definitions
Individual Customer Load
Distribution Transformer Loading
Feeder Load
Approximate Method of Analysis
Voltage Drop
Line Impedance
"K" Factors
Uniformly Distributed Loads
Lumping Loads in Geometric Configurations
Series Impedance of Overhead and Underground Lines
Series Impedance of Overhead Lines
Series Impedance of Underground Lines
Windmil Assignment
Shunt Admittance of Overhead and Underground Lines
General Voltage Drop Equation
Overhead Lines
Concentric Neutral Cable Underground Lines
Tape-Shielded Cable Underground Lines
Sequence Admittance
Shunt Admittance of Parallel Underground Lines
Windmil Assignment
Distribution System Line Models
Exact Line Segment Model
Modified Line Model
Approximate Line Segment Model
Modified "Ladder" Iterative Technique
General Matrices for Parallel Lines
Windmil Assignment
Voltage Regulation
Standard Voltage Ratings
Two-Winding Transformer Theory
Two-Winding Autotransformer
Step-Voltage Regulators
Windmil Assignment
Three-Phase Transformer Models
Introduction
Generalized Matrices
Delta–Grounded Wye Step-Down Connection
Delta–Grounded Wye Step-Up Connection
Ungrounded Wye–Delta Step-Down Connection
Ungrounded Wye–Delta Step-Up Connection
Grounded Wye–Delta Step-Down Connection
Open Wye–Open Delta
Grounded Wye–Grounded Wye Connection
Delta–Delta Connection
Open Delta–Open Delta
Thevenin Equivalent Circuit
Windmil Assignment
Load Models
Wye-Connected Loads
Delta-Connected Loads
Two-Phase and Single-Phase Loads
Shunt Capacitors
Three-Phase Induction Machine
Windmil Assignment
Distribution Feeder Analysis
Power-Flow Analysis
Short-Circuit Studies
Windmil Assignment
Center-Tapped Transformers and Secondaries
Center-Tapped Single-Phase Transformer Model
Ungrounded Wye–Delta Transformer Bank with a Center-Tapped Transformer
Leading Open Wye–Open Delta Transformer Connection
Lagging Open Wye–Open Delta Connection
Four-Wire Secondary
Putting It All Together
Windmil Assignment
Appendix A: Conductor Data
Appendix B: Underground Cable Data
About the Author :
William H. Kersting received his BSEE from New Mexico State University (NMSU), Las Cruces, and his MSEE from the Illinois Institute of Technology. He joined the faculty at New Mexico State University in 1962 and served as professor of electrical engineering and director of the Electric Utility Management Program until his retirement in 2002. He is currently a consultant for Milsoft Utility Solutions. He is also a partner in WH Power Consultants, Las Cruces, New Mexico. Professor Kersting is a life fellow of the Institute of Electrical and Electronics Engineers. He received the Edison Electric Institute’s Power Engineering Educator Award in 1979 and the NMSU Westhafter Award for Excellence in Teaching in 1977. Prior to joining NMSU, he was employed as a distribution engineer at El Paso Electric Company. Professor Kersting has been an active member of the IEEE Power Engineering Education Committee and the Distribution System Analysis Subcommittee.
