Medium Voltage Power Systems – Part 1

Synopsis
The backbone of many electric power systems is the medium voltage distribution system. Typically operating at voltages ranging from 2,400 to 34,500 Volts, voltage stress, corona, surges and protection of equipment all create unique challenges in design, equipment selection, operation and engineering.

This first of 2 classes Jim Phillips, P.E. takes you through the fundamentals of medium voltage power systems including the components, equipment, design and operation problems as well as protection of medium voltage systems.

Description

MEDIUM VOLTAGE SAFETY
Electrocution at Low vs. Medium Voltage, Arc Flash, Qualified Person,
Approach Boundaries

TYPES OF MEDIUM VOLTAGE SYSTEMS
Utility and Industrial One lines, Reliability Requirements, Overhead and Underground
Systems, Regulated Systems

MEDIUM VOLTAGE CABLE
Copper vs. Aluminum Design, Voltage Ratings
Insulation Ratings, 100%, 133%, 173% Insulation Levels, Shielding Requirements,
Electric Fields, Terminating MV Conductors, Orientation of Overhead Lines

MEDIUM VOLTAGE SUBSTATION TRANSFORMERS
Core and Coil Design, Aluminum and Copper Windings
Tank Construction, Loss Evaluation, Efficiency, Regulation

SPOT NETWORKS
Spot Network Design, Network Protectors, Network Protector Relay Operation,
Directional Protection Requirements

PARTIAL DISCHARGE
Corona, Surface Tracking, Voltage Stress, Sensing Partial Discharge,
Component Failure

GROUNDING MEDIUM VOLTAGE SYSTEMS
Resistance Grounding, Solid Grounding, Ungrounded Delta Charging Current,
Effect of Ground Faults on Delta Voltage

OVERVIEW OF SYMMETRICAL COMPONENTS 
Positive, Negative and Zero Sequence Impedance, Per Unit
Line-to-Ground Short Circuit Calculations

SURGE PROTECTION
Lightning and Switching Surges, Classes of Surge Arresters
MCOV Ratings – (Maximum Continuous Operating Voltage)
TOV – (Maximum Temporary Over Voltage Capability), Protective Characteristics, Surge Arrester Selection, Energy Capability, Effect of Grounding on Arrestor Selection, Insulation Coordination.

About Jim Phillips: Electrical Power and Arc Flash Training Programs – For over 30 years, Jim Phillips has been helping tens of thousands of people around the world, understand electrical power system design, analysis, arc flash and electrical safety.

Jim is Vice Chair of IEEE 1584, International Chairman of IEC TC78 Live Working and Steering Committee Member – IEEE/NFPA Arc Flash Collaborative Research Project. He has developed a reputation for being one of the best trainers in the electric power industry.  Learn More

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