Medium Voltage Power Systems
Raleigh – As Presently Scheduled
August 3 – 4, Raleigh, NC
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 2 day class by 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 overcurrent protection, surge protection, insulation coordination and many other important aspects of medium voltage power systems.
Jim has developed this course based on over 35 years of extensive experience with industrial, commercial and utility power systems and standards development. He is not just another trainer reading a script. Jim’s training is based on his insider’s view from being very active with many different standards committees which provides him with the unique perspective, literally from the inside. Coupled with his broad electrical power background, he loves sharing his experience and insider’s view with others.
One of the many topics that Jim discusses in this 2 day class is overcurrent relays and relay settings including determining the current transformer ratio, CT saturation calculations, determining overcurrent relay settings and calculating transformer differential relay settings. This class also includes many other topics such as surge protection, insulation coordination and more.
Register 3 People and the 4th is FREE!
Medium Voltage Systems, Voltage Ranges, Special Considerations
Failure Modes, Voltage Stress, Thermal Stress
MEDIUM VOLTAGE SAFETY
Electrocution at Low vs. Medium Voltage, Arc Flash Issues, Qualified Person,
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, Transformer Characteristics, Tank Construction, Loss Evaluation, Loss Calculations, Efficiency Calculations, Regulation
Spot Network Design, Network Protectors, Network Protector Relay Operation, Directional Protection Requirements, Large Network Fault Currents
Corona, Surface Tracking, Voltage Stress, Sensing Partial Discharge, Component Failure
GROUNDING MEDIUM VOLTAGE SYSTEMS
Resistance Grounding, Solid Grounding, Ungrounded Delta Charging Current, Coefficient of Grounding Calculations, Effect of Ground Faults on Delta Voltage, Sizing Grounding Resistors, High Resistance Grounding vs. Low Resistance Grounding
OVERVIEW OF SYMMETRICAL COMPONENTS
Positive, Negative and Zero Sequence Impedance, Per Unit
Line-to-Ground Short Circuit Calculations
Lightning and Switching Surges, Classes of Surge Arresters, Insulation Basic Impulse Level BIL , Basic Impluse Switching Insulation Level (BSL) Front of Wave (FOW), MCOV Ratings – (Maximum Continuous Operating Voltage) TOV – (Maximum Temporary Over Voltage Capability), Protective Characteristics, Surge Arrester Selection, Energy Capability, Effect of Grounding on Arrester Selection, Insulation Coordination, Protective Ratio and Protective Margin Calculations.
CURRENT TRANSFORMER APPLICATIONS
Ratings, Selection Process, Accuracy, Saturation, Excitation Curves, Burden,
Calculation, Momentary Ratings, CT Saturation Calculations for Performance
MEDIUM VOLTAGE CIRCUIT BREAKERS
Vacuum, Air, Oil, SF6 Designs, Symmetrical Interrupting Rating, K-Rated
Voltage Factor, Close and Latch Capability
Protective Relay Concepts, Selective Coordination Principles, ANSI Device Numbers i.e. 50, 51, 67, 32, 27, etc. Amp Tap, Time Dial, Instantaneous Setting Relay Setting Calculations, Digital Relays, Electromechanical Relays, Time Margins, Coordination Between Devices
Application on Feeder Circuits, Recloser Settings, Continuous Current and Interrupting Ratings
MEDIUM VOLTAGE FUSES
Medium Voltage Switches, Load Rating, Expulsion vs. Current Limiting Fuse Characteristics, E and R Rated Fuses, Fuse Cutouts, ANSI Time Current Points
MEDIUM VOLTAGE PROTECTION CONCEPTS
Medium Voltage Protection, Relays, Circuit Breakers, R and E rated Fuses,
Short Circuit vs. Overcurrent Protection
DISTRIBUTION FEEDER PROTECTION
Protection with Fuses – 300%, Overcurrent Protection with Relays – 600%,
Short Circuit Damage Characteristics, Relay “Reach” for End of Line Faults
ROTATING MACHINERY PROTECTION
Protection Requirements, Generator Decrement Curves, Thermal Damage Curves, Reactive,
Capability Curves, Differential Protection, Protection Example Calculations
MEDIUM VOLTAGE MOTOR CONTROLLERS
Protection Requirements, Motor Management Relays, Circuit Breaker Protection, Relaying, Class R Rated Fuses
ANSI C57 Transformer Thru Fault Curves, Impact of Transformer Winding Configuration,
Overview of Differential Protection, Inrush and Harmonic Restraint, Hands On Differential Relay Setting Calculation Problems and Calculation Worksheets.
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