in our Power Grids Academy course from wherever you are!

• Live training with our experienced teachers.
• Dynamic classes in an interactive virtual environment.
• Q&A sessions after each class.

LIVE CLASS TIME:

Day 1 & Day 2: 9am - 11am & 1pm-3pm UTC Time

Overvoltage and insulation coordination (8 hours, 600 euros, 17-18 May OR 4-5 November 2021 @ 9am UTC)

Insulation Coordination

Introduction to the insulation coordination

• Standards and bibliography
• Standard tests
• Insulation coordination procedures
• Insulation levels

Temporary overvoltage (TOV)

• Single phase to ground faults
• Load rejection
• No load line
• Resonance and ferro resonance

Fast front Lightning overvoltage

• Lightning strike
• Travelling waves theory
• Lattice diagram: Reflection-refraction diagrams

Slow front overvoltage

• Basic concepts
• Overhead lines: energization and reclosing phenomena
• Trip of small inductive loads
• Trip of capacitive loads
• Fault tripping procedure and effects: transient recovery voltage

Insulation levels selection and coordination

• Standards
• Insulation materials and overvoltage
• Types and definitions
• Normal distribution
• Weibull distribution
• Sparking distribution voltages and overvoltage
• Insulation coordination
• Coordination withstand voltages
• Required withstand voltages
• Test conversion rates
• Minimum clearing distances
• Insulation and substation distances
• String insulators
• String insulators creapage line
• Post insulators

Protection equipment. Surge arresters

• Standards
• Protection equipment against overvoltage
• General features
• Spark gaps
• Surge arresters
• Characteristics of metal oxide surge arresters
• Overhead line protection with surge arresters

Insulation coordination. Substation case study

Shielding

• Introduction to lightning strike phenomenon
• Standards and bibliography
• Lightning strike
• Travelling waves
• Shielding
• Electro-geometric model shielding method (EGM)
• Overhead line shielding
• Substation shielding
• CENELEC shielding method