ELC 012 – Earthing Protection System

ELC 012 – Earthing Protection System

Category:
Electrical & Electronic/ In-House Programs/ Technical & Engineering/
Siemens-Standort Nürnberg Vogelweiherstraße / Siemens Nurember

Duration: 2 Days
Lectures: InHouse
Certificate of Completion

INTRODUCTION

This is a course intended to provide a comprehensive coverage of substation earthing system design for safety and protection systems. The course provides comprehensive coverage of earthing system design and protection systems. A simplified coverage of the basic principles in earthing design, which involve the measurement and interpretation of soil resistivity, and some simple calculations for the design of earth resistance for the substation are first provided.

It is then followed by the operation of the protection systems which include the operation of protection schemes, such as various circuit breakers and power system protection relays. The issue of what
constitutes to an adequate design of the earthing and protection systems will also be addressed.

Objective

  • To understand the concept of earthing systems.
  • To understand the earthing system design procedures and performances
  • To have knowledge on the techniques used on the earth resistivity and earth resistance measurements suggested in the standards
  • To understand definitions and calculations of ground potential rise (GPR), touch, and step voltages
  • To identify the types of fault
  • To understand and analyse the principles and operation of protection schemes
  • To learn and analyse various circuit breakers
  • To understand the characteristics of various power system protection relays
  • To understand the differences between analogue and digital protection schemes

Who should attend?

  • Electrical engineers who are responsible for electrical systems in substation, maintenance, building and industries.
  • Electrical contractors, plant engineers and utility engineers
  • Electrical engineering technicians who may not have formal electrical engineering education.
  • Civil servants, executives, managers and sales personnel dealing with electrical engineering projects

CURRICULUM

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Day One

  • Recommended Earth Impedance Value
  • Earth Equivalent Circuit Representation

  • Soil Resistivity
  • Types of Soil
  • Moisture content
  • Soil temperature
  • Chemical Content.
  • Installation of ground enhancement materials
  • Measuring installed grounding systems.
  • Maintenance of the grounding system

  • Shape on Electrode Resistance
  • Selection of a Material for an Earth Electrode
  • Corrosion and Type of Soil
  • Corrosion due to interconnection with another metallic item
  • Other Considerations

  • Design considerations
  • Design procedure

  • Equally spaced or Wenner Method
  • Unequally-spaced or Shlumberger-Palmer Arrangement
  • Interpretation of the Measurements
  • Master Resistivity Curve
  • Curve Matching Method

Day Two

  • Fall of Potential Method
  • Methodology

  • Types of faults
  • Symmetrical fault analysis
  • Unsymmetrical fault analysis
  • Fault current reduction
  • Case studies

  • Introduction to Protection
  • Fault detection principles
  • Basic components

  • Creation and extinction  of arc
  • Types of circuit breakers: air, air-blast, oil, vacuum, SF6
  • Rating, selection of CB
  • Testing
  • Auto-reclosing CB
  • MCB
  • Fuses: rewireable, cartridge, HRC

  • Over current, earth fault, over load, differential, distance relays
  • Buchholz, temperature sensitive relays
  • Equipment protection
  • Transformer
  • Generator
  • Transmission and distribution line
  • Motor
  • Digital Protection
  • Computer/Microprocessor based protection algorithm for over current, differential, impedance relays