Protection Application for Power Distribution Systems

3 Days

Learning

After successful completion of this course, participants would be able to understand the fundamental philosophy of power system protection. They would also gain knowledge on basic fault analysis, helping them to analyze system events and perform post fault trouble shooting and suggest improvements. Participants of this course would also learn the operating principles of all protection systems present in power distribution systems (such as over current, earth fault, transformer and line differential protection). They would also learn the technical issues behind selection of instrument transformers for a given application. With the knowledge gained in this course, they would be able to operate and maintain the protection system of an electrical power distribution system better and also perform effective and fast trouble shooting when required.

Participants

Practicing engineers working in power distribution utilities, industries and consultants will benefit from this course. To derive maximum benefit from the course, we recommend that only participants with electrical engineering background take up this course. Participants could be technicians, operations staff, planning engineers, maintenance engineers, application engineers or commissioning engineers.

Course Outline

Fundamental Concepts

  • Various elements of power system
  • Operating states of the power system
  • Building blocks of protection system
  • Vital properties of a protection system
  • Zones of protection
  • Main and back-up protection
  • Monitoring of protection system

Basic Fault Calculation

  • Types of faults
  • Single-phase and three-phase fault calculations
  • Per unit calculation method
  • Worked examples for fault calculations

Instrument Transformers

  • Types of current transformers
  • Effect of current transformer core and winding design on its performance
  • Causes of errors in current transformers
  • Reasons for saturation of current transformers and its effect on protection
  • Specification of current transformers used for protection and metering applications
  • Types of voltage transformers
  • Specifying voltage transformers for protection and metering applications
  • Various methods of connection of voltage transformers and their application

Overcurrent and Earth Fault Protection

  • Types of OC protection devices
  • Different OC protection characteristics and their application
  • Basis for selecting the settings of OC and EF protection for various applications
  • Procedure for co-ordinating OC and EF protection
  • Application of various types of earth fault protections
  • Application, operating principle of directional relays and their setting

Line Differential Protection

  • Current differential protection principle
  • Differential protection characteristics
  • Techniques for synchronising signals

Transformer Protection

  • Types of 3-phase transformer connections
  • Fault current distribution in 3-phase transformers
  • Types of faults in transformers
  • Transformer differential protection
  • Restricted EF protection for star and delta winding
  • Backup OC and EF protection
  • Ancillary protection of transformers