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Circuit Breakers , Switchgear & Power Transformers

  • Schedule : Online
  • Who is this for: Electrical Engineering Students, Professionals

Duration: 5-8 Hours
Schedule: Online
Level: Beginner
Rs: 63,000

Course Overview

Objective

  • To help you gain a solid understanding of the issues associated with the proper application, installation, and maintenance of these critical items of equipment, with an overriding emphasis on safety.

  • ntroduction to Switchgear and Transformers
  • Application of Switchgear
  • Specification of Switchgear
  • Safety Policies
  • Operation of Modern Switchgear
  • Diagnostics,Testing and Maintenance
  • Transformers' Main Functions and Classifications
  • Transformer Theory
  • Power Transformer Protection
  • Auto-Transformers, Generator Transformers, Unit Transformers and Station Transformers
  • Oil Quality
  • Power Transformer Electrical Tests

Topics covered are

  • Single line diagrams

  • Active and passive network components

  • Circuit breaker utilization

  • Alternative forms of MV switchgear – ring main units and load breaking/fault making switches

  • Fuse switches

  • HV fuses in combination with and as alternatives to circuit breakers

  • Auto-reclosers and auto-reclose operation

  • Principles of current interruption

  • Plain break circuit breakers

  • Bulk and small oil volume circuit breakers

  • Turbulator (explosion pot)

  • Operating mechanisms

  • Transfer earth circuit breakers

  • Air break and air blast switchgear

  • SF6 and vacuum

  • Switchgear in association with isconnectors

  • Fixed and withdraw-able designs

  • Switchgear standards

  • Factors affecting switchgear selection

  • Switchgear ratings – highest system and impulse withstand voltages, load, and short circuit currents

  • Simple and complex protection systems

  • Switchgear ancillaries, measurement CTs, VTs and relays

  • Cable terminations

  • Indoor and outdoor operation

  • Substation and switch room layouts and design

  • Short circuit testing

  • General safety precautions and the use of personal protective equipment

  • Principles of safety rules

  • Principles of personal authorization

  • Operative training for the safe operation of switchgear

  • Isolation in a circuit breaker context

  • Safety documentation

  • Operational and safety locking, caution and danger notices

  • Work safety in a substation environment

  • Safety interlocks

  • Substation alarms

  • Individual study tasks and presentation – safety policies in my company and how they might be  improved

  • Case Studies

  • Switchgear inspection methodologies

  • Partial discharge measurement and survey

  • Timing tests

  • Thermovision

  • Mechanisms of deterioration

  • Principles of circuit breaker maintenance

  • Maintaining oil circuit breakers

  • Contact maintenance and contact wipe

  • Oil testing

  • Maintaining vacuum circuit breakers

  • Maintaining SF6 circuit breakers

  • SOPs and DINs

  • Switchgear defects and defect control Systems

  • Construction (shell type and core type)

  • Classification and type in relation to insulation, windings, core, cooling systems, voltage level, sizing, tank and breathing action

  • Transformer parts

  • Power transformers and safety

  • Electrical values and their definition in a power transformer – voltage, current, number of turns,  impedance and their interrelation

  • Operation of power transformers in a power system

  • Thermal performance, loading, paralleling, tap-changing, connections and vector groups

  • Surge protection

  • Protective relaying (differential, over-current and earth fault)

  • Buchholz relay and pressure relief relay

  • Thermal devices and instruments (oil temperature alarm and trip, winding temperature alarm and trip)

  • Design criteria

  • Specifications

  • Oil contents: water, acidity and dissolved gas

  • Oil tests: dielectric breakdown, moisture, resistivity, interfacial tension, specific gravity, power factor and furan analysis

  • Recovery voltage measurement test

  • AC Tests:

  • Power factor tests (insulation, oil, and bushings)

  • Single-phase excitation current test

  • Transformer turns ratio test

  • DC Tests

  • Preventative maintenance on power transformers

  • Techniques to improve life expectancy