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Electrical Generators & Excitation Systems

Selection, Applications, Operation, Diagnostic Testing, Troubleshooting, Maintenance, and Refurbishment

Upcoming Courses

Description


This seminar will provide a comprehensive understanding of the various types of generators, exciters, automatic voltage regulators (AVR’s), and protective systems.  This seminar will focus on maximizing the efficiency, reliability, and longevity of this  equipment by providing an understanding of the characteristics, selection criteria, common problems and repair techniques, preventive and predictive maintenance.  The emphasis in this seminar is on inspection methods, diagnostic testing, troubleshooting, modern maintenance techniques, refurbishment, rewind and upgrade options, and advanced methods for preventing partial discharge and other failures.

This seminar is a MUST for anyone who is involved in the selection, applications, or maintenance of generators, exciters, automatic voltage regulators (AVR’s), and protective systems because it covers how this equipment operates, the latest maintenance techniques, and provides guidelines and rules that ensure the successful operation of this equipment. In addition, this seminar will cover in detail the basic design, operating characteristics, specification, selection criteria, advanced fault detection techniques, critical components and all preventive and predictive maintenance methods in order to increase reliability of the equipment and reduce the operation and maintenance cost.

This seminar will provide the following information for all types of generators, exciters, automatic voltage regulators (AVR’s), and protective systems:

  • Basic Design
  • Specification
  • Selection Criteria
  • Sizing Calculations
  • Enclosures and Sealing Arrangements
  • Codes and Standards
  • Common Operational Problems
  • All Diagnostics, Troubleshooting, Testing, and Maintenance

Who should attend

  • Engineers of all disciplines
  • Managers
  • Technicians
  • Maintenance personnel
  • Other technical individuals (this seminar is suitable for individuals who do not have an electrical background)

Benefits to participants

  • Equipment Operation: Gain a thorough understanding of the operating characteristics of generators, exciters, automatic voltage regulators (AVR’s), and protective systems
  • Equipment Diagnostics and Inspection: Learn in detail all the diagnostic techniques and inspections required of critical components of generators, exciters, automatic voltage regulators (AVR’s), and protective systems
  • Equipment Testing: Understand thoroughly all the tests required for the various types of generators, exciters, automatic voltage regulators (AVR’s), and protective systems
  • Equipment Maintenance and Troubleshooting: Determine all the  maintenance and troubleshooting activities required to minimize the downtime and operating cost of generators, exciters, automatic voltage regulators (AVR’s), and protective systems
  • Equipment Repair and Refurbishment: Gain a detailed understanding of the various methods used to repair and refurbish generators, exciters, automatic voltage regulators (AVR’s), and protective systems
  • Equipment Rewind and Upgrade Options: Discover all options available to rewind and upgrade the generator rotor and stator to enhance the output and reduce downtime
  • Efficiency, Reliability, and Longevity: Learn the various methods used to maximize the efficiency, reliability, and longevity of generators, exciters, automatic voltage regulators (AVR’s), and protective systems
  • Advanced Methods to Prevent Failure:  Gain a thorough understanding of all the methods used to prevent partial discharge, and other failures in generators, exciters, automatic voltage regulators (AVR’s), and protective systems
  • Equipment Sizing: Gain a detailed understanding of all the calculations and sizing techniques used for generators, exciters, automatic voltage regulators (AVR’s), and protective systems
  • Design Features: Understand all the design features that improve the efficiency and reliability of generators, exciters, automatic voltage regulators (AVR’s), and protective systems
  • Equipment Selection: Learn how to select generators, exciters, automatic voltage regulators (AVR’s), and protective systems by using the performance characteristics and selection criteria that you will learn in this seminar
  • Equipment Enclosures and Sealing Methods Learn about the various types of enclosures and sealing arrangements used for generators, exciters, automatic voltage regulators (AVR’s), and protective systems
  • Equipment Commissioning: Understand all the commissioning requirements for generators, exciters, automatic voltage regulators (AVR’s), and protective systems
  • Equipment Codes and Standards: Learn all the codes and standards applicable for generators, exciters, automatic voltage regulators (AVR’s), and protective systems
  • Equipment Causes and Modes of Failure: Understand causes and modes of failure of generators, exciters, automatic voltage regulators (AVR’s), and protective systems
  • System Design: Learn all the requirements for designing different types of generators, exciters, automatic voltage regulators (AVR’s), and protective systems

Training methodology

The instructor relies on a highly interactive training method to enhance the learning process. This method ensures that all the delegates gain a complete understanding of all the topics covered. The training environment is highly stimulating, challenging, and effective because the participants will learn by case studies which will allow them to apply the material taught to their own organization.

Special feature

Each participant will receive a copy of the following materials written by the instructor:

  • Generator Inspection, Maintenance and Refurbishment Manual (this manual covers all the inspection and maintenance activities as well as all protective systems required for generators - 300 pages)

Program outline

Day 1 - Synchronous Generators, Generator Stator and Rotor Construction, Generator Components, Auxiliaries and Excitation

  • Synchronous machines, physical description, pole pitch: electrical degrees, synchronous machine windings, field excitation, rotating rectifier excitation, series excitation, no-load and short-circuit values, torque tests, speed-torque characteristic, excitation of a synchronous machine, machine losses
  • Synchronous generators, construction, speed of rotation of a synchronous generator, equivalent circuit of a synchronous generator, power and torque in a synchronous generator, synchronous generator operating alone, parallel operation of ac generators, frequency-power and voltage-reactive power characteristics, synchronous generator ratings, synchronous generator capability curves, short-time operation and service factor
  • Generator stator construction, stator windings, stator insulation, forces on stator windings, stator endwinding support structure, generator rotor construction, rotor windings, rotor insulation, retaining rings, rotor endwinding structure
  • Generator components, auxiliaries and excitation, the rotor, rotor windings, rotor end rings, wedges and dampers, sliprings, brushgear and shaft grounding, fans, rotor and threading alignment, vibration, bearings and seals,
  • The stator, stator core, core frame, stator windings, end winding support, electrical connections and terminals, stator winding cooling components, hydrogen cooling components, stator casing,
  • Cooling systems, hydrogen cooling, hydrogen cooling systems, shaft seals and seal oil systems, thrust-type seal, journal-type seal, stator winding water cooling systems, Excitation, AC excitation systems, exciter transient performance, pilot exciter, main exciter, exciter performance testing, pilot exciter protection, brushless excitation systems, rotating armature main exciter
  • The voltage regulator, power system stabilizer, characteristics of generator exciter power systems (GEP), generator operation

Day 2 - Generator Main Connections, Generator Surveillance and Testing, Advanced Methods for Preventing Partial Discharge, Performance and Operation of Generators

  • Generator main connections, isolated phase bus bar circulatory currents, system description
  • Inspection practices and methodology, site preparation, foreign material exclusion, experience and training, safety procedures – electrical clearances, inspection frequency, generator accessibility, inspection tools, inspection forms
  • Generator surveillance and testing, generator operational checks (surveillance and monitoring), generator diagnostic testing, insulation resistance and polarization index, dc hipot test, ac tests for stator windings, synchronous machine rotor windings, partial discharge tests, mechanical tests
  • Advanced methods for protecting the generator stator bars from partial discharge, causes of partial discharge, controlling partial discharge using antimony-doped tin oxide filler material, advanced methods for Preventing partial discharge in generator stator bars, modern US patents for preventing partial discharge
  • Generator systems, condition monitoring, operation limitations, fault conditions

Day 3 - Generator Inspection and Maintenance, Generator Rotor Reliability and Life Expectancy, Generator Upgrades and Rewinds, Double Feed Generators, Power Station Electrical Systems and Design Requirements, Power Station Protective Systems, Frequently Asked Questions

  • Generator inspection and maintenance, on-load maintenance and monitoring, off-load maintenance, generator testing
  • Generator operational problems, and refurbishment options, typical generator operational problems
  • Generator rotor reliability and life expectancy, generator rotor refurbishment, generator rotor modifications, upgrades, and uprates
  • Generator upgrades and rewinds, rewinding for increased reliability, rewinding for increased output or efficiency, stator windings, rotor windings, impact on other components
  • Stator windings, slot support system, end winding support, asphalt conversions, emergency situations, complete rewind, partial rewind, repair of bars, stator winding insulation, stator winding quality
  • Field rewinds, overall design approach, component design, additional field considerations, field coil slot wedges, retaining rings, collector rings and bore copper, field winding quality, spare rotor
  • Other generator equipment and auxiliaries, excitation equipment, removable cartridge brush holders, coolers, control cabinets, babbitted hydrogen seals, generator gas monitoring system and tagging compounds, air gap flux probe, shaft voltage monitor
  • Double-feed generators, system configuration, equivalent circuit for the brushless double-fed machine, parameter extraction, generator operation, converter rating, machine control
  • Bearings and Lubrication, Types of bearings, ball and roller bearings, thrust bearings, lubrication, viscosity of lubricants, greases, VI improved oils
  • Used oil analysis, test description and significance, visual and sensory inspection, chemical and physical tests
  • Vibration analysis, resonance, vibration instrumentation, vibration analysis, vibration causes, vibration severity
  • Power station electrical systems, and design requirements, system requirements, electrical system description, system performance, unit start-up, synchronization,  shutdown and power trip, power plant outages and faults, uninterruptible power supply systems, dc systems
  • Power station protective systems, design criteria, generator protection, dc tripping systems
  • Frequently asked questions