vG305 – Principles Of Generator Maintenance & Testing

vG305 – Principles Of Generator Maintenance & Testing

4 days (4-hours sessions) - 16 PDH Credits Awarded



There are NO SMALL PROBLEMS when it comes to your GENERATOR!!  Be prepared for your next outage.  Make sure you fully understand Safety, Testing, Inspection/Repair as well as disassembly/reassembly.  Don't be surprised.  Be prepared.  Register for this course today.  This course is designed for plant engineers who have a specific need to better understand generator equipment.  Plant electrical and mechanical maintenance technician’s benefit as well.

  • Corona discharge, what does that mean?
  • How do you repair fused stator punchings?
  • What components should be high potential tested?
  • How can we avoid accidental injury when testing the generator?
  • What are the probable causes of grounded fields?
  • ...And the list of answered questions goes on!!


Upon completion of this course, participants will be able to:

  1. Describe the major activities associated with generator maintenance.
  2. Describe proper generator disassembly and reassembly sequences.
  3. Describe the procedures for cleaning generator components.
  4. Describe the procedures for inspection of generator components.
  5. Given any generator component, describe the types of damage that might be found, and what are probable causes of that damage.
  6. Describe the various repair methods for defective component condition.
  7. List all those electrical tests commonly performed on large AC generators.
  8. For each electrical test listed, describe the purpose of conducting that test; i.e., what are we looking for as a result of the test?
  9. Describe the procedures for the various generator tests.
  10. List and describe safety precautions for the conducting of these electrical tests.

Course dates / fee

This Virtual Instructor-Led Training session is scheduled to be delivered over 4 one-half days.  See for detail on the course dates / locations / and registration fees.

HPC Technical Services reserves the right to cancel any course/seminar within 10-working days of the scheduled date.  Fees are 100% refunded or credited to another Seminar (clients' choice) if HPC should cancel any Seminar.


All HPC instructors are educated ‘experts’ on the subjects they teach, with years of relevant hands-on experience (typically 20+ years), and have proven instructional skills. Brief resumes can be looked up on HPC’s website, 

Course Topical Outline

Day One: 

Introduction (1 hour)

Outage Planning & Scheduling (1 hour):  Why Maintenance, Preparation, Tooling, Documentation, Pre-Shutdown Maintenance, Decision Making

Disassembly (2 hours)

Day Two:

Generator Stator Maintenance Activities (4 hours):  Why Generators Fail, Special Tools, Spare Parts, Safety Precautions, Disassembly/Reassembly Procedure, Cleaning and Checklists.  Stator Visual Inspection to include; Loose Slot Wedges, Discoloration, Loose Punchings, Bar Vibration, Girth Cracks, Corona, Loose/Broken Ties, Liquid Connections, Air Baffles, Oil Deflectors, and Hydrogen Seals.

Day Three:

Generator Rotor Maintenance Activities (3 hours): Rotor Visual Inspection to include Collector Rings, Rotor Journal Surface, Terminal Studs, Hydrogen Seal areas, Axial Flow Fans, End Turns, Field Slot Wedges, Retaining Rings.

Generator Electrical Tests (1 hour): Safety Considerations

Day Four:

Generator Stator Electrical Tests (2 hours): Winding Resistance, Insulation Resistance, Dielectric Absorption, Direct Current Leakage, Dissipation Factor Test, Radio Noise (Corona), High Potential Test, Ring Test, EL-CID

Generator Rotor Electrical Tests (1 hours): Resistance Test, PI, Impedance Testing, Flux Pattern Test, Pole Drop, High Potential Testing, Air Gap Flux Probe Testing.

Course Conclusion

Frequently asked questions

  • Will HPC Technical Services offer this course for our personnel only? YES, call or email Stephen Parker, for a price quotation.
  • Will HPC Technical Services customize the presentation to suit our particular needs?
  • Is HPC Technical Services' textbook available for purchase as a reference document? Yes our Generator Maintenance text is available at  $219 + S&H.
  • Can HPC Technical Services provide "Technical Assistance" in the planning and implementation of our outages? Yes we can.  Call or contact Stephen Parker, for our rate sheets and any further information required.

What you will receive

  1. 1 copy of HPC Technical Services' textbook, Generator Maintenance, a $219 value, as written by Harold Parker, with technical support by via HPC's Advanced Generator Maintenance Seminar personnel, primarily AGT Services. This text contains a significant number of equipment photographs, graphics and data tables.  It is a valuable desktop reference in addition to being able to enhance the learning process.
  2. A Certificate of Completion with 14 PDH