G305 - Generators Maintenance & Testing

1.5 days - 1.0 Continuing Education Units Awarded
On-Site-Only

There are NO SMALL PROBLEMS when it comes to your GENERATOR!! Be prepared. 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!!

REGISTRATION / SCHEDULING NOTE: This course is that last 1.5 days of HPC Technical Services' course called Generator Technologies, G401. For information on what is included in the first three days, please consult our website on this course. We recommend attendance in G401, but recognize there is somewhere their interests lie in maintenance ONLY, so we offer this option.

OBJECTIVES
Upon successful completion of this course the participant should 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.

TOPICAL OUTLINE

1. Day One
   1. Outage Planning & Scheduling:  Why Maintenance, Preparation, Tooling, Documentation, Pre-Shutdown Maintenance, Decision Making
   2. Generator Mechanical Maintenance Activities:  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.  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.
2. Day Two
   1. Purpose of Generator Electrical Tests: Safety Considerations, STATOR:  Winding Resistance, Insulation Resistance, Dielectric Absorption, Direct Current Leakage, Dissipation Factor Test, Radio Noise (Corona), High Potential Test, Ring Test, EL-CID and for the ROTOR: Resistance Test, PI, Impedance Testing, Flux Pattern Test, Pole Drop, High Potential Testing, Air Gap Flux Probe Testing.