The Journey of Snowy's Oldest Hydro Generator


Kapila Nanayakkara
Snowy Hydro Limited

Evan Bayliss
Snowy Hydro Limited

Guthega was the first power station commissioned at Snowy Hydro, and having performed some 60 years of strong service was finally showing its age, with stator vibrations of one of the units at critical levels.

This powerpoint covers the following:

  1. Health Assessment of the generator fleet

  2. Past history and relevant plant data

  3. Current issues of Unit 1 and how they are managed

  4. Reasons to replace only one generator

  5. Significant design requirements for the new generator and design improvements

  6. Managing QA

  7. Going beyond IEC 60034 test acceptance criteria

  8. Risk assessment and controls

Kapila Nanayakkara B Eng(Hons); Post Grad. Dip. Eng; MBA, MIE.
Kapila has more than forty years experience since graduation  in electrical power generation industry spanning across Srilanka, UK and Australia. He has been with Snowy Hydro for 27 years and presently hold the position of Principal Electrical Engineer in Asset Management and Engineering Group. He has done several presentations on generators in US, New Zealand, Sri Lanka and Australia and an active member of CIGRE AP1 rotating machines and CEATI HPLIG.

Evan Bayliss is a Chartered Professional Electrical Engineer with five years’ experience in power generation engineering. He holds a first-class honours degree in Electrical Engineering from the Central Queensland University. He has worked in various location in Australia, primarily in the operations and maintenance of coal-fired and hydro generators. Since 2016 he has worked in the Asset Management and Engineering team in Snowy Hydro, focussing on the maintenance of transformers, generators and other HV equipment. More recently, he has been seconded as an electrical engineer for the development of the tender design for Snowy 2.0.