EDON Case Study: Old Transformers Replacement - Groningen saves 1.2 million kWh per year

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EDON Case Study Old Transformers
Replacement - Groningen saves 1.2 million kWh
per year

• Piet Staal
• EDON

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About EDON

• Utility company
• North-East Netherlands
• 800,000 clients

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North Netherlands
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Project Groningen 1982

• SAVING ENERGY by replacing old transformers
• Old transformers still use warm rolled steel
  lt 1955
• New ones, standard or special design?

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City of Groningen
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Old Transformers

• Constructed before 1940
• Constructed between 1948 and 1951
• Constructed between 1951 and 1955

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Low voltage network

• Meshed network
• Cables in closed loops, double feed
• Transformers in parallel operation

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Transformer peak loading

• Individual between 0,4 and 1,1
• Mean value 0,65
• Load adapted by exchange schedules

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Replacement Programme
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New design 400 kVA
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Groningen Choice

• Type E lowest total owner cost
• Type C more energy efficient
• THE QUESTION IS
• HOW MUCH MORE INVESTMENT FOR HIGHER EFFICIENCY?