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Wettingen HPP Rehabilitation Project

Rehabilitation of the Wettingen HPP (30 MW) and extension by a new 40 MVA substation for the power supply to the communities of Neuenhof and Wettingen in Switzerland

Description of project:

The power plant was originally implemented between 1930 and 1933. The following systems and components needed to be rehabilitated mainly due to age of equipment, safety requirements, optimization of the system design, legal requirements and lack of spare parts.

  • 1 110 kV HV-Switchgear (7 bays, replacement with SF6-gas insulated)
  • 1 16 kV MV-Switchgear (8 bays, extension)
  • 3 12 kV Generator Switchgears (3, 6, 4 bays)
  • 1 400 V LV-Switchgear (4 bays)
  • 1 110/16 kV Power Transformer (40 MVA, extension)
  • 3 110/6,4 kV Unit Transformers (12,5 MVA)
  • 1 6,4/0,4 kV Auxiliary Transformer (630 kVA)
  • 1 Emergency Diesel (500 kVA)
  • HV-/MV-Cabling
  • LV-/Control Cabling
  • Earthing system and lightning protection

ÅF's services:

  • Development and update of the system design and the single line diagram
  • Clarification and definition of the scope and the limits of supply with the Employer and the grid operator
  • Development and optimization of the system layout and the arrangement concept
  • Elaboration of the arrangement drawings (outline and sectional drawings)
  • Detail design, overall time schedule, detailed planning of the sequential rehabilitation unit by unit
  • Preparation of Tender Documents, Public competitive Bidding in accordance with GATT/WTO, Tender Evaluation, Evaluation Reports, Contracts
  • Technical assistance to the Contractors during design und manufacturing, approval of Contractor’s detail design, interdisciplinary check of supply limits, verification of the included scope of supply
  • Overall construction and implementation supervision and coordination including all disciplines
  • Factory Acceptance Tests, Site Acceptance Tests, commissioning and start of operation
  • Commercial supervision of the Contracts, Project accounting, settlement of claims and disputes, final documentation

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