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Slough, Berkshire


Client: Undisclosed
Location: Slough, Berkshire
Objective: Installation & commissioning of 1 x 20/40MVA, 33/11.5kV transformer.

Scope of Work

  • Design, manufacture and testing of 1 x 20/40MVA, 33/11.5kV,  power transformer.
  • Full in-house routine,  lighting impulse, noise, temperature rise & partial discharge testing.
  • The 50ton transformer was delivered fully built using a  low loader vehicle then skidding into position by Colletts & Son’s heavy lift team.
  • Full commissioning works as per the customers specification which includes; insulation resistance of each winding, core & secondary circuits, transformer ratio check, vector group check by 3 phase low voltage energization of transformer, checks on all CTs & VTs for insulation resistance, ratio & magnetization curves, operation of tapchanger through range & operation of limit switches, operation of protection equipment, oil sampling for routine, water & dissolve gas analysis.
  • All site works was complete within 3 days of collection of the transformer from Winder Power, Pudsey.



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