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Crediton Devon

Installation & commissioning of 2 x 7.5/15MVA, 33/11.5kV transformers

Client:
Undisclosed

Crediton, Devon

Scope of work

Design, manufacture and testing of 1 x 7.5/15MVA, 33/11.5kV power transformer.
This unit was the first of its kind, designed and manufactured by Winder Power with the new vacuum VBO tapchanger.
The tank’s design caters for all variances of terminations (cable box or bushings/turrets). The same tank can be used for compact radiators or separate cooler bank designs. The marshalling kiosk is standardised so that one size covers all options.
Full in-house routine, lightning impulse, noise, temperature rise, partial discharge & SFRA testing.

Delivery using a semi-low loader then off-loading via hydraulic jacking and skating with a single-directional skid.

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 energisation of transformer,
Checks on all CTs & VTs for insulation resistance,
Ratio & magnetisation curves,
SFRA,
Operation of tapchanger through range & operation of limit switches,
Operation of protection equipment,
Oil sampling for routine,
Water & dissolve gas analysis.

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