Hitachi Energy Ltd

Sebastian Seier

Tor Laneryd

Jan Czyzewski

Nils Lavesson

Johan Dahlgren

A method for obtaining an improved transformer design for a power plant, including the steps of defining one or more critical temperatures (θ, θ, θ, θ) in the operation of the transformer, determining a limit (θ, θcontingency, θh, θ) for at least one of the critical temperatures and obtaining an adjusted design of the transformer by using a data set of transformer loading, the data set comprising the amount of time (H) at a specific load level (κ) for a specific ambient temperature (θ). The method further includes the step of producing a transformer having the adjusted values of the design parameters (Δθ, Δθ, R, x, y) and/or using a transformer having the adjusted values of the design parameters (Δθ, Δθ, R, x, y) in the power plant.

Method for obtaining an improved transformer design for a power plant

An electric device includes a tank and a cable box connected to the tank, the tank and the cable box being filled with an insulating liquid electric connection system for connecting a power cable through the cable box to the tank and a current measuring device for measuring electric current in the electric connection system, wherein the current measuring device is located adjacent to a housing of the cable box.

Electric device comprising liquidfilled tank and cable box with current measuring device

Provided is a static electric induction arrangement including: a static electric induction device arranged in a static electric induction device tank; an accessory tank including at least one opening configured to receive an accessory therein; the static electric induction device tank and the accessory tank are intended to be filled with dielectric fluid and are connected via a fluid connection, an upper portion of a cross section of the fluid connection, is located at a first height, the arrangement comprises a heat exchanger connected to the device tank, the device tank includes an outlet that is arranged to lead the dielectric fluid to the heat exchanger and an inlet that is arranged to return the dielectric fluid from the heat exchanger.

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Bad Honnef, Germany

Sebastian Seier