Hitachi Energy Ltd

Hitachi Energy Switzerland Ag

Jean Louis Gérard Mathae

Tommy Larsson

Per Krainer

Christer Arnborg

Anders C Johansson

Harald Hedsten

Magnus Svanberg

Per Algot Sundqvist

Daniel Forsman

Kristoffer Olofqvist

Kevin Ketabi

A tap changer arrangement including a tap changer housing having a longitudinal extension along a first axis, wherein the tap changer housing comprises a first interface part fixedly attachable to a support structure of a transformer tank, a second interface part at a distal part of the tap changer housing, and an intermediate housing part arranged between the first interface part and the second interface part, the first interface part, the intermediate housing part and the second interface part being arranged on the first axis. The tap changer arrangement includes a plurality of support elements that is mechanically connected to the second interface part and either mechanically connected to the first interface part or to a support structure of the transformer tank, the support elements being configured to exert a compressive force on the intermediate housing part from the first interface part and from the second interface part.

Tap changer arrangement and a transformer arrangement comprising the tap changer arrangement

A contact assembly including a first contact member electrically connected to a first electrical terminal, a second contact member electrically connected to a second electrical terminal, and a third contact member movable into and out of contact with the second contact member. An elastically deformable fourth contact member ensures electrical contact between the first contact member and the second contact member and the contact assembly is configured such that the fourth contact member is increasingly compressed between respective abutment surfaces of the first contact member and the third contact member as the third contact member moves towards the second contact member, thereby resiliently deforming the fourth contact member. Also, an electrical circuit breaker and an electrical switch, respectively including such a contact assembly. Further, a vacuum interrupter including such an electrical circuit breaker.

Contact assembly

The present invention relates to an On-Load Tap Changer (OLTC) for connection to a regulating winding of a transformer, the regulating winding enclosed in a transformer tank, wherein the transformer tank includes insulating liquid, the OLTC comprising: a switching device including: a main contact, and a resistor contact, wherein the main contact and the resistor contact are configured to be arranged directly in the insulating liquid and that they are configured to be physically separated from the insulating liquid, and wherein the main contact is enclosed in a main contact enclosure and the resistor contact is enclosed in a resistor contact enclosure. The present invention further relates to a transformer comprising the OLTC as disclosed herein.

On-load tap changer

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Ludvika, Sweden

Jean Louis Gérard Mathae