On-load tap changer, method for installing a load transfer switch insert in the on-load tap changer, and kerosene drain screw
AssigneeMaschinenfabrik Reinhausen GmbH
InventorsKlaus Hoepfl, Silke Wrede, Hubert Zwirglmaier
Life of this patent
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Abstract
An on-load tap changer has a switching tube, an oil suction pipe arranged centrally and coaxially along an axis inside the switching tube, and a kerosene drain screw so mounted in a base of the on-load tap changer that it is coaxial with an axis of the oil suction pipe, with the axis of the switching tube, and with an axis of the on-load tap changer. A bearing ring is so acted on by a resilient element at one side and radially with respect to the axis of the on-load tap changer that the switching tube and the oil suction pipe both mechanically positively cooperate with the bearing ring and are centered about the axis of the on-load tap changer.
Claims16
An on-load tap changer comprising:
- a switching tube;
- an oil suction pipe arranged centrally and coaxially along an axis inside the switching tube;
- a kerosene drain screw so mounted in a base of the on-load tap changer that it is coaxial with an axis of the oil suction pipe, the axis of the switching tube and an axis of the on-load tap changer;
- and
- a bearing ring so acted on by a resilient element at one side and radially with respect to the axis of the on-load tap changer that the switching tube and the oil suction pipe both mechanically positively cooperate with the bearing ring and are centered about the axis of the on-load tap changer.
A method of mounting a load changeover switch insert with a switching tube and an oil suction pipe in an on-load tap changer, the method comprising the following steps:
- inserting the load changeover switch insert together with the switching tube into an oil tank of the on-load tap changer such that the switching tube is offset from an axis of the on-load tap changer;
- positioning the switching tube that has a bearing at a lower end, on a bearing ring that is acted on at one side and radially with respect to the axis of the on-load tap changer by a resilient element such that an axis of the switching tube is offset from the axis of the on-load tap changer;
- placing the oil suction pipe on a domed protrusion that is formed on the base in fixed location coaxially with respect to the axis of the on-load tap changer such that a guided positioning is made possible by a cone guide at an inner side of the switching tube;
- and
- centering the switching tube and the oil suction pipe with respect to the axis of the on-load tap changer by urging the bearing ring by the resilient element to be centered with respect to the axis of the on-load tap changer by the cooperation of a suction stub pipe at the lower end of the oil suction pipe, with the bearing ring and with the stationary domed protrusion of the base.
A kerosene drain screw in a base of an on-load tap changer, mounted on a domed protrusion of the base of the on-load tap changer to be movable in the direction of an axis of the on-load tap changer, and carrying a cover disk by which at least one opening for kerosene in the base of the on-load tap changer is closable and openable.
Dependencies are inferred from the claim text.