Tap changer and vacuum switching tube for such a tap changer

摘要

A tap changer for uninterrupted switching over between winding taps of a tapped transformer has two load branches each for a respective phase to be switched. Each load branch has a vacuum switching contact acting as main contact and parallel thereto at least one series connection of a switch-over resistance and a respective further vacuum switching contact. The two load branches are connected with a common load shunt or connectable by mechanical switching elements. Two respective vacuum switching contacts of each load branch are constructionally combined to form a single vacuum switching tube with two separate movable contacts actuatable independently of one another and a common fixed contact. The common fixed contact is connected with the common load shunt or connectable mechanical switching contacts.

主权项

1. A tap changer for uninterrupted switching between winding taps of a tapped transformer and for connecting the winding taps to a common load, the tap changer comprising for each phase to be switched:
two load branches each connected directly or through a mechanical switch to the common load tap and having
a first vacuum switching contact acting as main contact andparallel thereto a switch-over resistance and a respective second vacuum switching contact in series therewith, a single vacuum switching tube holding the first and second two vacuum switching contacts of each load branch, the first and second vacuum switching contacts being movable and actuatable independently of one another in the respective tube and a respective fixed contact in each of the tubes, engageable with the first and second switching contacts of the respective tube, and connected with the common load shunt directly or by a mechanical switch.