| Patent application number | Description | Published |
|---|
| 20080248700 | Contact Arrangement - The invention relates to a contact arrangement in which an electrical contact of U-shaped construction is fixed in common by two contact holders, which surround it at the top and bottom, and selectably also upper and lower screening caps, by means of two pins which go through corresponding bores not only of the described components, but also of the insulating rod at which the fastening shall take place. | 10-09-2008 |
| 20080302639 | Tap Changer Having a Switching Monitoring Device - The invention relates to a tap changer having a switching monitoring device, which is arranged above the upper transmission stage in a housing. For monitoring purposes, two cam switches are provided which are actuated by a cam disk which is connected to the contact-bearing switch column of the tap changer. The cam disk has a horizontally split contour at its end face, wherein one of the two cam switches runs on each partial contour. | 12-11-2008 |
| 20090140705 | Device for Regulating Electrical Voltage - The invention relates to a device for regulating the electrical voltage in power mains, comprising a regulating transformer. Optionally interconnecting only three winding taps and a separate reactor winding with a total of four switching elements, enables five different voltage levels to be set. | 06-04-2009 |
| 20110063064 | POWER TRANSFORMER HAVING A STEPPING SWITCH - The abstract relates to an arrangement of an oil-filled power transformer having an oil-filled stepping switch, wherein only a single oil expansion vessel is provided, this oil expansion vessel being connected both to the oil volume of the stepping switch and also to the transformer tank, which is likewise oil-filled, via corresponding flanges. | 03-17-2011 |
| 20110102056 | METHOD FOR SWITCHING WITHOUT ANY INTERRUPTION BETWEEN WINDING TAPS ON A TAP-CHANGING TRANSFORMER - The invention relates to a method for switching without any interruption between two winding taps (tap n, tap n+1) of a tap-changing transformer, wherein each of the two winding taps is connected to the common load output line via in each case one mechanical switch (Ds) and a series circuit, arranged in series thereto, comprising two IGBTs (Ip, In) which are switched in opposite directions. | 05-05-2011 |
| 20110133817 | TAP SWITCH WITH SEMICONDUCTOR SWITCHING ELEMENTS - The invention relates to a tap switch for uninterrupted changeover between two winding taps (tap n, tap n+1) of a tapped transformer, wherein each of the two winding taps is connected to the common outgoing load line via in each case a mechanical switch (Ds) and a series circuit which is arranged in series therewith and which is composed of two oppositely connected IGBTs (Ip, In). According to the invention, each IGBT is bridged by in each case a specially dimensioned varistor (Vp, Vn) connected in parallel therewith. | 06-09-2011 |
| 20120025789 | ON-LOAD TAP CHANGER COMPRISING SEMICONDUCTOR SWITCHING ELEMENTS - The invention relates to an on-load tap changer comprising semiconductor switching elements for uninterrupted switching between winding taps of a tapped transformer. According to the invention, contact bars are provided which extend in the direction of the path of the fixed tap contacts and can be contacted using contact bridges that can be jointly moved by a contact slide in such a way that direct electrical connections to the charge diverter and electrical connections to the inputs and the output of the semiconductor switching elements can be established. | 02-02-2012 |
| 20120032654 | ON-LOAD TAP CHANGER COMPRISING SEMICONDUCTOR SWITCHING ELEMENTS - The invention relates to an on-load tap changer comprising semiconductor switching elements for uninterrupted switching between fixed tap changer contacts which are electrically connected to winding taps of a tapped transformer. Each of the fixed tap changer contacts can be connected to a charge diverter either directly or, during switching, via the semiconductor switching elements that are connected therebetween. According to the invention, the charge diverter has fixed, divided diverting contact pieces in order for the semiconductor switching elements to be electrically isolated from the transformer winding during stationary operation. | 02-09-2012 |
