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 |
20120112730 | ARRANGEMENT OF A STEPPING SWITCH ON A CONTROL TRANSFORMER - The invention relates to the arrangement of a stepping switch on a control transformer, wherein either only the mechanical contact system ( | 05-10-2012 |
20130170079 | ON-LOAD TAP CHANGER - The invention relates to an on-load tap changer for switching among winding taps of a step transformer without interruption. According to the invention, in each auxiliary current branch of the on-load tap changer, which operates with vacuum switching tubes as switching elements, additional switches are provided in series with the vacuum switching tubes and the respective winding tap. Said additional switches cause a complete galvanic isolation of the vacuum switching tubes in the auxiliary current branches in steady-state operation. | 07-04-2013 |
20130213777 | TAP CHANGER - The invention relates to a tap changer for switching among winding taps of a step transformer without interruption, said step transformer having an oil-filled transformer tank, wherein the tap changer does not have a separate housing or a housing that completely encloses the tap changer and is arranged on the outside of or inside the transformer tank connected to the oil filling of the step transformer. | 08-22-2013 |
20130220782 | TAP CHANGER AND VACUUM SWITCHING TUBE FOR SUCH A TAP CHANGER - 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. | 08-29-2013 |
20140197816 | TAP CHANGER - The invention relates to a stepping switch for voltage control, comprising semiconductor switch elements on a variable transformer having associated regulating windings. The stepping switch has a modular design, wherein each module comprises a respective sub-winding of the regulating winding which can be activated or deactivated by semiconductor switch elements. | 07-17-2014 |
20140354390 | TAP CHANGER - The invention relates to a tap changer for voltage regulation, comprising semiconductor switch units (S | 12-04-2014 |
20140375407 | TRANSFORMER WITH ON-LOAD TAP CHANGER - The invention relates to a transformer with a tap changer, wherein optionally the primary or secondary side can be regulated by the tap changer, and wherein, on the side of the transformer to be regulated, a main winding and at least one regulating winding, which is connectable by the tap changer, are provided. According to the invention, the main winding is divided into two main winding parts, and the at least one regulating winding and the tap changer ( | 12-25-2014 |
20150022303 | CONTROL TRANSFORMER - The invention relates to a control transformer that is designed as a phase-shifting transformer, wherein semiconductor switching components are provided for each phase at a regulating winding with several partial windings. According to the invention, an additional connecting line with an additional electronic switching component is provided in each phase wherein each of these connecting lines connects a module of the respective phase with the end of the main winding of the adjacent phase. | 01-22-2015 |