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| Number | Title | Issue Date |
| 8153916 | Tap changer switch A transformer switch, such as a dual voltage switch or a tap changer. The switch includes a cover, a housing, and a rotor sandwiched between the cover and the housing. The cover and housing are molded from a non-conductive plastic. An interior space of the cover inc... | 04/10/2012 |
| 8119939 | On-load tap changer with an energy storage mechanism The invention relates to an on-load tap changer having an energy storage mechanism for changing over, without any interruptions, between different winding taps of a tap-changing transformer on load. According to the invention, the energy storage mechanism has one or... | 02/21/2012 |
| 8030583 | Switching arrangement The invention relates to a switching arrangement with two operational settings for switching over a winding during transformer operation, wherein during the switching-over a transient current commutates from one current path to another current path. In that case fix... | 10/04/2011 |
| 8013263 | Multi-deck transformer switch A transformer switch, such as a multi-deck tap changer, includes an assembly with a first housing coupled to a first cover. The first cover holds at least a first stationary electric contact. A second housing is formed integrally with the first cover, and is coupled... | 09/06/2011 |
| 7982142 | Diverter switch, a method for operating such a switch and use of such a switch A diverter switch with an operating member and an electric circuit. The electric circuit has a main branch and a resistance branch connected in parallel with the main branch. Each branch includes a contact and a vacuum switch. The resistance branch also includes a r... | 07/19/2011 |
| 7977589 | Measuring contact sequence in a tap changer A tap changer and a method for measuring a contact sequence of a tap changer is provided. The tap changer includes a cylinder and a shaft that is rotatably arranged inside the cylinder, the cylinder is provided with fixed contacts, the shaft is provided with a conta... | 07/12/2011 |
| 7977588 | Load tap changer position sensor An on-load tap changer position sensor includes a series of radially spaced reed switches and a magnetic indicator that is rotated by a shaft that is coupled directly or indirectly to a load tap changer. As the position of the magnetic indicator changes, the locatio... | 07/12/2011 |
| 7928329 | Tap changer A tap changer is filled with an insulating liquid as well as devices for absorbing variations in the volume of the insulating liquid due to thermal conditions. A gas cushion is provided which is integrated into the tap changer vessel and is formed by members that ab... | 04/19/2011 |
| 7872203 | Dual voltage switch A transformer switch, such as a dual voltage switch or a tap changer. The switch includes a cover, a housing, and a rotor sandwiched between the cover and the housing. The cover and housing are molded from a non-conductive plastic. An interior space of the cover inc... | 01/18/2011 |
| 7750257 | Molded polymer load tap changer A load tap changer connected to a power source to control voltage supplied from the power source to a load includes a base assembly that includes a base element onto which multiple stationary contacts that connect to taps of a winding of an electrical control device... | 07/06/2010 |
| 7679012 | High-voltage automatic changeover switch A high-voltage automatic changeover switch, includes a support and a control circuit board mounted on the support. In one embodiment, the support includes an insulating frame, four high-voltage contacts mounted on each of two opposite plates of the insulating frame,... | 03/16/2010 |
| 7649147 | Off-circuit tap changer device An off-circuit tap changer device which includes a spring-biased moving contact that is operable to independent flex and roll. The moving contact includes one or more rings which are independently spring biased to a moving contact support. The device also includes a... | 01/19/2010 |
| 7550688 | 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-... | 06/23/2009 |
| 7408275 | Preventive maintenance tapping and duty cycle monitor for voltage regulator Automatically changing the tap position in a load tap changer includes noting a polarity of a first tap position of a load tap changer. A duration for which one or more consecutive tap positions of the load tap changer collectively have had the noted polarity also i... | 08/05/2008 |
| 7326865 | Switching device An electrical switching device including at least one ingoing conductor at least a first and a second outgoing conductor, and an arrangement for connecting and disconnecting the conductors by means of an axial movement. The arrangement includes an axially movable el... | 02/05/2008 |
| 7265305 | Multiple switch device and electronic device employing the same A multiple switch device for controlling and linking a plurality of switches (600) disposed on a circuit board (500) comprises an operation button (110), a shaft (120), and at least one fixing base (130). The operation button compr... | 09/04/2007 |
| 7232965 | Linear motion compensator An linear motion compensator for translating a particular amount of linear movement produced by an input device into a particular amount of linear movement required to properly operate an output device, without causing damage to either the input device or the output... | 06/19/2007 |
| 7049795 | Underload tapchanging voltage regulators for ease of field replacement and for improved operator safety Under load tapchanging voltage regulators with source and load connections, series and shunt transformers, switching devices for causing selectable levels of electric power to flow in either direction between the series and shunt transformers, and tapchanger control... | 05/23/2006 |
| 7049714 | Method for determining the condition of a rotary switch In a combination switch having both rotary and pushbutton momentary switches, a method for determining which switch has been selected by a user. The method also includes distinguishing between the selection of a rotary switch from a pushbutton switch. ... | 05/23/2006 |
| 7030593 | Multiple path variable speed constant frequency device having automatic power path selection capability The present invention relates to variable speed constant frequency (VSCF) devices and methods for maximizing engine generator efficiency. In one embodiment, a VSCF device may include at least two paths for conducting power to the load. One path, a line inductor path... | 04/18/2006 |
| 6998547 | On-load tap changer for a sequence switch A load changeover switch for a tap changer with two permanent main contact pairs for each phase to be switched, wherein the fixed contacts thereof are each time bridged over by a movable permanent main contact. The fixed permanent main contacts consist of a pluralit... | 02/14/2006 |
| 6982390 | Advanced instrument packaging for electronic energy meter An actuator switch for use in an electronic energy meter has a reduced number of parts, and can be used to actuate multiple concealed switches. An actuator switch includes an inner actuator portion having ribs separated by at least one gap, and an outer housing with... | 01/03/2006 |
| 6882070 | Electric motor having a terminal board An electric motor including having a housing, a stator fixed relative to the housing, a shaft rotatable about a motor axis, a rotor supported by the shaft for rotation with the shaft relative to the stator, a terminal board fixed relative to the housing, and first a... | 04/19/2005 |
| 6849813 | Step switch with selector The invention relates to a tap selector switch with a preselector for uninterrupted switching-over between different winding taps of a tapped transformer. The entire selector is in that case accommodated as a separate assembly in an own insulating material housing, ... | 02/01/2005 |
| 6838629 | Energy accumulator for a sequence switch A force-storing unit for a tap changer has an output shaft journaled in a support and a pair of parallel guide rods fixed on the support, defining a longitudinal direction, and spaced parallel to the shaft. A force-storing slide and an output part are displaceable l... | 01/04/2005 |
| 6833518 | Load tap changer with direct drive and brake A rotary tap changer is connected to a power source to control voltage supplied from the power source to a load. The rotary tap changer includes a motor having an output device, and a drive sprocket having a drive shaft positioned perpendicularly to a plane of rotat... | 12/21/2004 |
| 6825426 | Make-before-break selector switch A make-before-break selector switch for use in high-voltage applications allows power to a load to be switched from a first power source to a second power source such that the second connection is made before the first is broken. The selector switch includes a blade... | 11/30/2004 |
| 6693248 | Methods and apparatus for transferring electrical power A transfer switch includes a cam including a first groove and a second groove different from the first groove, a follower apparatus positioned in the second groove, and a driver apparatus positioned in the first groove, the driver apparatus configured to ... | 02/17/2004 |
| 6693247 | Load tap changer with direct drive and brake A rotary tap changer is connected to a power source to control voltage supplied from the power source to a load. The rotary tap changer includes a motor having an output device, and a drive sprocket having a drive shaft positioned perpendicularly to a pla... | 02/17/2004 |
| 6518771 | Method of monitoring the contact burnoff in tap changers A method of monitoring contact burnoff in tap changers operating under load in which the load current is measured and for nominal variation of the voltage of the particular tap parameters are stored which are used to calculate the burnoff rate per contact... | 02/11/2003 |
| 6307283 | Position signalling device for a motor drive A position indicator for step switches and tap selectors of transformers and the like has a contact array connected to the motor drive and connected by a plug to the plug of a connector which, in turn, is connected by plugs to the information-generating m... | 10/23/2001 |
| 6091032 | Tap changer A tap changer has a bypass switch with a rotary pair of movable contacts engaging arc segmental fixed contacts of a length greater than the spacing between the movable contact which spacing is greater than the spacing between the fixed contacts of the byp... | 07/18/2000 |
| 6087607 | Position signalling device The invention relate to a position signaling layout for a motor drive which also serves to activate an on-load tap changer, an off-circuit tap changer or a plunger core coil. Position signaling devices of this kind detect the position at a given time of t... | 07/11/2000 |
| 6060669 | Tap selector A multiphase reactor-switching tap selector has a single geneva mechanism operating three shafts which traverse phase plates carrying all of the contacts and the vacuum switching cell and rapid release mechanism for each of the phases. The geneva mechanis... | 05/09/2000 |
| 6008456 | Load switch for a step switch A load switch has a housing, a pair of main contacts fixed in the housing, and a movable main contact pivotal on the housing between end positions in each of which it engages a respective one of the fixed contacts and through a middle position in which it... | 12/28/1999 |
| 5847939 | Support mechanism for mounting a center bolt LBOR and the like A center bolt LBOR switch 12 comprising a support ring 12-4 and a center bolt or threaded boss 12-2, and a nut 12-3 for securing the switch 12 to a transformer tank wall is disclosed. The disclosed invention allows a switch or other device to be mounted t... | 12/08/1998 |
| 5834717 | On-load tap changer of a step switch An on-load tap changer of a step switch has a force-storage unit which has a charging slide continuously movable by a bidirectionally rotatable drive shaft and an output part that when tripped suddenly follows the movement of the charging slide and rotate... | 11/10/1998 |
| 5786552 | Switching arrangement for load change-over switches of step switches and for selector switches The invention concerns a switching arrangement for load change-over switches of step switches and for selector switches, wherein two switching contacts movable in two directions are present. The first switching contact is in the form of a main switching c... | 07/28/1998 |
| 5693922 | Diverter switch and link system for load tap changer A load tap changer (LTC) comprising in part a diverter switch is disclosed. The diverter switch includes a movable main contact (38); first and second fixed main contacts (40a, 40b); a pantograph system (30) for translating a rotational motion of a shaft ... | 12/02/1997 |
| 5694034 | Tap changer for a tapped or stepped transformer A tap changing circuit has each tap of a power transformer connected with a selector vacuum switching cell. The odd numbered cells and the even numbered cells are connected to respective sides of a load switch each including a further vacuum switching cel... | 12/02/1997 |
