| ABB Technology Ltd Patent applications |
| Patent application number | Title | Published |
|---|
| 20120129374 | TULIP CONTACT AND ELECTRICAL CONTACT SYSTEM FOR SWITCHING DEVICE - A tulip contact comprises a plurality of outer contact fingers and inner contact fingers. The outer contact fingers forming a shape of the outer surface of fixed contact in order to make the contact surface of each of these fingers contact with the outer surface of fixed contact. The inner contact fingers forming a shape of the inner surface of fixed contact in order to make the contact surface of each of these fingers contact with the inner surface of fixed contact. Each said contact finger comprises a first contact bulge for contacting with the surfaces of the fixed contact, and a second contact bulge for contacting with the bushing. And each said contact bulge comprises a contact slot on its surface. The first contact bulges of the outer contact fingers are not at the same cross section with the first contact bulges of the inner contact fingers. | 05-24-2012 |
| 20120109400 | LOAD SCHEDULING OPTIMIZATION IN DISTRIBUTED SYSTEM - A power distribution management system is disclosed for optimal power distribution for a predetermined class of loads and other loads. The power distribution management system include a substation for distributing power supply to a load network, where the load network includes the predetermined class of loads and other loads and the substation includes a plurality of feeders. The power distribution management system includes an optimizer for generating an optimal load schedule for a control period for the predetermined class of loads. The power distribution management system also includes a communication interface for communicating between the plurality of individual loads and/or the optimizer. | 05-03-2012 |
| 20120099478 | Method and Device for Auto-Generating Goose Signal Connection Topology from Substation Level - The invention provides a method and device for auto-generating GOOSE signal connection topology from substation level based on IEC61850 standard. The method comprises the following steps: import substation configuration language (SCL) file; search all GOOSE input and output signals under each access point; match the output signals to the input signals; and generate GOOSE signal connection topology based on the result of said matching. The device comprises an importing module for importing substation configuration language file; a GOOSE signal analyzer for searching all of GOOSE input and output signals under each access point, and matching said GOOSE output signals to said GOOSE input signals; and topology data module for generating GOOSE signal connection topology based on said matching. The device comprises a storage module. The storage module comprises an input dataset for storing GOOSE input signals and an output dataset for storing GOOSE output signals and their matching input signals. | 04-26-2012 |
| 20120065804 | SYSTEM AND METHOD FOR REAL-TIME FEEDER RECONFIGURATION FOR LOAD BALANCING IN DISTRIBUTION SYSTEM AUTOMATION - A system and method for real-time feeder reconfiguration are disclosed for load balancing in distribution system automation. The load balancing of transformers and feeders can be achieved by load transfer from an overloaded transformer or feeder to an adjacent transformer or feeder which is lightly loaded. An exemplary method can include defining an objective function as a sum of squares of the load deviation of transformers/feeders. The minimization of this objective function determines the optimal operating states (open or closed) of sectionalizing switches. The load balancing operation of transformer and feeder can be carried out by a single operation in which a plurality of switches is reconfigured. | 03-15-2012 |
| 20110037551 | Oil Filled Transformer With Spacers and Spacers for Separating and Supporting Stacked Windings - An oil filled high power transformer for high voltages with coils. The transformer including a number of stacked layers of, in the main concentric, insulated conductors forming transformer coils. The winding layers are separated by spacers. One or more spacers are provided with at least one integrated electrical discharge barrier extending off the central body of the spacer in the vicinity of the area where the spacer is in contact with a winding. Breakdown along spacer and alongside the spacer-oil interface is reduced getting improved breakdown strength of the oil filled transformer. | 02-17-2011 |
| 20110031220 | VACUUM BASED DIVERTER SWITCH FOR TAP CHANGER - A retrofit diverter switch which has a mechanical and electrical interface that is compatible with the existing designs is provided. The diverter switch may include a vacuum switch. The feature where the mechanical and electrical interface is compatible enables a retrofit from traditional On Load Tap Changers to a vacuum based on Load Tap Changers. The diverter switch may be retrofitted into existing tap changer housings. Retrofitting from traditional to vacuum based, traditional to vacuum based and up rating, and vacuum up rating may be possible. Also, the diverter switch may include modular components that allow for easy customization of the diverter switch for different applications. | 02-10-2011 |
| 20110025515 | STANDALONE SELF-SUPPLIED NUMERIC CONTROLLED RELAY - The disclosure relates to a process of configuring a standalone self-supplied numeric controlled relay for providing phase and earth over current protection to electrical systems by accurate current measurement. The arrangement for current measurement with control algorithms is provided for power control by providing amplified and conditioned current for optimization between the current to power an electronic circuit and the fidelity of a measured current waveform so that they both are at the acceptable levels at the same time. This disclosure describes the current sensing and associated algorithm for power control in a truly self-powered relay. | 02-03-2011 |
| 20110013345 | CONFIGURABLE CIRCUIT BREAKER - A configurable circuit breaker is disclosed which is, for example, applicable for medium voltage range, with flexibility in configuration, based on the electrical and mechanical constraints. The circuit breaker can include multiple poles, which can be fitted on a shaft at desired positions, using clamping, dowelling, bolting or other types of connections. An epoxy frame can mount the circuit breaker on a truck horizontally or vertically, by mounting inserts and the clamping mechanism. Side sheets of the pole allow internal access. Flexible contacts and the vertical slots enable adjustability in the incoming and outgoing distances, as per design constraints. A tulip contact can be provided for mounting incoming/outgoing conductors. A common actuator can be mounted anywhere on the shaft, via the movable contact or on any of the poles, which are robust enough. | 01-20-2011 |
| 20110006105 | POWER CAPACITOR - Equipment for carrying out a method for manufacturing a power capacitor including at least one capacitor element. The equipment includes a solder pot. A solder head includes a first linear module for movements in the x-direction (horizontally) and a second linear module for movements in the y-direction (vertically). A press unit fixes the capacitor elements. The solder pot, the solder head, the first and second linear modules and the press unit are arranged on a steel frame. | 01-13-2011 |
| 20100286834 | Method and Apparatus for Multiple Control Screens - A system for protecting, monitoring, and controlling multiple elements of a high voltage power transmission and distribution system. An intelligent electronic device includes at least one display including a human machine interface configured to display information regarding the multiple elements of the high voltage power transmission and distribution system over a plurality of control screens of the intelligent electronic device and to control the multiple elements of the high voltage power transmission and distribution system. | 11-11-2010 |
| 20100282713 | HEAT DISSIPATING MEANS FOR CIRCUIT-BREAKER AND CIRCUIT-BREAKER WITH SUCH A HEAT DISSIPATING MEANS - The present invention discloses a circuit breaker comprising: a vacuum chamber; a fixed contact and a movable contact disposed in a vacuum chamber; a fixed contact stem supporting said fixed contact in said vacuum chamber and extending outwards from a first end of said vacuum chamber; a movable contact stem supporting said movable contact in said vacuum chamber for reciprocal movement between contact with and separated from said fixed contact, and extending outwards from a second end of said vacuum chamber; a first electrical conductor coupled to said fixed contact stem; a second electrical conductor coupled to said movable contact stem; at least one heat dissipating means disposed for at least one of said fixed contact and movable contact; wherein, the heat dissipating means is hollow and has an external surface and internal surface; a plurality of fins provided on said internal surface constitute a passage through which air is convected in a direction parallel to that of reciprocal movement of movable contact stem. | 11-11-2010 |
| 20100277886 | POWER TRANSFORMER/REACTOR - Power transformer/reactor immersed in oil comprising transformer/reactor core and windings accommodated in a tank ( | 11-04-2010 |
| 20100277329 | MONITORING A FLEXIBLE POWER CABLE - An offshore monitoring system, for an electrical power cable connected between a fixed point and a movable point, or for an electrical power cable connecting two movable points. The system comprises at least one optical fiber acting as a continuously distributed strain measurement sensor attached to or arranged in said power cable, a device arranged for sending optical signals and a device arranged for receiving optical signals to determine the time variant bending of said power cable. | 11-04-2010 |
| 20100277181 | METHOD AND DEVICE FOR FAULT LOCATION IN A TWO-TERMINAL TRANSMISSION OR DISTRIBUTION POWER LINE - A method for locating a fault in a two-terminal power transmission or distribution line. Measurements of the three phase currents are received from both terminals. Measurements of the three phase voltages are received from one line terminal. Parameters of the line are received. The fault type is received. Based on this received information the distance to fault from the one terminal where the phase voltages were measured is determined and output. Since only the phase voltages of one line terminal are needed, the functionality of a device, in particular a current differential relay, can be expanded to determine the distance to fault in an off-line mode. | 11-04-2010 |
| 20100243786 | WINDING APPARATUS AND A METHOD OF WINDING - A winding apparatus for and a method of applying a winding of a band-like material to a limb of a transformer core. The winding apparatus includes a guide member arranged to be fixed in relation to the core limb and a rotary member carrying a supply of a band-like material. | 09-30-2010 |
| 20100232190 | CONVERSION OF AC LINES TO HVDC LINES - An electric power transmission system includes at each end of a high voltage direct current transmission line including three conductors, a converter station for conversion of an alternating voltage into a direct voltage for transmitting direct current between the stations in all three conductors. Each station has a voltage source converter and an extra phase leg connected between the two pole conductors of the direct voltage side of the converter. A third of the conductors is connected to a midpoint between current valves of the extra phase leg. An arrangement is adapted to control the current valves of the extra phase leg to switch for connecting the third conductor either to the first pole conductor or the second pole conductor for utilizing the third conductor for conducting current between the stations. | 09-16-2010 |
| 20100230125 | LAND ELECTRODE - A return path between a first HVDC station and a second HVDC station. A first electrode is connected to the first station and a second electrode is connected to the second station. The return path includes a first part including a first low resistive zone through the crust of the earth in which the first electrode is embedded. A second part includes the earth mantle. A third part includes a second low resistive zone through the crust of the earth in which the second electrode is embedded. | 09-16-2010 |
| 20100225329 | LOAD COMPENSATION IN DISTANCE PROTECTION OF A THREE-PHASE POWER TRANSMISSION LINE - A load compensation method for phase-to-ground loops in distance protection. A first reactive reach is estimated assuming zero fault resistance or with a positive sequence current. A second reactive reach is estimated with a zero sequence current. A third reactive reach is estimated with a negative sequence current. An import or export condition is estimated. A fourth reactive reach for import or export condition is estimated based on the first, second and third reactive reach. A fault impedance is estimated based on the estimated fourth reactive reach. | 09-09-2010 |
| 20100221968 | PREPARING COMPOSITION FOR COMPOSITE LAIMINATES - A composition for production of a prepreg for manufacture of thermoset composite laminates, a method for the production of a prepreg, the prepreg, and a thermoset glass fibre reinforced composite laminate manufactured by curing the prepreg. The composition includes unsaturated polyesters or vinylesters, a catalyst, a thickening agent, and a crosslinking initiator. A first component of the unsaturated polyesters or vinylesters includes reactive groups that react with the thickening agent. A second component of the unsaturated polyesters or vinylesters does not include any groups that react with the thickening agent. The composition also includes a polyether polyol. | 09-02-2010 |
| 20100207599 | ELECTRIC MOTOR DRIVE UNIT FOR ON-LOAD TAP-CHARGERS - A motor drive cabinet in an on-load tap-changer, including an electric motor drive unit and a control unit. The electric motor drive unit includes an electric motor, a gearbox and a position transmitter. The control unit is arranged to control an outgoing axis outgoing from the motor drive cabinet by feeding the electric motor through direct connection to drive the outgoing axis through the gearbox. The position transmitter is arranged to detect movement and position of the outgoing axis and to provide indications thereof to the control unit. The motor drive cabinet is sealed during use with the electric motor drive unit and control unit within the sealing. | 08-19-2010 |
| 20100196720 | POLYCARBONATE RESIN AND OPTICAL FILM USING THE SAME - According to the present invention, a polycarbonate resin having a repeat unit represented by the following formula (1) and a repeat unit represented by the following general formula (2), and an optical film using the same, can be provided. | 08-05-2010 |
| 20100164734 | Multi-Object Protection, Control, and Monitoring in the Same Intelligent Electronic Device - An Intelligent Electronic Device with integrated protection, and/or control, and/or monitoring for two power system primary objects or more power system primary objects, responsive to a plurality of inputs from the power system primary objects, and providing a plurality of outputs to the power system primary objects. | 07-01-2010 |
| 20100133676 | A POWER SEMICONDUCTOR ARRANGEMENT AND A SEMICONDUCTOR VALVE PROVIDED THEREWITH - A power semiconductor arrangement including a clamping device including a first clamping element and a second clamping element. A plurality of power semiconductor elements are stacked on each other between the first and second clamping elements of the clamping device. The first clamping element receives a clamping force in an axial direction of the stack of the power semiconductor elements. At least one spring element is arranged between the first clamping element and the power semiconductor elements. The at least one spring element presents at least one support surface with which the at least one spring element bears against at least one corresponding support surface of an adjacent element. The at least one spring element includes a helical spring. A center axis of the at least one spring element coincides with a center of the clamping force, or the at least one spring element includes a plurality of helical springs arranged in parallel with each other, which are arranged symmetrically in relation to a point in which a center of the clamping force is introduced into the first clamping element. | 06-03-2010 |
| 20100091527 | TAPPING POWER FROM A HVDC TRANSMISSION SYSTEM - An apparatus for tapping electric energy from an HVDC power transmission system includes at least one voltage source converter. The apparatus includes an intermediate ac network containing the voltage source converter, and a switching arrangement for disconnecting the intermediate ac network in dependence on the transmission direction of the HVDC power transmission system. | 04-15-2010 |
| 20100090794 | A RESISTOR FOR ELECTRIC HIGH-VOLTAGE APPARATUS AND A METHOD OF MOUNTING A RESISTOR - A resistor for electric high-voltage apparatus, especially for connection to a diverter switch in an on-load tap changer for a high-voltage transformer. The diverter switch and the resistor are arranged in a housing with transformer oil. The resistor includes a number of resistor elements, wherein each resistor element includes a resistive element, arranged in a frame, which are electrically interconnected by a connection member. The frames are designed to enclose resistive elements that include spring elements formed from spirally wound resistance wire. Connection members include a connection plug. A method of mounting a resistor for electric high-voltage apparatus. | 04-15-2010 |
| 20100053837 | SURGE ARRESTER - A surge arrester for medium and high voltages includes a length adjustment device and pivot unit. | 03-04-2010 |
| 20100046255 | HVDC SYSTEM - An HVDC network including a first station including a first converter, a second station including a second converter, each converter including non-extinguishable semiconducting elements. A first transmission conductor and a second transmission conductor. The first station includes a first switching arrangement. | 02-25-2010 |
| 20100014338 | COOLING AND SHIELDING OF A HIGH VOLTAGE CONVERTER - A converter for converting alternating voltage into direct voltage and vice versa in a converter station of a high voltage transmission system. A series connection of converter valves includes power semiconductor devices connected in series and arranged in superimposed layers. The valves are arranged on top of each other in a column. Coolant liquid conducting tubes are in an extension over at least one part of the circumference of the column having no connections to cooling blocks for cooling the devices made of metal. Such metal tubes are arranged in the part for over this part of the column circumference forming an electric field shielding screen. The coolant liquid conducting tubes are when extending over parts of a circumference of the column where connections are made to cooling blocks made of an electrically insulating material. An electric field shield is arranged outside the column over these parts. | 01-21-2010 |
| 20100014337 | ARRANGEMENT AND A METHOD FOR COOLING - An arrangement for cooling a high voltage converter including a major loop with a pump for making a coolant liquid to pass power semiconductor devices of the converter and a heat exchanger for lowering the temperature of the coolant liquid before passing the power semiconductor devices again. An extra loop is connected to the major loop. The extra loop has a cooling apparatus containing a volume of a cooling medium and adapted to cool the medium to a temperature substantially lower than the temperature of the coolant liquid after having passed the heat exchanger in the major loop. A control unit is adapted to divert at least a part of the coolant liquid to flow through the extra loop when the need of cooling the power semiconductor devices of the converter is extremely high. | 01-21-2010 |
| 20100008111 | Voltage Source Converter Station - The resistors of a filter block in a voltage source converter station are connected with a floating neutral point. | 01-14-2010 |
| 20100007452 | HIGH VOLTAGE TRANSFORMER WITH A SHIELD RING. A SHIELD RING AND A METHOD OF MANUFACTURE SAME - A high voltage transformer including a transformer housing. Internal components and provided in the transformer housing. The internal components are submerged in transformer oil and are provided with insulation for insulating a high voltage winding end. The insulation includes a shield ring arranged above the winding end and a pressboard structure formed in a zigzag pattern arranged around the winding end. The shield ring includes a core covered with a conducting layer and a continuous solid insulation layer outside the conducting layer. The insulation layer includes integrated solid insulation sections of which at least some among themselves having varying thickness. Also a shield ring and a method of manufacture the shield ring. | 01-14-2010 |
| 20100002408 | HVDC FILTER - A filter for an HVDC system. The filter includes a capacitor and a reactor arranged in an indoor location having a first space for erecting filter components. The first space includes a high voltage area and a low voltage area defining a first electric potential direction. | 01-07-2010 |
| 20090323245 | Device for Reduction of Voltage Derivative - A device for reduction of the voltage derivative for an electrical component connected to an electric conductor via an electric bushing. The device protects an electrical component in an electrical apparatus against high voltage derivatives. | 12-31-2009 |
| 20090316446 | TRANSMISSION SYSTEM - A HVDC transmission system including at one end of a bipolar HVDC transmission line a converter station for connecting the transmission line to an AC system. The station has two converters and a DC neutral arrangement in common to the converters. The DC neutral arrangement has a separate electrode line connecting member connecting to electrode lines. The electrode lines are dimensioned to be able to at monopolar operation of the converter station transmit substantially full current to an electrode station through the remaining one or ones of the electrode lines at disconnection of an arbitrary of the electrode lines. | 12-24-2009 |
| 20090303759 | DC filter and voltage source converter station comprising such filter - The resistors of a filter block in a voltage source converter station are connected with a floating neutral point. | 12-10-2009 |
| 20090303758 | CONVERTER - A converter for converting alternating voltage into direct voltage and vice versa in a converter station of a high voltage transmission system including a series connection of a plurality of converter valves. The converter has connections to transformers on both of two opposite sides of the converter valves. | 12-10-2009 |
| 20090301747 | Ground Electrode - A land electrode for a high voltage direct current transmission system including a converter station with a grounding point. The land electrode is connected to the grounding point and includes a plurality of electrode sections. Each electrode section includes at least one electrode element. | 12-10-2009 |
| 20090284876 | Electric Power Converter - A voltage source converter including a string of series connected active semiconducting elements. The converter includes in case of an active semiconducting element failure a calculation element configured to calculate an operation dc voltage including a sum of dc ratings of each remaining active semiconducting element in the string, and a regulator configured to regulate the converter to assume the operation dc voltage over the converter. | 11-19-2009 |
| 20090272561 | PROTECTIVE CASING FOR A HIGH VOLTAGE CABLE - A protective casing for a joint, termination or cross-connection of at least one high voltage cable. The protective casing includes a first material portion of a first metal material having good strength properties. The protective casing includes a second material portion of a second metal material which is fixedly attached to the first material portion. The second metal material has good soft soldering properties such that it is possible to provide a strong and tight connection between the second material portion of the protective casing and a sheath of at least one of the cable parts by a soft soldering process. | 11-05-2009 |
| 20090219737 | TRANSMISSION SYSTEM AND A METHOD FOR CONTROL THEREOF - An HVDC transmission system including a rectifier station and an inverter station each having a series connection of at least two converters. A by-pass DC breaker is connected in parallel with each converter. A control device is adapted to deblock a blocked converter by starting to control the converter at high delay angle and gradually decreasing the delay angle until substantially all DC current flows through the converter and to then control the by-pass breaker to open at substantially zero current, and to stop the operation of a converter by controlling the converter at gradually increasing delay angle until the voltage across the converter is substantially zero and to then control the converter to be blocked by firing a by-pass pair thereof and to then control the by-pass breaker to close for taking over all the DC current when the voltage between a neutral bus and a pole of a transmission line between the stations is to be increased and reduced, respectively. | 09-03-2009 |
| 20090218208 | DISCONNECTOR AND A SUPPORT INSULATOR THEREFOR - A disconnector for interrupting a current path on a voltage of at least 100 kV with respect to earth. Two groups of elongated post-like support insulators are adapted to rest on the ground and support an end of a conductor each on a high level above the ground. A disconnector arm is connected to one or both of the conductor ends and is moveable for connecting and disconnecting these conductor ends. At least the external parts of the support insulators are made of a hydrophobic rubber composite insulating material. | 09-03-2009 |
| 20090201702 | Converter Station - A converter station for connecting an AC system to a bipolar HVDC transmission line. A DC neutral arrangement includes first DC breakers enabling breaking of a first current path from the neutral bus of one pole to the neutral bus of the other pole at bipolar operation of the station for changing to monopolar operation thereof for isolation of a faulty section of the system while establishing a current path to electrode line connecting members for diverting the current from the one pole thereto. A separate connecting member is provided for each of the electrode lines. A connector is configured to connect each neutral bus to an optional of the two electrode line connecting members. | 08-13-2009 |
| 20090200872 | CONTROLLED SERIES COMPENSATOR AND METHOD - A control apparatus for a controlled series compensator including a plurality of reactance elements each having a rapid switch for connecting and disconnecting the reactance in series with an electric power transmission line. The apparatus also includes a steady state power flow controller. A damping controller is provides on the presence of an oscillation on the transmission line a first reactance insertion on the transmission line having a first duration of time trigged by a time instant that coincides with a peak in the power oscillation. | 08-13-2009 |
| 20090173515 | ELONGATED MEMBER AND USE THEREOF - An elongated member including an outer sleeve-like rigid insulator shell surrounding a high voltage conductor extending in the longitudinal direction of the shell and a gap inside the shell next to an internal wall of the shell at least partially surrounding the conductor and filled with a medium including a material of with electrically insulating properties. The medium is formed by an electrically insulating material including hollow spaces at least partially filled with gas. The material is adapted to expand upon a temperature rise thereof by reversibly compressing the hollow spaces and reducing the volume thereof. | 07-09-2009 |
| 20090172455 | Using Travel-Time as Means for Improving the Accuracy of Simple Network Time Protocol - A method for improving accuracy of simple network time protocol. A time inquiry is sent from at least one device in a substation to a time provider. A message including a reference time is received from the time provider. An accuracy of the reference time is evaluated. If the accuracy of the reference time is less than a threshold value the accuracy of the reference time is improved. The reference time is utilized for synchronization. | 07-02-2009 |
| 20090168473 | CONVERTER STATION - A converter station for connecting an AC system to an HVDC transmission line. At least two converters are arranged in two separate converter valve halls. The station includes a separate control device configured to control of each converter and an auxiliary power source configured to provide auxiliary power for each converter. A separate overall control configured to control the overall operation conditions is arranged for each converter making each converter self supporting. The converter valve halls are separated by a substantial space. | 07-02-2009 |
| 20090168468 | Converter Station - A converter station for connecting an AC system to a bipolar HVDC transmission line. A DC neutral arrangement is provided with first DC breakers enabling breaking of a first current path from a neutral bus of one pole of the transmission line to a neutral bus of another pole at bipolar operation of the station for isolation of a faulty section and changing to monopolar operation/metallic return thereof. The DC neutral arrangement has in the first current path at least two first DC breakers connected in series and adapted to act as a backup for each other would the other thereof fail to break the first current path upon a control to isolate a faulty section by changing from bipolar to monopolar operation. | 07-02-2009 |
| 20090167090 | ENERGY SUPPLY SYSTEM AND METHOD RELATED THERETO - An energy supply system adapted for supplying energy to equipment on a high voltage platform. The system includes a fuel cell and an effectuating capacitor. The system also includes an intermediate storage and supply unit. This unit stores energy from the fuel cell and supplies energy to the effectuating capacitor via an electric transforming unit. A high voltage platform including the energy supply system. An electrical network including the platform. A method for supplying energy to equipment on a high voltage platform. | 07-02-2009 |
| 20090165579 | METHOD AND A DEVICE FOR TRANSMITTING ROTARY MOTION - A device for transmitting rotary motion. The device includes a motion-transmitting member for transforming an alternating rotary motion of a input drive shaft into a unidirected rotary motion of a driven body driven about a drive shaft. The motion-transmitting member includes an intermediate body rotatable about an axis of rotation. A mechanical energy accumulation member is mechanically connected to the driven body. The intermediate body includes a cam disk in the form of a driving pulley and the mechanical energy accumulation member includes a tensile/compressive spring unit. | 07-02-2009 |
| 20090126965 | COOLING OF HIGH VOLTAGE DEVICES - A high voltage bushing including an electrical conductor configured to be electrically connected to a high voltage device and configured to be connected to an external fluid cooling system, and an insulating body surrounding the electrical conductor. A method includes cooling the high voltage bushing by connecting the electrical conductor to an external fluid cooling system. | 05-21-2009 |
| 20090108973 | HIGH VOLTAGE INSULATION SYSTEM AND A METHOD OF MANUFACTURING SAME - A high voltage insulation system for high-voltage direct current including a bushing, a conductor, a transformer conductor, and a connection between the conductor and the transformer conductor. A conductive shielding electrode shields the connection between the bushing and transformer. A surrounding insulation system is immersed in transformer oil. The surrounding insulation system includes transformer insulation material and bushing insulation material. A cylindrical solid insulation barrier encloses the connection between the bushing conductor and transformer conductor. At least one solid insulation barrier is fastened on the outer side of the shielding electrode. The at least one solid insulation barrier extends in an axial direction outside the axial direction of the shielding electrode and forms a distance to the insulation material of the bushing and the insulation material of the transformer, whereby a moderate voltage drop over the solid insulation barrier is obtained. | 04-30-2009 |
| 20090059447 | METHOD AND DEVICE FOR FAULT DETECTION IN AN N-WINDING THREE-PHASE POWER TRANSFORMER - A method and a device for fault detection in an n-winding, three-phase power transformer. For each of the windings (Wi) the three phase currents (I | 03-05-2009 |
| 20090021878 | METHOD AND ADAPTIVE DISTANCE PROTECTION RELAY FOR POWER TRANSMISSION LINES - A method and an adaptive distance protection relay for compensating for a remote line end infeed effect during determination of a distance to a resistive fault on a three-phase power transmission line. It is assumed that a fault current flows through the fault resistance. A fault loop impedance is first calculated by a known algorithm from phase voltages and phase currents. A shift of the fault loop impedance is determined from the fault loop impedance, the impedance of the transmission line for the positive current sequence and the phase angle of a complex fault current distribution factor, where the fault current distribution factor is the ratio of the fault loop current to the fault current. The distance to fault is calculated by subtracting the impedance shift from the fault loop impedance and dividing the result by the impedance of the transmission line for the positive current sequence. | 01-22-2009 |
| 20090001227 | Cable System - A method for mounting a cable duct on a supporting surface. The cable duct includes openings for applying attachment elements, forming parts of the supporting surface into at least three hitches. The hitches are placed corresponding to the openings in the cable duct and the cable duct is mounted on the surface through the hitches. | 01-01-2009 |
| 20090000806 | High Voltage Bushing and High Voltage Device Comprising Such Bushing - A high voltage bushing for a high voltage device containing insulating liquid includes a voltage grading shield, improving performance and facilitating manufacturing. | 01-01-2009 |
| 20080296150 | Device and a Method for Metal Plating - A device and a method for metallic electrolytic coating of an object of electrically conductive material, wherein the object has at least two surface portions that are desired to be coated with layers of different thicknesses. The device includes an anode. The device is designed to receive the object in such a way that the object constitutes a cathode and that, upon receipt of the object, a space is formed for receiving a liquid-absorbing material and an electrolyte for coating the object. The body of the anode includes at least two surface portions) that have different electrical conductivity and that are arranged opposite to the surface portions of the received object. | 12-04-2008 |
| 20080296045 | Method For Manufacturing a Post Insulator and a Post Insulator - A method for manufacturing a post insulator. A core is introduced into a tube of an insulating stiff material while leaving a small circumferential space separating the core and inner walls of the tube. Adhesive is introduced under an overpressure into an interior of the tube and is cured while maintaining an overpressure in the interior of the tube. | 12-04-2008 |
| 20080276442 | Device For Stretching an Elastically Expandable Body - A device for stretching an elastically expandable body, wherein the device includes a stiff tube over which at least part of the elastically expandable body is arranged to be applied when being stretched. The device includes at least one sliding element designed to be located in at least that end of the body where the application of the tube starts, to facilitate the application of the body onto the tube. | 11-13-2008 |
| 20080251424 | Method for Removal of Reactive Sulfur from Insulating Oil - A method for removing sulfur from insulating oil. The oil is exposed to at least one sulfur scavenging material and at least one polar sorbent. | 10-16-2008 |
