ABB Power Grids Switzerland Patente

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A tulip contact for a power switch, comprises a rotationally symmetric contact body 100 having a first end 120, a second end, and a plurality of slits 210, 220. The slits are arranged in the body and extend parallel to the symmetrical axis 140 of the body. The slits define a length between the first end and a root of the slits.The slits have a first width at the first end and a second width at the root of the slits, wherein the first width is bigger than the second width. A stress-relief element 400 is provided to mitigate mechanical stress in the material of the body 100 in case the slits 210, 220 close.

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The present disclosure relates to a sensor arrangement (1) comprising a sensor (2) configured to be arranged in an electrical device environment and to measure a property of said environment, a detector (3) configured to receive signals from the sensor, and a resonator array (4) comprising an array of LC circuits (5) arranged between the sensor and the detector and configured to wirelessly transfer power to the sensor from an electrical power source and to wirelessly transfer the sensor signals from the sensor to the detector.

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A transformer comprises a tank (20) having tank walls (21, 22, 25). The tank walls (21, 22, 25) comprise composite panels (40) having a core (41). The tank (20) has a fluid-tight insert (30).

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An electric arrangement (10) comprising a casing (14); a heat generating electric component (18) arranged inside the casing (14); and a heat exchanger (12) comprising a three dimensional lattice cell structure (22), the three dimensional lattice cell structure (22) being arranged to conduct a dielectric cooling fluid (16) from the casing (14) at an exterior side of the casing (14) for heat exchange with an ambient fluid (20), and back towards the casing (14) for cooling of the electric component (18). A panel (60) for a heat exchanger (12) and a heat exchanger (12) comprising a plurality of panels (60) are also provided.

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A method of controlling a microgrid (10) comprises retrieving, by an energy management system, EMS (50), a forecast variable value for a forecast variable. The EMS (50) determines an operating point value for a controllable asset (11-14) that depends on the retrieved forecast variable value. The EMS (50) determines an operating point shift value for the controllable asset (11-14), the operating point shift value representing a shift in operating point value in response to a variation in forecast variable value. The operating point value and the operating point shift value are provided to a power management system, PMS (40), of the microgrid (10).

The present invention relates to an on-load tap changer including a tap changer tank (3) filled with a dielectric fluid and an insulation barrier comprising an insulating sheet (12) made of an electrically insulating material. The insulation barrier comprises a frame (14) at least partly surrounding the insulating sheet, and a plurality of spring-loaded fastening members (35) for fastening the frame (14) to the tap changer tank (3). The fastening members (35) are pivotably arranged relative the frame and the tap changer tank to allow relative movements between the frame and the tap changer tank.

A gas-insulated high or medium voltage circuit breaker (100) comprises a pin contact (120) and a second contact (130) being configured to be moveable with respect to each other along a longitudinal axis (190) of the circuit breaker (100) between an open and a closed configuration of the circuit breaker, the pin contact (120) and the second contact (130) defining an arcing region (180) in which an electrical discharge (160) is formed during a current breaking operation; and an auxiliary nozzle (150) comprising an electrically insulating material that at least partially surrounds the second contact (130), a main nozzle (110) comprising an electrically insulating material that encloses the auxiliary nozzle at least partially, and a heating channel (140) provided between the auxiliary nozzle and the main nozzle, wherein the heating channel separates the auxiliary nozzle from the main nozzle axially and radially and enables a fluid communication between the arcing zone (180) and an upstream pressure volume (155), wherein at least one conductive element (360) is embedded within the insulating material of the main nozzle (110) and is electrically floating, wherein the at least one conductive element (360) is arranged around the arcing region (180) and is configured to generate an electrical field due to the presence of an electrical discharge (160) in the arcing region (180), the electrical field being configured for deflecting the electrical discharge (160) which propagates from the pin contact (120) along an inner surface (175) of the main nozzle (110) towards the second contact (130).

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There is provided a pressboard for high-voltage devices, the pressboard having a density of 0.6-1.3 g/cm3 according to IEC60641-2, and comprising 1-15 % microfibrillated cellulose, MFC, based on the total dry weight of the pressboard. There is also provided an insulation element (101) comprising such pressboard, wherein the pressboard is impregnated with an electrically insulating compound (104). There is also provided use of such insulation element in a high-voltage device (100) as well as a high-voltage device comprising such insulation element, wherein the high-voltage device may be a power transformer.

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A circuit breaking apparatus (100) comprises a circuit breaker (110), a motor drive system (120), and a controller (150). The circuit breaker (110) is electrically connectable to a power line (115). The motor drive system (120) is mechanically coupled to the circuit breaker (110) and configured to operate the circuit breaker (110) such as to perform a movement including at least an opening movement from a closed position to an open position, thereby electrically interrupting the power line (115). The controller (150) includes a model (155) of at least one of the motor drive system (120) and the circuit breaker (110).The controller (150) is configured to receive reference travel curve information (200) of the movement; generate actuator information (210) from the reference travel curve information (200) based on the model (155); and output the actuator information (210) to the motor drive system (120) to control a travel curve via model-based control.

Examples of operating an Intelligent Electronic Device (IED) during power swings, are described. In an example, voltage measurements for a phase is received and sampled. Root mean square (RMS) values of the voltage samples is calculated based on the voltage measurements. Delta quantities for each phase are calculated based on the RMS values. Each of the RMS values and delta quantities are associated with respective sampling instants. In response to a delta quantity being greater than a predefined threshold, a peak delta quantity is detected. A time interval between a sampling instant associated with the peak delta quantity and a sampling instant associated with a first delta quantity is determined. Based on a comparison of the time interval with a threshold time, a disturbance condition may be detected as a power swing and consequently, fault detection at the IED may be blocked.

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Die Anmeldung betrifft eine Betriebsmitteltraganordnung für ein elektrisches Betriebsmittel (2), insbesondere einen Transformator oder Leistungstransformator, umfassend mehrere am Betriebsmittel selbst angeordnete Haltemittel (3a,b,c,d), sowie eine Stützanordnung mit mehreren Lastaufnehmern (4a,b,c,d), , insbesondere vier säulenartig ausgebildete Stützfüße, wobei das jeweilige elektrische Betriebsmittel (2) in Endlage mit den Haltemitteln (3a,b,c,d) auf den Lastaufnehmern (4a,b,c,d) abgesetzt ist und/oder nach dem Absetzen zumindest teilbereichsweise zwischen den Lastaufnehmern (4a,b,c,d) ruht und angeordnet ist. Weiterhin umfasst ist ein Verfahren zum Aufstellen eines elektrischen Betriebsmittels (2) mittels einer vorgenannten Betriebsmitteltraganordnung. Auch die Verwendung von Lastaufnehmern (4a,b,c,d), insbesondere Absetzdosen für das Aufstellen eines Transformators oder Leistungstransformators ist Gegenstand der Anmeldung.

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A controller (101,102) for a High Voltage Direct Current (HVDC) system, the HVDC system comprising two stations (S1, S2) between which power is conducted via a pair of conductors (110; 120) connected between converters (111, 121, 112, 122) acting as rectifiers (111, 121) and inverters (112, 122) and a Dedicated Metallic Return conductor (DMR) or an Electrode Line (EL) (130) installed between the neutral points of the stations (S1, S2), wherein the controller (101,102) comprises a converter firing controller (11) controlled by a control subsystem (12) and configured to output valve firing pulses according to a converter firing control sequence to the converters (111,112, 121,122) to generate a balanced current flow in the conductors (110; 120), characterized in that: the control subsystem (12) is configured to alter the converter firing control sequence generated by the firing controller (11) such as to introduce unbalance of current flow in the DMR or EL (130); and the controller (101, 102) further comprises a fault locator (10) configured to locate faults by measuring the current (103) flowing in the DMR or EL (130).

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