Hitachi Energy Patente

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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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The present invention relates to a method for re-establishing an electrical apparatus of medium or high voltage. The method comprises the steps of a) providing an electrical apparatus designed for using an insulation medium containing SF<6>, b) removing SF<6> from an insulation space contained in the apparatus and c) filling an alternative insulation medium into the insulation space, wherein the alternative insulation medium is a mixture of at least one organofluorine compound A and a carrier gas containing nitrogen.

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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 half-bridge power module (10) comprises comprising one or more substrates (13, 31, 32) with one or more metallizations (14, 33, 34), at least one high side switching device (11) and at least one low side switching device (12) located on the one or more substrates (13, 31, 32), each of the switching devices (11, 12) comprising a source or emitter contact (3, 3a, 3b) on a first side (4) and a drain or collector contact (5, 5a, 5b) on an opposite second side (6), wherein the source or emitter contact (3, 3a, 3b) of one of the switching devices (11, 12) is oriented towards and electrically connected to one of the metallizations (14, 33, 34) and the drain or collector contact (5, 5a, 5b) of the other one of the switching devices (11, 12) is oriented towards and electrically connected to one of the metallizations (14, 33, 34).

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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.

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.