Hitachi Energy Patente

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A dielectric heating method for moisture extraction from an active part (10) of a transformer (1) is provided. The method comprises a step of configuring a system including at least one an apparatus (2) configured to generate electric fields alternating at radio frequencies, wherein the electric fields penetrate at least part of regions between freely selectable electrodes (3). The method further comprises a step of operating the at least one apparatus (2) for drying at least one moist region (7) of the active part (10) of the transformer (1), wherein the at least one moist region (7) is located at least partially between the freely selectable electrodes (3), so that the at least one moist region (7) is exposed to the generated alternating electric fields, resulting in heat generation within the at least one moist region (7).

A transformer core, comprising a first yoke, a second yoke, a column (6) having a column main axis (8) and extending between the first yoke and the second yoke, and an elongate clamping structure (10) comprising an elongate rigid member (12) having a rigid member main axis (14) is provided. The column (6) includes an elongate opening (16) having an opening main axis (18) which is oriented transversal with respect to the column main axis (8). The rigid member (12) is positioned within the elongate opening (16) such that the rigid member main axis (14) is oriented parallel to the opening main axis (18).

A transformer comprises: - a core (101), - a winding (102, 103) wound around a winding axis (105) extending along the core (101), - an eddy losses reducer (200), the eddy losses reducer (100) being arranged at an axial end (106) of the winding (102, 103) and comprising a non-ferromagnetic main body (201) and a ferro-magnetic layer (202) surrounding the main body (201).

The semiconductor device (100) comprises a semiconductor body (10) with a top side (11) and a bottom side (19). A first main electrode (2) is arranged on the top side and a second main electrode (3) is arranged on the bottom side. The semiconductor device comprises a gate electrode (3) and at least two trenches, namely a first-type trench (51) and a second-type trench (52). The semiconductor body comprises a drift region (14) arranged vertically between the top side and the bottom side and at least two base regions (13a, 13b) each arranged vertically between the drift region and the top side. The semiconductor body further comprises an injection region (12) adjoining the first base region. The first main electrode is in electrical contact with the injection region. The gate electrode extends into the first-type trench. The second-type trench is free of the gate electrode. The second-type trench extends deeper into the semiconductor body than the first-type trench.

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The invention relates to a method for producing an insulator for gas insulated switchgear (20) by injection molding a thermoplastic resin (4). The method comprises a filling step (100) of filling a cavity (3) of a mold (1, 2) with molten thermoplastic resin (4) and a packing step (200) of packing the thermoplastic resin (4) in the mold (1, 2) under controlled pressure. The molten thermoplastic resin (4) is introduced into the cavity (3) via at least a first inlet opening group and a second inlet opening group and the packing step (200) includes a first packing sub-process step (200a) and a second packing sub-process step (200b) of controlling the pressure of the first inlet opening group and the second inlet opening group.

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When supporting ancillary services for a target power system, existing solutions consider a fixed capacity of the battery energy storage system. In contrast, disclosed embodiments leverage a forecast of ancillary events, in combination with an optimization model, to produce an optimal determination for ancillary services. In particular, required capacity may be calculated from the forecast of ancillary events, and a capacity constraint may be generated from the required capacity and incorporated into the optimization model. Then, the optimization model may be solved to produce an optimal determination for ancillary services.

A coil block fixation system (30) for a transformer comprises a coil block body to be coupled to a coil (19) of the transformer, and a supporting plate that is coupled to an upper surface (23) of the coil block body (10) opposite a bottom surface (24) of the coil block body (10). The coil block fixation system (30) further comprises two or more rods (3) that are coupled to an upper surface (21) of the supporting plate (1) opposite a bottom surface (22) of the supporting plate (1) for setting a load to the supporting plate (1) towards the coil block body (10). The supporting plate (1) and the coil block body (10) are formed geometrically in coordination with each other such that one comprise at least one recess (13, 14) and the other one comprise at least one protrusion (9, 16) that extends into the corresponding recess (13, 14) forming a respective movement limiter to counteract a translation and/or a rotation of the supporting plate (1) relative to the coil block body (10).

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A coil block fixation system (30) for a transformer comprises a coil block body to be coupled to a coil (19) of the transformer, and a supporting plate that is coupled to an upper surface (23) of the coil block body (10) opposite a bottom surface (24) of the coil block body (10). The coil block fixation system (30) further comprises two or more rods (3) that are coupled to an upper surface (21) of the supporting plate (1) opposite a bottom surface (22) of the supporting plate (1) for setting a load to the supporting plate (1) towards the coil block body (10). The coil block fixation system (30) further comprises two or more spring elements (2) one of which is coupled to the associated rod (3) such that the load set to the supporting plate (1) is provided with a given flexibility with respect to a mounting direction from the coil block body (10) to the rods (3).

There is disclosed herein a protection device (100) adapted to protect a series compensation unit (SCU, 102) for a power line (2), wherein the protection device (100) comprises a mechanical switch (104), configured to close to thereby bypass the SCU (102), and a triggered spark gap (TSG, 106) connected across the mechanical switch 104, configured to trigger in response to a trigger signal. The actuator of the mechanical switch (104) is powered by an energization circuit (108) electrically connected in series between the SCU (102) and the TSG (106), or by at least one energy storage (118) in the series compensation unit (102). There is further disclosed herein a series compensation system (1) comprising such a protection device (100) arranged across a series compensation unit (102).

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A wall bushing for high voltage application is presented. The wall bushing comprises a grounded shield (2). The grounded shield comprises a grading ring (6) in a distal end thereof. The grading ring has an elliptic cross section (7) with conjugate diameters, wherein a major diameter of the conjugate diameters is arranged in an axial direction of the grounded shield and a minor diameter of the conjugate diameters is arranged in a radial direction of the grounded shield. The major diameter is larger than the minor diameter.

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