摘要:
A ferromagnetic core (10) includes a ferromagnetic center portion (14) including a plurality of legs (16) each receptive of a conductive winding. The plurality of legs extend from a common center point (18) and are equally angularly spaced. A ferromagnetic outer ring (12) is positioned around the center portion at an outer radial extent of the plurality of legs. The core may be used in a transformer with a conductive winding (26) located at each leg.
摘要:
A tap-switching autotransformer for regulating the voltage supplied to a facility includes an electronics sub-assembly for controlling switching of the taps. The electronics sub-assembly and the windings are contained in a housing from which the electronics sub-assembly may be removed for repair or replacement. The electronics sub-assembly is adapted to enable an electronically actuated switch to short-circuit two of the taps. A mechanical switch enables a separate short-circuit to be maintained between the taps to enable the electronics sub-assembly to be safely removed from the housing.
摘要:
Three coils, each having several serial windings (A1-A4 or 5; B1-B4 or 5; C1-C4 or 5), have selected windings connected in a delta (A2-A4 or 5; B2-B4 or 5; C2-CR or 5). Input AC power is applied through outrigger windings (A1, B1, C1)at the delta apices (A, B, C). At least two strategically located, direct tap, natural output points (01-06; or 01, 02, 04, 05, 07, 08) are provided at each side of the delta. For 6-phase output, only the six natural output points (01-06) are required. For 9-phase output, an additional central output terminal (09, 06, 03) connects to each side of the delta through a stub winding (A6, B6, C6). The 6-phase or 9-phase output is passed to a rectifier circuit (R).
摘要:
The present invention relates to a power conversion device and a power conversion system, and an object of the present invention is, particularly in three-phase/two-phase conversion, to suppress cost increase and conversion efficiency reduction by reducing the number of switching elements, and also to prevent generation of harmonics in a power supply. In order to achieve the object above, a power conversion device (1) includes input terminals (121 to 123), first output terminals (131, 132), second output terminals (141, 142), and an insulation transformer (11). The insulation transformer includes a primary coil (L1) and a secondary coil (L2) of equal inductance. The polarity of one end of the primary coil is equal to the polarity of the other end of the secondary coil. One of the first output terminals is connected to an input terminal and the one end of the primary coil. The other of the first output terminals is connected to an input terminal and one end of the secondary coil. One of the second output terminals is connected to the other end of the primary coil and the other end of the secondary coil. The other of the second output terminals is connected to an input terminal.
摘要:
The invention concerns the electric power supply of airplanes and in particular large-size commercial airplanes. The invention is characterized in that the aircraft is equipped with an AC/DC converter which distributes power over a direct current network from a 230 volt three-phase alternating voltage applied to the main inputs (E1, E2, E3). The converter comprises an autotransformer which preferably has nine outputs (A1, A2, A3, B1, B2, etc.) for nine-phase rectifying. Said outputs are applied to an 18-diode rectifier bridge. When the aircraft is on the ground, the alternating power is supplied at 115 volts from a ground generator; it is applied through a three-phase connector (CAUX) to the auxiliary inputs (M1, M2, M3) connected to intermediate outlets of three-phase coils constituting the AC/DC converter.
摘要:
The invention refers to a power transformer/reactor having a high voltage winding (2, 3) wound around a core (1). The transformer/reactor is a so-called dry type of transformer, i.e. air-cooled. According to the invention the high voltage winding is divided into a first section (2) and a second section (3) in series to each other. The winding is electrically connected (4, 5) to the core (1) between both these sections.
摘要:
The present improvement essentially integrates a DC link inductance within an interphase power transformer (IPT). The integration is achieved by creating auxiliary magnetic paths for leakage inductance inside the IPT core 50. The magnetic path can be created, for example, by incorporating extra portions of magnetic material commonly referred to hereinafter as shunts 100. The IPT flux shared between windings 60 does not cross these shunts. Therefore, this magnetic path increases the self-inductance of the IPT but does not contribute to the mutual inductance between windings. This extra magnetic path allows for leakage inductance of a much higher quantity than that achievable with a conventional IPT.