Abstract:
PROBLEM TO BE SOLVED: To provide a medium or high voltage switch having high voltage withstand capability and fast switching times.SOLUTION: The switch has a first set of contact elements 13a, 13b, 13c and a second set of contact elements 14a, 14b, 14c. Each contact element includes an insulating carrier 15 carrying conducting elements 16. In the closed current-carrying state of the switch, the conducting elements 16 align to form one or more current paths 34 between terminals 8 and 9 of the switch along an axial direction A. For opening the switch, the contact elements 13a, 13b, 13c; 14a, 14b, 14c are mutually displaced by means of two drives along a direction D perpendicular to the axial direction A. The switch is arranged in a fluid-tight housing in a gas of elevated pressure or in a liquid.
Abstract:
PROBLEM TO BE SOLVED: To provide a method and a system to control a voltage source converter in an HVDC link which allow a more stable energization of a dead AC network. SOLUTION: The method for controlling voltage source converters CON1 and CON2 includes a step of controlling an AC voltage UV1 generated by the voltage source converters CON1, CON2 and the frequency and voltage amplitude of UV2 independently of the states of AC networks N1, N2 connected to the voltage source converters CON1, CON2. This method is performed with a controller of the HVDC system. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a semiconductor device such as a RC-IGBT or a BIGT without using masking technique. SOLUTION: The semiconductor device, such as the RC-IGBT or BIGT, has both partial regions 15 doped with dopants of a first conductivity type and regions 13 doped with dopants of a second conductivity type on the same side of a semiconductor substrate 7. The method includes (a) implanting dopants of the first conductivity type and implanting dopants of the second conductivity type into the surface 3 to be patterned. The method includes (b) locally activating dopants of the first conductivity type by locally heating the partial region 15 of the surface to be patterned using a laser beam similar to those used in laser annealing. Further, the method includes (c) activating the dopants of the second conductivity type by heating the substrate 7 to a second temperature lower than a first temperature. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a circuit breaker that not only has an increased current transfer ability but also improves a contact formed by a rated current contactor when a switch is closed and opened. SOLUTION: Two contact mechanisms capable of being moved along an axis A, in the lengthwise direction of the switch form an arc contactor system 12 and a rated current contactor system 9 connected electrically in parallel thereto; here, one of the contact mechanisms has the rated current contactor system 9, an inner rated current contactor 6 and an outer rated current contactor 7; and the inner rated current contactor 6 extends over the outer rated current contactor 7 in the lengthwise direction axis A and the outer rated current contactor 7 surrounds the inner rated current contactor 6 in a coaxial form. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a high field strength varistor material having a low power loss level, and further having another electric characteristic, that is, excellent performance related to, in particular, a nonlinear current-voltage curve (or each current density-field strength curve), impulse behavior, and stability of useful life. SOLUTION: This varistor material for a surge arrester contains ZnO forming a ZnO phase and Bi expressed as Bi 2 O 3 forming an intergranular bismuth oxide phase. The varistor material further includes a spinel phase, wherein the amount of a pyrochlore phase included in the varistor material is such that the ratio of the pyrochlore phase to the spinel phase is less than 0.15. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a small sealed high-voltage switch having a transmission capability with a large rated current. SOLUTION: The sealed high-voltage switch has a conductor generating heat, a metal airtight container surrounding the conductor, and a cooling element. A cooler K as a cooling element is fixed on a part of the airtight container constituted as a mounting plate 22, and has a cooling lib 41 arranged outside the airtight container. At least a part of the cooling lib 41 is arranged in parallel to the mounting plate 22 and is held on a heat distributor 42 fixed to the mounting plate 22 so that one of two groups of cooling channels 43 appears on each of both sides of the heat distributor 42. The cooling channels 43 are respectively arranged in a sandwich manner and inclined in a horizontal direction. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a stable spring arrangement which does not cause buckling or rocking, with no guiding means. SOLUTION: A spring arrangement 1 for a spring drive unit 2 includes springs 3 and 4 and pullrods 5 and 6. The pullrod is connected to a first spring end 8 of the spring by a first pullrod end 11, and is connected to a rotating shaft of the spring drive unit by a second pullrod end on the opposite side. The spring arrangement includes a frame plate 7 to which a second spring end 9 of the spring is fitted. The frame plate is provided with an opening through which the pullrod extends and is connected to the shaft. The parameter of the spring is selected according to operation condition of the spring drive unit so that the spring becomes stable during operation. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a closing resistor arrangement or a high voltage circuit breaker to enable two or more times of switching even in a comparatively high voltage power supply system. SOLUTION: This closing resistor 18 for the high voltage circuit breaker has a large number of resistor elements 70 and a large number of cooling elements 60. The cooling elements 60 are arranged in series with one another, and are electrically connected in series with one another. The resistor elements 70, which electrically connect the electrical cooling elements with one another, are each connected between two cooling elements 60 arranged in series. COPYRIGHT: (C)2009,JPO&INPIT