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1. 发明专利

JPH1092660A TRANSFORMER FOR CONVERSION 失效
公开(公告)号：JPH1092660A
公开(公告)日：1998-04-10
申请号：JP24630596
申请日：1996-09-18
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO , SHIKOKU ELEC POWER , ELECTRIC POWER DEV CO
发明人： FURUKAWA SADAO , KOJIMA KEIMEI , MIYAO HIROSHI , KADOWAKI SHIN , OBATA TOSHIMITSU , TANAKA MAKOTO , SUGIHARA HIROSHI , MAKINO YOSHINORI
IPC分类号： H01F27/32 , H01F27/36
摘要： PROBLEM TO BE SOLVED: To provide a transformer for conversion which can reduce an insulation distance. SOLUTION: An insulator 13 is provided inside a first insulation tube 4 arranged between a core leg 1a and a DC winding 2. An insulator 130 is provided inside a second insulation tube 40 arranged between the DC winding 2 and an AC winding 3. The insulators 13, 130 are formed of a material whose conductivity is small and volume resistivity is large when compared with an insulation film 8 forming an electric wire 9 of the windings 2, 3 and an insulation film 11 of a shield ring and insulation tubes 4a, 4b. Thereby, while a DC field which acts on the insulators 13, 130 increases, a voltage shared by each of the insulation tubes 4a, 4b and the insulation films 8, 11 of small volume resistivity becomes small.

2. 发明专利

JPH10321442A DIRECT CURRENT TRANSMITTING TRANSFORMER 失效
公开(公告)号：JPH10321442A
公开(公告)日：1998-12-04
申请号：JP12968897
申请日：1997-05-20
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO , SHIKOKU ELEC POWER , ELECTRIC POWER DEV CO
发明人： KADOWAKI SHIN , OBATA TOSHIMITSU , KOJIMA KEIMEI , SEKINE KAZUO , TANAKA MAKOTO , SUGIHARA HIROSHI , HATANO MASAYUKI
IPC分类号： H01F27/32 , H01F27/36
摘要： PROBLEM TO BE SOLVED: To provide a direct current transmitting transformer in which insulating strength of an insulation structure material is improved by decreasing an electric field value of direct-current voltage applied in edgewise of the insulation structure material comprising an oil impregnated paper in a boundary part between an insulation spacer and an electric field relaxing grading ring. SOLUTION: In a wedge gap formed between the bottom surface of an insulation spacer 15 comprising an insulation paper whose edgewise is in a diameter direction and an upper corner part of an electric field relaxing grading ring 10 whose coating insulation material 10d comprises an insulation paper, a direct- current voltage sharing insulating ring 18 comprising an oil impregnated paper which has a cross-sectional form corresponding to the gap is buried, so that direct-current voltage applied to a boundary part between the spacer 15 and the grading ring 10 is shared in a flatwise A of the insulating ring 18.

3. 发明专利

JPH09260150A INDUCTION ELECTRIC MACHINE FOR DC TRANSMISSION 失效
公开(公告)号：JPH09260150A
公开(公告)日：1997-10-03
申请号：JP6816196
申请日：1996-03-25
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO , SHIKOKU ELEC POWER , ELECTRIC POWER DEV CO
发明人： KADOWAKI SHIN , OBATA TOSHIMITSU , FUJITA HIROYUKI , KOJIMA KEIMEI , SEKINE KAZUO , TANAKA MAKOTO , SUGIHARA HIROSHI , HATANO MASAYUKI
IPC分类号： H01F27/10
摘要： PROBLEM TO BE SOLVED: To suppress a DC high electric field which is produced, for instance, on the combination part of various insulators made from insulating paper in insulating liquid and improve the dielectric strength. SOLUTION: In place of transformer mineral oil which is conventionally used as an insulating oil 1 of an AC/DC conversion transformer, perfluorocarbon (PFC) liquid which has a higher volume resistivity than the mineral oil is used in order to increase the DC voltage allotment of the insulating liquid (PFC liquid) 1 in comparison with the DC voltage allotments of respective insulators such as a spacer 15 and the covering insulator 10d of a stress-relief shielding ring 10 at a combination part B composed of the insulators 15 and 10d. This constitution can suppress a DC potential distribution at that part B can be equalized and a DC high electric field produced at that part in the insulating liquid 1.

4. 发明专利

JPH09190934A DC TRANSMISSION TRANSFORMER 失效
公开(公告)号：JPH09190934A
公开(公告)日：1997-07-22
申请号：JP253596
申请日：1996-01-10
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO , SHIKOKU ELEC POWER , ELECTRIC POWER DEV CO
发明人： KADOWAKI SHIN , OBATA TOSHIMITSU , KOJIMA KEIMEI , SEKINE KAZUO , TANAKA MAKOTO , SUGIHARA HIROSHI , MAKINO YOSHINORI
IPC分类号： H01F27/32 , H01F27/36
摘要： PROBLEM TO BE SOLVED: To provide the transformer, which decreases the electric-field value of the DC voltage applied in the direction of the layer along the insulating material comprising oil impregnated paper at the boundary part of an insulating spacer and an electric-field alleviating shield ring, or the boundary part of the edge part of a DC winding and the insulating spacer and or at the above described both boundary parts. SOLUTION: A DC voltage bearing cylindrical insulating plate 18 comprising oil impregnated paper is provided at the inner-diameter side and the outer- diameter side in contact with the region from the paper side of the overlapped part of the lower edge of an insulation-reinforcing cylindrical insulator 17 of a DC winding 5 and the upper surface of an insulating spacer 15 to the lower side of an oil gap formed between the lower surface of the insulating spacer 15 and the upper corner part of an electric-field alleviating shield ring 10. Here, the DC voltage, which is applied on the above described overlapped part and the oil gap is borne with the layer penetrating direction A of the insulating plate 18.

5. 发明专利

JP2000315609A STATIONARY INDUCTION APPARATUS 失效
公开(公告)号：JP2000315609A
公开(公告)日：2000-11-14
申请号：JP12556999
申请日：1999-05-06
申请人： HITACHI LTD
发明人： RI TOUI , SHIOHATA HIRONORI , KADOWAKI SHIN , YAMAGISHI AKIRA
IPC分类号： H01F27/33 , H01F30/00 , H01F30/12
摘要： PROBLEM TO BE SOLVED: To provide a low noise stationary induction apparatus which effectively controls a oscillation transmission from tank side panels to an oscillation suppressing steel plate for sound shielding, has a low cost and a simple construction. SOLUTION: This stationary induction apparatus is provided with a main unit and an insulating medium 2 constituted of an iron core, a coil and so on, a tank 3 for containing the main unit 1 and the insulating medium 2, a plurality of reinforced stays 4 provided at a constant interval at the outside of the tank side plates 3a, a frame shape attachment member 6 provided on the reinforced stays 4 and a sound shielding plate 5 constituted of a thin steel plate 5a attached with the attachment member 6, an oscillation suppressing steel plate 5b, and a frame shape weight body 5c. In this case oscillation suppressing paint 7a is applied on the surface of the thin steel plate 5a and oscillation suppressing paint 7a is applied on the surface of a bonding part of the attachment member 6 and the attachment member 6 of the tank 3.

6. 发明专利

JP2000340432A STATIONARY INDUCTION ELECTRIC APPARATUS 失效
公开(公告)号：JP2000340432A
公开(公告)日：2000-12-08
申请号：JP14933199
申请日：1999-05-28
申请人： HITACHI LTD
发明人： KADOWAKI SHIN , OTA TAKESHI , YAMAGISHI AKIRA
IPC分类号： H01F27/33
摘要： PROBLEM TO BE SOLVED: To secure the area for installing a noise insulation plate to sufficiently reduce the noise by installing a second noise insulation plate so as to cover an upper and a lower reinforcing stay formed on the outer surface of a tank and a noise insulation plate. SOLUTION: A U-shaped frame supporting structure 13 is installed in an upper part of an upper reinforcing stay 3. In a lower part of a side plate 2 of a tank 1, a U-shaped frame supporting structure 15 is so installed as to overhang the side plate 2. Then, a second noise insulation plate 12 formed from a damping steel plate which uses the frame supporting structure 13 formed in the upper reinforcing stay 3 as an upper supporting point and the frame supporting structure 15 formed as to overhang the side plate 2 of the tank 1 as a lower supporting point is so installed as to cover the upper and the lower reinforcing stays 3, 4 installed on the outer surface of the tank 1 and a noise insulation plate 11. Accordingly, a sufficient area can be secured for installing a noise insulation plate and thereby the noise can be sufficiently reduced.

7. 发明专利

JP2014143864A Power conversion device and dc power transmission system 有权
标题翻译：电力转换装置和直流电力传输系统
公开(公告)号：JP2014143864A
公开(公告)日：2014-08-07
申请号：JP2013011609
申请日：2013-01-25
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： INOUE SHIGENORI , KATO SHUJI , KIYOFUJI YASUHIRO , KADOWAKI SHIN , FUJITA HIROYUKI , OGATA HIDEKI
IPC分类号： H02M7/12
CPC分类号： H02M7/797 , H02J3/36 , H02M2007/4835 , Y02E60/60
摘要： PROBLEM TO BE SOLVED: To solve the problem that, when an earth-fault or short-circuit accident occurs in a DC power transmission line dependently on a self-/inter-inductance relation of a transformer winding, in an HVDC, there may be cases that a DC accident current may also flow to a primary winding of a transformer, namely, to an AC system side as a zero-phase DC current.SOLUTION: A power conversion device is provided which comprises a three-phase transformer including at least four three-phase windings, and three converter arms formed by connecting in series one or more unit converters each including a switching element and an energy storage element. In the power conversion device, a power source or a load is connected to a first three-phase winding of the transformer, three serial circuits of second and third three-phase windings of the transformer and the converter arms are connected in parallel, and a parallel connection point is used as a DC terminal. The power conversion device is characterized in that a magnitude relation of a coupling coefficient between the first three-phase winding and the second and third three-phase windings is equal to a magnitude relation of a coupling coefficient between a fourth three-phase winding and the second and third three-phase windings.
摘要翻译：要解决的问题：为了解决当直流输电线路发生接地故障或短路事故时，依赖于变压器绕组的自相互/电感之间的关系，在HVDC中可能存在 DC事故电流也可能流向变压器的初级绕组，即作为零相DC电流的AC系统侧的情况。解决方案：提供一种电力转换装置，其包括至少包括三相变压器四个三相绕组和三个转换器臂，其通过串联连接一个或多个单元转换器而形成，每个单元转换器包括开关元件和能量存储元件。在电力转换装置中，将电源或负载连接到变压器的第一三相绕组，变压器的第二和第三三相绕组的三个串联电路和转换器臂并联连接，并联连接点用作直流端子。功率转换装置的特征在于，第一三相绕组与第二和第三三相绕组之间的耦合系数的大小关系等于第四三相绕组与第三三相绕组之间的耦合系数的大小关系，第二和第三三相绕组。

8. 发明专利

JP2002134336A LOW-NOISE TRANSFORMER 失效
公开(公告)号：JP2002134336A
公开(公告)日：2002-05-10
申请号：JP2000332125
申请日：2000-10-26
申请人： HITACHI LTD
发明人： RI TOUI , NEMOTO KANAKO , KADOWAKI SHIN , MUNEDA YASUYUKI
IPC分类号： H01F27/33 , H01F27/02
摘要： PROBLEM TO BE SOLVED: To provide a low-noise transformer that can reduce vibration-radiated sounds by efficiently intercepting the fixed propagation of vibrations, from the main body of the transformer to the side face of a tank. SOLUTION: This low-noise transformer has a body 1, an insulating medium 2, a tank 1 housing the body 1 and medium 2. The transformer also has reinforcing ribs 6 attached to the bottom face 3a of the tank 3. Above the foundation 7 of the transformer, in addition, the reinforcing ribs 6 are divided into central part reinforcing ribs 6a and peripheral section reinforcing ribs 6b and thin corrugated steel sheets 9 which are coated with damping paint 10 (or carrying stuck damping materials) are provided on the bottom face 3a of the tank 3 between the central part reinforcing ribs 6a and the peripheral section reinforcing ribs 6b.

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