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1. 发明专利

JP2000059929A INSULATION FLANGE 失效
公开(公告)号：JP2000059929A
公开(公告)日：2000-02-25
申请号：JP22562598
申请日：1998-08-10
申请人： HITACHI LTD
发明人： SHINDO KATSUJI , OZAWA ATSUSHI , ENDO FUMIMASA , KOBAYASHI MASATOMO , YAGIHASHI YOSHITOYO
IPC分类号： H02B13/02
摘要： PROBLEM TO BE SOLVED: To prevent aerial flash discharge and deterioration of an insulating member by forming the insulating member into a ring shape, fitting a protruding discharging electrode to an insulation inside, and forming a discharging route at a distant position from the surface running along the insulating member, thereby suppressing induced surge voltage at a discharging interval in the insulating member. SOLUTION: In this insulation flange of a gas insulation switching device, an insulation spacer 3 is jointed between the flange 1a of a metallic container 1 and the flange 2a of a metallic container 2, and an insulating member 9 with a discharging clearance built in is formed between a stud bolt 4 and the flange 2a and is fixed with a metallic nut 7 through a metallic washer 6. The insulating member 9 with a discharging clearance built in is formed with ring-shaped insulating members 9a, 9b to have insulation and discharging interval, at the upper and lower parts of which an upper electrode 10a and a lower electrode 10b are formed which has a stud bolt insertion hole in the middle part and whose outer periphery is formed into a protruding shape, and a discharging interval 11 is formed for integration. It is thus possible to prevent flash discharge at the insulation flange and insulation deterioration due to discharging of the insulating member.

2. 发明专利

JPH11354338A TRANSFORMER 失效
公开(公告)号：JPH11354338A
公开(公告)日：1999-12-24
申请号：JP16177298
申请日：1998-06-10
申请人： HITACHI LTD
发明人： OZAWA ATSUSHI , SHIRASAKA YUKIYASU
IPC分类号： H01F27/34 , H01F30/12
摘要： PROBLEM TO BE SOLVED: To suppress potential vibration suitably, by connecting a plurality of windings in series, and providing capacitors having the specified values in parallel at the winding on the high voltage side of the high-voltage winding, which generates one voltage. SOLUTION: A high voltage winding connects a high voltage side winding 1 linked to a high voltage terminal and a winding 2 on the grounding side in series. A high voltage terminal conductor 3 is located at the center of the high voltage side winding. Intermediate connecting conductors 4 are taken out from both ends of the high voltage side winding 1. Then potential vibration suppressing capacitors 14 and 15 are provided in parallel between the high voltage terminal conductor 3 and the intermediate connecting conductor 14. Furthermore, as the potential vibration suppressing capacitors 14 and 15, ceramic capacitors are used or oil immersed capacitors are used in the case of especially an oil-immersed transformer. Furthermore, the capacitance component of the zinc oxide element having the excellent nonlinearity is also used. A plurality of the ceramic capacitors and the zinc oxide element are contained in an insulated tube so that these parts are readily attached between the winding terminals.

3. 发明专利

JPH10304542A GAS-INSULATED SWITCHGEAR 失效
公开(公告)号：JPH10304542A
公开(公告)日：1998-11-13
申请号：JP10951297
申请日：1997-04-25
申请人： HITACHI LTD
发明人： TANAKA SHIGERU , OSHITA YOICHI , YAMADA SEIICHI , TAKAHASHI KEN , OISHI KAZUYA , OZAWA ATSUSHI , TAKAMOTO MANABU
IPC分类号： H02B13/02 , H02G5/06
摘要： PROBLEM TO BE SOLVED: To provide a gas-insulated switchgear fitted with a surge-suppressing means compact and capable of suppressing surges effectively as well. SOLUTION: In a gas-insulated switchgear, a voltage nonlinear component 14 being in contact with the flange 5 surface of a metal sheath 3 is made of a ceramic which contains 85%-98% of zinc oxide, is in the shape of a disk-like substance having a through-hole in the center part. Electrodes are formed on both surfaces having the through-hole, and glass layers are formed on the external and internal peripheral surfaces of the disk-like substance. Moreover, a metal plate having a through-hole similar to the through-hole is formed integrally and fixed to at least one of the electrodes. Consequently, it becomes possible to make a surge suppressing means compact and insulatable from the voltage with respect to commercial frequencies, and to effectively suppress high-frequency surges.

4. 发明专利

JPH10270212A VOLTAGE NONLINEAR RESISTOR AND MANUFACTURE THEREOF 失效
公开(公告)号：JPH10270212A
公开(公告)日：1998-10-09
申请号：JP7365797
申请日：1997-03-26
申请人： HITACHI LTD
发明人： TANAKA SHIGERU , YAMADA SEIICHI , TAKAHASHI KEN , SHOJI MORITAKA , SHIRAKAWA SHINGO , OZAWA ATSUSHI
IPC分类号： H01C7/10
摘要： PROBLEM TO BE SOLVED: To restrain a voltage nonlinear resistor from varying in characteristics, even after it absorbs shock waves such as impulse surges by a method, wherein a high-speed mixing process which limits a ratio of an area occupied by ZnO of segregation phase around ZnO particles to a specific range is provided before a granulating process is carried out. SOLUTION: A voltage nonlinear resistor, which is formed in constituting phases, mainly composed of a ZnO phase 1 and a segregation phase 2 other than the former at peaks of X-ray diffraction and indicates characteristics that a current varies with a change in voltage, is basically manufactured in a manner such that starting martial powder is successively kneaded, granulated, molded, and burned. At this point, powder is kneaded at a high speed before powder is granulated, so as to limit a ratio of a area occupied by ZnO of segregation phase around ZnO particles to the area of ZnO particles to a specific range of 5 to 30% after burning. Alternatively, a mixed powder or granulated power is mixed at a high circumferential speed of 5 to 17 m/sec through the intermediary of ceramic beads.

5. 发明专利

JPH09320816A PORCELAIN-CLAD TYPE ARRESTER 失效
公开(公告)号：JPH09320816A
公开(公告)日：1997-12-12
申请号：JP13999896
申请日：1996-06-03
申请人： HITACHI LTD
发明人： OZAWA ATSUSHI , OISHI KAZUYA , SHINDO KATSUJI , ITO MORIO
IPC分类号： H01C7/12 , H01B17/46 , H01T1/16 , H01T4/04
摘要： PROBLEM TO BE SOLVED: To provide a polymer porcelain-clad type arrester which can be applied to a zinc oxide element having a limit voltage of about 300V/mm or more for 1mA by lightening influences of water permeability of polymer porcelain clad. SOLUTION: The porcelain-clad type arrester comprises a group of elements 4 arranged in stack and an insulating outer sheath 1 of a cylinder shape arranged so as to cover the element group 4. The insulating outer sheath 1 is made of polymer porcelain clad. In this case, zinc oxide elements having a limit voltage of about 300V/mm or more for 1mA are used as the group of elements 4, the group elements 4 are arranged and dispersed in its stacked direction, dispersion electrodes 5 are disposed between the group elements 4, as well as are provided with water adsorptive agent.

6. 发明专利

JPH0759209A OVERHEAD EARTH WIRE FACILITY FOR LEVITATION RAILWAY 失效
公开(公告)号：JPH0759209A
公开(公告)日：1995-03-03
申请号：JP19736793
申请日：1993-08-09
申请人： HITACHI LTD , TOKAI RYOKAKU TETSUDO KK
发明人： OZAWA ATSUSHI , OKAI MASAHIKO
IPC分类号： B60L13/04 , B60M1/12 , B60M7/00
摘要： PURPOSE:To reduce the voltage induced between coil terminals connected in series with a guideway as low as possible and to prevent fault due to dielectric breakdown caused by lightning stroke. CONSTITUTION:A single overhead earth wire is installed in parallel with a row of coils arranged on a guide way 5 at a level of a central plane X-X' in the vertical direction or a lightning stroke shielding conductor is installed above that level while being connected therewith. Alternatively, two overhead earth wires 7a, 7b are disposed symmetrically to the central plane X-X' on the upper and lower sides of the side wall 3 while being connected through a continuous lead wire 9 or a lead wire provided with an air gap. Since the amount of flux, induced by a lightning current flowing through the overhead earth wires 7a, 7b and interlinking the coils connected in series, decreases drastically, the voltage induced across the coil 6 can be reduced.

7. 发明专利

JPH0674986A MEASUREMENT DIAGNOSTIC DEVICE 失效
公开(公告)号：JPH0674986A
公开(公告)日：1994-03-18
申请号：JP22831392
申请日：1992-08-27
申请人： HITACHI LTD
发明人： TAKAHASHI ISAO , ISHIKAWA TOSHIO , ENDO FUMIMASA , YAMAGIWA TOKIO , OZAWA ATSUSHI , ENDO KAORU
IPC分类号： G01R31/00
摘要： PURPOSE:To provide a measurement diagnostic device capable of proper operation at all times even under cold environment by causing the power supply of an external memory device to be turned on, as soon as temperature reaches proper service level. CONSTITUTION:A power switch SW1 is turned on, thereby exciting a relay coil 2 via a closed bimetal 1, and closing the 'a' contact 3 of a relay. Also, power is thereby supplied to a heater 4 and a lamp 5, and the heater 4 generates heat. On the other hand, the 'b' contact 7 of the relay opens due to the excitation of the coil 2, and no power is supplied to a hard disk. When the temperature of the hard disk reaches level within a service temperature range and the bimetal 1 opens, the excitation of the coil 2 is stopped and the contact 3 opens, while the contact 7 closes. As a result, current to the heater 4 and the lamp 5 is interrupted, and power supply to the hard disk begins. According to this construction, power is supplied, only when the temperature of the hard disk is within a proper range. Thus, the proper startup of the hard disk can be ensured, thereby enabling measurement diagnosis or the like to be undertaken.

8. 发明专利

JPH05234718A 失效
公开(公告)号：JPH05234718A
公开(公告)日：1993-09-10
申请号：JP3651192
申请日：1992-02-24
申请人： HITACHI LTD
发明人： OZAWA ATSUSHI , OISHI KAZUYA , SHINDO KATSUJI
IPC分类号： H01C7/12 , H01T1/16
摘要： PURPOSE:To reduce the size of an enclosed vessel by laying out a plurality of component groups in the enclosed vessel, allowing each component group to have a plurality of column-shaped laminated articles respectively and face the adjoining components groups with the column-shaped multilayered members and forcing each of the opposed column-shaped multilayered bodies to equalize the potential at each position in their lamination direction. CONSTITUTION:Groups of components 100, 200, 300 and 400, which comprise three column-shape multilayered bodies respectively, are laid out an enclosed vessel into which an insulation medium is sealed. These groups 100, 200, 300 and 400 are adapted to set up laid out their single column-shaped multilayered body respectively on a virtual circle which envelops the center of the enclosed vessel. At the same time, they laid out in such a fashion that their adjoining component groups and tow column-shaped multilayered bodies may be opposed to each other in their proximity respectively. The opposed column-shaped multilayered bodies are constituted by forming insulation spacers 3 of zinc oxide devices 2 in such a fashion that each part in their vertical direction may be virtually the same potential.

9. 发明专利

JPH04332416A GAS DISCONNECTOR AND GAS INSULATING SWITCH DEVICE 失效
公开(公告)号：JPH04332416A
公开(公告)日：1992-11-19
申请号：JP13159291
申请日：1991-05-08
申请人： HITACHI LTD
发明人： OZAWA ATSUSHI , ISHIKAWA TOSHIO , KUROSAWA YUKIO
IPC分类号： H01H33/16 , H01H31/32 , H01H33/12
摘要： PURPOSE:To provide a gas disconnector capable of surely cutting off an accident current all the time without exerting an adverse effect on the operation of the disconnector disposed in a system while maintaining a sufficient re-ignition surge restraining function. CONSTITUTION:In an open state, a main stator 6 and an auxiliary stator 8 are connected to a main moveble piece 16 and an auxiliary movable piece 17, respectively. Accordingly, since a portion of an auxiliary conductor 7, penetrating through a cylindrical magnetic body 9 is short-circuited by the main stator 6 and the main movable piece 16, there is no effect on the operation of a disconnector disposed in a system. At the time of disconnection, the auxiliary movable piece 17 is later disconnected from the auxiliary stator 8, so that a current is supplied to the portion of the auxiliary conductor 7, penetrating through the cylindrical magnetic body 9, thus sufficiently exhibiting a re-ignition surge restraining function.

10. 发明专利

JPH0491636A INDUSTRIAL POWER SOURCE SYSTEM 失效
公开(公告)号：JPH0491636A
公开(公告)日：1992-03-25
申请号：JP20501090
申请日：1990-08-03
申请人： HITACHI LTD
发明人： OZAWA ATSUSHI , TAKAHASHI ISAO , OGA EIGO , TANIMIZU TORU
IPC分类号： H02J9/08
摘要： PURPOSE:To obtain high reliability of supplying power to a more important load and to obtain an industrial power source system having economical bus structure and non-utility generator by dividing a single bus to a plurality of sections, integrally providing a load of high importance at an inner bus, and connecting the non-utility generator thereto. CONSTITUTION:A power source system has single buses 3, 4, 5 divided into two transformers 1, 2, an important load 6, general loads 7, 8, a control board 30, and a non-utility generator 31. If the transformer 1 break down, a breaker 26 is closed under the control of the board 30, and power is not stopped to the load 6. Further, if both the transformers 1, 2 break down, an industrial power source system is disconnected from a power transmission system under the similar control to the above, the generator 31 is started, and a breaker 27 is closed. Accordingly, power is not stopped to the load 6. Thus, the reliability of supplying power to the load of high importance can be improved, and the output capacity of the generator has a capacity enough to supply power to the load of high importance.

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