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91. 发明专利

JP2001238313A GAS-INSULATED SWITCH DEVICE 失效
公开(公告)号：JP2001238313A
公开(公告)日：2001-08-31
申请号：JP2000049173
申请日：2000-02-25
申请人： HITACHI LTD
发明人： KATO TATSURO , ENDO FUMIMASA , UCHIUMI TOMOAKI , KOBAYASHI KAZUO
IPC分类号： H02B13/02
摘要： PROBLEM TO BE SOLVED: To reduce the total size of a gas-insulated switch device. SOLUTION: A cylindrical metal housing 1 is grounded, and the interior thereof is filled with the SF6 gas as insulation gas. To the metal housing 1, a bus bushing 8 having a high-voltage conductor and a line bushing 9 are mounted. Moreover, within the metal housing 1, a circuit breaker 4, a disconnection device 5 and a grounded switch 6 are provided and these elements 4, 5, 6 are opened on a single plane. The circuit breaker 4 is installed to open in the horizontal direction, the disconnecting device 5 is installed to open in the inclined direction for the horizontal direction, and the ground switch 6 is installed to open in the longitudinal direction, respectively.

92. 发明专利

JP2001035409A CATHODE-RAY TUBE 失效
公开(公告)号：JP2001035409A
公开(公告)日：2001-02-09
申请号：JP20866499
申请日：1999-07-23
申请人： HITACHI LTD
发明人： KOBAYASHI KENZO , ENDO FUMIMASA
IPC分类号： H01J29/48 , H01J29/54
摘要： PROBLEM TO BE SOLVED: To provide a cathode-ray tube with its STC drift suppressed. SOLUTION: A cathode-ray tube includes an electron gun composed of a cathode 9, grid electrodes 10, 11, 12, 13, 14, 15, and a shield cup 16, a deflection yoke 3 to deflect an electron beam 1 emitted from the electron gun, a fluorescent screen 2 to make visible the image drawn by the electron beam 1, and a neck glass 6 for sealing the electron gun in vacuum. According to one example of embodiment, an electrode 17 having a fixed potential for suppressing STC drift is installed on the atmospheric side surface of the neck glass in the neighbourhood of focus electrodes (a fifth grid electrode (G5) 14 and a sixth grid electrode (G6) 15). Thereby potential variation on the neck glass 6 can be suppressed.

93. 发明专利

JP2001016721A GAS INSULATED ELECTRIC APPARATUS 失效
公开(公告)号：JP2001016721A
公开(公告)日：2001-01-19
申请号：JP17777599
申请日：1999-06-24
申请人： HITACHI LTD
发明人： UCHIUMI TOMOAKI , ENDO FUMIMASA , YAGIHASHI YOSHITOYO
IPC分类号： H02B13/055 , H02B13/02 , H02B13/065
摘要： PROBLEM TO BE SOLVED: To ensure both of required dielectric strength after the commencement of operation and breakdown pressure during a test by mounting a dielectric strength improving means, based on the temperature distribution after a mixed gas is charged. SOLUTION: A dielectric strength improving means is mounted, based on the temperature distribution after mixed gas is charged, so as to stand pressure for test voltage while required dielectric strength is being ensured during operation. Upper SF6 gas concentration is lower than when it is uniform, and the dielectric strength lowers in a breaker 41, the insulation distance of an upper high voltage part 44 is made longer than that of the lower high voltage part 42, prevent the dielectric strength of the high voltage part 44 from lowering. By increasing the inclination of an insulating spacer 4d to increase creep distance, the dielectric strength is increased. Thus both the assurance of the required dielectric strength after the commencement of operation and pressure withstanding during a test are made possible.

94. 发明专利

JP2000166033A GAS-INSULATED ELECTRIC APPARATUS 失效
公开(公告)号：JP2000166033A
公开(公告)日：2000-06-16
申请号：JP33554798
申请日：1998-11-26
申请人： HITACHI LTD
发明人： ENDO FUMIMASA , UCHIUMI TOMOAKI , YAGIHASHI YOSHITOYO
IPC分类号： H02B13/055
摘要： PROBLEM TO BE SOLVED: To lessen influence of a gas-insulated electric apparatus on global warming by using, as an insulating gas, a mixed gas comprising CF3I selected based on a specific relation of the four parameters of the total gas pressure, a working temperature, a mixed quantity of CF3I and a working electric field, of a mixed gas. SOLUTION: CF3I being a typical gas comprising iodine in molecules has a low boiling point of -22.5 deg.C, and is a gas at room temperature. Its molecular weight is 195.5, and its dielectric strength at a gas pressure 0.1 MPa is 7 Vrms/ m and high, and is about 1.1 times as high as SF6. This gas is easy to dissolve by light, and its life is said to be a day or less in the atmosphere. Consequently, its global warming coefficient for 20 years is five times or less, and is small as compared with CO2, and its ozone layer destruction potential is

95. 发明专利

JP2000164040A GAS-INSULATED ELECTRIC APPARATUS 失效
公开(公告)号：JP2000164040A
公开(公告)日：2000-06-16
申请号：JP33554698
申请日：1998-11-26
申请人： HITACHI LTD
发明人： ENDO FUMIMASA , UCHIUMI TOMOAKI , YAGIHASHI YOSHITOYO
IPC分类号： H01B3/56
摘要： PROBLEM TO BE SOLVED: To reduce the contribution to the warming of the earth by sealing a mixed gas obtained by mixing two or more kinds of electrically insulating gases into current-carrying paths, and sealing an electrically insulating gas different from the mixed gas in the current-carrying paths into switches. SOLUTION: A mixed gas mixed with two or more kinds of electric insulating gases such as CF3I and N2 or CF3I and SF6 is sealed in current-carrying paths where no arc light is generated, and an electric insulating gas such as light- resistant pure SF6 different from the mixed gas in the current-carrying paths is preferably sealed into switches where arc light is generated. The maximum electric field of the current-carrying paths filled with the mixed gas is set to 16 MV/m (peak value) for a thunderbolt impulse test, and the mixed gas is preferably mixed to the partial pressure that CF3I is not liquefied at the lowest operating temperature.

96. 发明专利

JP2000162263A PARTIAL DISCHARGE DETECTOR FOR GAS INSULATED EQUIPMENT 失效
公开(公告)号：JP2000162263A
公开(公告)日：2000-06-16
申请号：JP33878998
申请日：1998-11-30
申请人： HITACHI LTD
发明人： KATO TATSURO , ENDO FUMIMASA
IPC分类号： G01R31/12 , G01R31/00 , H02B13/065 , H02G5/06
摘要： PROBLEM TO BE SOLVED: To detect partial discharge electromagnetic waves of an inner insulation fault with good S/N, even in a gas insulated equipment in which a partial discharge detector is not already provided by disposing a dipole-type antenna and metal cover along the periphery of a spacer out of a metal container. SOLUTION: When a partial discharge occurs in a metal container 3, extremely high-frequency signal current pluses of up to several GHz are generated, and electromagnetic waves is propagated into the container 3. In the container 3, its attenuation is low if a discontinuous impedance exists by means of a waveguide theory, and an electromagnetic wave signal is propagated. However, when an opening such as a spacer, a busing or the like exists, the wave leaks to the outside from it. The externally leaked electromagnetic wave signal is received by an antenna 4. The received signal is amplifier by an amplifier 9 capable of amplifying in a wide frequency band up to several GHz, and measured by a measuring instrument 10, capable of frequency analyzing or time analyzing such as a spectrum analyzer, an oscilloscope or the like.

97. 发明专利

JP2000133100A GAS-BLAST CIRCUIT-BREAKER 失效
公开(公告)号：JP2000133100A
公开(公告)日：2000-05-12
申请号：JP29933898
申请日：1998-10-21
申请人： HITACHI LTD
发明人： ENDO FUMIMASA , TOKUYAMA SHUNJI , URAI HAJIME , TSUKUSHI MASANORI
IPC分类号： H01H33/91
摘要： PROBLEM TO BE SOLVED: To accomplish high breaking performance with a small quantity of gas and to miniaturize a device by composing a two-chamber type tank style gas-blast circuit-breaker which is installed in a tank filled with a second gas after charging a first gas by sealing an end part with a supporting insulation cylinder and by furthering the exhaust of a breaking gas fully residing in an inter-electrode insulation cylinder. SOLUTION: In this circuit-breaker wherein a first gas 51 represented by SF6 excellent in insulation performance and arc-extinguishing performance is charged in a space air-tightly partitioned by a movable side case 26, and a second gas 52 represented by SF6/N2 mixture gas excellent in insulation performance is charged in a space surrounded by a main tank 14 and spacers 17a, 17b, the first gas 51 which is compressed by a cylinder 6 and a piston 7 and to which an arc generated between a fixed arc contact 1 and an movable arc contact 4 is spouted is exhausted to a sub-tank 15a via a fixed side case 25 and a supporting insulation cylinder 12a. Because a condenser 27 is installed outside an inter-electrode insulation cylinder 9, the diameter of the inter- electrode insulation cylinder 9 is minimized and the use quantity of the first gas 51 is minimized.

98. 发明专利

JPH11288629A BUSHING 失效
公开(公告)号：JPH11288629A
公开(公告)日：1999-10-19
申请号：JP2696899
申请日：1999-02-04
申请人： HITACHI LTD
发明人： SHINDO KATSUJI , ROKUNOHE TOSHIAKI , ENDO FUMIMASA , YAMAGIWA TOKIO
IPC分类号： H01B17/26 , H01B17/42
摘要： PROBLEM TO BE SOLVED: To relieve an electric field concentration of the bushing surface, prevent generation of a corona at water-wetting time, and improve fouling resistant performance and a withstand voltage characteristic by arranging inside shields in a plurality by having clearances in the shaft direction of a central conductor, and supporting the plural inside shields by the conductor. SOLUTION: Doughnut-shaped ring shields 107a, 107b, 107c grounded so that electric potential becomes grounding electric potential, are arranged around a central conductor 102 inside hollow porcelain 101. The mutual ring shields 107a, 107b, 107c are supported by plural support conductors 108a, 108b, 108c so as to form shield clearances G1, G2, G3. The clearances G1, G2, G3 between the ring shields 107a, 107b, 107c are adjusted to the clearance length in which electric potential is distributed outside by passing between the shields. It is particularly effective in enlarging the shield clearance G1 of the uppermost part, and when the clearance length between the shields is set to (G1>G2>G3), electric potential of the surface of the hollow porcelain 101 can be reduced.

99. 发明专利

JPH11219673A CATHODE-RAY TUBE AND ITS MANUFACTURE 失效
公开(公告)号：JPH11219673A
公开(公告)日：1999-08-10
申请号：JP2173898
申请日：1998-02-03
申请人： HITACHI LTD
发明人： KOBAYASHI KENZO , KOBAYASHI KAZUO , ENDO FUMIMASA , SHIRAI MASAJI , UCHIDA TAKESHI , KUROKUZUHARA MAMORU
IPC分类号： H01J29/86
摘要： PROBLEM TO BE SOLVED: To suppress the drift which is the time fluctuation of the orbit of an electron beam by applying a water-repellent material to the surface on the atmospheric side of the glass of a neck section. SOLUTION: A water-repellent material is applied to the glass 1a of a neck section to vacuum-seal an electron gun 2, thus the sticking of water molecules to the glass 1 a of the neck section from the atmospheric side is suppressed. The surface of the glass la has the hydrophilic group such as Si-O-Si or Si-OH, therefore the water-repellent material is made of organic molecules such as silicon carbide on the surface to eliminate a hydrophilic property, to improve a hydrophobic property (for water repellency), and to lower the free energy on the surface. The-CF3 group, -CF2 group, -CH3 group or -CH2 group has low surface energy, thus the glass 1a is manufactured so that these groups exist on its surface, and a siloxane polymer (e.g. polydimethyl siloxane) is used. The sticking of water molecules to the glass of the neck section is suppressed, and the time fluctuation of sticking is suppressed.

100. 发明专利

JPH10185980A ANOMALY DIAGNOSTIC SYSTEM FOR HIGH VOLTAGE POWER INSTRUMENT 失效
公开(公告)号：JPH10185980A
公开(公告)日：1998-07-14
申请号：JP13471497
申请日：1997-05-26
申请人： HITACHI LTD
发明人： OZAWA ATSUSHI , ENDO FUMIMASA , OSHITA YOICHI , YAMADA IZUMI , YAMAGIWA TOKIO , YAMADA HIROSHI , SAWAIRI MITSUO , NAGAI HAJIME
IPC分类号： G01R31/00 , G01D21/02 , G01M99/00 , G01R15/14 , G01R31/02 , G01R31/12 , H01H33/00 , H02B13/065 , H02H1/00 , H02H5/04
摘要： PROBLEM TO BE SOLVED: To accurately diagnose anomaly of high voltage instruments by providing an infrared camera so that it may look at a measuring tank at a specific angle. SOLUTION: In a region with large angle θ of looking at direction of an infrared camera 903 against the normal 902 of tank surface 901, infrared emissivity ε of the tank surface 901 becomes small. Therefore, the product of incident energy from environment to the tank surface 901 and reflection coefficient is reflected on the tank surface 901 and especially in the measurement of outdoor under fine sky, apparent radiation energy varies to be a cause of measurement error. By setting an infrared camera 903 in the position looking at the measured tank at angle of 20 degrees, for example, the angle of direction looking at the infrared camera 903 against the normal 902 at the tank upper part becomes ca. 70 degrees and emissivity ε of 0.8 can be ensured. In this manner, by setting the camera at high position, and ensuring high emissivity εat the tank upper part, temperature rise by the local heating can be accurately detected.

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