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21. 发明专利

JPH09154231A POWER TRANSMISSION SYSTEM USING GAS INSULATED PIPELINE 失效
公开(公告)号：JPH09154231A
公开(公告)日：1997-06-10
申请号：JP30908795
申请日：1995-11-28
申请人： HITACHI LTD
发明人： OZAWA ATSUSHI , OISHI KAZUYA , SHINDO KATSUJI , OSHITA YOICHI , NATSUI KENICHI
IPC分类号： H02H9/04 , H02B13/02
摘要： PROBLEM TO BE SOLVED: To decrease the occurrence of insulation accidents due to surge voltage by lowering incoming overvoltage than those restricted by zinc oxide lightening arrestors for power station and substation by providing a surge damper tank equipment for attenuating the surge between a gas insulated pipeline and zinc oxide type lightening arrestors at power station and substation. SOLUTION: Surge damper equipment 40 are provided between a gas insulated pipeline 5 and zinc oxide lightening arrestors 6 in a power station and a substation at side 1 and between the gas insulated pipeline 5 and zinc oxide lightening arrestors 7 in a power station and substation at side 2. By doing this, an attenuation effect of the surge damper equipment 40 against surge or a surge restricting effect by zinc oxide lightening arrestors 6 and 7 located scatteredly in power station and substations are able to make overvoltage (surge voltage) generated in gas insulated pipeline 5 in a transmission system lower than the values restricted by zinc oxide lightening arrestors 6 and 7 for power station and substations. Therefore, the occurrence of insulation accidents due to surge voltage can be reduced.

22. 发明专利

JPH08233915A CUT-OFF TESTER FOR RESISTANCE CUT-OFF TYPE BREAKER AND CUT-OFF TESTING METHOD USING THE SAME 失效
公开(公告)号：JPH08233915A
公开(公告)日：1996-09-13
申请号：JP3861795
申请日：1995-02-27
申请人： HITACHI LTD
发明人： OSHITA YOICHI , OONO MASATOMO , SATO MINORU , MATSUMOTO MORIHISA
IPC分类号： G01R31/327 , G01R31/00 , G01R31/333
摘要： PURPOSE: To faithfully reproduce the voltage applied between the poles of a resistance cut-off type breaker in the case of testing if a charging current is cut OFF when a transmission line is no load. CONSTITUTION: A tester which has a capacitor 31 connected between a high voltage and low current source 10 and a breaker 20 and an equivalent resistor 32 connected in parallel with the breaker 20 is used. The product of the capacity Cv of the capacitor 31 and the resistance value Re of the resistor 32 is equal to that of the stray capacity C2 of a transmission line and the resistance value R of the resistor of the breaker. When the main breaking part 1 of the breaker 20 is opened, if a voltage is applied to the breaker 20 via the capacitor 31 from the source 10, the voltage between the poles of the part 1 exhibits the same waveform as the voltage waveform between the poles of the breaker of a transmission system.

23. 发明专利

JPH0869731A GAS-INSULATED SWITCH GEAR 失效
公开(公告)号：JPH0869731A
公开(公告)日：1996-03-12
申请号：JP20484594
申请日：1994-08-30
申请人： HITACHI LTD
发明人： KOBAYASHI MASATOMO , HOKUTOU HIROMICHI , OSHITA YOICHI , SAKAGUCHI MINORU
IPC分类号： H01H33/00 , H02B13/045 , H02G5/06
摘要： PURPOSE: To prevent in principle the induction of a steep wave surge likely to be generated with opening and closing of each apparatus in an electrically insulated place on the connection part through an insulation of tanks of a gas- insulated switch for an enclosed power station or sub-station of SF6 gas insulation type. CONSTITUTION: Using an electroconductive substance 12 having a high specific resistivity an electric connection is generated between a washer 5 and a tank 1 in a place where tanks 1, 2 are connected through an insulation 13 of a gas- insulated switch. Accordingly no steep wave surge is induced in the insulation in principle, so that the reliability is enhanced, the structure simplified, the number of component parts decreased, and the economy is enhanced.

24. 发明专利

JPH06265580A FULL-VOLTAGE INTERRUPTION TEST EQUIPMENT FOR GAS INSULATED SWITCHGEAR 失效
公开(公告)号：JPH06265580A
公开(公告)日：1994-09-22
申请号：JP5602293
申请日：1993-03-16
申请人： HITACHI LTD
发明人： ANNO KENJI , YAGINUMA HISAHARU , OSHITA YOICHI , SATO MINORU , OONO MASATOMO , YAMAGIWA TOKIO
IPC分类号： G01R15/14 , G01R31/12 , H02B13/02 , G01R15/02
摘要： PURPOSE:To provide a full-voltage interruption test equipment for gas insulated switchgear in which a sample ground tank can be supported easily while insulating from the earth and the test facility can be downsized. CONSTITUTION:Adisconnector 30 comprising a movable contactor 24 and a fixed contactor 29 housed in a ground tank 21 is supported in a test ground tank 11 filled with insulation gas through an insulating support 27, and a high voltage supply is connected with a high voltage lead-in part 21a on the ground tank 21 through a conductor 26. A low voltage high current source is connected between the movable connector 24 and a low voltage high current terminal 13 connected with the fixed contactor 29, and an operating unit 10 for switching the movable contactor 24 of the disconnector 30 is mounted on the test ground tank 11 while being insulated electrically therefrom.

25. 发明专利

JPH05223905A COMBINED TESTING DEVICE FOR CIRCUIT BREAKER 失效
公开(公告)号：JPH05223905A
公开(公告)日：1993-09-03
申请号：JP3036992
申请日：1992-02-18
申请人： HITACHI LTD
发明人： KOYANAGI OSAMU , KASHIMURA KATSUICHI , OSHITA YOICHI , KUROSAWA YUKIO , SATO MINORU , TAKAHASHI ISAO
IPC分类号： G01R31/327 , G01R31/333
摘要： PURPOSE:To improve economic and time efficiency by totally deciding breaking performance of a circuit breaker by using a combined testing circuit for generating 4-parameter transition recovery voltage(TRV) waveform and 2-parameter TRV waveform. CONSTITUTION:Current ic is supplied from a power source 2 through a reactor 3 for adjusting current, a short-circuit transformer 4, a first auxiliary circuit breaker 5 and a circuit breaker 1 to be tested. At the same time, short-circuit small current which ia smaller than the current ic is supplied to an auxiliary switch 10 from a short-circuit voltage device 7 through a rector 8 and a second auxiliary circuit breaker 9. Since a capacitor 23 is charged subsequently by current i3 after current i2 is shut, the voltage of transition recovery voltage (TRV)2 is raised with delay. As a result, TRV waveforms appropriate for TRV display of 4-parameter TRV of TRV, +TRV2 can be applied to the circuit breaker 1 to be tested. Economy in enforcing voltage source circuit facility associated with voltage increase per breaking point of a breaker has a large effect in reducing the capacity of a capacitor.

26. 发明专利

JPH0520984A RESISTANCE INTERRUPTING TYPE CIRCUIT BREAKER 失效
公开(公告)号：JPH0520984A
公开(公告)日：1993-01-29
申请号：JP19734291
申请日：1991-07-12
申请人： HITACHI LTD
发明人： OSHITA YOICHI , KASHIMURA KATSUICHI , HASHIMOTO TAKESHI , KOYANAGI OSAMU , KUROSAWA YUKIO
IPC分类号： H01H33/70
摘要： PURPOSE:To provide a resistance interrupting type circuit breaker of high reliability having the capability of preventing a breaking failure accident. CONSTITUTION:Resistance interrupting sections 2A and 2B comprising a puffer type gas interrupting section, are connected in series to main interrupting sections 1A and 1B comprising a buffer type gas interrupting section. In addition, interrupting resistance bodies 3A and 3B are connected in parallel to the main interrupting sections 1A and 1B. Also, the resistance interrupting sections 2A and 2B are so constituted as to have a diameter equal to or larger than the diameter of the puffer cylinders of the sections 1A and 1B, in order to have breaking capability for main target interrupting current bypassing the sections 3A and 3B.

27. 发明专利

JPH03254032A GAS-BLAST CIRCUIT BREAKER 失效
公开(公告)号：JPH03254032A
公开(公告)日：1991-11-13
申请号：JP4929890
申请日：1990-03-02
申请人： HITACHI LTD
发明人： HASHIMOTO TAKESHI , OSHITA YOICHI , ISHIKAWA KOJI
IPC分类号： H01H33/70 , H01H33/91
摘要： PURPOSE:To improve dielectric strength of a gas-blast circuit breaker by forming specified gas flow passages other than a throat of a nozzle in the outside-diameter portion of the throat of the nozzle that blows arc-extinguishing gas upon an arc generated between a stationary arc contact and a movable arc contact. CONSTITUTION:Insulating gas compressed by a cylinder 4 and a piston 5 is led to a nozzle 1 made of an insulator, and then blown upon an arc generated between a movable contact 6 and a stationary arc contact 2. The nozzle 1 has holes 9 which communicates the downstream side 8 of the nozzle with the upstream side 11 thereof formed in the peripheral portion of a nozzle throat 10. Each of the holes 9 is formed such that a difference between a cross-sectional area (s) made by the flow of gas through the hole 9 in the process of breaking a circuit and the cross-sectional area (S) of the stationary arc contact is not less than the cross-sectional area of the nozzle throat 10 and not more than twice thereof. This constitution can prevent the phenomenon of transiently lowering the pressure of gas at the head of the stationary arc contact, which is presented immediately after the head of the stationary arc contact goes out of the nozzle throat 10, and also can heighten the pressure of gas at the head of the stationary arc contact in a wide range of the circuit-breaking process.

28. 发明专利

JPH0236724A ABNORMAL POWER SUPPLY MONITOR FOR CIRCUITBREAKER 失效
公开(公告)号：JPH0236724A
公开(公告)日：1990-02-06
申请号：JP18361888
申请日：1988-07-25
申请人： HITACHI LTD
发明人： OSHITA YOICHI , HASHIMOTO TAKESHI , KUROSAWA YUKIO
IPC分类号： H02B13/065 , H02H5/04
摘要： PURPOSE:To improve selection reliability of abnormal power supply in a tank by arranging an infrared camera at a high position where the tank in a gas insulated switchgear is viewed with a specific angle of depression. CONSTITUTION:An infrared camera 903 is secured through utilization of a steel fence 905 installed for securing the lead-in port of a transmission line in a substation yard. Tanks 906, 906', 906'' to be measured in a phase separation type gas insulation switchgear are secured through a foot 907 onto the ground face 908. The infrared camera 903 is set to view the tanks 906, 906', 906'' with an angle of depression larger than 20 deg.. The infrared camera 903 is contained in a protective case 909 and lifted or lowered through a wire 915.

29. 发明专利

JPH01274606A ABNORMAL POWER CONDUCTION DETECTOR FOR GAS INSULATED SWITCHGEAR 失效
公开(公告)号：JPH01274606A
公开(公告)日：1989-11-02
申请号：JP10256888
申请日：1988-04-27
申请人： HITACHI LTD
发明人： OSHITA YOICHI , HASHIMOTO TAKESHI , KUROSAWA YUKIO , OKUMURA KIYOSHI
IPC分类号： G01R31/00 , H02B13/065 , H02H5/04
摘要： PURPOSE:To detect abnormality with high accuracy, by arranging a temperature sensor on the outer face of a container containing a plurality of high potential conductors and switchgear sections and encapsulating insulating gas, and measuring the temperature from 10:00PM to 6:00AM. CONSTITUTION:Insulating gas SF6 is filled in containers 1-1'' in which high potential conductors 3, 3' and switchgear sections 4 are supported. Thermo- couples 7-7'' are arranged, as temperature detecting means, at the outside of the enclosed containers 1-1'', then outputs based on the temperatures T1-T3 at the positions where the thermo-couples are arranged are subjected to photo-electric conversion and transmitted through optical fibers 8-8'', then they are amplified and subjected to A/D conversion 10 and transmitted to a processor 11. The processor 11 samples data from 10: 00PM to 6:00AM and produces an alarm if the maximum value of the temperature difference T1-T2, T2-T3, T3-T1 exceeds over a reference value of 1 deg.C, for example. By such arrangement, erroneous operation due to the influence of ambient temperature can be avoided and the temperature difference due to abnormal power conduction can be detected with high accuracy.

30. 发明专利

JPH01232626A ABNORMAL CURRENT SUPPLY SENSING DEVICE FOR GAS-INSULATED SWITCHING APPARATUS 失效
公开(公告)号：JPH01232626A
公开(公告)日：1989-09-18
申请号：JP5831888
申请日：1988-03-14
申请人： HITACHI LTD
发明人： OSHITA YOICHI , HASHIMOTO TAKESHI , KUROSAWA YUKIO , INUI YOSHIAKI
IPC分类号： G01R31/327 , G01R31/333 , H01H11/00 , H01H33/00 , H02H3/50
摘要： PURPOSE:To sense abnormality in current supply in high precision by furnishing a means to sense vibration, measuring vibrations in the range 200-5000Hz, and judging abnormal supply of current when a vibration in this frequency range is sensed. CONSTITUTION:When a breaker 1 is to be sensed by a piezo type acceleration sensor 2 as vibration sensing means SF6 gas as insulation gas is encapsulated in an airtight tank 3 at 5atom, approximately. Examples of abnormality in current supply are wear or deterioration of the breaker electrode due to excessive number of current shutoffs, poorly performed putting-on due to any failure in a movable electrode driving actuator, insufficient contact force due to deterioration of a pressure spring, and poorly performed assembly. Because vibration will be generated in early timing when abnormality in current supply has initiated and is progressing, this is sensed by the abovementioned acceleration sensor 2. Abnormality can be sensed without impairing the reliability of current supply, but because the vibration phenomenon is comparatively large as 0.001-0.1G approximately and the frequency range is 200-5000Hz, the procedure does not require use of any commercially available acceleration sensor. The output signal from the acceleration sensor 2 is passed to a sensor 15 via a preamplifier 12 and a band-pass filter 14, and abnormality is sensed precisely.

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