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1. 发明专利

DE69433453D1 未知
公开(公告)号：DE69433453D1
公开(公告)日：2004-02-05
申请号：DE69433453
申请日：1994-07-08
申请人： HITACHI LTD
发明人： KOMURO KATSUHIKO , KOJIMA YOSHITAKA , KUROSAWA YUKIO , KOGUCHI YOSHIO , TANIMIZU TORU , HAKAMATA YOSHIMI , ENDO SHUNKICHI
IPC分类号： B22F3/26 , C22C1/04 , C22C9/00 , H01H1/02 , H01H11/04 , H01H33/59 , H01H33/66 , H01H33/664
摘要： According to the present invention there are provided a highly reliable electrode of high strength which undergoes little change even with the lapse of time, and a method for making the same, as well as a vacuum valve using such electrode and a vacuum circuit breaker using such vacuum valve. The vacuum circuit breaker has a fixed electrode and a movable electrode, each comprising an arc electrode, an arc electrode support member for supporting the arc electrode, and a coil electrode contiguous to the arc electrode support member, the arc electrode, the arc electrode support member and the coil electrode being formed as an integral structure by melting, not by bonding, particularly the arc electrode support member and the coil electrode being constituted by a Cu alloy containing 0.05 - 2.5% by weight of at least one of Cr, Ag, W, V and Zr.

2. 发明专利

DE69129137D1 未知
公开(公告)号：DE69129137D1
公开(公告)日：1998-04-30
申请号：DE69129137
申请日：1991-09-03
申请人： HITACHI LTD , CHUBU ELECTRIC POWER
发明人： MORITA MASAO , UEDA TOSHIAKI , KUROSAWA YUKIO , ARITA HIROSHI , YAMAGIWA TOKIO
IPC分类号： H02H9/02 , F02B75/02 , H02H3/02 , H02H7/30
摘要： An electrical power system protection device has a main circuit including a circuit breaker 1 and a switch 2 connected in series to the circuit breaker 1, the main circuit being connected to a power line 115. The protection device also has a current limiting element 4 connected in parallel to the circuit breaker 1. When the level of electrical current flowing in the power line 115, detected by a current detector 7, has exceeded a predetermined first set level, a first over-current detector 8 delivers immediately a trip command to the circuit breaker. AS a consequence, any fault current such as a short-circuit current is commutated to the current limiting element 4 so as to be limited, whereby any drop of voltage in the power line upstream of the circuit breaker is greatly suppressed. When a state in which a predetermined second set level is exceeded by the detected current level is continued beyond a predetermined period, a second over-current detector 9 delivers an off command to the switch 2, thus protecting upstream portion of the power line against the fault in this power line 115. Preferably, the current level after the limitation is set to fall within a range of current which activates a momentary element of an over-current relay (OCR) 127 of a receiving end breaker 122 of a downstream sub-system, e.g., a consumer's sub-system 120, connected to the power line 115. In the event of a fail;ure in the downstream power line 120, the receiving end breaker 115 is tripped without delay so that the sound portion of the power line is reset to normal state of operation, thus achieving a harmonized protection of the electrical power system.

3. 发明专利

IN177952B A gas blast circuit breaker 未知
公开(公告)号：IN177952B
公开(公告)日：1997-03-01
申请号：IN525CA1991
申请日：1991-07-09
申请人： HITACHI LTD
发明人： TSUKUSHI MASANORI , HASHIMOTO AKIRA , SATOH MINORI , KUROSAWA YUKIO , HIRASAWA KUNIO , ENDO FUMIHIRO , YAMAGIWA TOKIO
IPC分类号： H01H83/00

4. 发明专利

DE69208935D1 未知
公开(公告)号：DE69208935D1
公开(公告)日：1996-04-18
申请号：DE69208935
申请日：1992-05-20
申请人： HITACHI LTD
发明人： OHSHITA YOUICHI , KASHIMURA KATUICHI , HASHIMOTO AKIRA , KOYANAGI OSAMU , KUROSAWA YUKIO , NISHIDA ISAO
IPC分类号： H01H33/16 , H01H33/24
摘要： A circuit breaker with a parallel resistor (7) which fulfills with a simple structure incompatible requirements for a resistance circuit making contact (2) with regard to maintenance of the dielectric strength and prearcing characteristic between electrodes, wherein a resistance circuit making contact (2) and a resistance circuit breaking contact (3) are electrically connected in parallel, one end of the parallel circuit is connected to one end of a common resistor (7) and the other end of the parallel circuit and the other end of the resistor (7) are connected to the respective ends of a main contact (1) thereby after the opening of the resistance circuit making contact (2) the resistance circuit breaking contact (3) is still closed which eliminates such an electrode structure of the resistance circuit making contact (2) as for relaxing electric field induced thereby in order to withstand a high recovery voltage conventionally applied therebetween.

5. 发明专利

DE69013720D1 未知
公开(公告)号：DE69013720D1
公开(公告)日：1994-12-08
申请号：DE69013720
申请日：1990-03-06
申请人： HITACHI LTD
发明人： ARITA HIROSHI , SUZUKI KOUZI , SUGAWARA HIROYUKI , KUROSAWA YUKIO
IPC分类号： B01D59/34 , H01H33/66 , H01J17/56 , H01J21/18 , H01S3/097 , H01T2/00
摘要： A vacuum switch apparatus has an electrically insulating vacuum enclosure (1) which is evacuated to a vacuum degree of 2 x 10 Torr or less. One set of anode (3) and cathode (5) electrodes is arranged in the vacuum enclosure, having capacity which permits the flow of a discharge current of at least 1 KA therebetween and being operable to switch the discharge current at least 10 shots. A high voltage power supply (18, 22) applies a high voltage of at least 20 KV across the anode and cathode electrodes. An electron beam irradiation unit (4, 7, 8) irradiates an electron beam (10) on the anode electrode through the cathode electrode. A control electrode (6) is arranged between the beam irradiation unit and the cathode electrode, for controlling passage and interception of the electron beam. A control voltage power supply (13, 13A, 13B, 13C, 14, 14B) applies a control voltage to the control electrode. An electromagnetic coil (5) is arranged at least exteriorly of the vacuum enclosure, for generating electromagnetic force which prevents the electron beam, emitted from the electron beam irradiation unit and reaching the anode electrode through the control and cathode electrodes, from being scattered.

6. 发明专利

DE68919106D1 未知
公开(公告)号：DE68919106D1
公开(公告)日：1994-12-08
申请号：DE68919106
申请日：1989-03-28
申请人： HITACHI LTD
发明人： SATO MINORI , KASHIMURA KASTUICHI , TSUKUSHI MASANORI , KUROSAWA YUKIO , SAITO KAZUHIRO , KOYANAGI OSAMU , NISHIDA ISAO
IPC分类号： H01H33/16 , H01H33/24 , H02B11/26
摘要： In a circuit breaker in which an interrupting device, a resistor device and a capacitor device (2) are connected in parallel, a shield device is arranged to shield the interrupting device and the resistor device and comprises a first shield (17) for shielding the stationary main contact (5) and stationary resistor contact (22) and a second shield (16) for shielding the movable main contact (7) and movable resistor contact (20). Each of the first shield (17) and the second shield (16) comprises a large shield portion (17A, 16A) and a small shield portion (17B, 16B), and the small shield portions (16B, 17B) are arranged between the large shield portions (16A, 17A). The small shield portion (16B, 17B) terminates in the vicinity of the top of the main contact and of the top of the resistor contact. The small shield portion (16B, 17B) comprises wide portions situated substantially in the direction of an axis joining centers of the main contact and resistor contact and narrow portions situated substantially in the direction perpendicular to the axis. The width of the narrow portions is smaller than the width of the wide portions, and at least a part of the capacitor device (2) is arranged over the narrow portions. In the circuit breaker, since the capacitor device (2) is arranged over the narrow portions, the space for arranging the capacitor device (2) is larger than the conventional circuit breaker, the arrangement of the isoelectric lines is not disturbed or disordered locally in the vicinity of the top of the shield of the stationary main contact (5) and in the vicinity of the movable main contact (7) and high dielectric strength between the main contacts is obtained.

7. 发明专利

CA2002829C THREE-PHASE COMMON CONTAINER-TYPE CIRCUIT BREAKER 未知
公开(公告)号：CA2002829C
公开(公告)日：1994-02-15
申请号：CA2002829
申请日：1989-11-14
申请人： HITACHI LTD
发明人： TSUKUSHI MASANORI , KOYANAGI OSAMU , SEKI YASUHARU , GOTO TOKIO , KUROSAWA YUKIO
IPC分类号： H01H33/915 , H02B13/035 , H01H3/46
摘要： Breaker units for three-phases are enclosed in a common container. The breaker units and conductors connected to the ends of the breaker units are arranged on parallel straight lines that pass approximately through the vertices of an equilateral traingle. A common operational unit for driving the breaker units is accommodated outside the container on one side of the triangle. A zero-phase sequence current transformer surrounds the conductors outside the container.

8. 发明专利

DE3689349D1 未知
公开(公告)号：DE3689349D1
公开(公告)日：1994-01-13
申请号：DE3689349
申请日：1986-09-30
申请人： HITACHI LTD
发明人： OHNO YASUNORI , KUROSAWA TOMOE , SATO TADASHI , KUROSAWA YUKIO , HAKAMATA YOSHIMI
IPC分类号： H01J27/08 , H01J27/14 , H01J27/18 , H01J37/08
摘要： An ion source for producing an ion beam utilized for fabrication and processing of semiconductors, thin films or the like includes a plasma producing chamber (1) equipped with first magnetic means (10a) for limiting a plasma region (20a) and a plasma expansion chamber (2) provided in combination with the plasma producing chamber (1) on the side where a beam extracting electrode (4) is disposed. The plasma expansion chamber (2) is provided with second magnet array (10b) for confining and holding a plasma region (20b) therein which is of a larger area than that of the plasma region (20a) formed in the plasma producing chamber (1).

9. 发明专利

CA2068142A1 GAS ISOLATED DISCONNECTING SWITCH AND GAS ISOLATED SWITCHING DEVICE 未知
公开(公告)号：CA2068142A1
公开(公告)日：1992-11-09
申请号：CA2068142
申请日：1992-05-07
申请人： HITACHI LTD
发明人： OZAWA JUN , ISHIKAWA TOSHIO , KUROSAWA YUKIO
IPC分类号： H01H33/16 , H01H31/32 , H01H33/12 , H01H33/52
摘要： A gas isolated disconnecting switch is provided which performs a sufficient restriking surge suppressing function, induces no adverse effect on the operation of a circuit breaker disposed within the system and always enables the circuit breaker to surely interrupt a fault current. Under the closed condition of the gas isolated disconnecting switch, a main stationary member (6) engages with a main movable member (16) and an auxiliary movable member (17) with an auxiliary stationary member (8) respectively. Accordingly the portion of an auxiliary conductor (7) which passes through a cylindrical magnetic body (9) is short-circuited via the main stationary member (6) and the main movable member (16) no influence is induced on the operation of the circuit breaker disposed in the system. During the opening operation of the disconnecting switch, the auxiliary movable member (17) disengages with a time delay, at this moment, the current flows through the portion of the auxiliary conductor (7) which passes through the cylindrical magnetic body (9) to thereby perform a sufficient restriking surge suppressing function.

10. 发明专利

DE60038945D1 未知
公开(公告)号：DE60038945D1
公开(公告)日：2008-07-03
申请号：DE60038945
申请日：2000-08-10
申请人： HITACHI LTD , HITACHI ELECTRIC SYSTEM CO LTD
发明人： MUNAKATA NORIAKI , KUROSAWA YUKIO , HONDA HARUO , OOUICHI SHIGETOSHI , SHINOHARA MASAKI
IPC分类号： H01H33/66 , H01H33/14 , H01H33/985 , H01H33/16 , H01H33/42 , H01H33/59 , H01H33/666
摘要： An arc generating switching unit 2 which adds an electrical resistance in a circuit during current interruption to attenuate a current to be interrupted, a vacuum bulb 1 which is electrically connected in series with the arc generating switching unit 2 and interrupts the attenuated current and a current conducting switching unit 3 connected in parallel with the series circuit of the vacuum bulb 1 and the arc generating switching unit 2 are provided, and for current conduction the current conducting switching unit 3 is closed after the vacuum bulb 1 and the arc generating switching unit 2 are closed, and for current interruption after opening the current conducting switching unit 3, the vacuum bulb 1 and the arc generating switching unit 2 are opened. Thereby, a small sized power use circuit breaker which performs current conduction and interruption of a large current containing a DC component is obtained.

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