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41. 发明专利

JPH11164426A GAS INSULATION SWITCHING DEVICE 失效
公开(公告)号：JPH11164426A
公开(公告)日：1999-06-18
申请号：JP32757197
申请日：1997-11-28
申请人： HITACHI LTD
发明人： TSUZURA KEIICHI , TAKAHASHI KAZUHIKO , YABUKI MINORU , OKUBO KENICHI , KIDA JUNZO
IPC分类号： H02B13/02 , H02B13/00
摘要： PROBLEM TO BE SOLVED: To attain a small type gas insulation switching device, by putting a first and a second operation devices for switching operation of a disconnect switch connected to a first and a second bus-bars between the first and the second main bus-bar units at a point symmetric position side by side so as to be eccentric from a central line. SOLUTION: An operating shaft 33 for operating a bus-bar side disconnect switch connected to a first main bus-bar 21 is connected with operation devices 31, 32 provided at an outside through a sliding gastight part formed under a first main bus-bar unit 11. The operating shaft 33 for operating a busbar side disconnect switch connected to a second main bus-bar 22 is also connected with the operation devices 31, 32 through the sliding gastight part formed above a second main bus-bar unit 12. The operation devices 31, 32 are stored in a closed container, and are disposed adjacent to each other between the first main bus-bar unit 11 and the second main bus-bar unit 12 by taking a conductive part of straight line as a central axis 100, so as to be eccentric to the central axis 100, and at a point-symmetric position to a point 101.

42. 发明专利

JPH09163595A CONVERTER FOR ULTRAHIGH VOLTAGE SYSTEM 失效
公开(公告)号：JPH09163595A
公开(公告)日：1997-06-20
申请号：JP31382795
申请日：1995-12-01
申请人： HITACHI LTD
发明人： KIDA JUNZO , OZAWA ATSUSHI , MATSUO HISAHIDE , UCHIYAMA TOMOYUKI , YAGINUMA NORIYUKI
IPC分类号： H02H9/04 , H01F30/00 , H02H7/04
摘要： PROBLEM TO BE SOLVED: To provide a transformer which prevents the occurrence of resonant overvoltage caused by surge voltage. SOLUTION: This device is equipped with a breaker for line connected through a bushing 15 to a transmission line 14a, a converter which includes breaker 10 (10a, 10b, and 10c) and a transformer 13a, and a cable 12a which electrically connects the breaker for line and the transformer. The cable 12a has a specified length determined from the wave propagation property of that cable 12a so that the electric waveform having resonant frequency to generate overvoltage inside the transformer 13a may propagate from the transmission line 14a to the transformer 13a through the cable 12a.

43. 发明专利

JPH0974681A POWER FLOW CONTROLLER 失效
公开(公告)号：JPH0974681A
公开(公告)日：1997-03-18
申请号：JP18880195
申请日：1995-07-25
申请人： HITACHI LTD
发明人： KIDA JUNZO , ARITA HIROSHI , KONDO SHINICHI
IPC分类号： H02J3/16 , H02J3/18 , H02J3/20
摘要： PROBLEM TO BE SOLVED: To compensate the reactance state of a power system over a wide range by connecting a first winding having at least one Y-connection in series with a second winding which is combined with the first winding and providing a means which compensates the power transmitting state of the power system. SOLUTION: A power flow controller 10 is constituted of a serial compensator 11 which serially compensates a power system by causing a voltage of a leading phase to a line current, a main transformer 12, which adjusts phases, an adjusting transformer 13 which generates a voltage for adjusting the phase of the voltage generated by the transformer 12, and their control circuit 200. The compensator 11 is arranged between a terminal 14a and a neutral point 14 in each phase of Y-connection windings in the transformer 12. Therefore, the serial reactances of transmission lines, transformers, etc., can be compensated by means of the compensation capacitor of the compensator 11 and the transmission capacity of the power system can be increased and the system can be stabilized by the serial compensation.

44. 发明专利

JPH08148067A CURRENT LIMITING BREAKER DEVICE 失效
公开(公告)号：JPH08148067A
公开(公告)日：1996-06-07
申请号：JP28653294
申请日：1994-11-21
申请人： HITACHI LTD
发明人： ARITA HIROSHI , KIDA JUNZO
IPC分类号： H01H33/59 , H01H9/54 , H02H3/02
摘要： PURPOSE: To break a semiconductor switch by considering breaking capabilty thereof. CONSTITUTION: Semiconductor switches 16, 18 are provided in parallel to a main circuit switch 12, to detect a main circuit current by a current detector 26, and to detect in a current detector 28 a current flowing in the semiconductor switches 16, 18. Based on a detection current in the current detector 26, 28, when detected an accident in an accident detecting circuit 30, opening a circuit is commanded to the main circuit switch 12 from a control circuit 40, also to command closing a circuit to the semiconductor switches 16, 18. Here in a process of opening the main circuit switch 12, when detected abnormality of commutation by a commutation detecting circuit 32, a conduction condition of the semiconductor switches 16, 18 is held, to break the semiconductor 16, 18 only when the commutation is placed in a normal condition. In this way, breaking the semiconductor switches 16, 18, in the point of time exceeding breaking capability, can be prevented.

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