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1. 发明专利

JPH03276527A DC BREAKER 失效
公开(公告)号：JPH03276527A
公开(公告)日：1991-12-06
申请号：JP7539190
申请日：1990-03-27
申请人： HITACHI LTD
发明人： OUCHI SHIGETOSHI , SHIROMIZU TATSUJI , OIDE SHINICHI
IPC分类号： H01H33/59
摘要： PURPOSE:To improve current breaking performance with a current rate of change of breaking current restrained with simple constitution by surroundedly providing a magnetic substance, saturated with a given current larger than rated current, on a main circuit to which a main contact is connected. CONSTITUTION:A magnetic substance 20, which is on a disc and composed by laminating thin iron plates, is surroundedly provided on the outer periphery of a conductor 11 in a vacuum vessel consisting of an insulating tube 12, fixed side plate 13, and movable side plate 14, etc., and also is supported and fixed in the inner surface of the insulating tube 12. In the same way, a disc-like magnetic substance 21, composed by laminating thin iron plates, is surroundedly provided on the outer periphery of a conductor 17 in the vacuum vessel, and also is supported and fixed in the inner surface of the insulating tube 12. Moreover both the magnetic substances 20 and 21 have constitution in which they are saturated at a given current value larger than rated current. By this, when short-circuit current exceeding rated current flows in a main contact 1, the magnetic substances 20 and 21 are saturated to restrain the rate of change of current flowing in the main contact 1, therefore current breaking is eased, and a DC breaker having simple constitution as a whole is obtained.

2. 发明专利

JPH03110729A TRIGGER DISCHARGE DEVICE 失效
公开(公告)号：JPH03110729A
公开(公告)日：1991-05-10
申请号：JP24870989
申请日：1989-09-25
申请人： HITACHI LTD
发明人： OUCHI SHIGETOSHI , SHIROMIZU TATSUJI , OIDE SHINICHI
IPC分类号： H01H33/66
摘要： PURPOSE:To obtain a trigger discharge device suitable for big current and high voltage by storing electrode portions in a vacuum, and mechanically bringing a fixed electrode and a movable electrode into contact with each other and separating them from each other so as to trigger the gap between both electrodes. CONSTITUTION:When a magnetic field is generated by excitation of an electromagnetic repulsive coil 14 in response to output from a control circuit 13 a current is induced in a short ring 11 and an electromagnetic repulsive force is generated between the electromagnetic repulsive coil 14 and the short ring 11 and the short ring 11 is driven upwards at high speed so that a movable electrode 8 is closed at high speed. When the output of the control circuit 13 is stopped the movable electrode 8 is lowered and an arc is generated between the movable electrode 8 and a fixed electrode 7 and the gap between the fixed electrode 7 and the movable electrode 8 is triggered and a current is caused to flow between both electrodes 7, 8 between which the gap is being retained by an opening spring 12. Thus a trigger discharge device that performs stable triggering for big current and high voltage is obtained.

3. 发明专利

JPH0392439A DC FEEDER CIRCUIT SYSTEM 失效
公开(公告)号：JPH0392439A
公开(公告)日：1991-04-17
申请号：JP22917989
申请日：1989-09-06
申请人： HITACHI LTD
发明人： OUCHI SHIGETOSHI , SHIROMIZU TATSUJI , OIDE SHINICHI , ICHINOSE TAKASHI , KANNO TSUTOMU
IPC分类号： B60M3/06 , H01H33/59 , H02J1/00
摘要： PURPOSE:To lessen an energy absorbing device in number by connecting No.1 diode which sends electric current to the direction of the energy absorbing device, between each of the other ends of respective DC breakers and one end of the energy absorbing device, and thereby connecting a diode which sends electric current to the direction of a common conductor, between the other end of the energy absorbing device and the common conductor. CONSTITUTION:If short circuit failures occur at one end sides of DC breakers 10A through 10C, short circuited current flows to an energy absorbing device 6 through DC breakers and No.1 diodes 12A through 12C so that a circuit is thereby formed, through which the discharge current of the energy absorbing device 6 flows into a common conductor 1 through a diode 14. By this constitution, it is good enough that one energy absorbing device which is common to a plurality of the DC breakers, is installed, and a DC feeder circuit can thereby be made small in size while manufacturing cost can be lowered.

4. 发明专利

JPH0737471A COMMUTATION TYPE D.C. CIRCUIT BREAKER 失效
公开(公告)号：JPH0737471A
公开(公告)日：1995-02-07
申请号：JP18496693
申请日：1993-07-27
申请人： HITACHI LTD
发明人： YOSHIDA TORU , HONDA HARUO , OUCHI SHIGETOSHI , OIDE SHINICHI
IPC分类号： H01H33/59
摘要： PURPOSE:To provide a commutation type d.c. circuit breaker, by which matching of the action timing between a main contact point and an instantaneous contact switch is facilitated, and which has a stable circuit breaking performance. CONSTITUTION:An electromagnetic repulsion coil 5 is provided in the vicinity of a short ring 7 connected to the moving electrode 1B of a main contact 1. The electromagnetic repulsion coil 5 is connected to a commutation circuit 6, and the electromagnetic repulsion coil 5 is magnetized by the discharge current I2 of a capacitor 4 run by closing the instantaneous switch 3 of the commutation circuit 6, to provide operation force for closing the main contact 1. The discharge current I2 running reverse to a main circuit current I1 is fed to the main contact point 1, to form a current zero point on the main circuit current I1.

5. 发明专利

JPH05234471A 失效
公开(公告)号：JPH05234471A
公开(公告)日：1993-09-10
申请号：JP3505892
申请日：1992-02-21
申请人： HITACHI LTD
发明人： OIDE SHINICHI , OUCHI SHIGETOSHI , HONDA HARUO , YOSHIDA SUSUMU , SUGANO TSUTOMU , KUGO YUKIO
IPC分类号： H01H33/59
摘要： PURPOSE:To enhance the load side safety in no-load circuit opening. CONSTITUTION:A main contact 1 is connected between a DC power supply 11 and a load 12, and a commutator circuit in which a capacitor 2, a reactor 3, and a commutator switch 4 are electrically connected in series, and an energy absorbing device 5 are electrically connected in parallel with the main contact 1, and further a blocking means 7 for blocking the flow of the commutator current from the commutator circuit to the load 12 in no-load circuit opening is provided. The blocking means 7 is provided at the location nearer to the load 12 than an electrical connection point between the main contact 1 and the commutator circuit, while it opens approximately at the same time as the circuit opening of the main contact 1 or prior to the circuit opening of the commutator switch 4.

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