Insulated type switching device

Abstract

In an insulated type switching device, during rotation of a movable conductor 19 around a pivotal axis 35 between a stationary conductor 16 and a ground conductor 17 all of which are disposed in a vacuum vessel 12, the movable conductor 19 uninterruptedly takes four positions of closing position Y 1 , opening position Y 2 , disconnecting position Y 3 and grounding position Y 4 , thereby a series of switching operations can be performed uninterruptedly, the operation and handling thereof are facilitated as well as the size of the insulated type switching device is reduced.

We claim:  
     
       1. An insulated type switching device comprising: 
       a stationary conductor ( 16 ) and a grounding conductor ( 17 ) which are disposed in an opposing relation in a vacuum vessel ( 12 ) and a movable conductor ( 19 ) disposed in said vacuum vessel ( 12 ) between said stationary conductor ( 16 ) and said grounding conductor ( 17 ) so as to permit rotation thereof around a pivotal shaft ( 35 ) therefor to perform opening and closing operations thereof with respect to said stationary conductor ( 16 ) and said grounding conductor ( 17 ) and one end of said movable conductor ( 19 ) is extended out of said vacuum vessel ( 12 ), wherein said movable conductor ( 19 ) takes four positions of closing position Y 1 , opening position Y 2 , disconnecting position Y 3  and grounding position Y 4  uninterruptedly during the movement thereof from said stationary conductor ( 16 ) to said grounding conductor ( 17 ).  
     
     
       2. An insulated type switching device according to claim  1 , characterized in that, said movable conductor ( 19 ) takes three positions of closing position Y 1 , opening position Y 2 , and grounding position Y 4  uninterruptedly during the movement thereof from said stationary conductor ( 16 ) to said grounding conductor ( 17 ). 
     
     
       3. An insulated type switching device comprising: 
       a station  stationary conductor ( 16 ) and a grounding conductor ( 17 ) which are disposed in an opposing relation in a vacuum vessel ( 12 ) and a movable conductor ( 19 ) disposed in said vacuum vessel ( 12 ) between said stationary conductor ( 16 ) and said grounding conductor ( 17 ) so as to permit rotation thereof around a pivotal shaft ( 35 ) therefor to perform opening and closing operations thereof with respect to said stationary conductor ( 16 ) and said grounding conductor ( 17 ) and one end of said movable conductor ( 19 ) is extended out of said vacuum vessel ( 12 ), wherein said movable conductor ( 19 ) takes either four positions of closing position Y 1 , opening position Y 2 , disconnecting position Y 3  and grounding position Y 4  or takes three positions of closing position Y 1 , opening position Y 2 , and grounding position Y 4  uninterruptedly during the movement thereof from said stationary conductor ( 16 ) to said grounding conductor ( 17 ), and further an arc extinguishing arrangement ( 18 ) which extinguishes an arc (A) generated between said stationary conductor ( 16 ) and said movable conductor ( 19 ) is provided on at least one side of said stationary conductor ( 16 ) and said movable conductor ( 19 ), said arc extinguishing arrangement ( 18 ) including a coil electrode ( 18 E) which generates a magnetic field in a vertical direction and a main electrode ( 18 F) which is disposed in facing relation with respect to said coil electrode ( 18 E) and is designed to touch with the arc (A).  
     
     
       4. An insulated type switching device according to claim  3 , wherein said arc extinguishing arrangement ( 18 ) further includes metal attachment member ( 18 B) which is inserted into an attachment groove ( 18 A) formed by cutting into said stationary conductor ( 16 ) from one side thereof, a screw ( 18 C) which is provided at an opposite side of said stationary conductor ( 16 ) so as to fasten and screw said metal attachement member ( 18 B) to said stationary conductor ( 16 ), an inclined portion of said coil electrode ( 18 E) which is secured to said attachment metal member ( 18 B) so that the face of said coil electrode ( 18 E) is directed toward the rotating direction of said movable conductor ( 19 ) from said stationary conductor ( 16 ), through-holes provided for both said coil electrode ( 18 E) and said main electrode ( 18 F) at the center thereof, grooves extending from the outer peripheries of both said coil electrode ( 18 E) and said main electrode ( 18 F) and a connecting portion ( 18 H) connecting said coil electrode ( 18 E) with said main electrode ( 18 F) along said grooves. 
     
     
       5. An insulated type switching device comprising: 
       a stationary conductor ( 16 ) and a grounding conductor ( 17 ) which are disposed in an opposing relation in a vacuum vessel ( 12 ) and a movable conductor ( 19 ) disposed in said vacuum ( 12 ) between said stationary conductor ( 16 ) and said grounding conductor ( 17 ) so as to permit rotation thereof around a pivotal shaft ( 35 ) therefor to perform opening and closing operations thereof with respect to said stationary conductor ( 16 ) and said grounding conductor ( 17 ) and one end of said movable conductor ( 19 ) is extended out of said vacuum vessel  12 , wherein said movable conductor ( 19 ) takes either four positions of closing position Y 1 , opening position Y 2 , disconnecting position Y 3  and grounding position Y 4  or takes three positions of closing position Y 1 , opening position Y 2 , and grounding position Y 4  uninterruptedly during the movement thereof from said stationary conductor ( 16 ) to said grounding conductor ( 17 ), and further an arc extinguishing arrangement ( 102 ) which extinguishes an arc (A) generated between said stationary conductor ( 16 ) and said movable conductor ( 19 ) is provided at least at one side of said stationary conductor ( 16 ) and said movable conductor ( 19 ), said arc extinguishing arrangement ( 102 ) including a portion having projections and recesses ( 103 ) in said vacuum vessel ( 12 ) at the opposite side from the side where the one end of said movable conductor ( 19 ) is extended out from said vacuum vessel ( 12 ) and a pair of arc horns ( 100 ) and ( 101 ) provided at both end portions of said portions having projections and recesses ( 103 ).  
     
     
       6. An insulated type switching device comprising: 
       a stationary conductor ( 16 ) and a grounding conductor ( 17 ) which are disposed in an opposing relation in a vacuum vessel ( 12 ) and a movable conductor ( 19 ) disposed in said vacuum vessel ( 12 ) between said stationary conductor ( 16 ) and said grounding conductor ( 17 ) so as to permit rotation thereof around a pivotal shaft ( 35 ) therefor to perform opening and closing operations thereof with respect to said stationary conductor ( 16 ) and said grounding conductor ( 17 ) and one end of said movable conductor ( 19 ) is extended out of said vacuum vessel ( 12 ), wherein said movable conductor ( 19 ) takes either four positions of closing position Y 1 , opening position Y 2 , disconnecting position Y 3  and grounding position Y 4  or takes three positions of closing position Y 1 , opening position Y 2 , and grounding position Y 4  uninterruptedly during the movement thereof from said stationary conductor ( 16 ) to said grounding conductor ( 17 ), and further an arc extinguishing arrangement ( 18 ) which extinguishes an arc (A) generated between said stationary conductor ( 16 ) and said movable conductor ( 19 ) is provided at least at one side of said stationary conductor ( 16 ) and said movable conductor ( 19 ), said arc extinguishing arrangement ( 18 ) including a stationary contact electrode ( 16 ) with an arc guiding groove ( 18 S) carried by said stationary conductor ( 16 ) and a movable contact electrode ( 19 A) with an arc guiding groove ( 18 S) carried by said movable conductor ( 19 ), whereby when said movable conductor ( 19 ) is separated from said stationary conductor ( 16 ) through rotation of said movable conductor ( 19 ) around said pivotal shaft ( 35 ), the separating distance between said stationary contact electrode ( 16 A) and the movable contact electrode ( 19 A) at an outer circumference thereof exceeds that between said stationary contact electrode ( 16 A) and the movable contact electrode ( 19 A) at the outer circumference thereof exceeds that between said stationary contact electrode ( 16 A) and said movable electrode ( 19 A)  at the inner circumference thereof and the arc the  at the outer circumference on said stationary and movable contact electrodes ( 16 A) and ( 19 A) is forced toward the inner circumference thereof.  
     
     
       7. An insulated type switching device comprising: 
       a stationary conductor ( 16 ) which is disposed in a vacuum vessel ( 12 ) and a movable conductor ( 19 ) disposed in said vacuum vessel ( 12 ) so as to permit rotation thereof around a pivotal shaft ( 35 ) therefor to perform opening and closing operations thereof with respect to said stationary conductor ( 16 ) and one end of said movable conductor ( 19 ) is extended out of said vacuum vessel ( 12 ), wherein an opposing electromagnetic force generating means ( 41 B) is provided on at least one side of said stationary conductor ( 16 ) and said movable conductor ( 19 ) which cancels out an electromagnetic force generated at said movable conductor ( 19 ).  
     
     
       8. An insulated type switching device according to claim  7 , wherein said opposing electromagnetic force generating means ( 41 B) is an electromagnetic force adjusting conductor provided in a load side conductor ( 41 A) connected to said movable conductor ( 19 ) and extended in the same direction as that of said movable conductor ( 19 ). 
     
     
       9. An insulated type switching device comprising: 
       a stationary conductor ( 16 ) which is disposed in a vacuum vessel ( 12 ) and a movable conductor ( 19 ) disposed in said vacuum vessel ( 12 ) to perform the  opening and closing operations thereof with respect to said stationary conductor ( 16 ) wherein said  an opposing electromagnetic force generating means ( 41 B) is an electromagnetic force adjusting means provided in a load side conductor ( 41 A) connected to said movable conductor ( 19 ) and cancels out an electromagnetic force generated at said movable conductor ( 19 ), and further an arc extinguishing arrangement ( 18 ) which extinguishes an arc (A) generated between said stationary conductor ( 16 ) and said movable conductor ( 18 ) is provided on at least one side of said stationary conductor ( 19 ) and said movable conductor ( 19 ), said arc extinguishing arrangement ( 18 ) including a stationary contact electrode ( 16 A) with an arc guiding groove ( 18 S) carried by said stationary conductor ( 16 ) and a movable contact electrode ( 19 A) with an arc guiding groove ( 18 S) carried by said movable conductor ( 19 ), whereby when said movable conductor ( 19 ) is separated from said stationary conductor ( 16 ) through rotation of said movable conductor ( 19 ) around said pivotal shaft ( 35 ), the separating distance between said stationary contact electrode ( 16 A) and the movable contact electrode ( 19 A) at the  an outer circumference thereof exceeds that between said stationary contact electrode ( 16 A) and said movable contact electrode ( 19 A) at the  an inner circumference thereof and the arc at the outer circumference on said stationary and movable contact electrodes ( 16 A) and ( 19 A) is forced toward the inner circumference thereof.  
     
     
       10. An insulated type switching device comprising a plurality of vacuum switches each including a stationary conductor ( 16 ) and a grounding conductor ( 17 ) which are disposed in an opposing relation to a vacuum vessel ( 12 ) and a movable conductor ( 19 ) disposed in said vacuum vessel ( 12 ) between said stationary conductor ( 16 ) and said grounding conductor ( 17 ) so as to permit rotation thereof around a pivotal shaft ( 35 ) therefor to perform opening and closing operations thereof with respect to said stationary conductor ( 16 ) and said grounding conductor ( 17 ) and one end of said movable conductor ( 19 ) is extended out of said vacuum vessel ( 12 ), wherein said plurality of the vacuum switches are arranged in parallel so that said outwardly extending movable conductors ( 19 ) are aligned in parallel at the same side of the respective vacuum switches. 
     
     
       11. An insulated type switching device comprising a stationary conductor ( 16 ) and a grounding conductor ( 17 ), first ends of which are disposed in an opposing relation in a vacuum vessel ( 12 ), the other ends of which are extended out of said vacuum vessel ( 12 ), and a movable conductor ( 19 ) disposed in said vacuum vessel ( 12 ) between said stationary conductor ( 16 ) and said grounding conductor ( 17 ) so as to permit rotation thereof around a pivotal shaft ( 35 ) therefor to perform the opening and closing operations thereof with respect to said stationary conductor ( 16 ) and said grounding conductor ( 17 ) and one end of said movable conductor ( 19 ) is extended out of said vacuum vessel ( 12 ), wherein the other end of said grounding conductor ( 17 ) is bent in an opposite direction from said movable conductor ( 19 ) to form an external grounding terminal ( 32 ). 
     
     
       12. An insulated type switching device comprising: 
       
         a stationary conductor and a grounding conductor which are disposed in an operational relation in a vacuum vessel and a movable conductor disposed in said vacuum vessel between said stationary conductor and said grounding conductor so as to permit movement thereof around a pivotal shaft therefor to perform opening and closing operations thereof with respect to said stationary conductor and said grounding conductor, and one end of said movable conductor is extended out of said vacuum vessel, wherein said movable conductor takes four positions of closing position Y 
         1 
         , opening position Y 
         2 
         , disconnecting position Y 
         3  
         and grounding position Y 
         4  
         during the movement thereof from said stationary conductor to said grounding conductor. 
       
     
     
       13. An insulated type switching device comprising: 
       
         a stationary conductor and a grounding conductor, which are disposed in an operational relation in a vacuum vessel and a movable conductor disposed in said vacuum vessel between said stationary conductor and said grounding conductor so as to permit movement thereof around a pivotal shaft to perform opening and closing operations thereof with respect to said stationary conductor and said grounding conductor, and one end of said movable conductor being extended out of said vacuum vessel, wherein said movable conductor takes three positions of closing position Y 
         1 
         , opening position Y 
         2 
         , and grounding position Y 
         4  
         during the movement thereof from said stationary conductor to said grounding conductor. 
       
     
     
       14. An insulated type switching device, comprising: 
         a stationary conductor and a grounding conductor which are disposed in an opposing relation in a vacuum vessel and a movable conductor disposed in said vacuum vessel between said stationary conductor and said grounding conductor so as to permit movement thereof around a pivotal shaft therefor to perform opening and closing operations thereof with respect to said stationary conductor and said grounding conductor and one end of said movable conductor is extended out of said vacuum vessel, wherein said movable conductor takes either four positions of closing position Y   1   , opening position Y   2   , disconnecting position Y   3    and grounding position Y   4    or takes three positions of closing position Y   1   , opening position Y   2   , and grounding position Y   4    during the movement thereof from said stationary conductor to said grounding conductor, and further an arc extinguishing arrangement which extinguishes an arc  ( A )  generated between said stationary conductor and said movable conductor is provided on at least one side of said stationary conductor and said movable conductor, said arc extinguishing arrangement including a coil electrode which generates a magnetic field in a vertical direction and a main electrode which is disposed in facing relation with respect to said coil electrode and is designed to touch with the arc  ( A ). 
     
     
       15. An insulated type switching device according to claim  14 , wherein said arc extinguishing arrangement further includes metal attachment member which is inserted into an attachment groove formed by cutting into said stationary conductor from one side thereof, a screw which is provided at an opposite side of said stationary conductor so as to fasten and screw said metal attachment ember to said stationary conductor, an included portion of said coil electrode which is secured to said attachment metal member so that the face of said coil electrode is directed toward the rotating direction of said movable conductor from said stationary conductor, through- holes provided for both said coil electrode and said main electrode at the center thereof, grooves extending from the outer peripheries of both said coil electrode and said main electrode and a connecting portion connecting said coil electrode with said main electrode along said grooves.   
     
     
       16. An insulated type switching device comprising: 
         a stationary conductor and a grounding conductor which are disposed in an opposing relation in a vacuum vessel and a movable conductor disposed in said vacuum vessel between said stationary conductor and said grounding conductor so as to permit movement thereof around a pivotal shaft therefor to perform opening and closing operations thereof with respect to said stationary conductor and said grounding conductor, and one end of said movable conductor is extended out of said vacuum vessel, wherein said movable conductor takes either four positions of closing position Y   1   , opening position Y   2   , disconnecting position Y   3    and grounding position Y   4    or takes three positions of closing position Y   1   , opening position Y   2   , and grounding position Y   4    during the movement thereof from said stationary conductor to said grounding conductor, and further an arc extinguishing arrangement which extinguishes an arc  ( A )  generated between said stationary conductor and said movable conductor is provided at least at one side of said stationary conductor and said movable conductor, said arc extinguishing arrangement including a portion having projections and recesses in said vacuum vessel at the opposite side from the side where the one end of said movable conductor is extended out from said vacuum vessel and a pair of arc horns and provided at both end portions of said portion having projections and recesses.   
     
     
       17. An insulated type switching device comprising: 
         a stationary conductor and a grounding conductor which are disposed in an opposing relation in a vacuum vessel and a movable conductor disposed in said vacuum vessel between said stationary conductor and said grounding conductor so as to permit movement thereof around a pivotal shaft therefor to perform opening and closing operations thereof with respect to said stationary conductor and said grounding conductor and one end of said movable conductor is extended out of said vacuum vessel, wherein said movable conductor takes either four positions of closing position Y   1   , opening position Y   2   , disconnecting position Y   3    and grounding position Y   4    or takes three positions of closing position Y   1   , opening position Y   2   , and grounding position Y   4    during the movement thereof from said stationary conductor to said grounding conductor, and further an arc extinguishing arrangement which extinguishes an arc  ( A )  generated between said stationary conductor and said movable conductor is provided at least at one side of said stationary conductor and said movable conductor, said arc extinguishing arrangement including a stationary contact electrode with an arc guiding groove carried by said stationary conductor and a movable contact electrode with an arc guiding groove carried by said movable conductor, whereby when said movable conductor is separated from said stationary conductor through rotation of said movable conductor around said pivotal shaft, the separating distance between said stationary contact electrode and the movable contact electrode at an outer circumference thereof exceeds that between said stationary contact electrode and the movable contact electrode at the inner circumference thereof and the arc at the outer circumference on said stationary and movable contact electrodes is forced toward the inner circumference thereof.   
     
     
       18. An insulated type switching device comprising: 
       
         a stationary conductor which is disposed in a vacuum vessel and a movable conductor disposed in said vacuum vessel so as to permit movement thereof around a pivotal shaft therefor to perform opening and closing operations thereof with respect to said stationary conductor and one end of said movable conductor is extended out of said vacuum vessel, wherein an opposing electromagnetic force generating means is provided on at least one side of said stationary conductor and said movable conductor which cancels out an electromagnetic force generated at said movable conductor. 
       
     
     
       19. An insulated type switching device according to claim  18 , wherein said opposing electromagnetic force generating means is an electromagnetic force adjusting conductor provided in a load side conductor connected to said movable conductor and extended in the same direction as that of said movable conductor. 
     
     
       20. An insulated type switching device comprising: 
         a stationary conductor which is disposed in a vacuum vessel and a movable conductor disposed in said vacuum vessel to perform opening and closing operations thereof with respect to said stationary conductor wherein an opposing electromagnetic force generating means is an electromagnetic force adjusting means provided in a load side conductor connected to said movable conductor and cancels out an electromagnetic force generated at said movable conductor, and further an arc extinguishing arrangement which extinguishes an arc  ( A )  generated between said stationary conductor and said movable conductor is provided on at least one side of said stationary conductor and said movable conductor, said arc extinguishing arrangement including a stationary contact electrode with an arc guiding groove carried by said stationary conductor and a movable contact electrode with an arc guiding groove carried by said movable conductor, whereby when said movable conductor is separated from said stationary conductor through movement of said movable conductor around said pivotal shaft, the separating distance between said stationary contact electrode and the movable contact electrode at an outer circumference thereof exceeds that between said stationary contact electrode and said movable contact electrode at an inner circumference thereof and the arc at the outer circumference on said stationary and movable contact electrodes is forced toward the inner circumference thereof.   
     
     
       21. An insulated type switching device comprising a plurality of vacuum switches each including a stationary conductor and a grounding conductor which are disposed in an operational relation in a vacuum vessel and a movable conductor disposed in said vacuum vessel between said stationary conductor and said grounding conductor so as to permit movement thereof around a pivotal shaft therefor to perform opening and closing operations thereof with respect to said stationary conductor and said grounding conductor and one end of said movable conductor is extended out of said vacuum vessel, wherein said plurality of the vacuum switches are arranged in parallel so that said outwardly extending movable conductors are aligned in parallel at the same side of the respective vacuum switches. 
     
     
       22. An insulated type switching device comprising a stationary conductor and a grounding conductor, first ends of which are disposed in an operational relation in a vacuum vessel, the other ends of which are extended out of said vacuum vessel, and a movable conductor disposed in said vacuum vessel between said stationary conductor and said grounding conductor so as to permit movement thereof around a pivotal shaft therefor to perform the opening and closing operations thereof with respect to said stationary conductor and said grounding conductor and one end of said movable conductor is extended out of said vacuum vessel, wherein the other end of said grounding conductor is bent in an opposite direction from said movable conductor to form an external grounding terminal. 
     
     
       23. An insulated type switching device comprising: 
       
         a vacuum vessel;  
       
       
         a stationary conductor, disposed in the vacuum vessel;  
       
       
         a grounding conductor, disposed in the vacuum vessel; and  
       
       
         a movable conductor, disposed in the vacuum vessel, one end of which moves between the stationary conductor and the grounding conductor, when an operating mechanism coupled to the other end of the movable conductor operates the movable conductor;  
       
       
         wherein the operating mechanism is designed to move the movable conductor so as to take at least three of four positions Y 
         1 
         , Y 
         2 
         , Y 
         3  
         and Y 
         4  
         between the stationary conductor and the grounding conductor, wherein Y 
         1  
         is a position making contact between the stationary conductor and the one end of the movable conductor, Y 
         2  
         is a position making a separation between the stationary conductor and the one end of the movable conductor thereby to extinguish an arc generated between the stationary conductor and the movable conductor, Y 
         3  
         is a position making a disconnection between the stationary conductor and the movable conductor thereby to maintain a dielectric distance therebetween, and Y 
         4  
         is a position making contact between the one end of the movable conductor and the grounding conductor. 
       
     
     
       24. A vacuum switching device comprising: 
       
         a vacuum vessel;  
       
       
         a stationary conductor, disposed in the vacuum vessel;  
       
       
         a grounding conductor, disposed in the vacuum vessel; and  
       
       
         a movable conductor, disposed in the vacuum vessel, one end of which moves between the stationary conductor and the grounding conductor, when an operating mechanism coupled to the other end of the movable conductor operates the movable conductor, the other end of the movable conductor being extended outside of the vacuum vessel;  
       
       
         wherein the operating mechanism is designed to move the movable conductor so as to take at least three of four positions Y 
         1 
         , Y 
         2 
         , Y 
         3  
         and Y 
         4  
         between the conductors, where Y 
         1  
         is a position making contact between the stationary conductor and the one end of the movable conductor, Y 
         2  
         is a position making a separation between the stationary conductor and the one end of the movable conductor, Y 
         3  
         is a position making a disconnection between the stationary conductor and the movable conductor thereby to maintain a dielectric distance therebetween, and Y 
         4  
         is a position making contact between the one end of the movable conductor and the grounding conductor. 
       
     
     
       25. An insulated type switching device comprising: 
       
         an insulation container confining an insulating gas therein; and a vacuum vessel wherein a stationary conductor; a grounding conductor; and a movable conductor, one end of which moves between the stationary conductor and the grounding conductor when an operating mechanism coupled to the other end of the movable conductor operates the movable conductor, are disposed;  
       
       
         and wherein the operating mechanism moves the movable conductor so as to take at least three of four positions Y 
         1 
         , Y 
         2 
         , Y 
         3  
         and Y 
         4  
         between the stationary conductor and the grounding conductor, wherein Y 
         1  
         is a position making contact between the stationary conductor and the one end of the movable conductor, Y 
         2  
         is a position making a separation between the stationary conductor and the one end of the movable conductor thereby to extinguish an arc generated between the conductors, Y 
         3  
         is a position making a disconnection between the stationary conductor and the movable conductor thereby to maintain a dielectric distance therebetween, and Y 
         4  
         is a position making contact between the one end of the movable conductor and the grounding conductor. 
       
     
     
       26. A switching device, which comprises: 
       
         an insulation container confining an insulation gas therein for receiving a plurality of switching devices, each comprising a vacuum vessel wherein a stationary conductor; a grounding conductor; and a movable conductor, one end of which moves between the stationary conductor and the grounding conductor, when an operating mechanism coupled to the other end of the movable conductor operates the movable conductor, are disposed;  
       
       
         and wherein the operating mechanism moves the movable conductor so as to take four positions Y 
         1 
         , Y 
         2 
         , Y 
         3  
         and Y 
         4  
         between the stationary conductor and the grounding conductor, wherein Y 
         1  
         makes contact between the stationary conductor and the one end of the movable conductor, Y 
         2  
         makes a separation between the stationary conductor and the one end of the movable conductor thereby to extinguish an arc generated between the stationary conductor and the movable conductor, Y 
         3  
         makes a disconnection between the stationary conductor and the movable conductor thereby to maintain a dielectric distance therebetween, and Y 
         4  
         makes contact between the one end of the movable conductor and the grounding conductor. 
       
     
     
       27. An insulated type switching device, which comprises: 
       
         an insulation container confining an insulation gas therein; and a plurality of switching devices received in the insulation container, each comprising a vacuum vessel wherein a stationary conductor; a grounding conductor; and a movable conductor, one end of which moves between the stationary conductor and the grounding conductor, when an operating mechanism coupled to the other end of the movable conductor operates the movable conductor, are disposed; and  
       
       
         wherein the operating mechanism is designed to actuate the movable conductor so as to take four positions Y 
         1 
         , Y 
         2 
         , Y 
         3  
         and Y 
         4  
         between the stationary conductor and the grounding conductor, wherein Y 
         1  
         makes contact between the stationary conductor and the one end of the movable conductor, Y 
         2  
         makes a separation between the stationary conductor and the one end of the movable conductors, Y 
         3  
         makes a disconnection between the stationary conductor and the movable conductor thereby to maintain a dielectric distance therebetween, and Y 
         4  
         makes contact between the one end of the movable conductor and the grounding conductor. 
       
     
     
       28. An insulated type switching device comprising: 
       
         a vacuum vessel;  
       
       
         a stationary conductor disposed in the vacuum vessel;  
       
       
         a grounding conductor, disposed in the vacuum vessel;  
       
       
         a movable conductor, disposed in the vacuum vessel, one end of which moves between the stationary conductor and the grounding conductor, when an operating mechanism coupled to the other end of the movable conductor operates the movable conductor; and  
       
       
         wherein the operating mechanism is designed to actuate the other end of the movable conductor so as to take at least three positions Y 
         1 
         , Y 
         2 
         , and Y 
         4  
         between the conductors, where Y 
         1  
         makes contact between the stationary conductor and the one end of the movable conductor, Y 
         2  
         makes a separation between the stationary conductor and the one end of the movable conductor thereby to extinguish an arc generated between the stationary conductor and the movable conductor, and Y 
         4  
         makes contact between the one end of the movable conductor and the grounding conductor. 
       
     
     
       29. An insulated type switching device, which comprises: 
       
         an insulation container confining an insulating gas therein; and a plurality of switching devices received in the insulation container, each comprising a vacuum vessel wherein a stationary conductor; a grounding conductor; and a movable conductor, one end of which moves between the stationary conductor and the grounding conductor, when an operating mechanism coupled to the other end of the movable conductor operates the movable conductor, are disposed; and  
       
       
         wherein the operating mechanism is designed to actuate the movable conductor so as to take at least three positions Y 
         1 
         , Y 
         2 
         , and Y 
         4  
         between the stationary conductor and the grounding conductor, wherein Y 
         1  
         makes contact between the stationary conductor and the one end of the movable conductor, Y 
         2  
         makes a separation between the stationary conductor and the one end of the movable conductor, and Y 
         4  
         makes contact between the one end of the movable conductor and the grounding conductor.