Abstract:
In a conventional gas insulated switchgear device, when transposing bus line phases, a separate unit which extends bus lines is provided and the bus line phase transposition was performed with the extension unit. However, because of the use of such extension unit, a bay interval in the gas insulated switchgear device is elongated and the installation area thereof is enlarged.  
     In the present invention, a phase transposing unit for bus line conductors is provided in a bus line tank disposed within the conventional bay interval without providing the separate bus line extending unit.  
     Thereby, a structure for transposing bus line phases without using the extension unit while keeping the installation area of the conventional gas insulated switchgear device unchanged.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention  
           [0002]    The present invention relates to a bus line conductor and a gas insulated switchgear device using the same, and more specifically relates to a bus line conductor which is suitable to be formed by accommodating three phase bus line conductors inclusively in a tank filled with insulation gas having high arc quenching property such as SF 6  gas and a gas insulated switchgear device using the same.  
           [0003]    2. Conventional Art  
           [0004]    Conventionally, a gas insulated switchgear device (hereinbelow will be referred to as GIS) provided with a bus line container (tank) is, for example, arranged between a three phase high voltage source and an atmospheric power transmission line in a substation, functions to interrupt current when detecting an abnormal voltage such as by a lightning surge, and is roughly constituted by a bushing for receiving power from the three phase high voltage source and the gas insulated bus line container accommodating three phase inclusive bus line conductors for power distributing from the bushing to a gas insulated circuit breaker (hereinbelow will be referred to as GCB).  
           [0005]    In the above referred to conventional art, such as when wiring conductors from the bushing into the bus line container and when wiring conductors from the bus line container to the GCB, since the three phase bus lines in the adjacent bus line containers are arranged differently, it requires an idea to connect these conductors.  
           [0006]    In the conventional GIS, for example, as disclosed in JP-A-11-69581 (1999), the above problem was countermeasured by such a manner that a separate phase transposing unit is provided between bus line containers in which respective three phase inclusive bus line conductors are accommodated, the phases of the bus lines are transposed in the separate phase transposing unit and are connected there each other.  
           [0007]    However, with the above countermeasure, when transposing the phases in the adjacent bus line containers, since the bus line phases are transposed through provision of the separate transposing unit, a total length of the GIS is prolonged which resultantly increases an entire area of the GIS and an installation area therefor.  
         SUMMARY OF THE INVENTION  
         [0008]    An object of the present invention is to provide a compact bus line conductor container and a gas insulated switchgear device using the same which, even if three phase inclusive bus line conductors within adjacent bus line conductor containers are arranged differently, prevents to prolong the total length of the device as well as prevents to increase an entire area therefor beyond its necessity, and resultantly prevents to result in an installation area enlargement.  
           [0009]    In order to achieve the above object, the bus line conductor container according to the present invention is characterized by being constituted as defined in claims 1, 5, 6 and 10, and the gas insulated switchgear device according to the present invention is characterized by being constituted as defined in claims 11, 12, 13 and 14. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0010]    [0010]FIG. 1 is a top plane view of a gas insulated switchgear device representing an embodiment of the present invention;  
         [0011]    [0011]FIG. 2 is a side view of the gas insulated switchgear device representing the embodiment of the present invention;  
         [0012]    [0012]FIG. 3 is another side view of the gas insulated switchgear device representing the embodiment of the present invention;  
         [0013]    [0013]FIG. 4 is a cross sectional view of bus line conductor containers in the gas insulated switchgear device representing the embodiment of the present invention;  
         [0014]    [0014]FIG. 5 is a cross sectional view of a bus line conductor container in the gas insulated switchgear device representing the embodiment of the present invention;  
         [0015]    [0015]FIG. 6 is another cross sectional view of a bus line conductor container in the gas insulated switchgear device representing the embodiment of the present invention; and  
         [0016]    [0016]FIG. 7 is still another cross sectional view of a bus line conductor container in the gas insulated switchgear device representing the embodiment of the present invention. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0017]    Hereinbelow, an embodiment of the present invention will be explained with reference to the drawings.  
         [0018]    [0018]FIGS. 1 through 3 show an embodiment of a GIS of the present invention.  
         [0019]    As shown in the drawings, the GIS of the present embodiment is provided with a main bus line conductor containers  102 ,  202  and  302  in which first three phase inclusive bus line conductors are accommodated, and another main bus line conductor containers  100 ,  200  and  300  in which second three phase inclusive bus line conductors are accommodated, and in these containers SF 6  gas is filled in a sealed manner so as to ensure insulation.  
         [0020]    The respective phase bus line conductors in the first and second three phase inclusive bus lines are constituted to be connected to corresponding circuit breaker units respectively provided for No.1 bay, No.2 bay and No.3 bay which will be explained later. The respective phase bus line conductors in the first and second three phase inclusive bus lines constitute together with the circuit breaker units No.1 through No.3 bay units for every bay of No.1 through No.3.  
         [0021]    No.1 bay unit is constituted by first through third bus line conductors accommodated in the main bus line container  102  and first through third bus line conductors accommodated in the main bus line container  100 , and these bus line conductors are connected to cable heads for every phase via the gas circuit breakers accommodated in the respective circuit breaker unit  611 ,  612  and  613  so as to permit opening and closing thereof.  
         [0022]    Further, in the like manner, in No.2 bay unit, the first through third three phase bus line conductors accommodated in the first main bus line container  202  are connected to the first through third three phase bus line conductors accommodated in the second main bus line container  200  via the circuit breaker units  631 ,  632  and  633  so as to permits opening and closing thereof.  
         [0023]    Still further, in the like manner, in No.3 bay unit, the respective first through third three phase bus line conductors accommodated in the first and second main bus line containers  302  and  300  are connected to cable heads for every phases via gas circuit breakers accommodated in the circuit breaker units  641 ,  642  and  643  so as to permit opening and closing thereof.  
         [0024]    The main bus line containers  100  and  102  provided for the first bay and accommodating the first and second three phase inclusive bus line conductors can be connected, if required, to another bay unit not shown at the opposite side from one where the second bay unit is connected, further, in the same way, the main bus line containers  300  and  302  provided for the third bay unit and accommodating the first and second three phase inclusive bus line conductors can be connected to another bay unit not shown at the opposite side from one where the second bay unit is connected so as to constitute a GIS.  
         [0025]    [0025]FIG. 2 shows a cross sectional view taken along line A-A′ of the first bay unit in FIG. 1 which is seen in the horizontal direction from the installation plane of the device and shows a structure of a circuit breaker unit for one phase filled with SF 6  gas. The present bay unit is constituted to connect the first or second three phase inclusive bus line conductors to the respective cable heads via the gas circuit breakers accommodated in the circuit breaker units  611 ,  612  and  613 .  
         [0026]    In the first bay unit, the circuit breaker unit  611  is disposed at the bottom side thereof in horizontal direction and an operating unit  106  for driving a movable conductor in the circuit breaking unit  611  is arranged at the right side of the circuit  611 . Above the circuit breaking unit  611  a current transformer unit  108  and a bus line connecting conductor  112  are disposed. The bus line connecting conductor  112  and a conductor connected to the circuit breaker unit  611  are electrically connected via a tulip shaped contact. The bus line connecting conductor  112  is formed in a cross shape and the right and left side thereof are supported and secured by insulator spacers  110   a  and  110   b.  Above the bus line connecting conductor  112  a grounding device  114  is connected via a flange. At the respective opposite sides of the insulator spacers  110   a  and  110   b  supporting and securing the bus line connecting conductor  112  main bus line disconnecting switch units  652  and  662  are disposed. Detachable supporting posts  110  and  112  are respectively provided between the main bus line containers  100  and  102  and the installation plane and are permitted to support the main bus line containers  100  and  102  and the main bus line disconnecting switch units  652  and  662 , when disassembling the circuit breaker unit  611  at the time of an accident thereof.  
         [0027]    Further, in the present embodiment, the main bus line containers  100  and  102  are constituted so as to include three phases inclusively, thus in the main bus line container  100  main bus line conductors  152 ,  154  and  156  are arranged in an equilateral triangle, and in the main bus line container  102  main bus line conductors  181 ,  182  and  183  are likely arranged in an equilateral triangle which will be explained later, and from the main bus line containers  100  and  102  the main bus line conductors for the respective phases are led out in the direction facing each other.  
         [0028]    Still further, at the left side of the circuit breaker unit  611  a current transformer unit  120  is connected via a flange. At the current transformer  120  a vertical type line side disconnecting switch unit  124  is disposed via an insulator spacer  122 . The grounding device  114 , the current transformer unit  108 , the circuit beaker unit  611  and the current transformer unit  611  are sectioned by the insulator spacers  110   a,    110   b  and  122 , and are arranged individual gas sections in which SF 6  gas is filled.  
         [0029]    Through the above explained structure, the insulator spacer  122  can be disposed in a position which is remote from the circuit breaker section as much as possible, thereby, a possible influence of the circuit breaker section onto the insulator spacer  122  at the time when the circuit breaker unit  611  interrupts an accident current can be limited, and further the amount of gas in the circuit breaking section can be increased to thereby enhance circuit breaking performance. At the line side disconnecting switch unit  124  another grounding switch  126  is provided. Within the disconnecting switching unit  124  a stationary electrode and a movable electrode constituting the disconnecting section are provided. At the left side of the line side disconnecting switch  124  a potential transformer unit  601  is connected upward via an insulator spacer  128  and a conductor, and the conductor extended downward is connected to a cable head  132 .  
         [0030]    [0030]FIG. 3 is a side view of the second bay unit taken along line B-B′ in FIG. 1 and seen the same in the horizontal direction from the installation plane of the device, and shows a structure of the circuit breaker unit accommodating one phase conductor and being filled with SF 6  gas. The present bay unit is constituted by connecting the first and second three phase inclusive bus lines via respective gas circuit breakers.  
         [0031]    As shown in FIG. 3, at the bottom side thereof, a circuit breaker unit  631  is disposed in horizontal direction, and an operating unit  106  which drives a movable contact of the circuit breaking unit  631  is arranged at the right side of the circuit breaking unit  631 . Above the circuit breaking unit  631  a current transformer  108  and a bus line connecting conductor  404  are provided via spacers. The bus line connecting conductor  404  and the circuit breaking unit  631  are electrically connected via a tulip shaped contact. The right side of the bus line connecting conductor  404  is electrically connected to the main bus line container  202  via an insulator spacer  206 . A detachable supporting post  208  is provided between the main bus line container  202  and the installation plane thereof, thereby, even when disassembling the circuit breaking unit  631 , the main bus line container  202  is supported by the supporting post  208 . Further, the insulator spacer  206  is disposed in vertical direction with respect to the installation plane, a possible collection of metallic foreign matters on the surface of the insulator spacer  206  can be prevented which enhances reliability with respect to insulation.  
         [0032]    At the left side of the circuit breaker unit  631  a vertical type disconnecting switch  124  is arranged via an insulator spacer  122  and is connected to the main bus line container  200  via a connecting conductor  621 . A connecting conductor led out in horizontal direction from a connection port of the main bus line container  200  is connected to the connecting conductor  621  via an insulator spacer  212 . Since the main bus line containers  200  and  202  are arranged on a same horizontal plane, the distance between the connecting ports of the main bus line containers  200  and  202  can be shortened. For the main bus line container  200 , since a detachable supporting post  210  is provided, even when disassembling the circuit breaker unit  631 , the main bus line container  200  can be supported by this supporting post  210 .  
         [0033]    [0033]FIG. 4 is a cross sectional view take along line C-C′ in FIG. 1 and shows a structure in which the main bus line containers  100  and  200  are connected in a straight line via an insulator spacer  170 .  
         [0034]    Within the grounded main bus line container  100 , three phase main bus line conductors  152 ,  154  and  156  are accommodated inclusively together with SF 6  gas. Further, one ends of the main bus line conductors  152 ,  154  and  156  are secured to an insulator spacer  161  and are electrically insulated each other which will be explained later, moreover, the main bus line conductors  152 ,  154  and  156  are arranged in the main bus line container  100  so as to assume apex positions of an equilateral triangle when cross sectioning the main bus line container  100 .  
         [0035]    The one ends of the main bus line conductors  152 ,  154  and  156  are secured to the insulator spacer  161  as explained above, however, the other ends thereof include expandable joints  162 ,  164  and  166  for every phase for permitting adjustment during assembly and are slidably supported by current collectors attached to the insulator spacer  170  where the adjacent main bus line conductors  252 ,  254  and  256  are secured. Further, as mentioned above, the main bus line conductors  152 ,  154  and  156  are arranged in the main bus line container  100  so as to assume apex positions of an equilateral triangle when cross sectioning the main bus line container  100 , and one of the sides formed by connecting the apexes of the triangle is arranged in perpendicular to the horizontal direction.  
         [0036]    The main bus line conductors  152 ,  154  and  156  are provided at the vertical triangle side connection ports for every phase for connecting with the main bus line disconnecting switch unit in horizontal direction. These connecting ports are formed in perpendicular direction with respect to the installation plane and at respective connecting ports expandable joints  182 ,  184  and  186  are provided in the direction bent by 90° from the direction of the respective main bus line conductors  152 ,  154  and  156  which are supported slidable in horizontal direction by current collectors  192 ,  194  and  196  attached to insulator spacers  312 ,  314  and  316  which secure connecting conductors  652 ,  654 ,  656  accommodated in the adjacent main bus line disconnecting switch unit. Thereby, the connecting conductors  652 ,  654  and  656  in the main bus line disconnecting switch units for every phase and the main bus line conductors  152 ,  154  and  156  are kept in an electrically connected state.  
         [0037]    [0037]FIG. 5 shows a cross section taken along line E-E′ in FIG. 4. Left side thereof is the side where the main bus line disconnecting switch unit is to be connected. The main bus line conductor  152  is arranged at a position remote from the main bus line disconnecting switch unit with reference to a vertical plane passing through the center axis of the main bus line container  100  and on a horizontal plane passing the center axis thereof. The main bus line conductor  154  is arranged below the horizontal plane passing the center axis thereof and at the side near to the main bus line disconnecting switch unit with reference to the vertical plane passing through the center axis thereof. Further, the main bus line conductor  156  is arranged above the main bus line conductor  154  so as to assume one of apex positions of a regular triangle formed by the main bus line conductors  152 ,  154  and  156  arranged inside the main bus line container  100  when cross sectioned thereof. The main bus line conductor  152  is connected to a connecting conductor  654  at the same height of the main bus line conductor  152  by making use of straight line shaped connecting conductor (not shown) via an expandable joint  184  and a current collector  194 . Further, the main bus line conductor  156  is connected to a connecting conductor  652  at the same height as the main bus line conductor  152  by making use of a downwardly extending connecting conductor (not shown) via an expandable joint  182  and a current collector  192  and the main bus line conductor  154  is connected to a connecting conductor  656  at the same height as the main bus line conductor  152  by making use of an upwardly extending connecting conductor (not shown) via an expandable joint  186  and a current collector  196 .  
         [0038]    As has been explained above, since the main bus line conductors  152 ,  154  and  156  are arranged in the main bus line container  100  so as to assume apex positions of an equilateral triangle when cross sectioning the main bus line container  100 , and one of the sides formed by connecting the apexes of the triangle is arranged in perpendicular to the horizontal direction, and the perpendicular side is arranged so as to face the connecting conductors  652 ,  654  and  656  in the main bus line disconnecting switch unit, thereby, a compact connection between the main bus line conductors  152 ,  154  and  156  and the connecting conductors  652 ,  654  and  656  can be realized without disturbing connection of other main bus line conductors.  
         [0039]    Now, an embodiment with regard to main bus line container  200  will be explained.  
         [0040]    Within the grounded main bus line container  200 , three phase main bus line conductors  252 ,  254  and  256  are accommodated inclusively together with SF 6  gas. Further, one ends of the main bus line conductors  252 ,  254  and  256  are secured to the insulator spacer  170  and are electrically insulated each other which will be explained later, moreover, the main bus line conductors  252 ,  254  and  256  are arranged in the main bus line container  200  so as to assume apex positions of an equilateral triangle when cross sectioning the main bus line container  200 .  
         [0041]    The one ends of the main bus line conductors  252 ,  254  and  256  are secured to the insulator spacer  170 , however, the other ends thereof include expandable joints  262 ,  264  and  266  for every phase for permitting adjustment during assembly and are slidably supported by current collectors attached to an insulator spacer  270  where the adjacent main bus line conductors  352 ,  354  and  356  (not illustrated) are secured. Further, as mentioned above, the main bus line conductors  252 ,  254  and  256  are arranged in the main bus line container  200  so as to assume apex positions of an equilateral triangle when cross sectioning the main bus line container  200 , and one of the sides formed by connecting the apexes of the triangle is arranged in perpendicular to the horizontal direction.  
         [0042]    The main bus line conductors  252 ,  254  and  256  are provided connection ports for every phase for connecting with the main bus line disconnecting switch unit in horizontal direction at the vertical triangle side. These connecting ports are formed in perpendicular direction with respect to the installation plane and at respective connecting ports expandable joints  282 ,  284  and  286  are provided in the direction bent by 90° from the direction of the respective main bus line conductors  252 ,  254  and  256  which are supported slidable in horizontal direction by current collectors  492 ,  494  and  496  attached to insulator spacers  412 ,  414  and  416  which secure connecting conductors  621 ,  622 ,  623  accommodated in the adjacent main bus line disconnecting switch unit. Thereby, the connecting conductors  621 ,  622  and  623  in the main bus line disconnecting switch units for every phase and the main bus line conductors  252 ,  254  and  256  are kept in an electrically connected state.  
         [0043]    [0043]FIG. 6 shows a cross section taken along line D-D′ in FIG. 4. Right side thereof is the side where the connecting conductors  621 ,  622  and  623  are to be connected. The main bus line conductor  252  is arranged at a position remote from the connecting conductors  621 ,  622  and  623  with reference to a vertical plane passing through the center axis of the main bus line container  200  and on a horizontal plane passing the center axis thereof. The main bus line conductor  254  is arranged below the horizontal plane passing the center axis thereof and at the side near to the connecting conductors  621 ,  622  and  623  with reference to the vertical plane passing through the center axis thereof. Further, the main bus line conductor  256  is arranged above the main bus line conductor  254  so as to assume one of apex positions of a regular triangle formed by the main bus line conductors  252 ,  254  and  256  arranged inside the main bus line container  200  when cross sectioned thereof. The main bus line conductor  252  is connected to a connecting conductor  622  at the same height of the main bus line conductor  252  by making use of straight line shaped connecting conductor (not shown) via an expandable joint  184  and a current collector  494 . Further, the main bus line conductor  256  is connected to a connecting conductor  623  at the same height as the main bus line conductor  252  by making use of a downwardly extending connecting conductor (not shown) via an expandable joint  186  and a current collector  496  and the main bus line conductor  254  is connected to a connecting conductor  621  at the same height as the main bus line conductor  252  by making use of an upwardly extending connecting conductor (not shown) via an expandable joint  182  and a current collector  496 .  
         [0044]    As has been explained above, since the main bus line conductors  252 ,  254  and  256  are arranged in the main bus line container  200  so as to assume apex positions of an equilateral triangle when cross sectioning the main bus line container  200 , and one of the sides formed by connecting the apexes of the triangle is arranged in perpendicular to the horizontal direction, and the perpendicular side is arranged so as to face the connecting conductors  621 ,  622  and  623  in the main bus line disconnecting switch unit, thereby, a compact connection between the main bus line conductors  252 ,  254  and  256  and the connecting conductors  621 ,  622  and  623  can be realized without disturbing connection of other main bus line conductors.  
         [0045]    [0045]FIG. 7 shows a cross sectional structure when seen toward the main bus line container  200  from the cross section F-F′ in FIG. 4.  
         [0046]    The bus line container  200  includes a phase transposing portions  422 ,  424  and  426  in which terminal portions near the connecting portions of the main bus line conductors  252 ,  254  and  256  extend to match the arrangement position of the main bus line conductors  152 ,  154  and  156  in the adjacent main bus line container  100  in such a manner that the perpendicular side of a triangularly arranged main bus line conductors  252 ,  254  and  256  in the main bus line container  200  comes and faces to the opposite side in the main bus line container  100 , thereby, the connecting ports of the main bus line container  200  for the respective phases can be directed in 180° opposite direction from the connecting ports of the main bus line container  100  for the respective phases.  
         [0047]    At the portion where the three phase bus line conductors cross each other, the diameter of the bus line conductors at the phase transposing portions  422 ,  424  and  426  is reduced in comparison with that of the main bus line conductors  252 ,  254  and  256  which are running in parallel with the main bus line container  200 , thereby, sufficient electrical insulation distance between the three phase bus line conductors is ensured.  
         [0048]    The insulator spacer  170  is provided with portions of expanding only toward the main bus line container  100 , and the phase transposing portions  422 ,  424  and  426  are provided in the recessed sides in the insulator spacer  170 , thereby, the insulation distance from the phase transposing portions  422 ,  424  and  426  to the nearest connecting conductor  621  is ensured.  
         [0049]    Further, in the above embodiment, as the insulation gas SF 6  gas was exemplified, however, through the use of other insulation gas than the SF 6  gas the insulation performance of the device can be ensured. As has been explained hitherto, according to the gas insulated switchgear device of the present embodiment, the position of the triangular arrangement of the main bus line conductors in the main bus line container having a length corresponding to one bay is converted in a position of line symmetry with reference to a vertical plane passing through the center axis thereof, thereby, the direction of connecting ports with a main bus line disconnecting switch units can be varied by 180° without providing a special main bus line phase transposing unit, a possible elongation of the entire length of the gas insulated switchgear device along the main bus line containers can, of course, be prevented and as much as possible compactness of the installation area thereof is realized.  
         [0050]    Further, according to the gas insulated switchgear device of the present embodiment, in the bay interval in which a gas circuit breaker units for every three phases are provided, conversion of an arrangement position of the three phase bus conductors in the container can be realized, thereby, directions of the connecting ports with bus line conductors in adjacent containers can be varied each other, thus gas circuit breaker units of which connecting conductors leading out direction from bus line conductors is different can be arranged with the adjacent bay interval, accordingly, an entire length of the gas insulated switchgear device can be reduced and further as much as possible compactness of the entire installation area thereof is realized.  
         [0051]    According to the present invention as has been explained hitherto, even when the arrangement position of the three phase bus line conductors is varied, the entire length of the main bus line containers and the gas insulated switchgear device using the same never prolongs or the entire area thereof never enlarges beyond necessity, as well as compact main bus line containers which enhance insulation performance and operation reliability and a gas insulated switchgear device using the same can be provided.