Gas insulated switch gear device

Abstract: A gas circuit breaker 40 automatically interrupts a fault current such as a ground fault current flowing through a conductor 61 of a bus line 60. A high-speed grounding switch 10 performs a higher grounding and its releasing operation than the open and close operation of the gas circuit breaker 40 during the open and close operation thereof and guarantees the current interrupting performance and the inter-electrode insulation performance of the gas circuit breaker 40. In association with the electrode arrangement of a disconnecting switch 20, bus lines 60A and 60B are disposed in horizontal direction, a stationary electrode 13 of the high-speed grounding switch 10 is provided at the constitutional unit 21 of the disconnecting switch 20 so as to locate on the same straight line as the central axis of the bus line 60 and the movable electrode 11 at the ground side is closed along the same straight line as the central axis of the bus line 60. The stationary electrode 13 can be provided at a bent corner 91 or a branching portion 92 while locating the stationary electrode 13 and the movable electrode 11 on the same straight line as the centre axis of the bus line 60. Thereby, durability of a gas insulated switch gear device provided with a high-speed grounding switch 10 is improved while reducing the entire size and the production cost thereof.

Description: Background of the Invention 1. Field of the Industrial Application The present invention relates to a gas insulated switch gear device used, for example, for a SF 6 gas insulated enclosed type substation, and, in particular, relates to a high speed grounding switch which operates to guarantee the current interrupting performance and the inter-electrode insulation performance of a gas circuit breaker constituting one of constituent elements of the gas insulated switch gear device. 2. Conventional Art The gas insulated switch gear device of the type explained above used for a SF 6 gas insulated enclosed type substation is constituted by such constituent elements as a gas circuit breaker, a disconnecting switch, an arrester and bus lines, and the circuit breaker is designed to open such as a grounded power transmission line during a failure of power transmission lines (in particular because of lightning fault) and interrupts a fault current such as short-circuiting current and grounding fault current. In case of a power transmission of a large capacity the transmission voltage is high and the electro-static capacities between power transmission lines (bus lines) of respective phases are also large, such that even after once interrupting a fault phase current as illustrated in Fig.5 (in Fig.5 it is assumed that power transmission line c among those of a, b and c is a fault phase suffered by a lightning and the remaining power transmission lines a and b are sound phases), a duration time of a secondary arc current is prolonged due to an electro-static induction from the sound phases, which renders a high speed reclosing within a time desired for the power transmission system operation difficult. Namely, although the induced lightning surge voltage is reduced by the arrester, a primary arc current (as illustrated by reference A in Fig.5) flows in the bus line of the fault phase, thereby a surge current as illustrated by reference B is caused on a sound phase due to electro-static induction, and due to an electromotive force by the electro-static induction a further electro-static induction as illustrated by reference C is again caused on the fault phase and induces the secondary arc current. For countermeasuring the above problem, a high speed grounding switch these days has been developed. The high speed grounding switch as illustrated in Fig.5 operates at a higher speed than the open and close operation of the gas circuit breaker during the open and close operation thereof, in that the high speed grounding switch automatically grounds the both ends of the opened fault phase and immediately thereafter automatically opens the same (in other words, the high speed grounding switch grounds the fault phase after the gas circuit breaker opens the fault phase and then releases the grounding, and thereafter the gas circuit breaker recloses the fault phase) such that the current interrupting performance and the inter-electrode insulation performance of the gas circuit breaker are guaranteed. Fig.6 shows a specific arrangement example of constituent elements of a conventional gas insulated switch gear device to which the above mentioned type of a high speed grounding switch is applied, wherein numeral 40 is a gas circuit breaker, 20 a disconnecting switch, 60 a bus line, 70 an arrester, 80 a bushing and between the gas circuit breaker 40 and the disconnecting switch 20 a high speed grounding switch 10 is disposed. Numeral 24 is a further grounding switch which is designed for different use and performance from those of the high speed grounding switch 10 and operates for guaranteeing the operation of the disconnecting switch 20. Namely, the high speed grounding switch 10 is required to operate at a high speed for performing a high speed grounding operation and releasing operation thereafter in comparison with the open and close operation of the gas circuit breaker 40 during the open and close operation thereof in order to guarantee the current interrupting performance and the inter-electrode insulation performance of the gas circuit breaker 40 as explained above. On the other hand, the grounding switch 24 (as, for example, disclosed in JP-A-61-170212) for the disconnecting switch 20 is designed to ground the disconnecting switch 20 and to allow the remaining electric charge thereon to escape toward the ground side when the gas circuit breaker 40 and the disconnecting switch 20 are opened on such an occasion as of maintenance and inspection of the gas insulated switch gear device. Therefore, the grounding switch 24 is not required to operate at high speed, whether the operation is performed manually or automatically, so that problems encountered in connection with the high speed grounding switch 10, which will be explained hereinafter, are not applicable to the grounding switch 24. In Fig.6, when a fault current flows in from a power transmission line via the bushing 80, the arrester 70 and a conductor (center conductor) 61 of the bus line 60, the circuit breaker 40 opens the power transmission line (bus line) for a moment and the movable electrode (movable contact) 11 of the high speed grounding switch 10 is closed at a high speed toward the stationary electrode (stationary contact) 13 thereof provided at the conductor portion 61 of the bus line 60 in order to allow the flow-in fault current to flow out toward the ground. In the arrangement structure of Fig. 6 the central axis direction of the conductor 61 of the bus line 60 crosses at right angles to the closing direction of the movable electrode 11 of the high speed grounding switch 10, and further the movable electrode 11 moves at a high speed toward the stationary electrode 13 during fault occurrence and the conductor portion 61 is subjected to severe mechanical impact and stress, so that the durability of the conductor portion is significantly damaged. In addition, immediately after the movable electrode 11 is closed to the stationary electrode 13, an extremely large fault current flows therethrough to constitute an electrically closed circuit as illustrated by a broken line in Fig.6 and an electro-magnetic force is induced between the stationary electrode 21 and the movable electrode 22 of the disconnecting switch 20 and the movable electrode 11 of the high speed grounding switch 10 to thereby cause a stress thereon indicated by an arrow x or x', which stress damages the durability of the device as well as degrading the operating performance of the movable elements 11 and 22. For this reason, the stationary electrode 21 and the movable electrode 22 of the disconnecting switch 20, and the movable electrode 11 and the conductor 61 provided with the stationary electrode 13 of the high speed grounding switch 10 are required to employ a structure for increasing the mechanical strength, which increases the processing cost of their parts and the production cost thereof. Further, with the above arrangement structure, the high speed grounding switch 10 is accommodated in a sectioned insulation gas chamber between the gas circuit breaker 40 and the disconnecting switch 20 which requires many insulation spacers disposed therebetween. As a result, the possibility of common use of conventional parts thereof is reduced, the size of the parts for constituting the high speed grounding switch 10 increases and the entire installation space for the gas insulated switch gear device also increases. From US-A-4 038 486, US-A-4 215 256 and US-A-3 778 574 it is known to arrange the switches of a gas-insulated switch gear quite generally with the direction of movement of the moving electrode aligned along the axis of one of the bus conductors of the switch gear. Summary of the Invention It is the object underlying the invention to provide a switch gear having a reduced size and low production costs and presenting a high-speed switching performance with an improved durability. This object is met by a power transmission switch gear device according to claim 1 and a gas-insulated switch gear device according to claim 2 or 6. Preferred embodiments are disclosed in the dependent claims. According to one aspect of the present invention, in a gas insulated switch gear device having a gas circuit breaker which automatically interrupts a fault current such as a ground fault current flowing through a bus line, a high speed grounding switch which performs grounding operation of the bus line and releasing operation thereof at a higher speed than the open and close operation of the gas circuit breaker during the open and close operation of the gas circuit breaker and guarantees the current interrupting performance and the insulation performance between the stationary and movable electrodes thereof and a disconnecting switch ; a stationary electrode and a movable electrode of the disconnecting switch are disposed in vertical direction, respective bus line conductors to be connected to each of the stationary and movable electrodes of the disconnecting switch are disposed in horizontal direction at different heights with reference to the ground, further a stationary electrode of the high speed grounding switch is provided at a constituent element of the disconnecting switch in such a manner that the stationary electrode of the high speed grounding switch is located on the same straight line as the center axis of the bus line and a movable electrode of the high speed grounding switch located at the ground side is disposed so as to permit movement toward the stationary electrode of the high speed grounding switch along the same straight line as the center axis of the bus line. According to another aspect, the present invention provides a like gas insulated switch gear device having a gas circuit breaker and a high speed grounding switch ; a stationary electrode of the high speed grounding switch is provided either at a bent corner portion of the conductor of the bus line or at a branch portion of the conductor of the bus line in such a manner that the stationary electrode of the high speed grounding switch is located on the same straight line as the center axis of the bus line and a movable electrode of the high speed grounding switch located at the ground side is disposed so as to permit movement toward the stationary electrode of the high speed grounding switch along the same straight line as the center axis of the bus line. With the above explained constitution according to one aspect of the present invention, when a fault such as due to lightning occurs on a power transmission line, the gas circuit breaker at first opens and thereafter, and until the gas circuit breaker recloses, via the high speed grounding switch a high speed grounding of the fault power transmission line and releasing operation thereof are performed (the closing and opening operation of the high speed grounding switch), thereby the fault current such as ground fault current is caused to flow out in a moment to the ground. Further, in association with the location of the electrodes of the disconnecting switch, the bus line conductor between the gas circuit breaker and the disconnecting switch and the bus line conductor between the arrester and the disconnecting switch are arranged in horizontal direction with a height difference with reference to the ground level and this height difference makes it possible to provide the stationary electrode of the high speed grounding switch at a constituent member of the disconnecting switch (for example, the stationary electrode of the disconnecting switch) in such a manner that the stationary electrode of the high speed grounding switch is located on the same straight line as the center axis of the bus line, while it is further possible to locate the movable electrode at the ground side of the high speed grounding switch so as to close the same along the same straight line as the center axis of the bus line toward the stationary electrode of the high speed grounding switch. Accordingly, during the operation of the high speed grounding switch when the movable electrode thereof is closed to the stationary electrode, the mechanical impact force caused by the movable electrode is received by a constituent member of the disconnecting switch (a constituent member of the disconnecting switch on which the stationary electrode of the high speed grounding switch is provided) which is supported by the bus line conductor along the axis thereof. As a result, the mechanical impact force caused by the closure of the movable electrode of the high speed grounding switch is absorbed both by the constituent member at the disconnecting switch side and by the bus line along the axis thereof. Accordingly, no bending stress is caused on the bus line conductor by the high speed closing operation of the movable electrode of the high speed grounding switch and the gas insulated switch gear device is structured to fully withstand the mechanical impact caused by the closure. Further, from an electrical point of view, since it is designed that the fault current flowing-in from a power transmission line flows out along a straight line through the bus line conductor, the constituent member of the disconnecting switch, the stationary electrode of the high speed grounding switch and the movable electrode of the high speed grounding switch, an electro-magnetic force due to the fault current possibly caused between the respective constituent members is greatly suppressed, so that the necessity of structuring the bus line conductor and the electrodes in view of the electro-magnetic force due to the fault current is eliminated. With the above explained constitution according to the second aspect of the present invention, unlike the first aspect of the present invention, the stationary electrode of the high speed grounding switch is not provided at the constituent member of the disconnecting switch, but is provided either at a bent corner portion of the bus line conductor or at a branch portion of the bus line conductor in such a manner that the stationary electrode of the high speed grounding switch is located on the same straight line as the center axis of the bus line, the movable electrode at the ground side opposing to the stationary electrode can be disposed in such a manner that the movable electrode is permitted to close toward the stationary electrode along the same straight line as the center axis of the bus line. With the above structure, the mechanical impact force caused by the closure of the movable electrode of the high speed grounding switch is received by the stationary electrode of the high speed grounding switch which is supported by the bus line conductor along the axial direction thereof. As a result, the mechanical impact force caused by the closure of the movable electrode of the high speed grounding switch is absorbed by the bus line along the axis thereof. Accordingly, like the constitution according to the first aspect of the present invention, no bending stress is caused on the bus line conductor by the high speed closing operation of the movable electrode of the high speed grounding switch and the gas insulated switch gear device is structured to fully withstand the mechanical impact caused by the closure. Further, from an electrical point of view, since it is designed that the fault current flowing-in from a power transmission line flows out through the bus line conductor, the stationary electrode of the high speed grounding switch and the movable electrode of the high speed grounding switch, an electro-magnetic force due to the fault current possibly caused by the above current flow path is greatly suppressed, so that the necessity of structuring the bus line conductor and the electrodes in view of the electro-magnetic force due to the fault current is eliminated. Brief Description of the Drawings Fig.1 is a constitutional diagram of a major portion of a first embodiment of a gas insulated switch gear device according to the present invention ; Fig.2 is a constitutional diagram of a major portion of a second embodiment of a gas insulated switch gear device according to the present invention ; Fig.3 is a constitutional diagram of a major portion of a third embodiment of a gas insulated switch gear device according to the present invention ; Fig.4 is a constitutional diagram of a major portion of a fourth embodiment of a gas insulated switch gear device according to the present invention ; Fig.5 is a diagram for explaining the use and function of a high speed grounding switch ; and Fig.6 is a constitutional diagram of a conventional gas insulated switch gear device provided with a high speed grounding switch. Detailed Description of Preferred Embodiments Embodiments according to the present invention are explained with reference to Fig.1 through Fig.4. Fig.1 is a constitutional diagram of a major part of a first embodiment of a gas insulated switch gear device according to the present invention wherein the elements represented by the same reference numerals as in the conventional example as illustrated in Fig.6 designate the same or equivalent elements as in the conventional example. Namely, in Fig.1 numeral 40 is a gas circuit breaker, 20 a disconnecting switch, 60A and 60B are bus lines, numeral 10 is a high speed grounding switch which is designed to guarantee the operation of the gas circuit breaker 40 and numeral 24 is another grounding switch which is also designed to guarantee the operation of the disconnecting switch 20. Although the illustration is omitted in the present drawing, the gas insulated switch gear device is also provided with an arrester and a bushing like one in Fig.6. Further, for application to three phase power transmission lines each of the gas insulated switch gear devices of the present embodiment is provided for the respective phases. In Fig.1, the gas circuit breaker 40 and the arrester (see reference numeral 70 in Fig.6) are disposed at different heights and the disconnecting switch 20 placed between these two members is disposed vertically with respect to the ground. Namely, the disconnecting switch 20 is constituted by a conductive member 22A, which supports the movable electrode (movable contact) 22 while permitting reciprocating movement thereof in vertical direction, and the stationary electrode (stationary contact) 21, so arranged as to oppose each other in up and down relation. In association with this arrangement, the bus line 60A connecting the gas circuit breaker 40 to the disconnecting switch 20 and the bus line 60B connecting the disconnecting switch 20 to the arrester (not shown) are disposed horizontally with respect to the ground, and the bus line 60A between the disconnecting switch 20 and the gas circuit breaker 40 is disposed at a higher level with reference to the disconnecting switch 20 than the bus line 60B between the arrester and the disconnecting switch 20 so as to constitute a height difference therebetween. On a side wall of an enclosed container for the disconnecting switch 20, in addition to the grounding switch 24 which guarantees the operation of the disconnecting switch 20 when the same is opened, the high speed grounding switch 10 is also provided. The high speed grounding switch 10 is designed to guarantee the current interrupting performance and the inter-electrode insulating performance of the gas circuit breaker 40 through higher speed grounding and its releasing operation than the open and close operation of the gas circuit breaker 40 during the open and close operation thereof when a fault such as lightning fault occurs. The use and function of the high speed grounding switch 10 are different from those of the grounding switch 24, as already explained in connection with the conventional example as illustrated in Fig.6. Numeral 23 is a cylindrically shaped insulating supporting member which is designed to support a constituent element of the disconnecting switch 20 such as the stationary electrode 21 at the bottom portion of the disconnecting switch 20. Numeral 50 is an insulating spacer which is designed to support the conductor (center conductor) 61 of the bus line 60 and to section the gas circuit breaker 40 and the disconnecting switch 20. The stationary electrode 13 of the high speed grounding switch 10 is provided at a side face of a constituent element of the disconnecting switch 20 (for example, at the stationary electrode 21 of the disconnecting switch) so as to locate the same on the same straight line as the center axis of the bus line 60B. The movable electrode 11 of the high speed grounding switch 10 is located so as to permit closure of the same toward the stationary electrode 13 along the same straight line as the center axis of the bus line 60B. Numeral 14 is an actuating unit for the high speed grounding switch 10 which has an automatic control function of high speed open and close operation for the movable electrode 11. When a fault such as lightning fault occurs on a power transmission line, the gas circuit breaker 40 in the gas insulated switch gear device having the above explained structure at first opens and thereafter and until the gas circuit breaker 40 recloses, via the high speed grounding switch 10 a high speed grounding and its releasing operation (closing and opening operation of the high speed grounding switch) is performed and a fault current such as ground fault current is caused to flow away in a moment toward the ground. When the high speed grounding switch 10 is operated as explained above, the movable electrode 11 at the ground side of the high speed grounding switch 10 is closed toward the stationary electrode 13 along the same straight line as the center axis of the bus line 60B. Thereby, the mechanical impact force of the movable electrode 11 caused when the high speed grounding switch 10 is closed is received by a constituent element (a constituent element provided with the stationary electrode 13 of the high speed grounding switch) 21 of the disconnecting switch 20 which is supported by the conductor 61 of the bus line 60B along the axial direction thereof. As a result, the mechanical impact due to the closure of the movable electrode 11 is absorbed by the constituent element 21 located at the disconnecting switch 20 and by the bus line 60B along its axial direction. Accordingly, no bending stress is caused on the bus line conductor by the high speed closing operation of the movable electrode 11 of the high speed grounding switch 10 and the gas insulated switch gear device is structured to fully withstand the mechanical impact caused by the closure. In particular, in the present embodiment the stationary electrode 13 of the high speed grounding switch 10 is secured to the stationary electrode 21 of the disconnecting switch 20 which is then supported by the insulating supporting member 23 from the bottom side of the disconnecting switch 20 as well as via an end of the conductor 61 of the bus line 60B arranged in parpendicular to the insulating supporting member 23 to thereby constitute a very stable two point supporting structure. As a result, the stationary electrode 21 of the disconnecting switch 20 is structured to fully withstand mechanical impacts in both vertical and horizontal directions and is provided with a sufficient mechanical strength with respect to the mechanical impact caused by the closure of the movable electrode 11 of the high speed grounding switch 10. Further, from an electrical point of view, since it is designed that the fault current flowing-in from a power transmission line flows out along a straight line through the conductor 61 of the bus line 60B, the stationary electrode 21 of the disconnecting switch 20, the stationary electrode 13 of the high speed grounding switch 10 and the movable electrode 11 of the high speed grounding switch 10, an electro-magnetic force due to the fault current possibly induced, such as between the stationary electrode 21 and the movable electrode 22 of the disconnecting switch 20 and the movable electrode 11 of the high speed grounding switch 10, is prevented, so that no stress associated with the electro-magnetic force is generated. As a result, unlike the case of the conventional example of Fig. 6, wherein the high speed grounding switch 10 is disposed between the disconnecting switch 20 and the gas circuit breaker 40, the necessity of structuring the bus line conductors and the electrodes in view of mechanical structure against a possible electro-magnetic force due to the fault current is eliminated, and the durability of the gas insulated switch gear device according to the present embodiment is improved. Further, requirement with regard to mechanical strength of the respective constituent elements of the high speed grounding switch and the disconnecting switch is reduced to thereby lower the cost thereof as well as the entire structure of the device is simplified to thereby increase the reliability thereof. Further, in the present embodiment the high speed grounding switch 10 is constituted as an additional member to the disconnecting switch 20, it is unnecessary to arrange two pieces of insulation spacers 50 between the disconnecting switch 20 and the gas circuit breaker 40 and to define and form a special operating space for the high speed grounding switch 10, thereby the conventionally required space for the installation of the high speed grounding switch 10 is saved and the entire size of the gas insulated switch gear device is reduced. Still further, in the present embodiment, since the high speed grounding switch 10 is disposed at a lower level, an earthquake resistance property is provided. In the present embodiment, the stationary electrode 13 of the high speed grounding switch 10 is provided at the stationary electrode 21 of the disconnecting switch 20, however the present invention is not limited to such arrangement and other arrangements are also possible, and one in the following embodiment is an example thereof. Fig.2 is a view for explaining a major portion of the second embodiment according to the present invention, wherein the elements bearing the same reference numerals as in the first embodiments represent the same or equivalent elements as in the first embodiment. Differences of the present embodiment from the first embodiment are in the arrangement that the stationary electrode 13 of the high speed grounding switch 10 is provided at a side face of the movable electrode supporting member 22A of the disconnecting switch 20 so as to locate the same on the same straight line as the center axis of the bus line 60A. On one hand, the movable electrode 11 is disposed so as to permit the closure thereof toward the stationary electrode 13 along the same straight line as the center axis of the bus line 60A. In the present embodiment, the movable electrode supporting member 22A of the disconnecting switch 20 is fixedly held via the conductor 61 of the bus line 60A disposed horizontally between the gas circuit breaker 40 and the disconnecting switch 20 and via the insulating spacer 50. In the present embodiment, during the operation of the high speed grounding switch 10 the movable electrode 11 of the high speed grounding switch 10 located at the ground side is closed toward the stationary electrode 13 along the same straight line as the center axis of the bus line 60A. Thereby, the mechanical impact force of the movable electrode 11 caused when the high speed grounding switch 10 is closed is received by a constituent element (a constituent element provided with the stationary electrode 13 of the high speed grounding switch) 22A of the disconnecting switch 20 which is supported by the conductor 61 of the bus line 60A along the axial direction thereof. As a result, the mechanical impact due to the closure of the movable electrode 11 is absorbed by the constituent element 22A located at the disconnecting switch 20 and by the bus line 60A along its axial direction. Accordingly, like the first embodiment no bending stress is caused on the bus line conductor by the high speed closing operation of the movable electrode 11 of the high speed grounding switch 10 and the gas insulated switch gear device is structured to fully withstand the mechanical impact caused by the closure. In the present embodiment, constituent parts subjected to the stress induced by the electromagnetic force due to the fault current are decreased as much as possible. The actuating unit 14 for the high speed grounding switch 10 is disposed at the opposite side from the gas circuit breaker 40 with respect to the disconnecting switch 20. With this arrangement, the necessity of structuring the conductors and the electrodes in view of their mechanical strength in the case where the high speed grounding switch 10 is disposed between the disconnecting switch 20 and the gas circuit breaker 40 is eliminated as well as the conventional installation space for the high speed grounding switch 10 is saved. Further, when the stationary electrode 13 of the high speed grounding switch 10 is constituted to serve also as the stationary electrode 21 of the disconnecting switch 20 or the movable electrode supporting member 22A of the disconnecting switch 20, the same advantages as explained in connection with the first and second embodiments are achieved and in addition the number of required constituent parts is decreased. Fig.3 shows a third embodiment according to the present invention. The present embodiment is applied when the gas insulated switch gear device includes a constituent unit 90 to which the conductor 61 of the bus line 60 is connected by bending the same at a right angle. The stationary electrode 13 of the high speed grounding switch 10 is provided at a portion 91 where the conductor 61 of the bus line 60 is bent at a right angle so as to locate the stationary electrode 13 on the same straight line as the center axis of the bus line 60. On one hand, the movable electrode 11 of the high speed grounding switch 10 located at the ground side is disposed so as to permit closure thereof toward the stationary electrode 13 along the same straight line as the center axis of the bus line 60. According to the present embodiment, the mechanical impact force caused by the closure of the movable electrode 11 of the high speed grounding switch 10 is received by the stationary electrode 13 of the high speed grounding switch 10 which is supported by the conductor 61 of the bus line 60 along the axial direction thereof. As a result, the mechanical impact caused by the closure of the movable electrode 11 is absorbed by the bus line along the axial direction thereof. Accordingly, like the first embodiment no bending stress is caused on the bus line conductor by the high speed closing operation of the movable electrode 11 of the high speed grounding switch 10 and the gas insulated switch gear device is structured to fully withstand the mechanical impact caused by the closure. Further, from electrical point of view, since it is designed that the fault current flowing-in from a power transmission line flows out through conductor 61 of the bus line 60, the stationary electrode 13 of the high speed grounding switch 10 provided at the bus line conductor 61 and the movable electrode 11 of the high speed grounding switch 10 along a straight line, an electro-magnetic force due to the fault current possibly caused by the above current flow path is greatly suppressed so that the necessity of structring the bus line conductor and the electrodes in view of the electro-magnetic force due to the fault current is eliminated, and the same advantages as explained in connection with first and second embodiments are also obtained. Fig. 4 shows a fourth embodiment according to the present invention. The present embodiment is applied when the gas insulated switch gear device includes a constitutional unit 90 to which the conductor 61 of the bus line 60 is connected by branching the same. The stationary electrode 13 of the high speed grounding switch 10 is provided at a portion 92 where the conductor 61 of the bus line 60 is branched so as to locate the stationary electrode 13 on the same straight line as the center axis of the bus line 60. On one hand, the movable electrode 11 of the high speed grounding switch 10 located at the ground side is disposed so as to permit closure thereof toward the stationary electrode 13 along the same straight line as the center axis of the bus line 60. With the present embodiment, like functioning and advantages as those of the third embodiment are also obtained. In the gas insulated switch gear device provided with the high speed grounding switch according to the present invention, no bending stress due to a high speed closing operation of the movable electrode of the high speed grounding switch is caused on the bus line conductor, the device is further structured to fully withstand the mechanical impact induced by the closure of the movable electrode, further from electrical point of view the device is structured so as to suppress the electro-magnetic force induction between the bus line conductor and respective constitutional units due to a fault current flowing in from a power transmission line, accordingly, the durability of the gas insulated switch gear device is improved with a low production cost without necessitating a special consideration with respect to mechanical strength of the bus line conductor and constituent parts of respective constitutional units. Further, the structure of the device is simplified, thereby the reliability thereof is improved. Further, the conventional necessity of defining and forming the special operating space by making use of the insulating spacers for the high speed grounding switch between the disconnecting switch and the gas circuit breaker is eliminated, the installation space for the high speed grounding switch is limited and the entire size of the gas insulated switch gear device is reduced.

Claims: A power transmission switch gear device having a gas circuit breaker (40) which automatically interrupts a fault current flowing through a bus line (60), a high-speed grounding switch (10) which performs grounding operation of the bus line (60) and releasing operation thereof at a higher speed than the open and close operation of said gas circuit breaker (40) during the open and close operation of said gas circuit breaker (40) and guarantees the current interrupting performance and the insulation performance between stationary and movable electrodes of said gas circuit breaker (40), and a disconnecting switch (20), characterised in that a stationary electrode (13) of said high-speed grounding switch (10) is formed at a location where two conductor portions (61) of the bus line (60) join each other at an angle, and that the moving direction of a movable electrode (11) of said high-speed grounding switch (10) is coaxial with one of said bus line conductor portions (61). A gas insulated switch gear device having a gas circuit breaker (40) which automatically interrupts a fault current flowing through a bus line (60), a high-speed grounding switch (10) which performs grounding operation of the bus line (60) and releasing operation thereof in a higher speed than the open and close operation of said gas circuit breaker (40) during the open and close operation of said gas circuit breaker (40) and guarantees the current interrupting performance and the insulation performance between stationary and movable electrodes (11) of said gas circuit breaker (40), and a disconnecting switch (20) including a stationary electrode (21) and a movable electrode (22) which are disposed in the vertical direction, wherein respective bus line conductors (61) to be connected to each of the stationary (21) and movable electrodes (22) of said disconnecting switch (20) are disposed in the horizontal direction at different height with reference to the ground, characterized in that a stationary electrode (13) of said high-speed grounding switch (10) is provided at a constituent element (21,22A) of said disconnecting switch (20) and is located on the longitudinal direction of the bus line (60), and that a movable electrode (11) of said high-speed grounding switch (10) located at the ground side is disposed so as to permit movement toward the stationary electrode (13) of said high-speed grounding switch (10) along the longitudinal direction of the bus line (60). The device of claim 1 or 2, wherein said disconnecting switch (20) is provided with a grounding switch (24) for said disconnecting switch (20) which guarantees the operation of said disconnecting switch (20) together with said high-speed grounding switch (10). The device of any preceding claim, wherein the stationary electrode (13) of said high-speed grounding switch (10) is provided either at the stationary electrode (21) of said disconnecting switch (20) or at a supporting member (22A) of the movable electrode (22) of said disconnecting switch (20). The device of any preceding claim, wherein the stationary electrode (13) of said high-speed grounding switch (10) is designed to serve either as the stationary electrode (21) of said disconnecting switch (20) or as a supporting member (22A) of the movable electrode (22) of said disconnecting switch (20). A gas insulated switch gear device having a gas circuit breaker (40) which automatically interrupts a fault current flowing through a bus line (60), a high-speed grounding switch (10) which performs grounding operation of the bus line (60) and releasing operation thereof at a higher speed than the open and close operation of said gas circuit breaker (40) during the open and close operation of said gas circuit breaker (40) and guarantees the current interrupting performance and the insulation performance between stationary and movable electrodes of said gas circuit breaker (40), and a disconnecting switch (20), characterised in that a stationary electrode (13) of said high-speed grounding switch (10) is provided at a bent or branch corner portion (91; 92) of the conductor (61) of the bus line (60) in such a manner that the stationary electrode (13) of said high-speed grounding switch (10) is located on the longitudinal direction of the bus line (60), and that a movable electrode (11) of said high-speed grounding switch (10) located at the ground side is disposed so as to permit movement toward the stationary electrode (13) of said high-speed grounding switch (10) along the longitudinal direction of the bus line (60). The device of any preceding claim, wherein said fault current is a ground fault current. The device of any preceding claim, wherein the stationary electrode (13) of said high-speed grounding switch (10) is disposed on the constituent element (21) of said disconnecting switch (20) at the same straight line as the centre axis of the bus line (60).

Inventors: ANNOU KENJI, OHNO MASATOMO, YAGINUMA KYUJI, ANNOU, KENJI, OHNO, MASATOMO, YAGINUMA, KYUJI
Applicants: HITACHI LTD, HITACHI, LTD.
Application year: 1995
Main classification: H02B13
IPC codes: H02B13, H01H31