JP4232766B2 - Vacuum switchgear - Google Patents

Description

  The present invention relates to a vacuum switchgear, and more particularly, to a vacuum switchgear that includes a plurality of switches housed in a vacuum vessel and is suitable for use as power receiving / distributing equipment for a power system.

Among the power systems, the distribution system is provided with a switch gear as an element of the power receiving and distribution equipment. Conventionally, as this type of switchgear, an air insulation type is often used, but in order to reduce the size, a gas insulation type using SF ₆ gas is adopted as an insulating medium. It is like that. However, if SF ₆ gas is used as an insulating medium, there is a risk of adverse effects on the environment. In recent years, a vacuum insulating type using vacuum insulation has been proposed as an insulating medium.

  As a vacuum-insulated switchgear, for example, as described in Patent Document 1, a plurality of pairs of main circuit opening / closing sections in which a fixed electrode and a movable electrode are arranged to face each other are housed in a vacuum vessel. The movable electrode is connected to the bus-side conductor, the fixed electrode is connected to the load-side conductor, each main circuit switching part is covered with an arc shield, and each bus-side conductor is connected via a flexible conductor. It is configured. According to this switch gear, since the vacuum insulation method is adopted, the insulation distance can be shortened compared with the gas insulation method, and the switch gear can be made compact.

JP 2000-268685 A

  In the above prior art, since each main circuit opening / closing part is covered with an arc shield, a trip operation is performed in the event of a short-circuit accident or the like, and when the movable electrode and the fixed electrode are separated, the metal vapor is discharged from each electrode. Even if this occurs, the metal vapor can be shielded by the arc shield. However, when a part of the metal vapor is scattered from the gap of the arc shield and adheres to the vacuum vessel while the vacuum vessel is grounded, a current flows from the electrode to the grounding point via the metal vapor and the vacuum vessel, and the ground. An entanglement will occur.

  In the prior art, the load-side conductor is connected to the load-side electrode rod, a part of the load-side electrode rod is protruded from the vacuum vessel, and the protruding portion is covered with the cylindrical insulator. Is fixed to the wall surface of the vacuum container, the other end is sealed with a sealing member, and a vacuum gap is formed between the cylindrical insulator and the load-side electrode rod. That is, a vacuum gap is provided between the cylindrical insulator and the load-side electrode rod in order to reduce electric field concentration caused by the difference in dielectric constant between the metal and the insulator.

  However, even if a vacuum gap is formed between the cylindrical insulator and the load side electrode rod, it is necessary to increase the vacuum gap in order to alleviate electric field concentration. The diameter of the entire cable head is increased, the occupation space is increased and workability is reduced. Moreover, when the switch is turned on, the impact generated when the movable electrode comes into contact with the fixed electrode is transmitted to the sealing member via the load side electrode rod, and tensile forces in opposite directions are applied to the sealing member and the cylindrical insulator, respectively. It acts, and there exists a possibility that the intensity | strength of the joint surface of a cylindrical insulator and a sealing member may fall.

An object of the present invention is to prevent a bus conductor from being deformed even when an operating rod for operating a switch is operated .

  In order to solve the above problems, the present invention provides a vacuum vessel to be grounded, a movable electrode held by a movable electrode rod, and a fixed electrode held by a fixed electrode rod facing each other in the vacuum vessel. A plurality of accommodated switches, one or more movable electrode-side bus conductors connected to the movable electrode rods of each of the switches, and one or more of two or more movable electrode side bus conductors connected to the fixed electrode rods of the switches A fixed electrode side bus conductor, a plurality of operating rods for connecting the movable electrode rods of the respective switches to the respective operating units outside the vacuum vessel, and a part of the operating rods connected to the fixed electrode rods of the respective switches A plurality of external pull-out rods projecting out of the vacuum container; and a plurality of insulating bushings disposed around the inside and outside of the vacuum container and covering the periphery of each external pull-out rod, Movable electrode and fixed electrode A cylindrical electrode shield disposed around to prevent scattering of metal vapor generated from the movable electrode and the fixed electrode, and a cylindrical insulating shield covering the periphery of the electrode shield; The movable electrode rod of each switch is connected to the movable electrode side bus conductor via a flexible conductor, and the movable electrode side bus conductor connected to the plurality of movable electrode rods via the flexible conductor is The vacuum switch gear is configured to be fixed to the vacuum vessel via a support member.

  In this case, the flexible conductor includes a fixed portion at both ends fixed to the movable electrode side bus conductor and the movable electrode rod, and two curved portions connecting the fixed portions at both ends with curved paths, respectively. The two curved portions are arranged separately on both sides with respect to the axis of the movable electrode rod, and an insertion hole for the operation rod is formed in a fixed portion fixed to the movable electrode side bus conductor. Can be. In addition, the bending portion of the flexible conductor may be configured by alternately stacking different metals.

  Furthermore, the vacuum switchgear according to the present invention is connected to the folding connection conductor connected to the movable electrode side bus conductor connected to the movable electrode rod via the folding flexible conductor, and to the folding connection conductor. A folding support rod that is both supported by the vacuum vessel and biases the folding connection conductor in the direction of the fixed electrode side bus conductor to which the fixed electrode rod facing the movable electrode rod is connected; The folding flexible conductor is composed of fixed portions at both ends fixed to the movable electrode side bus conductor and the connecting conductor for folding, and two curved portions connecting the fixed portions at both ends with curved paths, respectively. The two curved portions are arranged separately on both sides with respect to the axis of the connection conductor for folding, and the movable electrode side of the fixed portion It can be assumed that the insertion hole of the folded supporting rod fixed portion fixed to the linear conductor is formed.

ADVANTAGE OF THE INVENTION According to this invention, even if the operating rod which operates a switch is operated, it can prevent that a bus-bar conductor deform | transforms .

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is a cross-sectional front view of an essential part showing an embodiment of a vacuum switch gear according to the present invention, FIG. 2 is a plan view of the vacuum switch gear shown in FIG. 1, and FIG. 3 is a side view of the vacuum switch gear shown in FIG. FIG. 4 is a circuit diagram of the vacuum switchgear shown in FIG. 1 to 4, the vacuum switch gear includes a stainless steel vacuum vessel 10 as one element of power receiving and distribution equipment in the power distribution system. The vacuum vessel 10 includes an upper plate member 12, a lower plate member 14, and a side plate member 16, and the peripheries (edges) of the plate members are joined to each other by welding. Even so as to withstand vacuum pressure, it is drawn into a corrugated shape and grounded together with the equipment body. In addition, although the thing for three phases is accommodated in the vacuum vessel 10 as an element which comprises a vacuum switchgear, in this embodiment, only one phase is shown as a container of each phase separation.

  An exhaust pipe 18 and a vacuum measurement terminal 20 are fixed to the upper plate member 12, and through holes 22, 24, 26, 28 and 30 are formed. A grounding operation rod 32 is inserted into the through-hole 22 so as to freely reciprocate (up and down), and switch operating rods 34 and 36 are inserted into the through-holes 24 and 26 so as to freely reciprocate (up and down). 28, a folding support rod 38 is inserted so as to be able to reciprocate (up and down), and a switch operating rod 40 is inserted into the through hole 30 so as to be able to reciprocate (up and down). On the other hand, through holes 42, 44, 46 are formed in the lower plate member 14, the # 1 cable head 48 is inserted into the through hole 42, and the # 2 cable head 50 is inserted into the through hole 44, A # 3 cable head 52 is inserted into the through hole 46.

  The inside of the vacuum vessel 10 is evacuated through an exhaust pipe 18, and grounding switches 54 and 56, disconnecting switches 58 and 60, and circuit breakers are provided inside the vacuum vessel 10 as switches. 62 is housed, and copper ground bus conductors (ground buses) 64 and 66 and copper energizing circuit bus conductors 68, 70, and 72 are housed. Further, support members 74, 76, 78, 80, 82, 84, 86 are accommodated in the vacuum container 10. The support members 74, 76, and 78 have one end fixed to the upper member 12 and the other end fixed to the bus conductor 68 to support the bus conductor 68. One end side of the support member 80 is fixed to the lower plate member 14 and the other end side is fixed to the bus bar conductor 66 to support the bus bar conductor 66. Each of the support members 82, 84, and 86 is fixed to the lower member 14 at one end side, and fixed to the bus conductor 70 at the other end side to support the bus conductor 70.

  The grounding operation rod 32 for operating the grounding switch 54 includes a cylindrical grounding terminal 88, a cylindrical airborne ceramic movable rod 90, a bellows 92, a substantially disk-shaped base 94, a flexible conductor 96, 98, a connecting rod 100 made of stainless steel, a connecting rod 102 made of copper, and a movable electrode 104 made of copper. A screw portion 106 is formed on the ground terminal 88, and a grounding operation unit (not shown) is fastened to the screw portion 106 so that the ground terminal 88 is grounded. The bellows 92 is fixed to the upper plate member 12, a movable rod 90 is connected to the opening side end of the bellows 92, and a base 94 is fixed to one axial end of the movable rod 90. . That is, the periphery of the ground terminal 88 is sealed by the base 94, the movable rod 90, and the bellows 92. Furthermore, the movable rod 90 is joined to the flexible conductor 96 together with the base 94, and the base 94 is joined to the grounding bus conductor 64. The flexible conductor 98 is joined to the grounding bus conductor 64 and is joined to the connecting rod 102. A connecting rod 100 is inserted into the axial center of the connecting rod 102, and the connecting rod 100 is slidably inserted into rod insertion holes 108 a to 108 d penetrating the flexible conductor 98, the bus conductor 64, and the flexible conductor 96. The axial end is connected to the ground terminal 88. That is, when the ground terminal 88 reciprocates (up and down), the connecting rod 100 slides in the rod insertion openings 108a to 108d, and the movable electrode 104 contacts the fixed electrode 110 joined to the bus conductor 66. Alternatively, the movable electrode 104 is separated from the fixed electrode 110. In this case, the flexible conductors 96 and 98 are bent in accordance with the reciprocation of the ground terminal 88. Note that an operation rod (only a part of which is shown) for operating the grounding switch 56 is configured substantially the same as the operation rod 32, and the movable electrode 104 is joined to the bus conductor 70. The fixed electrode 110 is brought into contact.

  The support members 80, 82, 84, and 86 include copper support bases 112 and 114, and ceramic insulating rods 116 formed in a columnar shape. 114 are respectively joined. The support base 112 of the support member 80 is joined to the bus conductor 66, the support base 112 of the support members 82, 84, 86 is joined to the bus conductor 70, and the support base 114 of each support member 80, 82, 84, 86 is joined. Each is joined to the lower plate 14.

  The # 1 cable head 48 is joined to one end side of the bus conductor 66 via a substantially disk-shaped support base 118, and a plurality of arc-shaped grooves 118 a are formed on the cable base 48 side of the support base 118. Individual concentric circles are formed. The # 1 cable head 48 includes a copper load-side rod 120 that is an external lead rod formed in a columnar shape, and a ceramic insulating bushing 122 that is formed in a substantially cylindrical shape. A threaded portion 124 is formed at the axial end of the load side rod 120. A cable constituting the power distribution system is fastened to the screw portion 124, and an insulating portion of the cable is attached to the outer peripheral side of the insulating bushing 122. The axial ends of the load side rod 120 and the insulating bushing 122 are respectively joined to the support base 118, and a step 126 is formed on the insulating bushing 122 and a step having a smaller diameter than the step 126. 128 is formed. The load side rod 120 and the insulating bushing 122 are accommodated in the vacuum container 10 at the joint portion side with the support base 118, and a part thereof protrudes outside the vacuum container 10. A support ring 130 that contacts the step portion 126 and the lower plate member 14 is disposed on the outer peripheral side of the step portion 128, and the bottom side of the step portion 126 is supported by the support ring 130. Further, a stainless steel shield 132 formed in a cylindrical shape is disposed on the outer peripheral side of the support ring 130 and the stepped portion 126.

  A copper connecting rod 134 and a support ring 136 are joined to the other end side of the bus conductor 66, and a connecting rod 138 is joined to the connecting rod 136. The other end of the connecting rod 138 is joined to the bus conductor 68.

  The support members 74, 76, and 78 joined to the bus bar conductor 68 include a columnar support rod 140, a copper support base 142, a ceramic insulating rod 144, and a copper support base 146. Support bases 142 and 146 are joined to both ends of the rod 144 in the axial direction, the support rod 140 is joined to the support base 142, and the axial end of the support rod 140 is joined to the upper plate 12. A support base 146 is joined to the bus conductor 68. That is, the support members 74, 76, and 78 are configured to support the bus bar conductor 68 connected to the upper plate member 12 with the insulating rod 144 interposed therebetween.

  The operation rods 34, 36, and 40 for opening and closing the disconnectors 58 and 60 and the circuit breaker 62, respectively, are a cylindrical movable rod 148, a bellows 150, a support base 152, a ceramic insulating rod 154, and a copper support. The base 156 includes a connecting rod 158 made of stainless steel formed in a substantially cylindrical shape. A threaded portion 160 is formed at the axial end of the movable rod 148, and an operating device is fastened to the threaded portion 160. A copper support base 152 formed in a substantially disc shape is joined to the other axial end of the movable rod 148, and a bellows 150 is connected to the outer peripheral side of the support base 152. One end of the bellows 150 in the axial direction is fixed to the upper plate member 12, and the movable rod 148 and the support base 152 are supported by the bellows 150 so as to be reciprocally movable (up and down). A ceramic insulating rod 154 is joined to the support base 152, and a copper support base 152 is joined to one end of the insulating rod 154 in the axial direction. The connecting rod 158 is inserted into the rod insertion hole 160 formed in the bus conductor 68 or the rod insertion hole 162 formed in the bus conductor 72, the disconnectors 58 and 60, and the rod insertion hole 166 formed in the flexible conductor 164 of the circuit breaker 62. Are inserted so as to freely reciprocate (up and down), and one end in the axial direction is connected to the disconnecting devices 58 and 60 and the fixed electrode rods 168 and 170 of the circuit breaker 62.

  The disconnectors 58 and 60 include a flexible conductor 164, a stainless steel arc diffusion prevention shield 172 formed in a cylindrical shape, an annular shield 174 formed in a substantially dish shape using stainless steel, a copper movable electrode rod 168, A movable electrode 176 made of copper, a fixed electrode 178 made of copper, a fixed electrode rod 180 made of copper, a stainless steel electrode shield 182 formed in a substantially cylindrical shape, and a ceramic made in a cylindrical shape so as to cover the periphery of the electrode shield 182 Insulation shields 184 and 186, and a stainless steel shield 188 formed in a substantially cylindrical shape. The shield 188 of the disconnector 58 is joined to the fixed electrode rod 180 and the disk-shaped connection base 190. The shield 188 of the disconnector 60 is joined to the bus conductor 70 together with the fixed electrode rod 180.

  The shield 172 has an upper side joined to the bus conductor 68 and a bottom side fitted to the inner peripheral side of the insulating shield 184. One end of the flexible conductor 164 is joined to the bus conductor 68 and the other end is joined to the movable electrode rod 168. The shield 174 is disposed between the electrode shield 182 and the flexible conductor 164, and is configured to prevent the metal vapor generated from the movable electrode 176 and the fixed electrode 178 from scattering.

  The movable electrode 176 is held in a state where it is joined to one axial end portion of the movable electrode rod 168, and the fixed electrode 178 is joined to and held by one axial end portion of the fixed electrode rod 180. Around the movable electrode 176 and the fixed electrode 178, an electrode shield 182 that prevents scattering of metal vapor generated from each electrode is disposed. A flange 192 is formed on the outer periphery of the central portion in the axial direction of the electrode shield 182, and the insulating shield 184 and the insulating shield 186 are disposed separately around the electrode shield 182 with the flange 192 interposed therebetween. Yes. The insulating shields 184 and 186 are divided into two parts along the axial direction, the movable electrode side and the fixed electrode side, with the movable electrode 176 and the fixed electrode 178 as a reference. The insulating shields 184 and 186 are arranged so as to cover the regions on the outer peripheral side of the electrodes 176 and 178 together with the shields 172 and 188, and metal vapor scatters from the electrodes 176 and 178, and a part thereof. Even when scattered from the gap of the electrode shield 182, the metal vapor is prevented from scattering. Further, the insulating shields 184 and 186 are arranged to have a current through the insulating shields 184 and 186 even when the movable electrode 176 and the fixed electrode 178 are separated from each other and a potential difference is generated between the electrodes when performing an opening operation. Is prevented from flowing, and the opening operation is reliably performed.

  On the other hand, the circuit breaker 62 includes a movable electrode 194 and a fixed electrode 196 disposed opposite to the movable electrode 194. The movable electrode 194 is joined to and held at one end of the movable electrode rod 170 in the axial direction. The fixed electrode 196 is bonded and held at one end of the fixed electrode rod 198 in the axial direction. A stainless steel shield 200 is joined to the movable electrode rod 170 adjacent to the movable electrode 194, and a stainless steel shield 202 is joined to the fixed electrode rod 198 adjacent to the fixed electrode 198. Spiral grooves for confining the arc are formed on the surfaces of the movable electrode 194 and the fixed electrode 196. The other structure of the circuit breaker 62 is the same as the disconnector 58. That is, the shield 172 is joined to the bus conductor 72, and the shield 188 is joined to the connection base 190 together with the fixed electrode rod 198. The # 2 cable head 50 and the # 3 cable head 52 are configured using the same cable head 48 as the # 1 cable head 48.

  Further, in the circuit breaker 62, insulating shields 184 and 186 are disposed on the outer peripheral side of the electrode shield 182, and even when the movable electrode 194 and the fixed electrode 198 are separated from each other at the time of a trip and a potential difference occurs between the electrodes, Since the current can be prevented from flowing through the insulating shields 184 and 186, the trip operation can be reliably performed.

  On the other hand, the folding support rod 38 is provided to connect the disconnector 60 and the circuit breaker 62 in series. The support rod 38 is composed of a movable rod 204, a bellows 206, a copper support base 208, a ceramic base. An insulating rod 210, a copper support base 212, and a stainless connecting rod 214 are provided. A support base 208 is joined to one end of the movable rod 204 in the axial direction, and a bellows 206 is connected to the outer peripheral side of the support base 208. One end of the bellows 206 in the axial direction is fixed to the upper plate 12. One end of the insulating rod 210 in the axial direction is joined to the support base 208, and the support base 212 is joined to the other end of the insulating rod 210 in the axial direction. A connecting rod 214 is joined to the support base 212. The connecting rod 214 is inserted into a rod insertion hole 162 formed in the bus conductor 72 and a rod insertion hole 166 formed in the flexible conductor 164 so as to be reciprocally movable (up and down), and the tip side thereof is a copper connecting rod. 216. One end of the connecting rod 216 in the axial direction is joined to the support base 218, and the support base 218 is joined to the bus conductor 70.

  That is, the bus conductor 70 and the bus conductor 72 are connected via the support base 218, the connecting rod 216, and the flexible conductor 164. In this case, the support base 218 and the connecting rod 216 function as folding connection conductors, the flexible conductor 164 functions as a folding flexible conductor, and the support rod 38 attaches the connection rod 216 and the support base 218 to the bus conductor 70 side. It will function as a support rod for turning back.

  Each flexible conductor 164 (96, 98) includes a pair of fixed portions 164a, 164b and a pair of curved portions 164c, 164d. A rod insertion hole 166 is formed as a through hole in the fixed portion 164a. Has been. The fixed portion 164a is joined to the bus conductor 68 or 72, and the fixed portion 164b is joined to the movable electrode rod 168 or 170. Each of the curved portions 164c and 164d is configured by stacking plates made of different metals, for example, copper and stainless steel, and the curved portions 164c and 164d are based on the axis of the movable electrode rod 168 or 170. The one end side is joined to the fixing portion 164a, and the other end side is joined to the fixing portion 164b. In this case, the current from the bus conductor 68 or 72 flows to the bending portion 164c and the bending portion 164d via the fixed portion 164a, and the branched and flowing current flows through the fixed portion 164b. 168 or 170. At this time, the electromagnetic force formed by the current flowing through each of the bending portions 164c and 164d causes a force in a direction to draw the two bending portions 164c and 164d to extend the bending portions, and the bending portions 164c and 164d A force acts in a direction in which the fixed portions at both ends are separated from each other by an electromagnetic force formed by a current flowing at both ends on the fixed portion side. As a result, due to these electromagnetic forces, the joint between the fixed portion 164a and the bus conductor 68 or 72 becomes strong, the joint between the fixed portion 164b and the movable electrode rod 168 or 170 becomes strong, and the movable electrode 176 In addition, the contact force between the movable electrode 194 and the fixed electrode 196 can be increased.

  In addition, a conductive film is formed on the inner peripheral side of the insulating bushing 122 of the cable heads 48, 50, 52 in this embodiment, that is, on the surface facing the load-side rod 120, and on the inner peripheral side of the insulating bushing 122. The potential is the same as that of the load side rod 120. For this reason, the insulation gap between the load side rod 120 and the insulating bushing 122 can be minimized. That is, since the inner peripheral side of the insulating bushing 122 and the load-side rod 120 are maintained at the same potential, the difference in thermal expansion between the ceramic constituting the insulating bushing 122 and the metal constituting the load-side rod 120, specifically Specifically, it is only necessary to provide a gap corresponding to the difference in thermal expansion that occurs when heated to 800 ° C. by brazing during assembly, and the space occupied by the cable heads 48, 50, 52 is reduced. In addition, the workability can be improved.

  Further, in the cable heads 48, 50, 52 in this embodiment, a part of the cable heads 48, 50, 52 is inserted into the vacuum vessel 10 and the stepped portion 126 is supported by the ring 130. Even if the impact force generated when the movable electrode 176 or 194 is pressed toward the fixed electrode 178 or 196 acts on each cable head 48, 50, 52, the impact force is received by the ring 130 and the lower plate 14. It is possible to prevent the cable heads 48, 50, 52 from being deteriorated by the impact force.

  Further, an electromagnetic operating device (electromagnetic operating device connected to the operating rods 34 and 40), a switch (disconnector 58, circuit breaker 62), and cable heads 50 and 52 (the load side rod 120 and the insulating bushing 122) are provided. Since it arrange | positions linearly along an axial direction (vertical direction), the space between each switch can be suppressed to the minimum, and it becomes possible to contribute to size reduction of a switchgear.

  The vacuum switchgear having the above configuration can be used, for example, as a switch having functions of a rated voltage of 24 kV, a rated current of 630 A / 1250 A, and a rated short-time current of 25 kA / 3 s (4 s).

  Next, the manufacturing method of the vacuum switchgear which concerns on this invention is demonstrated based on drawing. When manufacturing the vacuum switch gear, first, each component constituting the vacuum switch gear is divided into parts. For example, the vacuum vessel 10 is divided into an upper plate member 12, a lower plate member 14, and a side plate member 16, and the support members 74 to 78 are divided into a support rod 140, a support base 142, an insulating rod 144, and a support base 146. As for the disconnector 58, the fixed portions 164a and 164b, the curved portions 164c and 164d, the shields 172 and 174, the movable electrode rod 168, the movable electrode 176, the fixed electrode 178, the fixed electrode rod 180, the electrode shield 182 and the insulating shield 184. 186, shield 188, and connection base 190.

  Next, each divided part is divided into an upper part group arranged on the upper plate 12 side, for example, a part group constituting the support members 74 to 78, a part group constituting the operation rods 34, 36, and 40, and the like. These are divided into a lower part group disposed on the lower plate member 14 side, for example, a part group constituting the support members 80, 82, 84, 86, a part group constituting the cable heads 48, 50, 52, and the like. Further, it is divided into parts having insulating properties, for example, insulating rods 114, 116, 154, insulating shields 184, 186, insulating bushing 122 and other parts.

  Thereafter, for example, a silver and copper plate (thickness: 0.1 mm) is inserted as a brazing material between the parts other than the parts having insulating properties, and these parts are placed in a vacuum atmosphere at 960 ° C. for about 10 minutes. By heating and then naturally cooling, the components are brazed together, the upper component group is fixed to the upper plate member 12, and the lower component group is fixed to the lower plate member 14.

  Next, the process proceeds to a process for brazing the parts having insulation properties to the upper part group fixed to the upper plate member 12 and the lower part group fixed to the lower plate member 14. That is, as shown in FIGS. 5A and 5B, the insulating rods 144 and 154 are fixed to the upper plate member 12 as insulating parts, and the lower plate member 14 has FIGS. As shown in (b), the insulating rod 116, the insulating shields 184 and 186, and the insulating bushing 122 are fixed as insulating parts. In the next step, a brazing material is inserted between the insulating part and the part to be brazed to the insulating part, for example, the flange 192 and the support base 118, and about By heating at 835 ° C. for about 10 minutes and then naturally cooling, the upper plate member 12 is fixed with the insulating component group and other upper component groups, and the lower plate member 14 is insulated with the lower component group and other lower parts. To fix the parts group. At this time, since the copper support base 118 and the insulating bushing 122 have different coefficients of thermal expansion, in the process in which the support base 118 and the insulating bushing 122 are brazed, the support base 118 and the insulating bushing 122 are changed with a change in temperature. Residual stress acts between the two, and either of them is deformed as it is. However, since a plurality of arc-shaped grooves 118 a are formed in the support base 118, even if residual stress acts between the support base 118 and the insulating bushing 122 as the temperature changes, this residual stress Can be absorbed by each groove 118a having a rigidity lower than that of the insulating bushing 122, and the support base 118 and the insulating bushing 122 can be securely brazed.

  Next, as shown in FIG. 7, the upper plate member 12 to which the upper component group is fixed and the lower plate member 14 to which the lower component group is fixed are arranged to face each other in an inert gas. A side plate 16 is disposed adjacent to the lower plate 14, and the periphery of the upper plate 12, the lower plate 14 and the side plate 16 is fixed by TIG welding, and the vacuum vessel 10 is sealed.

  Next, as shown in FIG. 8, a vacuum pump 220 is connected to the exhaust pipe 18, and the inside of the vacuum vessel 10 is evacuated by the vacuum pump 220. In this case, the inside of the vacuum vessel 10 is heated at 430 ° C. for about 12 hours, and the inside of the vacuum vessel 10 is evacuated. After the inside of the vacuum vessel 10 is evacuated, a vacuum measuring instrument is connected to the vacuum measurement terminal 20 to measure whether or not the inside of the vacuum vessel 10 is maintained at a specified vacuum degree.

  In the present embodiment, the component group fixed to the vacuum vessel 10 is divided into an upper component group and a lower component group, the upper component group is fixed to the upper plate member 12, and the lower component group is fixed to the lower plate member 14. Therefore, the assembly work can be easily performed.

  In addition, when brazing each part group, it is divided into two parts, that is, insulating parts and other parts, and brazing in each process is performed at different temperatures. It is possible to reliably braze each of the parts having the property and other parts.

  Furthermore, in the present embodiment, when the operating rods 34, 36, 40 are operated, the flexible conductor 164 is bent only by the reciprocating movement of the connecting rod 158, and the bus bar conductors 68, 72 are fixed. Therefore, even if the operating rods 34, 36, 40 are operated, the bus conductors 68, 72 can be prevented from being deformed.

  In the present embodiment, the disconnectors 58 and 60 provided with the insulating shields 184 and 186 have been described, but the disconnectors 58 and 60 may be omitted.

  In the above-described embodiment, the three-circuit vacuum switch gear has the grounding switches 54 and 56, the disconnectors 58 and 60, and the circuit breaker 62. However, depending on the circuit configuration and the like, the grounding switch 54 and 56, disconnectors 58 and 60, and the combination and number of circuit breakers 62 can be set arbitrarily.

  For example, when the vacuum switch gear is constituted by three disconnectors 58 and three grounding switches 54, the configuration shown in FIG. 10 can be adopted.

  Further, when the vacuum switchgear is constituted by two disconnectors 58 and two grounding switches 54, a configuration as shown in FIG. 11 can be adopted.

  Furthermore, when the vacuum switch gear is constituted by one circuit breaker 62 and one grounding switch 54, the structure shown in FIG. 12 can be adopted.

  As the circuit system, various circuit systems such as a 2-circuit, 3-circuit, 4-circuit, 5-circuit, or a combination of 3-circuit and 4-circuit can be employed.

  Also, considering that multiple vacuum switch gears are connected in series, in order to apply multiple vacuum switch gears to the open loop system, disconnectors are arranged on both sides of the circuit breaker, or multiple vacuum switches In order to apply the gear to the closed loop system, all of the components other than the earthing switch can be constituted by a circuit breaker.

  In this embodiment, since various switches arranged in the vacuum vessel 10 are vacuum-insulated, it is possible to make the main circuit maintenance-free, and by adopting an electromagnetic operating device as an operating device, Maintenance-free can be achieved. Furthermore, a short circuit accident can be prevented by separating the inside of the vacuum vessel 10 for each phase. Moreover, reliability can be improved by constantly monitoring the degree of vacuum in the vacuum container 10.

  In the present embodiment, as the container for separating each phase, the vacuum container 10 has been described in which only one phase element is accommodated. However, as shown in FIGS. The disconnectors 58U,..., 60U,..., Three-phase circuit breakers 62U, 62V, 62W, etc. for (U phase, V phase, W phase) can be accommodated in the vacuum vessel 10. In this case, on the outer peripheral surface of the vacuum vessel 10, that is, on the surface of the upper plate 12, an electromagnetic actuator (electromagnetic operation) corresponding to each operation rod 34U, ..., 36U, ..., 40U, 40V, 40W, etc. for switches. 230U, ..., 232U, 234U, 234V, 234W are fixed, and each operation rod 34U, ..., 36U, ..., 40U, 40V, 40W and each electromagnetic actuator 230U, ..., 232U, 234U, 234V, 234W Are connected to each other. The electromagnetic actuators 230U,... 232U, 234U, 234V, 234W are configured to open / close the operation rods 34U,..., 36U, ..., 40U, 40V, 40W in response to the opening / closing operation signals, respectively. Thus, each switch can be automatically opened and closed by an open / close operation signal output from a controller (not shown).

  Also, each phase electromagnetic actuator 230U,... 232U, 234U, 234V, 234W, each phase switch (disconnector 58U,..., 60U,..., Circuit breakers 62U, 62V, 62W) and each phase cable head Since the load side rods 120U, 120V, 120W,... And the insulating bushings covering each load side rod are arranged linearly along the axial direction (vertical direction), the space between each switch is minimized. Therefore, it is possible to contribute to the miniaturization of the switchgear.

  As described above, according to the present embodiment, the cylindrical electrode shield is disposed around the movable electrode and the fixed electrode, and the insulating shield is disposed around the electrode shield. Even if metal vapor is generated and part of the metal vapor is scattered from the gap between the electrode shields, the scattered metal vapor can be shielded by the insulating shield, preventing the metal vapor from adhering to the vacuum vessel. In addition, it is possible to prevent the occurrence of a ground fault phenomenon due to the generation of the metal vapor, thereby contributing to the improvement of reliability.

It is a principal part sectional front view of the vacuum switchgear which shows one embodiment of the present invention. It is a top view of the vacuum switchgear shown in FIG. It is principal part side surface sectional drawing of the vacuum switchgear shown in FIG. It is a circuit block diagram of the vacuum switchgear shown in FIG. It is a figure for demonstrating the manufacturing method of a vacuum switchgear, Comprising: (a) is a block diagram of the upper board | plate material by which a high-order component group is arrange | positioned, (b) is a side view of the upper board | plate material 12 to which the upper part group was fixed. It is. It is a figure for demonstrating the manufacturing method of the vacuum switchgear which concerns on this invention, Comprising: (a) is a top view of the lower board material to which the lower part group was fixed, (b) is the lower board material to which the lower part group was fixed. FIG. It is a figure for demonstrating the manufacturing method of the vacuum switchgear which concerns on this invention, Comprising: It is a figure for demonstrating the working method when welding an upper board material, a lower board material, and a side board material in inert gas. It is a principal part sectional front view showing the state after the vacuum switchgear concerning the present invention was assembled. It is a principal part sectional front view when this invention is applied to the vacuum switchgear which has three disconnectors and three earthing switches. It is a principal part sectional front view when this invention is applied to the vacuum switchgear which has two disconnectors and two earthing switches. It is a principal part section elevation view when the present invention is applied to a vacuum switchgear which has one circuit breaker and one earthing switch. (A) is a principal part front view when the switch for three phases is accommodated in the vacuum switch gear, (b) is a principal part side view when the switch for three phases is accommodated in the vacuum switch gear.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vacuum container 12 Upper board material 14 Lower board material 16 Side board material 48, 50, 52 Cable head 54, 56 Grounding switch 58, 60 Disconnector 62 Circuit breaker 64, 66 Grounding bus conductor 68, 70, 72 For electricity supply circuit Bus conductor 34, 36, 40 Operation rod 38 Support rod 96, 98, 164 Flexible conductor 168, 170 Movable electrode rod 176, 194 Movable electrode 178, 196 Fixed electrode 180, 198 Fixed electrode rod 120 Load side rod 122 Insulating bushing 182 Electrode shield 184, 186 Insulating shield

Claims (7)

A vacuum container to be grounded, a plurality of switches in which the movable electrode held by the movable electrode rod and the fixed electrode held by the fixed electrode rod face each other and housed in the vacuum container; One or more movable electrode-side bus conductors connected to the movable electrode rod of the switch, one or more fixed electrode-side bus conductors connected to the fixed electrode rod of each switch, and each of the switches A plurality of operating rods that connect the movable electrode rod to each operating device outside the vacuum vessel, and a plurality of external extraction rods that are connected to the fixed electrode rod of each switch and partially protrude from the vacuum vessel And a plurality of insulating bushings that are arranged over the inside and outside of the vacuum vessel and cover the circumference of each external lead rod, and each of the switches is arranged around the movable electrode and the fixed electrode. The movable electrode and the A cylindrical electrode shield that prevents scattering of metal vapor generated from the constant electrode and a cylindrical insulating shield that covers the periphery of the electrode shield are configured, and the movable electrode rod of each switch is flexible. The movable electrode side bus conductors, which are connected to the movable electrode side bus conductors via conductors and are respectively connected to the plurality of movable electrode rods via the flexible conductors, are connected to the vacuum vessel via support members. Vacuum switch gear that is fixed. 2. The vacuum switchgear according to claim 1, wherein the flexible conductor connects the movable electrode side busbar conductor and the fixed portions at both ends fixed to the movable electrode rod, and the fixed portions at both ends by curved paths, respectively. The two bending portions are arranged separately on both sides with respect to the axis of the movable electrode rod as a reference, and are fixed to the movable electrode side bus conductor on the fixed portion of the operation rod. A vacuum switchgear characterized in that an insertion hole is formed. 3. The vacuum switch gear according to claim 2, wherein the curved portion of the flexible conductor is formed by alternately stacking different metals. 2. The vacuum switchgear according to claim 1, wherein the folding connection conductor is connected to the movable electrode-side bus conductor connected to the movable electrode rod via a folding flexible conductor, and is connected to the folding connection conductor. And a folding support rod that is supported by the vacuum vessel and biases the folding connection conductor in the direction of the fixed electrode side bus conductor to which the fixed electrode rod facing the movable electrode rod is connected. The flexible conductor for folding is composed of a fixed portion at both ends fixed to the movable electrode side bus conductor and the connecting conductor for folding, and two curved portions connecting the fixed portions at both ends with curved paths, respectively. The two curved portions are arranged separately on both sides with respect to the axis of the connection conductor for folding, and the one of the fixed portions is the one of the fixed portions. Vacuum switchgear, wherein the insertion hole of the turn-back support rod be formed in the fixing portion fixed to the moving electrode side bus conductor. 2. The vacuum switch gear according to claim 1, wherein a conductive film is formed on a surface of the plurality of insulating bushings facing the external lead rods. 2. The vacuum switch gear according to claim 1, wherein the operating device, the switch, and the insulating bushing are linearly arranged along an axial direction. 2. The vacuum switch gear according to claim 1, wherein the operating device is an electromagnetic type.

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