JP4386477B2 - Switchgear - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a movable electrode of a main circuit switch that contacts and separates a bus-side conductor and a load-side conductor, and a transmission member that transmits an operating force to the movable electrode inside the vacuum vessel that houses the main circuit switch. The present invention relates to a connected switchgear.
[0002]
[Prior art]
Switch gears (closed switchboards) used to distribute power received from the busbars to various load devices and other electrical rooms are for connecting the busbar side conductors for connection to the busbars and the power transmission cable to the load Internal devices such as main circuit switches that connect and disconnect the bus-side conductors and load-side conductors together with connecting conductors such as load-side conductors, ground switches for grounding the load-side conductors, and control devices required for monitoring and control Are appropriately arranged in an outer box made of ground metal.
[0003]
As a kind of such switchgear, a main circuit switch that opens and closes a large current is housed in a vacuum vessel maintained at a high vacuum of about 10 ⁻⁷ Torr, and has a high dielectric strength in a high vacuum. There is a switchgear that uses the good arc extinguishing action to stably perform the opening and closing.
[0004]
FIG. 9 is a side sectional view showing the configuration of the main part of the switchgear disclosed in Japanese Utility Model Laid-Open No. 54-183669. This switchgear includes a bus-side conductor 18 supported by one lid plate 16 and a load side supported by the other lid plate 17 in a vacuum vessel 15 whose both sides are closed by lid plates 16 and 17. The conductor 19 is coaxially opposed to each other, and fixed contacts 22 and 23 are respectively fixed to the opposing end portions to constitute a fixed electrode, and the peripheral wall of the vacuum vessel 15 is axially extended via a bellows 25 The operation rod 24 is supported so as to be movable to the movable rod 27, and the movable contacts 27 and 28 are respectively fixed on both sides of the bridging conductor 26 fixed to the tip of the operation rod 24 so as to face the fixed contacts 22 and 23, respectively. Thus, the movable electrode is configured, the extension end of the bus-side conductor 18 to the outside of the lid plate 16 is connected to a bus bar (not shown) via the connection conductor 20, and the load-side conductor 19 to the outside of the lid plate 17 is connected. The extension end is connected to a power transmission cable to a load (not shown) via a connection conductor 21 to constitute a main circuit switch.
[0005]
In the main circuit switch thus configured, the operating rod 24 is operated outside the vacuum vessel 15 to move the bridging conductor 26, and the movable contacts 27, 28 on both sides thereof are fixed contacts 22, 23. As a result, the switching operation can be performed between the bus-side conductor 18 and the load-side conductor 19.
[0006]
That is, as shown by the solid line in the figure, in a closed state where the movable contacts 27 and 28 on both sides of the bridge conductor 26 are in contact with the fixed contacts 22 and 23, the current from the bus is connected to the connecting conductor 20 and the bus-side conductor. 18, flows to the bridging conductor 26 via the fixed contact 22 and the movable contact 27, and is further transmitted to the load side via the movable contact 28, the fixed contact 23, the load side conductor 19 and the connection conductor 21. As indicated by the chain line, in the open circuit state in which the movable contacts 27, 28 on both sides of the bridge conductor 26 are separated from the fixed contacts 22, 23, the current flows between the movable contacts 27, 28 and the fixed contacts 22, 23. Is cut off.
[0007]
The inner surface of the vacuum vessel 15 is covered by an arc shield 29 attached to the peripheral wall of the vacuum vessel 15 and shield cylinders 30 and 31 erected on the lid plates 16 and 17 on both sides, respectively, and the blocking operation is thereby performed. In some cases, metal vapor generated by the main circuit arc is sometimes captured to prevent adhesion to the insulator exposed inside the vacuum vessel 15.
[0008]
[Problems to be solved by the invention]
In the switch gear configured as described above, the operating rod 24 is automatically or manually operated outside the vacuum vessel 15, and this operating force is applied to the movable electrode composed of the bridging conductor 26 and the movable contacts 27 and 28. Acts as an operating member to convey. Therefore, in the configuration in which the operation rod 24 is automatically operated, in order to prevent the occurrence of an accident due to the inflow of abnormal current to the operation mechanism, and in the configuration in which the operation rod 24 is manually operated, the operation for performing this operation is performed. In order to ensure the safety of the operator, it is necessary to prevent the main circuit current that is opened and closed as described above from flowing into the operation rod 24 as the operation member. A connecting member made of an insulator is interposed at an appropriate position between the attachment end of the bridging conductor 26 on the side and the operation end on the other side to cut off the flow of the main circuit current.
[0009]
Such a connecting member can be provided inside and outside the vacuum vessel 15, but when provided inside, a short connecting member can be used utilizing the dielectric strength in high vacuum. On the other hand, when provided outside, an additional configuration such as providing an insulating chamber filled with an insulating gas such as sulfur hexafluoride around the insulating member so as to obtain predetermined insulating characteristics is required. In order to obtain a reduced switchgear, it is advantageous to provide the connecting member inside the vacuum vessel.
[0010]
However, when a connecting member is provided inside the vacuum vessel 15, metal vapor generated by the main circuit arc during the shut-off operation of the main circuit switch disposed in the common vacuum vessel 15 adheres to the surface of the connecting member. There is a problem of doing. Since this metal vapor has conductivity, the surface resistance and creepage breakdown voltage of the connecting member are reduced, it becomes impossible to prevent the main circuit current from flowing from the movable electrode to the operation member, and the adhesion increases with time. There is a problem that the insulation cannot be maintained by the metal, and there is a possibility of causing a ground fault, and the reliability of the product cannot be maintained.
[0011]
The present invention has been made in view of such circumstances, and in a configuration in which a connecting member made of an insulator for connecting a movable electrode and an operating member is arranged inside a vacuum vessel common to a main circuit switch, An object of the present invention is to provide a switchgear that can prevent deterioration of insulating properties due to the adhesion of vapor and can maintain good insulating properties over a long period of time.
[0012]
[Means for Solving the Problems]
The switchgear according to the first aspect of the present invention provides an insulating connecting member for connecting the movable electrode of the main circuit switch and the operating member inside the vacuum vessel, and the outer side of the insulating core member is connected to the core member. And a layer structure covered with a surface material made of an insulator having an outer surface with a smaller surface roughness .
[0025]
In this invention, the surface of a widely used core material made of an insulator mainly composed of aluminum oxide is rougher than that used as a core material such as an insulator mainly composed of silicon oxide. A connecting member is formed by covering with a small-sized insulator. Since the surface roughness of the insulator serving as the metal vapor deposition surface is small, the creepage breakdown voltage is high, and good insulation characteristics can be obtained.
[0026]
According to a second aspect of the present invention, there is provided a switchgear comprising a metal inside the vacuum vessel between the main circuit switch and a connecting member made of an insulator for connecting the movable electrode of the main circuit switch and the operating member inside the vacuum vessel. The contact with the portion is cut off, and a shielding member is disposed on a part of the vacuum vessel, and the shielding member is connected to a constant potential portion outside the vacuum vessel.
[0027]
In this invention, a shielding member is arranged between the main circuit switch inside the vacuum vessel and the connecting member, and metal vapor generated by the main circuit arc is attached to the shielding member, thereby reducing the adhesion to the connecting member. Thus, the deterioration of the insulation characteristics accompanying this adhesion is prevented.
[0029]
In this invention, a metal shielding member that is insulated and supported by a part of the vacuum vessel is connected to a constant potential portion outside the vacuum vessel and maintained at a ground potential or a negative potential, and metal vapor generated by the main circuit arc is generated. By securely grasping this shielding member, the adhesion to the connecting member is reduced, and the deterioration of the insulation characteristics accompanying this adhesion is prevented.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
It is described in detail with reference to following Shitahon invention with reference to the drawings showing embodiments thereof.
Reference form 1
Figure 1 is a side sectional view showing a configuration of a main part of the switchgear reference embodiment 1. This switchgear constitutes a main circuit switch that opens and closes between the bus-side conductor 3 and the load-side conductor 4 inside the vacuum vessel 11 kept at high vacuum. The bus-side conductor 3 is supported through a support member 10a made of an insulator in such a manner that it passes through a substantially central portion of one end wall of the vacuum vessel 11, and the load-side conductor 4 is provided on the peripheral wall of the vacuum vessel 11. It is supported through a support member 10b made of an insulator so as to penetrate a part.
[0031]
An operation rod 6b is supported on the other end wall of the vacuum vessel 11 through the bellows 7 so as to be movable in the axial direction, and at the end of the operation rod 6b extending inside the vacuum vessel 11, movable electrode 6a is, are connected as described below via the coupling member 5 made of insulation material. The tip of the movable electrode 6a is abutted substantially coaxially with the bus-side conductor 3, and the fixed contact 1 and the movable contact are connected to the tip of the movable electrode 6a and the tip of the bus-side conductor 3 as a fixed electrode. 2 are fixed to each other.
[0032]
The load-side inner end portion of the conductor 4 which is supported on the peripheral wall of the vacuum chamber 11, is connected to a fixed member 9 via the connecting conductor 8 having flexibility. The fixed member 9 is joined to an electrode member 6c provided integrally with an end portion of the movable electrode 6a on the connection side with the connection member 5. The outer end of the load-side conductor 4 is connected to a power transmission cable to a load (not shown), and the outer end of the bus-side conductor 3 supported by the end wall of the vacuum vessel 11 is connected to a bus (not shown). ing.
[0033]
The outer end of the operating rod 6b supported on the other end wall of the vacuum vessel 11 is connected to an operating mechanism (not shown), and the operating rod 6b is moved in the axial length direction according to the operation of the operating mechanism. This movement is transmitted to the movable electrode 6a via the connecting member 5, and the movable contact 2 at the tip of the movable electrode 6a contacts and separates from the fixed contact 1, and the bus side conductor 3 and the load side conductor 4 , That is, between the bus and the power transmission cable to the load.
[0034]
FIG. 1 shows an open circuit state. When the operating rod 6b is moved in the left direction of the figure from this state, the movable contact 2 is pressed via the connectionless member 5 and the movable electrode 6b to be a fixed contact. 1 is contacted to obtain a closed state. At this time, the main circuit current from the bus (not shown) flows to the movable electrode 6a through the bus-side conductor 3, the fixed contact 1 and the movable contact 2, and is further illustrated through the fixed member 9, the connection conductor 8 and the load-side conductor 4. Not transmitted to the transmission cable.
[0035]
On the other hand, in this closed state, when the operating rod 6b is moved in the right direction in the figure, the movable contact 2 is pulled away from the fixed contact 1 by the tensile force acting via the connecting member 5 and the movable electrode 6b. The open circuit state shown is obtained, and the flow of the main circuit current from the bus-side conductor 3 to the load-side conductor 4 is interrupted. Note that the fixed contact 1 and the movable contact 2 are disposed inside the vacuum vessel 11, and as shown in the figure, the main circuit current is cut off without being largely separated between the two contacts 1 and 2.
[0036]
FIG. 2 is a side cross-sectional view of a connecting portion between the movable electrode 6a and the operating rod 6b. This figure shows the configuration of the A portion surrounded by a broken line in FIG. The connecting member 5 that connects the movable electrode 6a and the operating rod 6b insulates the movable electrode 6a and the operating rod 6b during the closing, and the main circuit current flowing through the movable electrode 6a in the closed state is applied to the operating rod 6b. It prevents the inflow. As shown in the figure, the connecting member 5 is a disk-like member having a diameter larger than that of the movable electrode 6a and the operating rod 6b. In the direction crossing the axis of the operating rod 6b, the connecting member 5 is connected to the operating rod 6b. The projecting portion that projects over a predetermined length has a shape that is provided around the entire circumference. The overhang length of the overhang portion is set to a length exceeding the insulation creepage length required in a vacuum. Electrode member 6c provided integrally with the end portion of the movable electrode 6a as the connection side with such coupling member 5, the coupling member larger than 5, Bei recesses 6d on opposite sides of the said coupling member 5 Eteiru . The movable electrode 6a and the connecting member 5 are joined to each other so as to include the connecting member 5 in the recess 6d.
[0037]
In the switchgear configured as described above, when the movable contact 2 is pulled away from the fixed contact 1 in order to cut off the main circuit current, an arc discharge is generated between the contacts 1 and 2, and the high temperature in the arc is generated. By exposure, the surfaces of the contacts 1 and 2 are melted, and a part thereof becomes a metal vapor, and the liquid metal particles formed by gathering the metal vapor and the metal vapor gather between the contacts 1 and 2 and the peripheral member. Due to the pressure difference between them and the expansion force of the arc, it is scattered around and adheres to each member inside the vacuum vessel 11.
[0038]
Such deposition of metal vapor, also occurs on the surface of the connecting member 5 for connecting the movable electrode 6a and the operating rod 6b, the coupling member 5, Zhang Ri out the connection side of the operating rod 6b as described above And is included in a recess 6d provided in the electrode member 6c at the end of the movable electrode 6a, and the side of the connecting member 5 facing the main circuit switch is covered with the electrode member 6c. The peripheral edge of the recess 6d that faces the outer peripheral surface of the outer surface with a space acts as a ridge. Therefore, the outer peripheral surface of the connecting member 5 and the surface of the connecting member 5 that is connected to the operation rod 6b, that is, the surface that does not face the fixed contact 1 and the movable contact 2 are clean with little adhesion of the metal vapor. Kept in a state.
[0039]
The size of the connecting member 5 is set so that the overhang length of the overhang portion including the width of the outer peripheral surface exceeds the insulating creepage length required in a vacuum . As a result, a desired insulation creepage length between the movable electrode 6a and the operating rod 6b is secured with a good cleanliness with little adhesion of metal vapor, and good creepage insulation characteristics can be maintained for a long time. Can be maintained throughout. Therefore, the connecting member 5 can reliably achieve the effect of preventing the main circuit current from flowing into the operating rod 6b, and can prevent the occurrence of an accident associated with the inflow, thereby providing a highly reliable switch gear. It becomes possible.
[0041]
Next, a method for manufacturing the switch gear as described above will be described. Since each member constituting the switchgear is used in a high vacuum inside the vacuum vessel 11, degreasing cleaning using an organic solvent is performed after processing into each shape to maintain the cleanliness of the surface. Assemble in the state. The fixed contact 1 and the movable contact 2 are formed by processing an alloy containing copper as a main component into a desired shape, and joining them to the bus-side conductor 3 made of oxygen-free copper and the movable electrode 6a. The fixing member 9 is joined to the part. Since these joints are required to be able to conduct the main circuit current without loss and to have a strength that can withstand opening and closing operations, joining means such as brazing, welding, and screwing are employed. .
[0042]
Further, an operating rod 6b is joined to the other end of the movable electrode 6a via a connecting member 5 included in a recess 6d of the electrode member 6c . Further, a bellows 7 is provided in the middle of the operating rod 6b. Join the edges. The joint between the connecting member 5 and the movable electrode 6a and the operating rod 6b needs to be strong enough to withstand the opening / closing operation force. The joint surface of the connecting member 5 made of an insulator is metalized with an alloy containing molybdenum. High strength bonding is performed by brazing the processing portion, the movable electrode 6a, and the operation rod 6b. The joining of the movable electrode 6a and the electrode member 6c can be realized by brazing, welding, or screwing. The movable electrode 6a and the electrode member 6c can be configured as an integrally processed product.
[0043]
On the other hand, the vacuum vessel 11 is constituted by a container member that can be divided into a plurality of parts, and the bus-side conductor 3 and the load-side conductor 4 are attached to the support members 10a and 10b joined to predetermined positions of these members, and the operation rod 6b The other edge of the bellows 7 is joined to the attachment part, and further, both ends of the connection conductor 8 are joined to the fixed member 9 and the load side conductor 4 of the movable electrode 6b, and finally the heating furnace maintained at high vacuum. The container members are joined to each other. As a material of the vacuum vessel 11, a metal for a vacuum member such as stainless steel is used.
[0044]
The joining of the supporting members 10a and 10b to the container member constituting the vacuum vessel 11 and the joining of the bellows 7 are performed by metallizing the joining surfaces of the supporting members 10a and 10b and the bellows 7 as in the connecting member 5. This is realized by brazing the portion and the container member. In this joining, since it is required that a sealing degree higher than the joining strength is obtained, the brazing material is applied thickly and brazing is performed. In addition, the joints at both ends of the connection conductor 8 conduct the main circuit current without loss and reduce the stress generated in the load side conductor 4 due to the deformation of the connection conductor 8 following the displacement of the movable electrode 6b. It is desirable to join by screwing.
[0045]
Other reference embodiments and embodiments of the present invention will be described below with reference to the respective drawings. 3 to 6 show the configuration of the portion A shown in the vicinity of the connecting member 5 that is a characteristic part of the present invention, that is, surrounded by a broken line in FIG. 1, as in FIG. The configuration and operation of this part are the same as those in FIG.
[0049]
Reference form 2
Figure 3 is a side sectional view showing a configuration of a main part of the switchgear reference embodiment 2. In this switchgear, as in the reference embodiment of FIG. 2, an electrode member 6c that is larger than the connecting member 5 at the end of the movable electrode 6a on the connecting side with the connecting member 5 and has a recess 6d at the tip side. Are integrally joined, and a recess 5a is also provided on the end surface of the connecting member 5 on the connection side with the operation rod 6b. The movable electrode 6a and the connecting member 5 include the connecting member 5 in the recess 6d. Further, the connecting member 5 and the operating rod 6b are joined in such a manner that the recess 5a includes the end of the operating rod 6b.
[0050]
According to this configuration, the opposite side of the connecting member 5 to the main circuit switch is covered with the electrode member 6c, and the peripheral edge of the recess 6d functions as a ridge, so that the peripheral surface of the connecting member 5 and the operating rod 6b The adhesion of the metal vapor to the end surface on the connection side is suppressed, these surfaces are kept clean, and the length along the inner surface of the recess 5a provided in the connection member 5 is the insulation creepage distance, so that the small diameter The connecting member 5 can be used. Also in this embodiment, the movable electrode 6a and the electrode member 6c can be configured as an integrally processed product.
[0051]
Reference form 3
Figure 4 is a side sectional view showing a configuration of a main part of the switchgear of the reference embodiment 3. In this switchgear, the connecting member 5 that connects the movable electrode 6a and the operating rod 6b includes a plurality of projecting portions 5b, 5c, 5d arranged in parallel in the axial direction on the outer periphery of the cylindrical body as shown in the figure. It becomes the composition. The connecting member 5 is included in a recess (not shown) provided at the end of the movable electrode 6a, as in the reference embodiment of FIG.
[0052]
According to this configuration, the surfaces of the plurality of projecting portions 5b, 5c, 5d connected to the respective operation rods 6b remain as clean surfaces with less adhesion of metal vapor generated by the main circuit arc. As a result, a sufficient insulation creepage distance is secured, and good insulation characteristics can be obtained over a long period of time.
[0053]
Reference form 4
Figure 5 is a side sectional view showing a configuration of a main part of the switchgear of the reference embodiment 4. In this switchgear, the connecting member 5 that connects the movable electrode 6a and the operating rod 6b is configured as a cylindrical member having substantially the same diameter as the movable electrode 6a and the operating rod 6b. A plurality of projecting portions 5e, 5f arranged in parallel in the axial length direction are formed by joining the insulators forming the above. The connecting member 5 having the protruding portions 5e and 5f is included in a recess (not shown) provided at the end of the movable electrode 6a, as in the reference embodiment of FIG.
[0054]
According to this configuration, multiple projecting portions 5e, the surface of the connecting side of the operating rod 6b of the respective 5f is, remains as clean surface adhesion with less metal vapor generated by the main circuit arc, these surfaces A sufficient insulation creepage distance is ensured, good insulation characteristics can be obtained over a long period of time, and the projecting portions 5e and 5f are constituted by separate members from the connecting member 5, so that a combination of members having a simple shape Thus, a desired effect can be obtained. It should be noted that high strength is not required for the joint between the insulator forming the protruding portions 5e and 5f and the connecting member 5, and this joining can be realized by an appropriate means such as adhesion.
[0055]
Embodiment 1
FIG. 6 is a side sectional view showing a configuration of a main part of the switchgear according to the first embodiment of the present invention. In this switchgear, the connecting member 5 for connecting the movable electrode 6a and the operating rod 6b is configured as a cylindrical member having substantially the same diameter as the movable electrode 6a and the operating rod 6b. As shown in FIG. 5, the outer surface of the core material 5g is covered with a surface material 5h, and has a layer structure.
[0056]
The core material 5g is an insulator mainly composed of aluminum oxide (alumina), and the surface material 5h is, for example, an insulator mainly composed of silicon oxide, etc., which is rougher than the alumina constituting the core material 5g. Is formed with a thickness of 1 mm or less by an insulator having a small dense surface.
[0057]
According to this configuration, the metal vapor generated by the main circuit arc adheres to the surface material 5h of the connecting member 5, and the surface material 5h is an insulator having a small surface roughness as described above, and creeping failure The voltage is high and the amount of gas released from the inside is small. Therefore, the main circuit current can be effectively prevented from flowing into the operating rod 6b, and good insulation characteristics can be obtained. Further, since the roughness of the surface material 5h is small, the fouling substances adhering to the surface of the surface material 5h can be easily removed during the production, and the surface fouling accompanying the production can be reliably restored. As a result, an additional effect of reducing the incidence of defective products in the manufacturing stage and obtaining a highly reliable switch gear can be obtained.
[0058]
Embodiment 2
FIG. 7 is a side sectional view showing a configuration of a main part of the switchgear according to the second embodiment of the present invention. In this figure, unlike FIGS. 3-6, although the structure of the range substantially the same as FIG. 1 is shown, each member except the periphery of the connection member 5, ie, the B section enclosed with the broken line in the figure, is shown. The configuration is the same as that of the switchgear shown in FIG. 1, and the same or corresponding parts are denoted by common reference numerals, and detailed description thereof is omitted.
[0059]
The characteristic structure of this switchgear is that the outside of the connecting member 5 is connected between the connecting member 5 that connects the movable electrode 6a and the operating rod 6b and the main circuit switch that is opened and closed by the movement of the movable electrode 6a. The shielding member 14 is arranged in a surrounding manner. This shielding member 14 is a thin cylindrical body whose diameter is reduced on the side facing the main circuit switch, and is supported on the peripheral wall of the vacuum vessel 11 via a support rod 13, and a metal portion inside the vacuum vessel 11 There is no direct contact with them.
[0060]
According to this configuration, the metal vapor generated by the main circuit arc and directed to the connecting member 5 is caught by the shielding member 14 before reaching the connecting member 5, and the connecting member 5 is attached due to the adhesion of the metal vapor. It is possible to effectively suppress the temporal degradation of the creeping withstand voltage characteristic. The shielding member 14 may be made of either a conductor or an insulator, but when made of an insulator, the separation distance from the movable electrode 6b maintained at a high potential can be reduced, Metal vapor can be captured more effectively.
[0061]
Embodiment 3
FIG. 8 is a side sectional view showing the configuration of the main part of the third embodiment of the switchgear according to the present invention. This figure shows the configuration of part B in FIG. 7, and the configuration of other parts not shown in the figure is the same as in FIG.
[0062]
In the same manner as in FIG. 7 , this switchgear is provided between the connecting member 5 that connects the movable electrode 6a and the operating rod 6b and the main circuit switch that is opened and closed by the movement of the movable electrode 6a. The shielding member 14 is arranged in such a manner as to surround the outer side without contact with the metal part inside the vacuum vessel 11. The support rod 13 for supporting the shielding member 14 extends through the insulating support member 10c fixed to the peripheral wall of the vacuum vessel 11 and extends to the outside. Has been.
[0063]
According to this configuration, the metal vapor generated by the main circuit arc and directed to the connecting member 5 is captured by the shielding member 14 before reaching the connecting member 5. At this time, the shielding member 14 is maintained at the ground potential via the support rod 13, while a part of the metal vapor generated by the main circuit arc is generally ionized with a positive potential. The metal vapor is attracted to the shielding member 14 maintained at the ground potential, and is reliably captured on the surface thereof. Therefore, the amount of metal vapor attached to the connecting member 5 surrounded by the shielding member 14 can be more effectively reduced, and the temporal deterioration of the creeping pressure resistance characteristics can be effectively suppressed. In this embodiment, the configuration in which the shielding member 14 is grounded via the support rod 13 has been described. However, the shield member 14 may be connected to a constant potential portion having a negative potential via the support rod 13. The ionized metal vapor can be captured more effectively.
[0064]
【The invention's effect】
As described above in detail, in the switchgear according to the first aspect of the present invention, the connecting member made of an insulator for connecting the movable electrode and the operation member is provided on the outer surface of the outer surface of the core member having a smaller surface roughness than the core member. Since the connecting member is configured by covering with a surface material made of an insulator having a low surface roughness of the insulator, which is the metal vapor adhesion surface of the connecting member, the creepage breakdown voltage is high, and good insulating properties are obtained. is, for a long time it is possible to maintain a good insulating properties, is reliably prevented from flowing into the operating member of the main circuit current, it is possible to obtain high reliability.
[0071]
In the switchgear according to the invention of claim 2 , since the shielding member is disposed between the connecting member and the main circuit switch so as not to contact the metal portion inside the vacuum vessel, the switchgear is generated by the main circuit arc. The metal vapor can be captured by the shielding member and adhesion to the connecting member can be reduced. Deterioration of the insulation characteristics accompanying this adhesion can be suppressed, and good insulation characteristics can be maintained over a long period of time. It is possible to reliably prevent the current from flowing into the operation member.
[0072]
Furthermore, in the switchgear according to the invention of the second aspect , since the shielding member is connected to the constant potential portion outside the vacuum vessel and is kept at the ground potential or the negative potential, the metal vapor generated by the main circuit arc is supplied to the switchgear. The present invention has excellent effects, such as being able to catch on the shielding member more reliably, reducing adhesion to the connecting member, and more effectively preventing deterioration of the insulation characteristics associated with the adhesion.
[Brief description of the drawings]
1 is a side sectional view showing a configuration of a main part of the switchgear reference embodiment 1.
2 is a side sectional view of a connection portion between a movable electrode and an operating rod in the switch gear of FIG . 1 ;
3 is a side sectional view showing a configuration of a main part of the switchgear reference embodiment 2.
4 is a side sectional view showing a configuration of a main part of the switchgear of the reference embodiment 3.
5 is a side sectional view showing a configuration of a main part of the switchgear of the reference embodiment 4.
FIG. 6 is a side sectional view showing a configuration of a main part of the switchgear according to the first embodiment of the present invention.
FIG. 7 is a side sectional view showing a configuration of a main part of a switchgear according to a second embodiment of the present invention.
FIG. 8 is a side sectional view showing a configuration of a main part of a switchgear according to a third embodiment of the present invention.
FIG. 9 is a side sectional view showing a configuration of a main part of a conventional switch gear.
[Explanation of symbols]
1 fixed contact, 2 movable contact, 3 bus side conductor, 4 load side conductor, 5 connecting member, 5a recess, 5b-5f overhang, 5g core material, 5h surface material, 6a movable electrode,
6b Operation rod, 6c electrode member, 6d recess, 14 shielding member.

Claims (2)

  A main circuit switch that opens and closes the bus-side conductor and the load-side conductor by contact and separation of the movable electrode with respect to the fixed electrode, an operation member that transmits an operation force for the contact and separation to the movable electrode, the operation member and the movable electrode And a connecting member made of an insulator for connecting to the inside of a common vacuum vessel, and the connecting member has an outer surface having a surface roughness smaller than that of the core material on the outside of the core material made of the insulator. A switchgear comprising a layer structure covered with a surface material made of an insulator. A main circuit switch that opens and closes the bus-side conductor and the load-side conductor by contact and separation of the movable electrode with respect to the fixed electrode, an operation member that transmits an operation force for the contact and separation to the movable electrode, the operation member and the movable electrode And a connecting member made of an insulator for connecting the main circuit switch and the connecting member between the main circuit switch and the connecting member without contact with the metal portion inside the vacuum vessel. and Yes and the supported part to be fixed an insulating material of the vacuum container, the switchgear, characterized in that it comprises a shield member connected to the external constant potential portion of the vacuum container.

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