JP2011054504A - Vacuum valve and tap switching device for gas insulation load - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum valve which allows use in high pressure gas and a tap switching device for gas insulation load which is small sized and has high reliability suitable for the vacuum valve. <P>SOLUTION: The vacuum valve 2 is arranged inside a sealed container filled with insulation gas and includes a pair of electrodes 15a, 15b which can be opened; a movable side conductive stick 16b connected to the movable side electrode 15b; and a bellows 17 for urging action of the movable side electrode 15b, by retaining the vacuum state in the sealed container. A cylindrical movable side conductor guide 9 is arranged between the movable side conductive stick 16b and the bellows 17, airtightness is retained between the movable side conductor guide 9 and a movable side end plate 12b and between the movable side conductor guide 9 and the movable side conductive stick 16b, an airtight chamber 4 is formed by the bellows 17; the movable side conductor guide 9 and the movable side conductive stick 16b and the pressure in the air tight chamber 4 is retained to the pressure which is intermediate between the pressure of the insulation gas 6 and the pressure inside the sealed container. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a gas-insulated load tap changer used in a gas-insulated transformer using gas as an insulating medium, and a vacuum valve for opening and closing the current.

  In recent years, transformers installed in densely populated areas such as large cities have adopted gas-insulated transformers using nonflammable gas that does not cause fire, instead of conventional oil-filled transformers. Furthermore, despite the large power consumption in large cities, there is a demand for a large-capacity and small-sized device due to the problem of constraints such as the installation space of power devices. Therefore, in the case of a gas-insulated transformer, in order to reduce the internal insulation distance, it has become an absolute condition to enclose the insulating gas at a high pressure.

  Normally, a vacuum valve type load tap changer is attached to a gas insulation transformer. Here, the configuration of a conventional gas insulation load tap changer will be briefly described with reference to the drawings. .

  FIG. 9 is a schematic configuration diagram of a conventional gas-insulated load tap changer. In FIG. 9, the on-load tap changer 1 is hung from the cover 61 of the tank 60 that constitutes the outer periphery of the transformer 51 and attached to the tank 60. The transformer body 34 mainly includes an iron core 34a and a coil 34b wound around the iron core 34a.

  The on-load tap changer 1 includes a change-over switch 31 provided with a vacuum valve 2 that performs current switching, and a tap selector 32 that does not perform current switching.

  Here, FIG. 11 shows a schematic configuration diagram of the vacuum valve 2 that performs current switching of the switching switch 31.

  The on-load tap changer 1 is driven by transmitting the rotational force generated by the electric operation mechanism 39 attached to the outside of the tank 60 to the changeover switch 31 and the tap selector 32 via the transmission shaft 38. Since there is a large pressure difference between the high-pressure insulating gas 6 and the atmosphere outside the transformer 51, the on-load tap changer 1 is provided with a rotary seal portion 71 and a static pressure seal portion 72.

  Further, the switching switch 31 and the tap selector 32 are electrically connected, and the tap selector 32 is electrically connected to the transformer coil 34b.

  In the transformer 51, a high-pressure insulating gas 6 is enclosed in a tank 60 in order to reduce the insulation distance. Along with this, the on-load tap changer 1 itself is also placed under high pressure.

  For this reason, the vacuum valve 2 attached to the switching switch 31 receives a considerably high pressure from the outside with respect to the vacuum in the valve, and the life of the bellows 17 which is a seal portion of the external pressure is significantly reduced. .

  As a result, the life of the vacuum valve 2 itself is governed, and the electrical life of the on-load tap changer 1 is significantly reduced. Even in such a configuration, if the absolute pressure of the insulating gas 6 is about 0.2 MPa, the bellows 17 of the vacuum valve 2 can be used without taking any special measures in the configuration shown in FIG. Yes (see Patent Document 1).

  However, due to market demands for downsizing gas insulation equipment, it is necessary to further increase the pressure of the insulation gas 6, and countermeasures for the bellows 17 portion of the vacuum valve 2 have become necessary.

  Furthermore, in recent years, a gas-insulated transformer using nitrogen or carbon dioxide, which is a natural gas having a low load on the environment, has been required as the insulating gas 6. When using such a gas having a low environmental load, it is necessary to use it at a pressure higher than that of the SF6 gas conventionally used because of problems such as insulation performance. In some cases, the absolute pressure of the insulating gas 6 is required. There is a possibility that exceeds 1MPa.

  As a countermeasure against this, the switching switch 31 is separated from the transformer 51 including the tap selector 32 and provided with a switching switch chamber for making the pressure different from that of the transformer 51. And the insulating gas pressure sealed in the switchgear chamber is lower than that of the transformer.

  FIG. 10 shows a schematic configuration diagram of a typical gas-insulated load tap changer employing such a method.

  In the figure, reference numeral 34 denotes a transformer body, in which a high-pressure insulating gas 6 is sealed in a tank 60. Similarly, the transformer body 34 and the tap selector 32 of the on-load tap changer 1 are accommodated in the tank 60. Has been. The switching switch 31 is housed in a switching switch chamber 64. In the switching switch chamber 64, an insulating gas 6L having a pressure lower than that of the insulating gas 6 in the tank 60 is sealed, and a load tap switching switch is provided. One switching switch 31 is accommodated.

  The transformer tank 60 and the switching switch chamber 64 are separated from each other by an insulating barrier 130. The rotational driving force by the electric operation mechanism 39 is transmitted to the transmission shaft 38 and transmitted to the switching switch 31. The rotational driving force is also transmitted to the rotational transmission shaft 40 disposed between the switching switch 31 and the tap selector 32 and is transmitted to the tap selector 32.

  In the case of the on-load tap changer 1, as far as insulation is concerned, the change-over switch 31 requires insulation only between adjacent taps, while the tap selector 32 requires insulation between all taps. There are characteristics unique to the vessel.

  Therefore, if the switching switch 31 and the tap selector 32 are separated as described above, the pressure of the insulating gas 6L on the switching switch 31 side can be lowered.

  Therefore, with this configuration, the pressure applied to the bellows 17 of the vacuum valve 2 of the switching switch 31 can be about 0.2 MPa. For this reason, the lifetime of the bellows 17 for sealing the vacuum valve 2 can be made longer than that of the conventional configuration, and the electrical life of the on-load tap changer 1 itself can be improved.

JP-A-2-123715 Japanese Utility Model Publication No. 54-137863 JP-A-6-208820 JP 2006-187195 A JP 2002-280229 A

  However, the conventional gas-insulated load tap changer described above has the following problems to be solved.

  In the gas-insulated transformer on-load tap changer to which a high gas pressure is applied, the on-load tap changer 1 and the change-over switch 31 and the tap are tapped so that the pressure applied to the bellows 17 of the vacuum valve 2 is about 0.2 MPa. It is necessary to separate the selector 32.

  For this reason, another tank is required in addition to the tank for storing the transformer body. As a result, there is a problem that not only the transformer as a whole is increased in size but also the number of parts and internal connection work are increased, resulting in a decrease in production efficiency.

  In order to solve such a problem and suppress the increase in size of the entire transformer, it is possible to realize downsizing of the entire transformer by storing a tap changer during loading in a tank that stores the transformer winding. It becomes possible. For this reason, various proposals have been made so that the pressure of the insulating gas 6 is not applied to the bellows 17.

  FIG. 5 is a schematic configuration diagram showing a configuration of a vacuum valve in a conventional gas-insulated load tap changer shown in Patent Document 2, FIG. 6 in Patent Document 3, and FIGS. 7 and 8 in Patent Document 4. It is. In either case, an intermediate pressure chamber is provided outside the vacuum valve to disperse the pressure difference of the gas so that a high pressure is not applied to the bellows 17 portion.

  However, when the insulating gas 6 is used at 0.6 MPa or more, two bellows are not sufficient and it is necessary to use three or more bellows. Further, in the conventional method of providing the intermediate pressure chamber, the length in the longitudinal direction of the vacuum valve 2 is increased, and when a load tap changer is configured, the load changer of the oil-filled transformer is more However, there was a disadvantage that the size would be increased.

  Further, although not shown in Patent Document 5, a vacuum valve is molded with an insulating material, an intermediate pressure difference is provided between the vacuum valve and the mold member, and the gas pressure difference is dispersed to be applied to the bellows portion. It is devised so that high pressure is not applied.

  In any of the conventional methods for providing an intermediate pressure difference as described above, the length in the length direction of the vacuum valve becomes large, and when configuring a load tap changer, the oil-filled transformer is loaded. There existed a subject that it enlarged in comparison with a tap changer.

  The present invention has been proposed in order to solve the above-described problems of the prior art, a vacuum valve that can be used in a high-pressure gas by suppressing the pressure difference between the inner and outer surfaces of the bellows with a simple structure, and An object of the present invention is to provide a small and reliable tap changer at the time of gas insulation load to which this vacuum valve is applied.

  In order to achieve the above object, a vacuum valve according to the present invention is a vacuum valve disposed in an airtight container filled with an insulating gas, and both ends of an insulating cylinder are separated by a fixed side end plate and a movable side end plate. A pair of electrodes, which are composed of a movable electrode and a stationary electrode, are arranged in an insulating container that is hermetically sealed and maintained in a vacuum state. The movable electrode is connected to one end of the movable conductive rod. And a bellows for connecting the other end of the movable conductive bar to an operating mechanism provided outside the insulating container and enabling the movable conductive bar to operate while maintaining a vacuum state in the insulating container. In the vacuum valve provided, the bellows is disposed on an outer peripheral side of the movable conductive rod in the insulating container, and one end of the bellows is hermetically joined to an outer peripheral surface of the movable conductive rod, and the other end of the bellows Is airtight to the movable side end plate of the insulating container A cylindrical movable-side conductor guide is disposed between the outer peripheral side of the movable-side conductive rod and the inner peripheral side of the bellows, and a sealant is provided between the movable-side conductive rod and the movable-side conductor guide. An annular hermetic chamber is formed by the bellows, the movable side conductive rod, and the movable side conductor guide, and the pressure in the hermetic chamber is intermediate between the pressure of the insulating gas and the pressure in the insulating container. It is characterized by being held at pressure.

  The vacuum valve according to the present invention is a vacuum valve disposed in a sealed container filled with an insulating gas, and is configured by sealing both ends of an insulating cylinder with a fixed side end plate and a movable side end plate. A pair of electrodes, which are movable and fixed electrodes, which are movable and fixed to each other, are arranged in an insulating container in which a vacuum state is maintained, and the movable electrode is connected to one end of the movable conductive bar and movable. A vacuum valve comprising: a bellows for connecting the other end of the side conductive rod to an operating mechanism provided outside the insulating vessel and enabling the movable side conductive rod to operate while maintaining a vacuum state in the insulating vessel; The bellows is disposed on the outer peripheral side of the movable conductive rod in the insulating container, one end of the bellows is hermetically joined to the outer peripheral surface of the movable conductive rod, and the other end of the bellows is connected to the insulating container. The movable side is hermetically joined to the movable side end plate. A cylindrical movable conductor guide is disposed between the outer peripheral side of the electric rod and the inner peripheral side of the bellows, and the outer peripheral surface of the movable conductive rod is between the movable conductive rod and the movable conductor guide. A cylindrical sliding guide formed smoothly from the outer peripheral surface is inserted, and a seal material is interposed between the movable side conductor guide and the sliding guide, and the bellows and the sliding guide, respectively. An annular hermetic chamber is formed by the bellows, the sliding guide, and the movable conductor guide, and the pressure in the hermetic chamber is maintained at a pressure intermediate between the pressure of the insulating gas and the pressure in the insulating container. Features.

  The vacuum valve according to the present invention is a vacuum valve disposed in a sealed container filled with an insulating gas, and is configured by sealing both ends of an insulating cylinder with a fixed side end plate and a movable side end plate. A pair of electrodes, which are movable and fixed electrodes, which are movable and fixed to each other, are arranged in an insulating container in which a vacuum state is maintained, and the movable electrode is connected to one end of the movable conductive bar and movable. A vacuum valve comprising: a bellows for connecting the other end of the side conductive rod to an operating mechanism provided outside the insulating vessel and enabling the movable side conductive rod to operate while maintaining a vacuum state in the insulating vessel; The bellows is disposed on the outer peripheral side of the movable conductive rod in the insulating container, one end of the bellows is hermetically joined to the outer peripheral surface of the movable conductive rod, and the other end of the bellows is connected to the insulating container. The insulation cylinder is axially joined to the end plate. A cylindrical sliding guide whose outer peripheral surface is formed more smoothly than the outer peripheral surface of the movable conductive rod is joined to the outer peripheral portion of the movable conductive rod located outside, and along the outer peripheral side of the sliding guide. A cylindrical movable-side conductor guide extending outside the insulating cylinder is disposed, and a sealant is interposed between the sliding guide and the movable-side conductor guide, so that the bellows, the sliding guide, and the An annular hermetic chamber is formed by the movable-side conductor guide, and the pressure in the hermetic chamber is maintained at an intermediate pressure between the pressure of the insulating gas and the pressure in the insulating container.

  Moreover, the gas-insulated load tap changer according to the present invention includes any one of the above vacuum valves.

  As described above, in the present invention, an airtight chamber is formed in the inner space of the bellows portion in the insulating container of the vacuum valve, and the pressure in the airtight chamber is changed between the pressure of the insulating gas outside the insulating container and the inside of the insulating container. By using an intermediate pressure to the pressure in the outer space of the bellows part, the pressure of the surrounding high-pressure insulating gas is not directly applied to the bellows part of the vacuum valve, and the mechanical life is prevented from decreasing. At the same time, it is possible to increase the pressure of the surrounding insulating gas to increase the voltage.

The schematic block diagram of the vacuum valve of the tap changer at the time of the gas insulation load which concerns on the 1st Embodiment of this invention. The schematic block diagram of the vacuum valve of the tap changer at the time of the gas insulation load which concerns on the 2nd Embodiment of this invention. The schematic block diagram of the vacuum valve of the tap changer at the time of the gas insulation load which concerns on the 3rd Embodiment of this invention. The schematic block diagram of the vacuum valve of the tap changer at the time of the gas insulation load which concerns on the 4th Embodiment of this invention. The schematic block diagram of the vacuum valve of the tap switch at the time of the conventional gas insulation load. The schematic block diagram of the vacuum valve of the tap switch at the time of the conventional gas insulation load. The schematic block diagram of the vacuum valve of the tap switch at the time of the conventional gas insulation load. The schematic block diagram of the vacuum valve of the tap switch at the time of the conventional gas insulation load. The schematic block diagram of the conventional tap changer at the time of a gas insulation load. The block diagram which made the switching switch another pressure in the conventional tap switch at the time of a gas insulation load. The schematic block diagram of the vacuum valve of the tap switch at the time of the conventional gas insulation load.

  Hereinafter, typical embodiments for carrying out the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected about the same or similar part as a prior art, and duplication description is abbreviate | omitted.

(First embodiment)
FIG. 1 shows a schematic configuration diagram of a vacuum valve applied to a gas-insulated load tap changer according to the first embodiment of the present invention. The entire configuration is shown in FIG. Since the configuration is the same as that shown in FIG.

  Here, the vacuum valve 2 is accommodated in the sealed container 68 of the switching switch 31 filled with the insulating gas 6 in FIG.

  A fixed-side end plate 12a is provided at one end (the left end in FIG. 1) of the insulating cylinder 11, and a fixed-side electrode 15a is attached in the vacuum chamber 3 of the fixed-side conductive rod 16a fixed to the fixed-side end plate 12a. It has been. A movable end plate 12b is provided at the other end (right end in FIG. 1) of the insulating cylinder 11, and a bellows 17 is provided at the outer periphery of the movable conductive bar 16b. One end of the bellows 17 is hermetically connected to the movable side end plate 12b and the other end is hermetically connected to the movable side conductive rod 16b.

  Further, the movable side conductive rod 16b is provided with a movable side electrode 15b facing the fixed side electrode 15a, and both the electrodes 15a and 15b are accommodated in the vacuum chamber 3 of the vacuum valve 2 thus configured. ing.

  On the other hand, on the outer peripheral side of the movable side conductive rod 16b, a movable side conductor guide 9 having a cylindrical shape and having a flange at one end is provided. The movable-side conductor guide 9 has a flange portion fixed to a guide presser 10 formed on the movable-side end plate 12b by brazing or screwing.

  Here, a seal member 22a is interposed between the movable conductor guide 9 and the movable end plate 12b, and the outer peripheral side of the movable side conductive rod 16b and the inner peripheral side of the cylindrical portion of the movable side conductor guide 9. Between the sides, seal materials 22b and 22c made of, for example, EP rubber are inserted, and are surrounded by the inner side of the bellows 17, the outer peripheral side of the movable conductive bar 16b, and the movable conductor guide 9. The airtight chamber 4 is formed in the space, and the movable side conductive rod 16b is slidably led out to the external space of the airtight chamber 4 while maintaining airtightness with the movable side conductor guide 9.

  Therefore, the hermetic chamber 4 formed in the inner space of the bellows 17 is completely separated from the atmosphere of the insulating gas 6 around the vacuum valve 2. The movable side conductive rod 16b led out of the hermetic chamber 4 through the seal members 22b and 22c is electrically connected to the main circuit via a current collector (not shown), and the movable side conductive rod 16b has An operating device (not shown) is connected. The vacuum valve 2 configured in this manner is used by being installed in a sealed container 68 in which a high-pressure insulating gas 6 is sealed as shown in FIG. 9, for example. In the figure, the operation mechanism of the vacuum valve 2 in the sealed container 68 is not shown.

  As the movable conductor guide 9 is inserted inside the bellows 17 of the vacuum valve 2 in this way, the vacuum pressure in the vacuum chamber 4 acts on the outside of the bellows 17. The high-pressure insulating gas 6 in the external space can be prevented from acting.

  Therefore, by sealing air or gas having an intermediate pressure between the pressure of the insulating gas 6 and the vacuum pressure of the vacuum chamber 3 in the hermetic chamber 4, the pressure difference acting on the inner and outer surfaces of the bellows 17 can be made smaller than before. , Its mechanical life can be improved.

  Further, if the same mechanical life is expected, a gas-insulated-load tap changer with improved insulation performance can be realized by increasing the pressure of the insulating gas filled in the sealed container that accommodates the whole.

  Further, in this embodiment, an airtight chamber is formed in the vacuum chamber inner space of the vacuum valve surrounded by the insulating cylinder and the end plate, so that the total length of the vacuum valve is the same length as the conventional vacuum valve in the space. It becomes possible to comprise.

  Furthermore, in the unlikely event that the insulating gas 6 leaks into the hermetic chamber 4, the leaked gas is adsorbed through the gas adsorbent 29 such as zeolite in the hermetic chamber 4, so that the bellows of the vacuum valve 2 can be obtained. It is possible to prevent a pressure difference of 0.1 MPa or less from being applied to the 17 portion, and the pressure difference acting on the inner and outer surfaces of the bellows 17 can be made smaller than in the case of a conventional gas-insulated transformer. It is possible to provide a gas-insulated load tap changer that is small and has long-term reliability.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to the drawings.

  FIG. 2 is a schematic configuration diagram of a vacuum valve applied to a gas-insulated load tap changer according to the second embodiment of the present invention. Since the configuration of the vacuum valve 2 is substantially the same as that of the first embodiment shown in FIG. 1 except for the main part, the same reference numerals are given to the parts common to FIG. 1 and the detailed description is omitted. Only different configurations will be described.

  In the present embodiment, the movable conductive rod 16b extends from the inside of the hermetic chamber 4 formed inside the bellows 17 to the outside of the hermetic chamber 4 on the outer peripheral side of the movable conductive rod 16b and on the inner peripheral side of the movable conductor guide 9. A cylindrical sliding guide 7 extending along the axial direction is inserted.

  The outer peripheral surface of the sliding guide 7 is formed in a smooth surface state, and a sliding guide presser 8 whose inner peripheral side is threaded is provided on a threaded portion provided on the outer peripheral side of the movable conductive rod 16b. It is fastened and fixed from the axially opposite electrode side of the movable conductive bar 16b.

  As the sliding guide 7, for example, stainless steel or iron coated with DLC (diamond-like carbon), tungsten, titanium or the like can be used.

  The sliding guide 7 fastened by the sliding guide presser 8 comes into contact with the bellows 17 through the seal material 22d and is gas-sealed. Furthermore, the movable side conductor guide 9 is fixed to a guide presser 10 provided on the movable side end plate 12 b by a screw 13.

  Here, in order to maintain a high vacuum in the vacuum valve 2, the movable conductive bar 16b is provided with an insulating cylinder 11, a fixed side end plate 12a, a movable side end plate 12b, a fixed side end plate 12a, a fixed side electrode 16a, a movable side. The side conductive rod 16b and one end of the bellows 17 are hermetically joined by brazing or the like. At this time, it is necessary to devise a protection method for keeping the surface roughness of the movable conductive bar 16b smooth so that the friction is reduced when sliding. In particular, a rubber-like organic material is preferable in order to prevent collision between metals. However, when the movable conductive bar 16b and the bellows 17 are joined by brazing, the rubber-like organic material is used during brazing. It is not practical because it burns and sticks around. For this reason, it is performed by the conventional process until the vacuum valve 2 is brought to a high vacuum, and thereafter, the movable side conductor guide 9 having a smooth inner surface and the sliding guide 7 having a smooth outer surface are attached. .

  Thus, in the present embodiment, the cylindrical sliding guide 7 having a smooth outer peripheral surface is attached and fixed to the outer peripheral surface of the movable conductive rod 16b, and the outer peripheral side of the sliding guide 7 is fixed. By disposing the sealing materials 22b and 22c on the inner peripheral side of the movable side conductor guide 9, friction during sliding of the movable side conductive rod 16b and intrusion of the insulating gas 6 into the hermetic chamber 4 can be prevented. The pressure rise in 4 can be suppressed.

(Third embodiment)
FIG. 3 is a schematic configuration diagram of a vacuum valve applied to a gas-insulated load tap changer according to a third embodiment of the present invention. Since this shows a modification of the vacuum valve of the second embodiment shown in FIG. 2, the same parts as those in FIG. Only will be described.

  The movable-side conductor guide 9 has a double cylindrical shape in which one end of the cylindrical portion is folded inward at the outer peripheral portion of the movable-side conductive rod 16b, and the seal member 22b is formed on the inner peripheral side of the inner cylinder. Airtightness in the airtight chamber 4 is maintained by being arranged so as to contact the movable conductive bar 16b via 22c.

  According to the present embodiment described above, the force due to the pressure of the insulating gas 6 is applied so as to push the gap between the double cylindrical portions of the movable conductor guide 9. By doing so, the airtightness of the movable side conductor guide 9 and the movable side conductive rod 16b becomes better as the pressure of the insulating gas 6 is higher, so that the pressure increase in the hermetic chamber 4 can be suppressed.

(Fourth embodiment)
FIG. 4 is a schematic configuration diagram of a vacuum valve applied to a gas-insulated load tap changer according to a fourth embodiment of the present invention. Since this shows a modification of the vacuum valve of the second embodiment shown in FIG. 2, the same parts as those in FIG. Only will be described.

  In the present embodiment, the axial length of the cylindrical sliding guide 7 shown in FIG. 2 is shortened, and the end surface of the sliding guide 7 is formed around the movable conductive bar 16b to form a brazing portion 18. Airtight and fixed. Further, in the present embodiment, a collar portion formed at one end of the movable side conductor guide 9 is attached and fixed to the movable side end plate 12b, and the cylindrical portion is a shaft of the movable side conductive rod 16b with respect to the hermetic chamber 4 of the vacuum valve 2. As a configuration extending toward the direction counter electrode, seal materials 22b and 22c are interposed between the movable conductor guide 9 and the sliding guide 7 to keep the airtightness.

  As described above, the cylindrical portion of the movable conductor guide 9 is configured to extend outward with respect to the hermetic chamber 4 of the vacuum valve 2, so that the force generated by the pressure of the insulating gas 6 is the same as in the third embodiment. Is added in the direction in which the movable conductor guide 9 is compressed.

  By configuring in this way, the airtightness of the movable conductor guide 9 and the movable conductive rod 16b becomes better as the pressure of the insulating gas 6 is higher, so that an increase in pressure in the hermetic chamber 4 can be suppressed.

  In the present embodiment as well, as in the first embodiment, an insulating gas that slightly leaks into the hermetic chamber can be adsorbed by interposing a gas adsorbent mainly composed of zeolite or the like in the hermetic chamber. Therefore, the same effect as in the first embodiment can be obtained.

1 ... tap changer when loaded, 2 ... vacuum valve,
3 ... Vacuum chamber, 4 ... Airtight chamber,
5 ... Air chamber 6, 6L ... Insulating gas,
7 ... Cylindrical sliding guide, 8 ... Sliding guide holding screw,
9 ... movable side conductor guide, 10 ... guide presser,
11 ... Insulating tube, 12a ... Fixed end plate,
12b ... movable side end plate, 13 ... screw,
15a: fixed electrode, 15b: movable electrode,
16a: fixed conductive bar, 16b: movable conductive bar,
17 ... Bellow, 18 ... Brazing part,
22a, 22b, 22c, 22d ... seal material,
31 ... Switching switch, 32 ... Tap selector,
34 ... Transformer body 34a ... The main component is an iron core,
34b ... coil, 38 ... transmission shaft,
39 ... Electric operation mechanism, 51 ... Transformer,
60 ... tank, 61 ... cover,
69 ... Sealed container, 71 ... Rotating seal part,
72… Static pressure seal

Claims (7)

A vacuum valve disposed in a sealed container filled with insulating gas,
A pair of electrodes, which are configured by sealing both ends of an insulating cylinder with a fixed-side end plate and a movable-side end plate, and are made of a movable-side electrode and a fixed-side electrode in an insulating container in which a vacuum state is maintained. The movable side electrode is connected to one end of the movable side conductive rod, and the other end of the movable side conductive rod is connected to an operation mechanism provided outside the insulating container, so that the vacuum state in the insulating container is changed. In a vacuum valve provided with a bellows that enables operation of the movable conductive rod while being held,
The bellows is disposed on an outer peripheral side of the movable conductive rod in the insulating container, one end of the bellows is hermetically joined to an outer peripheral surface of the movable conductive rod, and the other end of the bellows is movable on the insulating container. A cylindrical movable side conductor guide is disposed between the outer peripheral side of the movable side conductive rod and the inner peripheral side of the bellows.
An annular hermetic chamber is formed by the bellows, the movable side conductive rod, and the movable side conductor guide, with a sealant interposed between the movable side conductive rod and the movable side conductor guide, A vacuum valve characterized in that the pressure is maintained at an intermediate pressure between the pressure of the insulating gas and the pressure in the insulating container. A vacuum valve disposed in a sealed container filled with insulating gas,
A pair of electrodes, which are configured by sealing both ends of an insulating cylinder with a fixed-side end plate and a movable-side end plate, and are made of a movable-side electrode and a fixed-side electrode in an insulating container in which a vacuum state is maintained. The movable side electrode is connected to one end of the movable side conductive rod, and the other end of the movable side conductive rod is connected to an operation mechanism provided outside the insulating container, so that the vacuum state in the insulating container is changed. In a vacuum valve provided with a bellows that enables operation of the movable conductive rod while being held,
The bellows is disposed on an outer peripheral side of the movable conductive rod in the insulating container, one end of the bellows is hermetically joined to an outer peripheral surface of the movable conductive rod, and the other end of the bellows is movable on the insulating container. A cylindrical movable side conductor guide is disposed between the outer peripheral side of the movable side conductive rod and the inner peripheral side of the bellows.
A cylindrical sliding guide having an outer peripheral surface formed more smoothly than the outer peripheral surface of the movable conductive rod is interposed between the movable conductive rod and the movable conductive guide, and the movable conductive guide and the sliding are inserted. An annular hermetic chamber is formed by the bellows, the sliding guide, and the movable conductor guide, with a sealant interposed between the guide and the bellows and the sliding guide, respectively. A vacuum valve characterized in that the pressure is maintained at an intermediate pressure between the pressure of the insulating gas and the pressure in the insulating container.   The movable side conductor guide has a double cylindrical structure formed by bending one end of a cylinder inward, and a sealant is interposed between the inner cylindrical portion of the movable side conductor guide and the movable side conductive rod, 2. The vacuum valve according to claim 1, wherein an annular hermetic chamber is formed by a bellows, a movable side conductive rod, and a movable side conductor guide.   The movable side conductor guide has a double cylindrical structure formed by bending the cylinder inward, and a bellows part, a sliding guide, and a movable part are interposed between the inner cylindrical part and the sliding guide. The vacuum valve according to claim 2, wherein an annular hermetic chamber is formed by the side conductor guide. A vacuum valve disposed in a sealed container filled with insulating gas,
A pair of electrodes, which are configured by sealing both ends of an insulating cylinder with a fixed-side end plate and a movable-side end plate, and are made of a movable-side electrode and a fixed-side electrode in an insulating container in which a vacuum state is maintained. The movable side electrode is connected to one end of the movable side conductive rod, and the other end of the movable side conductive rod is connected to an operation mechanism provided outside the insulating container, so that the vacuum state in the insulating container is changed. In a vacuum valve provided with a bellows that enables operation of the movable conductive rod while being held,
The bellows is disposed on the outer peripheral side of the movable conductive rod in the insulating container, one end of the bellows is hermetically joined to the outer peripheral surface of the movable conductive rod, and the other end of the bellow is the end of the insulating container. Airtightly bonded to the board,
A cylindrical slide guide whose outer peripheral surface is formed more smoothly than the outer peripheral surface of the movable conductive rod is joined to the outer peripheral portion of the movable conductive rod located outside the insulating cylinder in the axial direction. A cylindrical movable side conductor guide extending outside the insulating tube along the outer peripheral side of the bellows, with a sealant interposed between the sliding guide and the movable side conductor guide, A vacuum valve characterized in that an annular hermetic chamber is formed by a sliding guide and the movable conductor guide, and the pressure in the hermetic chamber is maintained at a pressure intermediate between the pressure of the insulating gas and the pressure in the insulating container. .   The vacuum valve according to any one of claims 1 to 5, wherein an adsorbent that adsorbs the insulating gas is interposed in the hermetic chamber.   A gas-insulated load tap changer comprising the vacuum valve according to any one of claims 1 to 6.

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