JP2018147643A - Vacuum circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce, without increasing the weight and size of a vacuum circuit breaker, the deflection of a housing of an operating mechanism part by reducing stress due to shock and vibration associated with an opening and closing operation of the vacuum circuit breaker so that reliability with respect to the opening and closing operation can be improved.SOLUTION: A vacuum circuit breaker includes: a vacuum valve in which at least a fixed side electrode and a movable side electrode are stored and the periphery of which is covered with a mold part; and an operating mechanism part to drive the movable side electrode. The vacuum valve and the operating mechanism part are disposed on a straight line, and there is provided a fixing member stretched over the mold part of the vacuum valve and the operating mechanism part to fix the mold part and the operating mechanism part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vacuum circuit breaker, and more particularly to a vacuum circuit breaker suitable for a mold vacuum valve in which a vacuum valve is molded with a solid insulator.

  As a prior art regarding a vacuum circuit breaker, there exists what was described in patent document 1. FIG. This Patent Document 1 discloses a switchgear component device and a switchgear configuration as a sealed switchgear that houses a switchgear including a valve such as a vacuum circuit breaker or a vacuum disconnector in a switchgear and constitutes a power supply system. A switchgear that includes a plurality of components including an insulating part for insulating equipment and a joint part for joining switchgear components in a vertical direction, and that joins the plurality of components in a vertical direction is described. .

JP 2003-333715 A

  The switch gear of Patent Document 1 described above is equipped with a vacuum circuit breaker to which a mold vacuum valve is applied with a vacuum valve covered with a solid insulator, but the mold vacuum valve is in contact with only the top plate of the operation chamber. It has become. That is, the mold vacuum valve is fixed at a position where the mold vacuum valve is in contact with the top plate of the operation mechanism unit. Specifically, a fixing part such as a nut or a bolt is embedded in a mold part that is in contact with the top plate of the operation mechanism unit, and the fixing part is fixed to the top plate of the operation mechanism unit.

  However, in the configuration of Patent Document 1, there is a concern that the bolts or nuts are loosened due to impact or vibration during the operation of the operating mechanism, that is, the opening / closing operation of the vacuum circuit breaker, and the opening / closing operation is not stable. . There is also a concern that the shock of the opening / closing operation of the vacuum circuit breaker may cause bending of the casing of the operation mechanism unit, resulting in a decrease in the opening / closing operation speed.

  As countermeasures for this, it is conceivable to increase the fastening force of the fixed parts by increasing the size of the bolt or nut, or to increase the plate thickness of the casing of the operation mechanism section to suppress bending. However, there is a problem that the weight and size of the vacuum circuit breaker increase.

  The present invention has been made in view of the above points, and the object of the present invention is to reduce the stress caused by shock and vibration associated with the opening / closing operation of the vacuum circuit breaker without increasing the weight and size of the vacuum circuit breaker. An object of the present invention is to provide a vacuum circuit breaker that can reduce the bending of the casing of the operation mechanism and improve the reliability of the opening / closing operation.

  In order to achieve the above object, a vacuum circuit breaker according to the present invention includes a vacuum valve in which at least a fixed side electrode and a movable side electrode are housed and covered with a mold part, and an operation mechanism for driving the movable side electrode. A vacuum breaker comprising: a vacuum valve and the operation mechanism portion arranged in a straight line; and a fixing member for fixing both of the vacuum valve mold portion and the operation mechanism portion. It is characterized by having.

  According to the present invention, without increasing the weight or size of the vacuum circuit breaker, the stress due to shock or vibration associated with the opening / closing operation of the vacuum circuit breaker is reduced, the bending of the housing of the operation mechanism unit is reduced, and the opening / closing operation is prevented. Reliability can be improved.

It is a fragmentary sectional view which shows Example 1 of the vacuum circuit breaker of this invention. It is a fragmentary sectional view which shows Example 2 of the vacuum circuit breaker of this invention. It is a fragmentary sectional view which shows Example 3 of the vacuum circuit breaker of this invention. It is a fragmentary sectional view which shows Example 4 of the vacuum circuit breaker of this invention. It is a figure which shows the Paschen curve showing the relationship between the pressure in the vacuum vessel in Example 4 of the vacuum circuit breaker of this invention, and a discharge start voltage. FIG. 6 is a view showing Example 5 of the vacuum circuit breaker of the present invention and corresponding to a cross section taken along line AA ′ of FIG. 2. It is a fragmentary sectional view which shows Example 6 of the vacuum circuit breaker of this invention.

  Hereinafter, the vacuum circuit breaker of the present invention will be described based on the illustrated embodiment. In addition, in each Example, the same code | symbol is used for the same component.

  FIG. 1 shows a first embodiment of the vacuum circuit breaker of the present invention.

  As shown in the figure, the vacuum circuit breaker 30A of this example is formed by integrally casting (molding) with a solid insulator such as an epoxy resin (the periphery is covered with a mold part 1A), A fixed cable bushing 2 in which the periphery of the fixed cable bushing conductor 15 is molded, a movable cable bushing 3 in which the periphery of the movable cable bushing conductor 16 is molded, and a movable electrode 13 to be described later are provided. An operation mechanism unit 4 to be operated is schematically configured. Usually, the vacuum valve 1 integrally cast with a solid insulator such as an epoxy resin is called a mold vacuum valve. Although not particularly illustrated, the mold part is normally grounded.

The vacuum valve 1 described above is bonded to the fixed side end plate 6 bonded to one end of the cylindrical insulating material 5, the fixed side conductor 7 penetrating the fixed side end plate 6 in an airtight manner, and the other end of the cylindrical insulating material 5. One end is joined to the movable end plate 8, the bellows-shaped bellows 9 that allows the movable portion to be driven, and the bellows 9 is hermetically penetrated and driven in the axial direction while maintaining a vacuum. It is comprised from the movable side conductor 10, The internal pressure is kept at the vacuum of about 10 ^<-2 > Pa or less.

  Inside the vacuum valve 1, the floating potential metal 11 supported by the cylindrical insulating material 5, the fixed side electrode 12 connected to the end of the fixed side conductor 7, and the end of the movable side conductor 10 are connected. The movable side electrode 13 is disposed.

  The movable conductor 10 is connected to an operation insulating rod 14, and the operation insulating rod 14 is housed in the operation mechanism unit 4 and connected to an operating device connected to a wipe mechanism that applies a contact load to the electrode pair. The space surrounding the operating insulating rod 14 is filled with an insulating gas 18 such as air or sulfur hexafluoride.

  In addition, the movable side electrode 13 is driven through the operation insulating rod 14 in conjunction with the driving of the operating unit (not shown), so that the fixed side electrode 12 and the movable side electrode 13 are contacted and separated, that is, the vacuum valve 1 is opened. The state and the closed state can be switched. In addition, the vacuum valve 1 of FIG. 1 has shown the open state.

  The fixed cable bushing 2 electrically connects the fixed cable bushing conductor 15 to the fixed conductor 7 of the vacuum valve 1, and the movable cable bushing 3 connects the movable cable bushing conductor 16 to the vacuum valve 1. The movable side conductor 10 and the movable side cable bushing conductor 16 of the vacuum valve 1 can be slidably energized by being placed on the movable side and integrally cast with a solid insulator such as epoxy resin together with the vacuum valve 1. It is electrically connected via a contact 17, and a power-side cable and a load-side cable (not shown) are connected to the fixed-side cable bushing 2 and the movable-side cable bushing 3, respectively, so that it can be operated.

  In this embodiment, the vacuum valve 1 and the operation mechanism unit 4 are arranged on a substantially straight line, and straddle the mold unit 1A and the operation mechanism unit 4 around the vacuum valve 1 so as to fix them together. It has the structure which has the fixing member 19 to do.

  Specifically, the vacuum valve 1 side of the fixing member 19 is formed integrally with a plurality of mold overhang portions (inserted with the mold portion 1A) in which insert nuts provided so as to protrude outside the side surface of the mold portion 1A of the vacuum valve 1 are embedded. 20a and 20b are fixed with bolts 21a and 21b as fastening means, and the operation mechanism section 4 side of the fixing member 19 is directly fixed to the casing of the operation mechanism section 4 with bolts 21c and 21d as fastening means. (The operating mechanism unit 4 does not have an overhanging portion, but may be provided).

  The vacuum circuit breaker 30A of the present embodiment configured as described above is also subjected to the driving force of the operation mechanism unit 4, that is, the stress due to the impact or vibration by the opening / closing operation of the vacuum circuit breaker 30A. Can be dispersed. In other words, the mold part 1A of the vacuum valve 1 and the casing of the operation mechanism part 4 are fixed at a plurality of locations by the bolts 21a, 21b, 21c, and 21d through the fixing member 19, so that the vacuum circuit breaker 30A can be opened and closed. The stress caused by the impact and vibration can be distributed at each fixed part.

  As a result, it is possible to reduce the occurrence of loosening of bolts 21a, 21b, 21c, 21d and nuts for fixing the molded vacuum valve 1 and the operation mechanism unit 4, and to suppress the bending of the operation mechanism unit 4, The vacuum circuit breaker 30A on which the vacuum valve 1 or the molded vacuum valve 1 is mounted can be reduced in size, and the reliability of the vacuum circuit breaker 30A for the opening / closing operation can be improved.

  FIG. 2 shows a second embodiment of the vacuum circuit breaker according to the present invention. Note that a description of the same parts as those in the first embodiment will be omitted.

  The vacuum circuit breaker 30 </ b> B according to the present embodiment shown in the figure has a configuration in which the fixing member 19 extends over the mold part 1 </ b> A and the operation mechanism part 4 around the vacuum valve 1 at a plurality of positions.

  That is, a plurality of fixing members 19 are arranged, and each of the fixing members 19a and 19b extends across the mold part 1A of the vacuum valve 1 and the operation mechanism part 4 and protrudes from the side surface of the mold part 1A of the vacuum valve 1. Are fixed to bolts 21a, 21b, 21c, and 21d, which are fastening means, to the casings of the mold overhanging portions 20a and 20b and the operation mechanism unit 4. Other configurations are the same as those of the first embodiment.

  The vacuum circuit breaker 30B of the present embodiment configured as described above receives the driving force of the operating device, that is, the stress caused by the impact and vibration generated by the opening / closing operation of the vacuum circuit breaker 30B, by the two fixing members 19a and 19b. Therefore, since the stress received by one fixing member 19 can be made smaller than that in the first embodiment, the bolts 21a, 21b, 21c for fixing the molded vacuum valve 1 and the housing of the operation mechanism unit 4 are fixed. The occurrence of 21d and nut loosening or the bending of the operation mechanism unit 4 can be suppressed from the first embodiment, and the opening / closing operation of the molded vacuum valve 1 or the vacuum circuit breaker 30B equipped with the molded vacuum valve 1 is implemented. The reliability with respect to can be further improved.

  FIG. 3 shows a third embodiment of the vacuum circuit breaker according to the present invention. Note that a description of the same parts as those in the first embodiment will be omitted.

  In the vacuum circuit breaker 30 </ b> C of the present embodiment shown in the figure, the fixing member 19 is also arranged on the side surface of the fixed side cable bushing 2 located on the opposite side to the operation mechanism unit 4.

  That is, the fixing member 19 extends in the axial direction and bends approximately 90 degrees inward at a position beyond the fixed-side cable bushing 2, and the bent fixing member 19 ′ surrounds the fixed-side cable bushing 2. It is fixed to a mold overhanging portion 20c in which an insert nut provided in the covering mold portion is embedded with a bolt 21e as a fastening means. Other configurations are the same as those of the first embodiment.

  The fixing member 19 extends in the axial direction and intersects the fixed-side cable bushing 2. This can be achieved by providing a through-hole through which the fixing member 19 can pass through the fixed-side cable bushing 2. Further, the fixing member 19 does not intersect with the fixed cable bushing 2 and can be arranged avoiding the fixed cable bushing 2.

  The vacuum circuit breaker 30C of the present embodiment configured as described above has a fixing member 19 'that is bent with respect to the driving force of the operating device, that is, the stress caused by the impact or vibration generated by the opening / closing operation of the vacuum circuit breaker 30C. Therefore, the bolt bolts 21a, 21b, 21c, 21d, 21e for fixing the molded vacuum valve 1 and the casing of the operation mechanism unit 4 and the occurrence of loosening of nuts, or The bending of the operation mechanism unit 4 can be suppressed as compared with the first embodiment, and the reliability of the molded vacuum valve 1 or the opening / closing operation of the vacuum circuit breaker 30C equipped with the molded vacuum valve 1 can be further improved. it can.

  In the present embodiment, the case where the number of the fixing members 19 is one is shown. However, when a plurality of the fixing members 19 are provided, it is obvious that the effect becomes more remarkable.

  FIG. 4 shows a fourth embodiment of the vacuum circuit breaker according to the present invention. Note that a description of the same parts as those in the first embodiment will be omitted.

  In the vacuum circuit breaker 30D of the present embodiment shown in the figure, as in the first embodiment, the vacuum valve 1 side of the fixing member 19 is fixed to the mold overhanging portion with bolts, and the operation mechanism portion 4 side of the fixing member 19 is operated Although it is directly fixed to the casing of the mechanism portion 4 by bolts 21c and 21d as fastening means, in this embodiment, the bolt 21a for fixing the fixing member 19 at the mold overhanging portion located around the floating potential metal 11 is The inspection bolt 22 for inspecting the pressure (vacuum degree) in the vacuum valve 1, and the inspection bolt 22 and the inspection insert nut 23 paired with the inspection bolt 22 are separated from the floating potential metal 11 by a predetermined distance. The fixing member 19 is fixed at a position separated from the fixing bolt 19, and the inspection bolt 22 and the inspection insert nut 23 are electrically insulated from the fixing member 19 via an insulating member 24.

  The inspection bolt 22 is connected to a pressure monitoring device 25 that detects an increase in the potential of the floating potential metal 11 when the pressure of the vacuum valve 1 increases, and the vacuum valve is detected from the detection signal detected by the pressure monitoring device 25. 1 is provided with a determination device 26 for determining the presence or absence of abnormality in the internal pressure.

  The pressure monitoring device 25 described above includes a connection line 25a connected to at least one of the inspection bolt 22 and the inspection insert nut 23, and the inspection bolt 22 and the inspection insert nut 23 via the connection line 25a. It consists of a plurality of insulators (for example, capacitors) 25b1 and 25b2 partially connected in series to at least one, and a potential measuring device 25c connected between the plurality of insulators 25b1 and 25b2. Among the plurality of insulators 25b1 and 25b2 connected to each other, an insulator 25b2 different from one insulator 25b1 located on the side closer to the inspection bolt 22 and the inspection insert nut 23 is a potential fixing point (ground). 25d.

  In the vacuum circuit breaker 30D of the present embodiment configured as described above, a potential is generated in the inspection bolt 22 when pressure deterioration occurs in the vacuum valve 1, and therefore the pressure monitoring device 25 is connected to the inspection bolt 22. Therefore, it is possible to monitor whether the internal pressure of the vacuum valve 1 is abnormal.

  Here, the pressure deterioration of the vacuum valve 1, that is, the case where the pressure inside the vacuum vessel increases will be described.

The pressure rise inside the vacuum vessel is mainly caused by gas permeation from the outside of the vacuum vessel, gas release from the internal member of the vacuum vessel, pinholes that rarely occur at the bellows 9 or joints, etc. as shown in the Paschen curve that represents the relationship between pressure and discharge start voltage in the vacuum chamber of Figure 5, and becomes more about 10 -1 ^Pa insulation performance begins to rapidly decrease.

  When the vacuum circuit breaker 30D equipped with the vacuum valve 1 is in a normal operation state, if the pressure rises in the vacuum valve 1 and the insulation performance deteriorates, the fixed conductor 7, the fixed electrode 12, the movable conductor 10, the movable Discharge occurs between the main circuit composed of the side electrodes 13 and the floating potential metal 11 that is electrically insulated from the main circuit.

  The potential of the floating potential metal 11 during normal operation in which no pressure increase occurs in the vacuum valve 1 includes the operating voltage, the structure of the vacuum valve 1, and a fixed potential member around the vacuum valve 1 (for example, a vehicle casing or floor). The potential of the floating potential metal 11 when a pressure increase occurs and a discharge occurs between the main circuit of the vacuum valve 1 and the floating potential metal 11 is determined during normal operation. It becomes a potential in which a discharge pulse is superimposed on the potential. Further, when the pressure rises, an increased discharge pulse is superimposed, and finally the potential of the floating potential metal 11 rises to a state close to the operating voltage.

  The potential increase of the floating potential metal 11 when the pressure increases is detected by the pressure monitoring device 25 connected to the inspection bolt 22, and the detection signal is output to the external determination device 26, whereby the vacuum valve 1. It is possible to grasp the soundness of internal pressure (presence / absence of abnormality).

  According to such a vacuum circuit breaker 30D of the present embodiment, not only can the same effect as that of the first embodiment be obtained, but also the internal pressure of the vacuum valve 1 can be monitored. The improvement of the property, that is, the reliability of the vacuum circuit breaker 30D can be improved.

  FIG. 6 shows a fifth embodiment of the vacuum circuit breaker according to the present invention. Note that a description of the same parts as those in the fourth embodiment will be omitted.

  In the vacuum circuit breaker 30E of this embodiment shown in the figure, the fixing members 19 are arranged at two locations, and the fixing members 19 straddle the mold part 1A and the operation mechanism part 4 around the vacuum valve 1. The fixing member 19 is fixed to the casing of the mold part 1A around the vacuum valve 1 and the operation mechanism part 4 as in the fourth embodiment, but a plurality of fixing members 19 (two in this embodiment) are arranged in the circumferential direction. The inspection insert nuts 23a, 23b that are paired with the inspection bolts 22a, 22b are fixed at positions spaced apart from the floating potential metal 11 by a predetermined distance, and the inspection bolts 22a, 22b and the inspection insert nuts 23a, 23 b is electrically insulated from the fixing member 19 by an insulating member 24.

  In the present embodiment, the inspection insert nuts 23a and 23b having different overall lengths are embedded in the overhang portion 20a of the mold.

  The vacuum circuit breaker 30E of the present embodiment configured as described above can obtain the same effect as that of the first embodiment, and of course, the distance between the floating potential metal 11 of the vacuum valve 1 and the insert nuts 23a and 23b for inspection. Since the distances L1 and L2 in FIG. 6 are different, the potentials generated in the inspection bolts 22a and 22b can be changed.

  6, the upper inspection insert nut 23a has a shorter distance from the floating potential metal 11 of the vacuum valve 1 than the lower inspection insert nut 23b. Rises, the potential of the upper inspection insert nut 23a first rises. Further, when the internal pressure of the vacuum valve 1 increases, the potential of the lower inspection insert nut 23b increases. If the relationship between the pressure and the potential increase of the insert nuts 23a and 23b for inspection is grasped in advance, it becomes a simple pressure gauge, and it is possible to grasp how much the internal pressure of the vacuum valve 1 has deteriorated.

  In the present embodiment, two inspection bolts 22a and 22b are shown. However, if there are a plurality of inspection bolts 22a and 22b in the circumferential direction, the accuracy of pressure measurement can be improved by that amount.

  FIG. 7 shows a sixth embodiment of the vacuum circuit breaker according to the present invention. Note that the description of the same parts as those in the first and fourth embodiments is omitted.

  In the vacuum circuit breaker 30F of this embodiment shown in the figure, a set of one inspection insert nut 23a1 (or 23a2, 23a3) paired with one inspection bolt 22a1 (or 22a2, 22a3) is a vacuum valve 1. A plurality (three in this embodiment) of the floating potential metal 11 are arranged in the axial direction of the floating potential metal 11, and each of the three arranged for the inspection in the axial direction of the floating potential metal 11 The insert nuts 23a1, 23a2, and 23a3 are arranged so that the distance from the floating potential metal 11 is different.

  Specifically, the fixing member 19 is configured to straddle the mold part 1A and the operation mechanism part 4 around the vacuum valve 1, and the fixing member 19 includes the mold part 1A and the operation mechanism part 4 around the vacuum valve 1. At this time, the fixing member 19 positioned around the floating potential metal 11 is connected to the mold portion 1A of the vacuum valve 1 with the inspection bolts 22a1, 22a2, 22a3 and the inspection member. The inspection insert nuts 23a1, 23a2, 23a3 paired with the bolts 22a1, 22a2, 22a3 are fixed at three locations so that the distance between the inspection insert nuts 23a1, 23a2, 23a3 and the floating potential metal 11 is different. Yes.

  Each of the inspection bolts 22a1, 22a2, 22a3 and the inspection insert nuts 23a1, 23a2, 23a3 are electrically insulated from the fixing member 19 by an insulating member 24.

  In this embodiment, the inspection insert nuts 23a1, 23a2, and 23a3 having different overall lengths are embedded in the overhang portions 20a1, 20a2, and 20a3 of the mold portion 1A around the vacuum valve 1, respectively.

  The vacuum circuit breaker 30F of the present embodiment configured as described above can obtain the same effect as that of the first embodiment, and of course, the floating potential metal 11 of the vacuum valve 1 and each of the inspection insert nuts 23a1, 23a2, Since the distance between 23a3 is different, the potential generated in the inspection bolts 22a1, 22a2, 22a3 can be changed.

  For example, in FIG. 7, the left inspection insert nut 23a1 has the shortest distance from the floating potential metal 11 of the vacuum valve 1, and then the center inspection insert nut 23a2 and the right inspection insert nut 23a3 become longer. When the internal pressure of the vacuum valve 1 rises, the potential of the left inspection insert nut 23a1 first rises. When the internal pressure of the vacuum valve 1 rises further, the central inspection insert nut 23a2 and the right inspection nut 23a1 The potential of the insert nut 23a3 increases. If the relationship between the pressure and the potential increase of the insert nuts 23a1, 23a2, and 23a3 for inspection is known in advance, it becomes a simple pressure gauge, and it is possible to grasp how much the internal pressure of the vacuum valve 1 has deteriorated. it can.

  In the present embodiment, three inspection bolts 22a1, 22a2, and 22a3 are shown. However, if further added in the axial direction, the accuracy of pressure measurement can be improved.

  The above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Vacuum valve, 1A ... Mold part of vacuum valve, 2 ... Fixed side cable bushing, 3 ... Movable side cable bushing, 4 ... Operation mechanism part, 5 ... Cylindrical insulating material, 6 ... Fixed side end plate, 7 ... Fixed side Conductor, 8 ... movable side end plate, 9 ... bellows, 10 ... movable side conductor, 11 ... floating potential metal, 12 ... fixed side electrode, 13 ... movable side electrode, 14 ... insulating rod for operation, 15 ... fixed side cable bushing Conductor, 16 ... movable cable bushing conductor, 17 ... contact, 18 ... insulating gas, 19, 19a, 19b ... fixing member, 19 '... bent fixing member, 20a, 20b, 20c, 20a1, 20a2, 20a3 ... mold Overhang, 21a, 21b, 21c, 21d, 21e ... bolts, 22, 22a, 22b, 22a1, 22a2, 22a3 ... inspection bolts, 23, 23a, 2 b, 23a1, 23a2, 23a3 ... Insert nut for inspection, 24 ... insulating member, 25 ... pressure monitoring device, 25a ... connection line, 25b1, 25b2 ... insulator, 25c ... potential measuring device, 25d ... potential fixing point, 26 ... Determination device, 30A, 30B, 30C, 30D, 30E, 30F ... Vacuum circuit breaker.

Claims (11)

A vacuum circuit breaker comprising: a vacuum valve in which at least a fixed side electrode and a movable side electrode are housed, and the periphery thereof is covered with a mold part;
A vacuum circuit breaker characterized in that the vacuum valve and the operation mechanism part are arranged on a straight line, and a fixing member is provided to fix the vacuum valve and the operation mechanism part across the mold part and the operation mechanism part. The vacuum circuit breaker according to claim 1,
The vacuum circuit breaker, wherein the fixing member is fixed to a plurality of mold projecting portions provided on the side surfaces of the mold portion of the vacuum valve and the operation mechanism portion by fastening means. The vacuum circuit breaker according to claim 2,
The vacuum valve includes a fixed-side end plate joined to one end of a cylindrical insulating material, a fixed-side conductor that hermetically passes through the fixed-side end plate, and a movable-side end plate joined to the other end of the cylindrical insulating material. And a bellows having one end joined to the movable side end plate and permitting the drive of the movable part, and a movable side conductor that penetrates the bellows in an airtight manner and drives in the axial direction while maintaining a vacuum,
Inside the vacuum valve, the floating potential metal supported by the cylindrical insulating material, the fixed side electrode connected to the end of the fixed side conductor, and the end connected to the end of the movable side conductor A vacuum circuit breaker characterized in that a movable electrode is disposed. The vacuum circuit breaker according to claim 3,
A fixed-side cable bushing electrically connected to the fixed-side conductor and a movable-side cable bushing electrically connected to the movable-side conductor;
The vacuum breaker, wherein the fixing member is also disposed on a side surface of the fixed-side cable bushing located on the opposite side to the operation mechanism portion. The vacuum circuit breaker according to claim 4,
The fixing member extends in the axial direction and bends inward at a position beyond the fixed-side cable bushing. A vacuum circuit breaker fixed by means. The vacuum circuit breaker according to claim 3,
The fastening means for fixing the fixing member at the mold projecting portion located around the floating potential metal is an inspection bolt, and the inspection bolt and an inspection insert nut paired with the inspection bolt are provided. The fixing member is fixed at a position separated from the floating potential metal by a predetermined distance, and the inspection bolt and the inspection insert nut are electrically insulated from the fixing member via an insulating member. A featured vacuum circuit breaker. The vacuum circuit breaker according to claim 6,
A pressure monitoring device that detects an increase in potential of the floating potential metal when the pressure of the vacuum valve increases is connected to the inspection bolt, and an internal pressure of the vacuum valve is detected from a detection signal detected by the pressure monitoring device. A vacuum circuit breaker comprising a determination device for determining presence or absence of abnormality. The vacuum circuit breaker according to claim 7,
The pressure monitoring device is partially connected to at least one of the inspection bolt and the inspection insert nut via the connection line connected to at least one of the inspection bolt and the inspection insert nut. A plurality of insulators connected in series to each other, and a potential measuring instrument connected between the plurality of insulators, and among the plurality of insulators partially connected in series, the inspection bolt A vacuum circuit breaker characterized in that an insulator different from the one insulator located on the side closer to the inspection insert nut is connected to the potential fixing point. The vacuum circuit breaker according to claim 6,
A plurality of the inspection bolts and the inspection insert nuts are arranged in a circumferential direction or an axial direction of the floating potential metal. The vacuum circuit breaker according to claim 9,
The vacuum circuit breaker characterized in that each of the plurality of inspection insert nuts arranged in the circumferential direction or the axial direction of the floating potential metal is arranged so as to have a different distance from the floating potential metal. . The vacuum circuit breaker according to claim 1,
A plurality of the fixing members are arranged, each of the fixing members straddling the mold part of the vacuum valve and the operation mechanism part, and a plurality of mold projecting parts provided protruding from the side surfaces of the mold part of the vacuum valve, A vacuum circuit breaker characterized in that the vacuum circuit breaker is fixed to the operation mechanism portion by fastening means.

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