EP3370243B1 - Vacuum circuit breaker - Google Patents
Vacuum circuit breaker Download PDFInfo
- Publication number
- EP3370243B1 EP3370243B1 EP18156010.3A EP18156010A EP3370243B1 EP 3370243 B1 EP3370243 B1 EP 3370243B1 EP 18156010 A EP18156010 A EP 18156010A EP 3370243 B1 EP3370243 B1 EP 3370243B1
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- EP
- European Patent Office
- Prior art keywords
- inspection
- vacuum valve
- circuit breaker
- vacuum
- vacuum circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000007689 inspection Methods 0.000 claims description 79
- 239000002184 metal Substances 0.000 claims description 31
- 239000004020 conductor Substances 0.000 claims description 22
- 238000012806 monitoring device Methods 0.000 claims description 9
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 11
- 239000011810 insulating material Substances 0.000 description 6
- 230000006866 deterioration Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 229910018503 SF6 Inorganic materials 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/662—Housings or protective screens
- H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/027—Integrated apparatus for measuring current or voltage
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/668—Means for obtaining or monitoring the vacuum
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/662—Housings or protective screens
- H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
- H01H2033/6623—Details relating to the encasing or the outside layers of the vacuum switch housings
Definitions
- the present invention relates to a vacuum circuit breaker and, in particular, to a vacuum circuit breaker suitably applied to a mold vacuum valve in which a vacuum valve is molded with a solid insulating material.
- Patent Document 1 One of a conventional technique related to a vacuum circuit breaker is a technique described in Japanese Patent Laid-Open No. 2003-333715 (Patent Document 1).
- a switch gear which is provided with a plurality of components including a switch gear component, an insulating part to insulate the switch gear component, and a bonding part to bond the switch gear component in a vertical direction and which bonds the plurality of components in a vertical direction is described as a switch gear of an encapsulated type which stores an opening/ closing part including a valve of a vacuum circuit breaker or a vacuum disconnector in a switch gear and which constructs a power supply system.
- the switch gear described in the Patent Document 1 is mounted with a vacuum circuit breaker to which a mold vacuum valve having a vacuum valve covered with an insulating material is applied, and the mold vacuum valve is constructed in such a way as to be in contact with only a ceiling plate of an operating chamber.
- the mold vacuum valve is fixed at a portion in contact with the ceiling plate of an operating mechanism part.
- a fixing part such as a nut or a bolt is embedded in a mold part in contact with the ceiling plate of the operating mechanism part, and the vacuum circuit breaker is fixed_to the ceiling plate of the operating mechanism part by the fixing part.
- the bolt or the nut is loosened by a driving of the operating mechanism part, in other words, by an impact and a vibration caused by an operation of opening or closing the vacuum circuit breaker, whereby the operation of opening or closing the vacuum circuit breaker is made unstable. Further, it is also concerned that a case of the operating mechanism part is bent by the impact and the vibration caused by the operation of opening or closing the vacuum circuit breaker, whereby a speed of opening or closing the vacuum circuit breaker is reduced.
- the present invention has been made in view of the above-mentioned problem, and an object of the present invention is to provide a vacuum circuit breaker that can reduce a stress due to an impact and a vibration caused by an operation of opening or closing the vacuum circuit breaker without increasing a weight and a size of the vacuum circuit breaker to thereby reduce a bend of a case of the operating mechanism part and to thereby improve a reliability to the operation of the opening or closing the vacuum circuit breaker.
- US 3 471 669 A discloses a vacuum circuit breaker with the features in the preamble of present claim 1.
- a vacuum circuit breaker of the present invention has the features defined in claim 1.
- the present invention without increasing a weight and a size of the vacuum circuit breaker, it is possible to reduce a stress due to an impact and a vibration caused by an operation of opening or closing the vacuum circuit breaker and to reduce a bend of a case of the operating mechanism part and to improve a reliability to the operation of the opening/ closing the vacuum circuit breaker. According to the present invention it is possible to measure the level of vacuum by means of an inspection bolt.
- FIG. 1 is a partial cross-sectional view of a vacuum circuit breaker of a first example useful to understand the present invention.
- a vacuum circuit breaker 30A of the present example is roughly constructed of: a vacuum valve 1 which is integrally molded with a solid insulating material such as an epoxy resin (whose periphery is covered with a mold part 1A); a fixed side cable bushing 2 in which a periphery of a fixed side cable bushing conductor 15 is molded; a movable side cable bushing 3 in which a periphery of an outside portion of a movable side cable bushing conductor 16 is molded; and an operating mechanism part 4 which operates a movable side electrode 13 which will be described later.
- the vacuum valve 1 molded with the solid insulating material such as the epoxy resin
- a mold vacuum valve is usually grounded.
- the vacuum valve 1 described above is constructed of: a fixed side end plate 6 bonded to one end of a cylindrical insulating member 5; a fixed side conductor 7 which airtightly passes through the fixed side end plate 6; a movable side end plate 8 which is bonded to the other end of the cylindrical insulating member 5; a bellows 9 which is shaped like a serpentine belly and whose one end is bonded to the movable side end plate 8 and which allows a movable part to move; and a movable side conductor 10 which airtightly passes through the bellows 9 and which moves in an axial direction while keeping a vacuum.
- An internal pressure in the vacuum valve 1 is held in a vacuum equal to or less than approximately 10 -2 Pa.
- a floating potential metal 11 supported by the cylindrical insulating material 5 a fixed side electrode 12 connected to an end portion of the fixed side conductor 7, and the movable side electrode 13 connected to an end portion of the movable side conductor 10 are arranged.
- the movable side conductor 10 is connected to an operating insulating rod 14, and the operating insulating rod 14 is connected to an operating part which is stored in the operating mechanism part 4 and which is coupled to a wipe mechanism to apply a contact load to a pair of electrodes.
- a space surrounding the operating insulating rod 14 is filled with an insulating gas 18 such as air and sulfur hexafluoride.
- the movable side electrode 13 moves via the operating insulating rod 14 in conjunction with a movement of the operating part (not shown), the fixed side electrode 12 and the movable side electrode 13 can be brought into contact with or separated from each other, that is, an opened state and a closed state of the vacuum valve 1 can be switched.
- the vacuum valve 1 shown in FIG. 1 shows the opened state.
- the fixed side cable bushing 2 electrically connects the fixed side cable bushing conductor 15 to the fixed side conductor 7 of the vacuum valve 1, and the movable side cable bushing 3 has the movable side cable bushing conductor 16 arranged on a movable side of the vacuum valve 1 and is integrally molded with the solid insulating material such as the epoxy resin, and the movable side conductor 10 and the movable side cable bushing conductor 16 of the vacuum valve 1 are electrically connected to each other via a contactor 17 capable of sliding and passing electricity, and the fixed side cable bushing 2 and the movable side cable bushing 3 have a power supply side cable and a load side cable, both of which are not shown, connected thereto respectively.
- the vacuum valve 1 is constructed in such a way as to be operated.
- the vacuum circuit breaker 30A of the present example is constructed as follows: the vacuum valve 1 and the operating mechanism part 4 are arranged nearly on a straight line; and a fixing member 19 is provided which extends over and integrally fixes the mold part 1A on a periphery of the vacuum valve 1 and the operating mechanism part 4.
- a portion on a vacuum valve 1 side of the fixing member 19 is fixed to a plurality of mold protruding portions (integrally molded with the mold part 1A) 20a, 20b, each of which is formed on an outside portion of a side surface of the mold part 1A of the vacuum valve 1 in such a way as to protrude and has an insert nut embedded therein, with bolts 21a, 21b of fixing means, whereas a portion on an operating mechanism part 4 side of the fixing member 19 is directly fixed to a case of the operating mechanism part 4 with bolts 21c, 21d, of fixing means (the operating mechanism part 4 does not have but may have a protruding part).
- the vacuum circuit breaker 30A of the present example constructed in this way can receive a driving force of the operating mechanism part 4, that is, a stress due to an impact and a vibration caused by an operation of opening or closing the vacuum circuit breaker 30A also by the fixing member 19 and hence the stress can be dispersed.
- the mold part 1A of the vacuum valve 1 and the case of the operating mechanism part 4 are fixed at a plurality of portions with the bolts 21a, 21b, 21c, 21d via the fixing member 19, so the stress due to the impact and the vibration caused by the operation of opening or closing the vacuum circuit breaker 30A can be dispersed at respective fixed portions.
- FIG. 2 is a partial cross-sectional view of a vacuum circuit breaker of a second example useful to understand the present invention. Descriptions of the same parts as the first example will be omitted.
- a vacuum circuit breaker 30B of the present example shown in FIG. 2 is constructed in such a way that the fixing member 19 extends over the mold part 1A on a periphery of the vacuum valve 1 and the operating mechanism part 4 at a plurality of positions.
- the fixing member 19 is plurally arranged and the respective fixing members 19a, 19b extend over the mold part 1A of the vacuum valve 1 and the operating mechanism part 4 and are fixed to a plurality of mold protruding portions 20a, 20b, each of which is formed on a side surface of the mold part 1A of the vacuum valve 1 in such a way as to protrude, and to the case of the operating mechanism part 4 with bolts 21a, 21b, 21c, 21d of fixing means.
- the other construction is the same as the first example.
- the vacuum circuit breaker 30B of the present example constructed in this manner receives the driving force of the operating mechanism part 4, that is, a stress due to an impact and a vibration caused by an operation of opening or closing the vacuum circuit breaker 30B by two fixing members 19a, 19b, so the stress received by one fixing member 19 can be reduced more than the first example.
- a trouble such that the bolts 21a, 21b, 21c, 21d and the nuts to fix the molded vacuum valve 1 and the case of the operating mechanismpart 4 are loosened or a trouble such that the operating mechanism part 4 is bent can be inhibited more than the first example. Therefore, a reliability to the operation of opening or closing the molded vacuum valve 1 or the vacuum circuit breaker 30B mounted with the molded vacuum valve 1 can be further improved.
- FIG. 3 is a partial cross-sectional view of a vacuum circuit breaker of a third example useful to understand the present invention . Descriptions of the same parts as the first example will be omitted.
- the fixing member 19 is arranged also on a side surface of the fixed side cable bushing 2 located on a side opposite to the operating mechanism part 4.
- the fixing member 19 is extended in an axial direction and is bent inside by approximately 90 degrees at a position over the fixed side cable bushing 2, and this bent fixing member 19' is fixed to a mold protruding portion 20c, which is formed in a mold part to cover a periphery of the fixed cable bushing 2 and in which an insert nut is embedded, by a bolt 21e of a fastening means.
- the other construction is the same as the first example.
- the fixing member 19 is extended in the axial direction and intersects the fixed side cable bushing 2, which can be realized by forming a through hole through which the fixing member 19 can be passed in the fixed side cable bushing 2. Further, the fixing member 19 can also be arranged in such a way that the fixing member 19 does not intersect the fixed side cable bushing 2 and avoids the fixed side cable bushing 2.
- the vacuum circuit breaker 30C of the present example constructed in this manner has the bent fixing member 19' and hence can disperse the driving force of the operating mechanism part 4, that is, the stress due to an impact and a vibration caused by the operation of opening or closing the vacuum circuit breaker 30C more than the first example.
- a trouble such that the bolts 21a, 21b, 21c, 21d and the nuts to fix the molded vacuum valve 1 and the case of the operating mechanism part 4 are loosened or a trouble such that the operating mechanism part 4 is bent can be inhibited more than the first example. Therefore, a reliability to the operation of opening or closing the molded vacuum valve 1 or the vacuum circuit breaker 30C mounted with the molded vacuum valve 1 can be further improved.
- FIG. 4 is a partial cross-sectional view of a vacuum circuit breaker of a first embodiment of the present invention. Descriptions of the same parts as the first example will be omitted.
- a portion on a vacuum valve 1 side of the fixing member 19 is fixed to the mold protruding portion by a bolt and a portion on an operating mechanism part 4 side of the fixing member 19 is directly fixed to the case of the operating mechanism part 4 by bolts 21c, 21d of fastening means.
- the fixing bolt 21a to fix the fixing member 19 by the mold protruding portion located on a periphery of the floating potential metal 11 is an inspection bolt 22 to inspect a pressure (degree of vacuum) in the vacuum valve 1.
- 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 has a pressure monitoring device 25, which detects a potential increase in the floating potential metal 11 when the pressure in the vacuum valve 1 increases, connected thereto, and has a determination device 26 which determines whether or not the internal pressure in the vacuum valve 1 is abnormal from an inspection signal detected by the pressure monitoring device 25.
- the pressure monitoring device 25 is constructed of: a connection line 25a which is connected to at least one of the inspection bolt 22 and the inspection insert nut 23; a plurality of insulating components (for example, capacitors) 25b1, 25b2 which are connected partially in series to at least one of the inspection bolt 22 and the inspection insert nut 23 via the connection line 25a; and a potential measuring device 25c which is connected between the plurality of insulating components 25b1, 25b2.
- the insulating component 25b2 which is different from the insulating component 25b1 located close to the inspection bolt 22 and the inspection insert nut 23 is connected to a potential fixed point (earth) 25b.
- the vacuum circuit breaker 30D of the present embodiment constructed in this manner has the pressure monitoring device 25 connected to the inspection b olt 22, so in a case where a pressure deterioration is caused in the vacuum valve 1 and hence a potential is generated on the inspection bolt 22, the vacuum circuit breaker 30D can monitor whether or not the internal pressure in the vacuum valve 1 is abnormal.
- a pressure increase in a vacuum vessel is mainly caused by a gas permeation from the outside of the vacuum vessel, a gas emission from an internal member of the vacuum vessel, and a pinhole rarely caused in the bellows 9 and a bonded portion, and as shown by a Paschen's curve which expresses a relationship between a pressure in a vacuum vessel and a discharge start voltage and is shown in FIG. 5 , when the pressure in the vacuum vessel becomes 10 -1 Pa or more, an insulation performance starts to quickly decrease.
- a potential of the floating potential metal 11 at the time of a normal operation when the pressure increase is not caused in the vacuum valve 1 is roughly determined by an operating voltage, a structure of the vacuum valve 1, and an arrangement of a fixed potential member on a periphery of the vacuum valve 1 (for example, a case or a floor of a vehicle), whereas a potential of the floating potential metal 11 when the pressure increase is caused and a discharge occurs between the main circuit of the vacuum valve 1 and the floating potential metal 11 becomes a potential in which a discharge pulse is superimposed on the potential at the time of the normal operation. Further, when the pressure is more increased, an increased discharge pulse is superimposed on the potential and, finally, the potential of the floating potential metal 11 is increased to a state close to the operating voltage.
- a potential increase in the floating potential metal 11 when the pressure is increased in the vacuum valve 1 is detected by the pressure monitoring device 25 connected to the inspection bolt 22 and its detection signal is outputted to the external determination device 26, whereby the soundness of the internal pressure in the vacuum valve 1 (whether or not the internal pressure in the vacuum valve 1 is abnormal) can be gotten.
- this vacuum circuit breaker 30D of the present embodiment not only the same effect as the first example can be produced but also the internal pressure in the vacuum valve 1 can be monitored. Hence, an insulation reliability of the vacuum valve 1 can be improved, in other words, the reliability of the vacuum circuit breaker 30D can be improved.
- FIG. 6 shows a vacuum circuit breaker of a second embodiment of the present invention and is a drawing corresponding to a cross section along a line A - A' in FIG. 2 . Descriptions of the same parts as the first embodiment will be omitted.
- a vacuum circuit breaker 30E of the present embodiment shown in FIG. 6 is constructed in such a way that the fixing members 19 are arranged at two portions and that these fixing members 19 extend over the mold part 1A on the periphery of the vacuum valve 1 and over the operating mechanism part 4.
- the fixing members 19, as is the case with the first embodiment, are fixed to the mold part 1A on the periphery of the vacuum valve 1 and to the case of the operating mechanism part 4, but the inspection insert nuts 23a, 23b which pair with the inspection bolts 22a, 22b, which are arranged plurally (in the present embodiment, by two) in a peripheral direction, are fixed at positions separated from the floating potential metal 11 by a predetermined distance.
- the inspection bolts 22a, 22b and the inspection insert nuts 23a, 23b are electrically insulated from the fixing members 19 by the insulating member 24.
- the inspection insert nuts 23a, 23b which are different from each other in a total length are embedded respectively in the mold protruding portion 20a.
- the vacuum circuit breaker 30E of the present embodiment constructed in this manner can produce the same effect as the first example, which is needless to say, and distances between the floating potential metal 11 of the vacuum valve 1 and the inspection insert nuts 23a, 23b are different from each other, in other words, distances L1 and L2 shown in FIG. 6 are different from each other, so potentials generated at the inspection bolts 22a, 22b can be made different from each other.
- the vacuum circuit breaker 30E is constructed in such a way that a distance between the inspection insert nut 23a on an upper side and the floating potential metal 11 of the vacuum valve 1 is shorter than a distance between the inspection insert nut 23b on a lower side and the floating potential metal 11 of the vacuum valve 1.
- a potential of the inspection insert nut 23a on the upper side increases.
- a potential of the inspection insert nut 23b on the lower side increases.
- Two inspection bolts 22a, 22b are shown in the present embodiment, but when a plurality of inspection bolts are arranged in a peripheral direction, an accuracy of measuring the internal pressure in the vacuum valve 1 can be improved according to the number of the inspection bolts.
- FIG. 7 is a partial cross-sectional view of a vacuum circuit breaker of a third embodiment of the present invention. Descriptions of the same parts as the first example and the first embodiment will be omitted.
- a set of one inspection bolt 22a1 (or 22a2, 22a3) and one inspection insert nut 23a1 (or 23a2, 23a3) which pairs with the one inspection bolt 22a1 (or 22a2, 22a3) are arranged plurally (in the present embodiment, by three) on the mold part 1A of the periphery of the vacuum valve 1 and in an axial direction of the floating potential metal 11, and the three inspection insert nuts 23a1, 23a2, 23a3 arranged in the axial direction of the floating potential metal 11 are arranged in such a way that distances between the three inspection insert nuts 23a1, 23a2, 23a3 and the floating potential metal 11 are different from each other.
- the fixing member 19 is constructed in a such a way as to extend over the mold part 1A on the periphery of the vacuum valve 1 and over the operating mechanism part 4 and the fixing member 19 is fixed to the mold part 1A on the periphery of the vacuum valve 1 and to the case of the operating mechanism part 4.
- the fixing member 19 arranged on the periphery of the floating potential metal 11 is fixed to the mold part 1A on the periphery of the vacuum valve 1 at three portions by the inspection bolts 22a1, 22a2, 22a3 and the inspection insert nuts 23a1, 23a2, 23a3, which pair with the inspection bolts 22a1, 22a2, 22a3, in such a way that the inspection insert nuts 23a1, 23a2, 23a3 are different from each other in a distance from the floating potential metal 11.
- the respective inspection bolts 22a1, 22a2, 22a3 and the respective inspection insert nuts 23a1, 23a2, 23a3 are electrically insulated from the fixing member 19 by the insulating member 24.
- the inspection insert nuts 23a1, 23a2, 23a3, which are different from each other in a total length, are respectively embedded in protruding parts 20a1, 20a2, 20a3 of the mold part 1A on the periphery of the vacuum valve 1.
- the vacuum circuit breaker 30F of the present embodiment constructed in this manner can produce the same effect as the first example, which is needless to say, and since the distances between the floating potential metal 11 of the vacuum valve 1 and the respective inspection insert nuts 23a1, 23a2, 23a3 are different from each other, the potentials generated at the inspection bolts 22a1, 22a2, 22a3 can be made different from each other.
- a distance between the inspection insert nut 23a1 on the left side and the floating potential metal 11 of the vacuum valve 1 is the shortest, and a distance between the inspection insert nut 23a2 and the floating potential metal 11 of the vacuum valve 1 is shorter, and then a distance between the inspection insert nut 23a3 on the right side and the floating potential metal 11 of the vacuum valve 1 is long.
- the internal pressure in the vacuum valve 1 increases, first, the potential of the inspection insert nut 23a1 on the left side increases, and when the internal pressure in the vacuum valve 1 increases more, the potential of the inspection insert nut 23a2 increases, and when the internal pressure in the vacuum valve 1 increases still more, the potential of the inspection insert nut 23a3 increases.
- Three inspection bolts 22a1, 22a2, 22a3 are shown in the present embodiment, but when the inspection bolts are arranged additionally in the axial direction, an accuracy of measuring the internal pressure in the vacuum valve 1 can be improved according to the number of the inspection bolts.
Landscapes
- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
- Gas-Insulated Switchgears (AREA)
Description
- The present invention relates to a vacuum circuit breaker and, in particular, to a vacuum circuit breaker suitably applied to a mold vacuum valve in which a vacuum valve is molded with a solid insulating material.
- One of a conventional technique related to a vacuum circuit breaker is a technique described in Japanese Patent Laid-Open No.
2003-333715 Patent Document 1, a switch gear which is provided with a plurality of components including a switch gear component, an insulating part to insulate the switch gear component, and a bonding part to bond the switch gear component in a vertical direction and which bonds the plurality of components in a vertical direction is described as a switch gear of an encapsulated type which stores an opening/ closing part including a valve of a vacuum circuit breaker or a vacuum disconnector in a switch gear and which constructs a power supply system. - The switch gear described in the
Patent Document 1 is mounted with a vacuum circuit breaker to which a mold vacuum valve having a vacuum valve covered with an insulating material is applied, and the mold vacuum valve is constructed in such a way as to be in contact with only a ceiling plate of an operating chamber. Namely, the mold vacuum valve is fixed at a portion in contact with the ceiling plate of an operating mechanism part. Specifically, a fixing part such as a nut or a bolt is embedded in a mold part in contact with the ceiling plate of the operating mechanism part, and the vacuum circuit breaker is fixed_to the ceiling plate of the operating mechanism part by the fixing part. - However, according to a construction described in the
Patent Document 1, it is concerned that the bolt or the nut is loosened by a driving of the operating mechanism part, in other words, by an impact and a vibration caused by an operation of opening or closing the vacuum circuit breaker, whereby the operation of opening or closing the vacuum circuit breaker is made unstable. Further, it is also concerned that a case of the operating mechanism part is bent by the impact and the vibration caused by the operation of opening or closing the vacuum circuit breaker, whereby a speed of opening or closing the vacuum circuit breaker is reduced. - As a countermeasure against this, it is thought that a size of the fixing part such as the bolt or the nut is increased to thereby increase a fastening force of the fixing part or that a plate thickness of the case of the operating mechanism part is increased to thereby inhibit the case of the operating mechanism from being bent. However, this countermeasure inevitably presents a problem such that the vacuum circuit breaker is increased in weight and size.
- The present invention has been made in view of the above-mentioned problem, and an object of the present invention is to provide a vacuum circuit breaker that can reduce a stress due to an impact and a vibration caused by an operation of opening or closing the vacuum circuit breaker without increasing a weight and a size of the vacuum circuit breaker to thereby reduce a bend of a case of the operating mechanism part and to thereby improve a reliability to the operation of the opening or closing the vacuum circuit breaker.
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US 3 471 669 A discloses a vacuum circuit breaker with the features in the preamble ofpresent claim 1. - In order to achieve the object described above, a vacuum circuit breaker of the present invention has the features defined in
claim 1. - According to the present invention, without increasing a weight and a size of the vacuum circuit breaker, it is possible to reduce a stress due to an impact and a vibration caused by an operation of opening or closing the vacuum circuit breaker and to reduce a bend of a case of the operating mechanism part and to improve a reliability to the operation of the opening/ closing the vacuum circuit breaker. According to the present invention it is possible to measure the level of vacuum by means of an inspection bolt.
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FIG. 1 is a partial cross-sectional view of a vacuum circuit breaker of a first example useful to understand the present invention. -
FIG. 2 is a partial cross-sectional view of a vacuum circuit breaker of a second example useful to understand of the present invention. -
FIG. 3 is a partial cross-sectional view of a vacuum circuit breaker of a third example useful to understand the present invention. -
FIG. 4 is a partial cross-sectional view of a vacuum circuit breaker of a first embodiment of the present invention. -
FIG. 5 is a graph to show a Paschen's curve to illustrate a relationship between a pressure in a vacuum vessel and a discharge start voltage in the vacuum circuit breaker shown inFIG. 4 . -
FIG. 6 shows a vacuum circuit breaker of a second embodiment of the present invention and is a view corresponding to a cross section along a line A - A' ofFIG. 2 . -
FIG. 7 is a partial cross-sectional view of a vacuum circuit breaker of a third embodiment of the present invention. - Hereinafter, a vacuum circuit breaker of the present invention will be described on the basis of illustrated embodiments and examples useful to understand the invention. Same reference signs will be used for same constituent parts in the respective embodiments or examples.
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FIG. 1 is a partial cross-sectional view of a vacuum circuit breaker of a first example useful to understand the present invention. - As shown in
FIG. 1 , avacuum circuit breaker 30A of the present example is roughly constructed of: avacuum valve 1 which is integrally molded with a solid insulating material such as an epoxy resin (whose periphery is covered with amold part 1A); a fixedside cable bushing 2 in which a periphery of a fixed sidecable bushing conductor 15 is molded; a movableside cable bushing 3 in which a periphery of an outside portion of a movable sidecable bushing conductor 16 is molded; and anoperating mechanism part 4 which operates amovable side electrode 13 which will be described later. Usually, thevacuum valve 1 molded with the solid insulating material such as the epoxy resin is referred to as a mold vacuum valve. Although not especially shown, a mold part is usually grounded. - The
vacuum valve 1 described above is constructed of: a fixedside end plate 6 bonded to one end of a cylindrical insulatingmember 5; a fixedside conductor 7 which airtightly passes through the fixedside end plate 6; a movableside end plate 8 which is bonded to the other end of the cylindrical insulatingmember 5; abellows 9 which is shaped like a serpentine belly and whose one end is bonded to the movableside end plate 8 and which allows a movable part to move; and amovable side conductor 10 which airtightly passes through thebellows 9 and which moves in an axial direction while keeping a vacuum. An internal pressure in thevacuum valve 1 is held in a vacuum equal to or less than approximately 10-2 Pa. - In the
vacuum valve 1, a floatingpotential metal 11 supported by the cylindrical insulatingmaterial 5, a fixedside electrode 12 connected to an end portion of the fixedside conductor 7, and themovable side electrode 13 connected to an end portion of themovable side conductor 10 are arranged. - The
movable side conductor 10 is connected to an operating insulatingrod 14, and the operating insulatingrod 14 is connected to an operating part which is stored in theoperating mechanism part 4 and which is coupled to a wipe mechanism to apply a contact load to a pair of electrodes. A space surrounding the operating insulatingrod 14 is filled with an insulatinggas 18 such as air and sulfur hexafluoride. - Further, when the
movable side electrode 13 moves via the operating insulatingrod 14 in conjunction with a movement of the operating part (not shown), the fixedside electrode 12 and themovable side electrode 13 can be brought into contact with or separated from each other, that is, an opened state and a closed state of thevacuum valve 1 can be switched. Thevacuum valve 1 shown inFIG. 1 shows the opened state. - The fixed
side cable bushing 2 electrically connects the fixed sidecable bushing conductor 15 to the fixedside conductor 7 of thevacuum valve 1, and the movableside cable bushing 3 has the movable sidecable bushing conductor 16 arranged on a movable side of thevacuum valve 1 and is integrally molded with the solid insulating material such as the epoxy resin, and themovable side conductor 10 and the movable sidecable bushing conductor 16 of thevacuum valve 1 are electrically connected to each other via acontactor 17 capable of sliding and passing electricity, and the fixedside cable bushing 2 and the movableside cable bushing 3 have a power supply side cable and a load side cable, both of which are not shown, connected thereto respectively. In this way, thevacuum valve 1 is constructed in such a way as to be operated. - Then, the
vacuum circuit breaker 30A of the present example is constructed as follows: thevacuum valve 1 and theoperating mechanism part 4 are arranged nearly on a straight line; and a fixingmember 19 is provided which extends over and integrally fixes themold part 1A on a periphery of thevacuum valve 1 and theoperating mechanism part 4. - Specifically, a portion on a
vacuum valve 1 side of the fixingmember 19 is fixed to a plurality of mold protruding portions (integrally molded with themold part 1A) 20a, 20b, each of which is formed on an outside portion of a side surface of themold part 1A of thevacuum valve 1 in such a way as to protrude and has an insert nut embedded therein, withbolts operating mechanism part 4 side of the fixingmember 19 is directly fixed to a case of theoperating mechanism part 4 withbolts operating mechanism part 4 does not have but may have a protruding part). - The
vacuum circuit breaker 30A of the present example constructed in this way can receive a driving force of theoperating mechanism part 4, that is, a stress due to an impact and a vibration caused by an operation of opening or closing thevacuum circuit breaker 30A also by the fixingmember 19 and hence the stress can be dispersed. Namely, themold part 1A of thevacuum valve 1 and the case of theoperating mechanism part 4 are fixed at a plurality of portions with thebolts member 19, so the stress due to the impact and the vibration caused by the operation of opening or closing thevacuum circuit breaker 30A can be dispersed at respective fixed portions. - As a result, a trouble such that the
bolts vacuum valve 1 and theoperating mechanism part 4 are loosened can be reduced, and theoperating mechanism part 4 can be inhibited from being bent, whereby the moldedvacuum valve 1 or thevacuum circuit breaker 30A mounted with the moldedvacuum valve 1 can be reduced in size, and a reliability to the operation of opening or closing thevacuum circuit breaker 30A can be further improved. -
FIG. 2 is a partial cross-sectional view of a vacuum circuit breaker of a second example useful to understand the present invention. Descriptions of the same parts as the first example will be omitted. - A
vacuum circuit breaker 30B of the present example shown inFIG. 2 is constructed in such a way that the fixingmember 19 extends over themold part 1A on a periphery of thevacuum valve 1 and theoperating mechanism part 4 at a plurality of positions. - Namely, the fixing
member 19 is plurally arranged and therespective fixing members mold part 1A of thevacuum valve 1 and theoperating mechanism part 4 and are fixed to a plurality ofmold protruding portions mold part 1A of thevacuum valve 1 in such a way as to protrude, and to the case of theoperating mechanism part 4 withbolts - The
vacuum circuit breaker 30B of the present example constructed in this manner receives the driving force of theoperating mechanism part 4, that is, a stress due to an impact and a vibration caused by an operation of opening or closing thevacuum circuit breaker 30B by two fixingmembers member 19 can be reduced more than the first example. Hence, a trouble such that thebolts vacuum valve 1 and the case of theoperating mechanismpart 4 are loosened or a trouble such that theoperating mechanism part 4 is bent can be inhibited more than the first example. Therefore, a reliability to the operation of opening or closing the moldedvacuum valve 1 or thevacuum circuit breaker 30B mounted with the moldedvacuum valve 1 can be further improved. -
FIG. 3 is a partial cross-sectional view of a vacuum circuit breaker of a third example useful to understand the present invention . Descriptions of the same parts as the first example will be omitted. - In a
vacuum circuit breaker 30C of the present example shown inFIG. 3 , the fixingmember 19 is arranged also on a side surface of the fixedside cable bushing 2 located on a side opposite to theoperating mechanism part 4. - Namely, the fixing
member 19 is extended in an axial direction and is bent inside by approximately 90 degrees at a position over the fixedside cable bushing 2, and this bent fixing member 19' is fixed to amold protruding portion 20c, which is formed in a mold part to cover a periphery of the fixedcable bushing 2 and in which an insert nut is embedded, by abolt 21e of a fastening means. The other construction is the same as the first example. - The fixing
member 19 is extended in the axial direction and intersects the fixedside cable bushing 2, which can be realized by forming a through hole through which the fixingmember 19 can be passed in the fixedside cable bushing 2. Further, the fixingmember 19 can also be arranged in such a way that the fixingmember 19 does not intersect the fixedside cable bushing 2 and avoids the fixedside cable bushing 2. - The
vacuum circuit breaker 30C of the present example constructed in this manner has the bent fixing member 19' and hence can disperse the driving force of theoperating mechanism part 4, that is, the stress due to an impact and a vibration caused by the operation of opening or closing thevacuum circuit breaker 30C more than the first example. Hence, a trouble such that thebolts vacuum valve 1 and the case of theoperating mechanism part 4 are loosened or a trouble such that theoperating mechanism part 4 is bent can be inhibited more than the first example. Therefore, a reliability to the operation of opening or closing the moldedvacuum valve 1 or thevacuum circuit breaker 30C mounted with the moldedvacuum valve 1 can be further improved. - Although a case where one fixing
member 19 is arranged has been shown in the present example, in a case where a plurality of fixingmembers 19 are arranged, it is clear that an effect of improving the reliability becomes more remarkable. -
FIG. 4 is a partial cross-sectional view of a vacuum circuit breaker of a first embodiment of the present invention. Descriptions of the same parts as the first example will be omitted. - In a
vacuum circuit breaker 30D of the present embodiment shown inFIG. 4 , as is the case with the first example, a portion on avacuum valve 1 side of the fixingmember 19 is fixed to the mold protruding portion by a bolt and a portion on anoperating mechanism part 4 side of the fixingmember 19 is directly fixed to the case of theoperating mechanism part 4 bybolts bolt 21a to fix the fixingmember 19 by the mold protruding portion located on a periphery of the floatingpotential metal 11 is aninspection bolt 22 to inspect a pressure (degree of vacuum) in thevacuum valve 1. Thisinspection bolt 22 and aninspection insert nut 23, which pairs with theinspection bolt 22, fix the fixingmember 19 ataposition separated from the floatingpotential metal 11 by a predetermined distance. Theinspection bolt 22 and theinspection insert nut 23 are electrically insulated from the fixingmember 19 via an insulatingmember 24. - Further, the
inspection bolt 22 has apressure monitoring device 25, which detects a potential increase in the floatingpotential metal 11 when the pressure in thevacuum valve 1 increases, connected thereto, and has adetermination device 26 which determines whether or not the internal pressure in thevacuum valve 1 is abnormal from an inspection signal detected by thepressure monitoring device 25. - The
pressure monitoring device 25 is constructed of: aconnection line 25a which is connected to at least one of theinspection bolt 22 and theinspection insert nut 23; a plurality of insulating components (for example, capacitors) 25b1, 25b2 which are connected partially in series to at least one of theinspection bolt 22 and theinspection insert nut 23 via theconnection line 25a; and apotential measuring device 25c which is connected between the plurality of insulating components 25b1, 25b2. Then, of the plurality of insulating components 25b1, 25b2 which are connected partially in series to at least one of theinspection bolt 22 and theinspection insert nut 23, the insulating component 25b2 which is different from the insulating component 25b1 located close to theinspection bolt 22 and theinspection insert nut 23 is connected to a potential fixed point (earth) 25b. - The
vacuum circuit breaker 30D of the present embodiment constructed in this manner has thepressure monitoring device 25 connected to theinspection bolt 22, so in a case where a pressure deterioration is caused in thevacuum valve 1 and hence a potential is generated on theinspection bolt 22, thevacuum circuit breaker 30D can monitor whether or not the internal pressure in thevacuum valve 1 is abnormal. - Here, a case where the pressure deterioration in the
vacuum valve 1 is caused, that is, a case where a pressure in a vacuum vessel increases will be described. - In general, a pressure increase in a vacuum vessel is mainly caused by a gas permeation from the outside of the vacuum vessel, a gas emission from an internal member of the vacuum vessel, and a pinhole rarely caused in the
bellows 9 and a bonded portion, and as shown by a Paschen's curve which expresses a relationship between a pressure in a vacuum vessel and a discharge start voltage and is shown inFIG. 5 , when the pressure in the vacuum vessel becomes 10-1 Pa or more, an insulation performance starts to quickly decrease. - When the
vacuum circuit breaker 30D mounted with thevacuum valve 1 is in a normal operating state, if a pressure increase is caused in thevacuum valve 1 and the insulation performance is decreased, a discharge occurs between a main circuit, which is composed of the fixedside conductor 7, the fixedside electrode 12, themovable side conductor 10, and themovable side electrode 13, and the floatingpotential metal 11 which is electrically insulated from the main circuit. - A potential of the floating
potential metal 11 at the time of a normal operation when the pressure increase is not caused in thevacuum valve 1 is roughly determined by an operating voltage, a structure of thevacuum valve 1, and an arrangement of a fixed potential member on a periphery of the vacuum valve 1 (for example, a case or a floor of a vehicle), whereas a potential of the floatingpotential metal 11 when the pressure increase is caused and a discharge occurs between the main circuit of thevacuum valve 1 and the floatingpotential metal 11 becomes a potential in which a discharge pulse is superimposed on the potential at the time of the normal operation. Further, when the pressure is more increased, an increased discharge pulse is superimposed on the potential and, finally, the potential of the floatingpotential metal 11 is increased to a state close to the operating voltage. - A potential increase in the floating
potential metal 11 when the pressure is increased in thevacuum valve 1 is detected by thepressure monitoring device 25 connected to theinspection bolt 22 and its detection signal is outputted to theexternal determination device 26, whereby the soundness of the internal pressure in the vacuum valve 1 (whether or not the internal pressure in thevacuum valve 1 is abnormal) can be gotten. - According to this
vacuum circuit breaker 30D of the present embodiment, not only the same effect as the first example can be produced but also the internal pressure in thevacuum valve 1 can be monitored. Hence, an insulation reliability of thevacuum valve 1 can be improved, in other words, the reliability of thevacuum circuit breaker 30D can be improved. -
FIG. 6 shows a vacuum circuit breaker of a second embodiment of the present invention and is a drawing corresponding to a cross section along a line A - A' inFIG. 2 . Descriptions of the same parts as the first embodiment will be omitted. - A
vacuum circuit breaker 30E of the present embodiment shown inFIG. 6 is constructed in such a way that the fixingmembers 19 are arranged at two portions and that these fixingmembers 19 extend over themold part 1A on the periphery of thevacuum valve 1 and over theoperating mechanism part 4. The fixingmembers 19, as is the case with the first embodiment, are fixed to themold part 1A on the periphery of thevacuum valve 1 and to the case of theoperating mechanism part 4, but the inspection insert nuts 23a, 23b which pair with theinspection bolts potential metal 11 by a predetermined distance. Theinspection bolts members 19 by the insulatingmember 24. - Further, in the present embodiment, the inspection insert nuts 23a, 23b which are different from each other in a total length are embedded respectively in the
mold protruding portion 20a. - The
vacuum circuit breaker 30E of the present embodiment constructed in this manner can produce the same effect as the first example, which is needless to say, and distances between the floatingpotential metal 11 of thevacuum valve 1 and the inspection insert nuts 23a, 23b are different from each other, in other words, distances L1 and L2 shown inFIG. 6 are different from each other, so potentials generated at theinspection bolts - In
FIG. 6 , thevacuum circuit breaker 30E is constructed in such a way that a distance between theinspection insert nut 23a on an upper side and the floatingpotential metal 11 of thevacuum valve 1 is shorter than a distance between theinspection insert nut 23b on a lower side and the floatingpotential metal 11 of thevacuum valve 1. When the internal pressure in thevacuum valve 1 increases, first, a potential of theinspection insert nut 23a on the upper side increases. Further, when the internal pressure in thevacuum valve 1 increases, a potential of theinspection insert nut 23b on the lower side increases. If a relationship between an increase in the internal pressure in thevacuum valve 1 and an increase in the potential of the inspection insert nuts 23a, 23b is gotten in advance, the potentials of theinsert nuts vacuum valve 1 can be gotten. - Two
inspection bolts vacuum valve 1 can be improved according to the number of the inspection bolts. -
FIG. 7 is a partial cross-sectional view of a vacuum circuit breaker of a third embodiment of the present invention. Descriptions of the same parts as the first example and the first embodiment will be omitted. - In a
vacuum circuit breaker 30F of the present embodiment shown inFIG. 7 , a set of one inspection bolt 22a1 (or 22a2, 22a3) and one inspection insert nut 23a1 (or 23a2, 23a3) which pairs with the one inspection bolt 22a1 (or 22a2, 22a3) are arranged plurally (in the present embodiment, by three) on themold part 1A of the periphery of thevacuum valve 1 and in an axial direction of the floatingpotential metal 11, and the three inspection insert nuts 23a1, 23a2, 23a3 arranged in the axial direction of the floatingpotential metal 11 are arranged in such a way that distances between the three inspection insert nuts 23a1, 23a2, 23a3 and the floatingpotential metal 11 are different from each other. - Specifically, the fixing
member 19 is constructed in a such a way as to extend over themold part 1A on the periphery of thevacuum valve 1 and over theoperating mechanism part 4 and the fixingmember 19 is fixed to themold part 1A on the periphery of thevacuum valve 1 and to the case of theoperating mechanism part 4. At this time, the fixingmember 19 arranged on the periphery of the floatingpotential metal 11 is fixed to themold part 1A on the periphery of thevacuum valve 1 at three portions by the inspection bolts 22a1, 22a2, 22a3 and the inspection insert nuts 23a1, 23a2, 23a3, which pair with the inspection bolts 22a1, 22a2, 22a3, in such a way that the inspection insert nuts 23a1, 23a2, 23a3 are different from each other in a distance from the floatingpotential metal 11. - The respective inspection bolts 22a1, 22a2, 22a3 and the respective inspection insert nuts 23a1, 23a2, 23a3 are electrically insulated from the fixing
member 19 by the insulatingmember 24. - Further, in the present embodiment, the inspection insert nuts 23a1, 23a2, 23a3, which are different from each other in a total length, are respectively embedded in protruding parts 20a1, 20a2, 20a3 of the
mold part 1A on the periphery of thevacuum valve 1. - The
vacuum circuit breaker 30F of the present embodiment constructed in this manner can produce the same effect as the first example, which is needless to say, and since the distances between the floatingpotential metal 11 of thevacuum valve 1 and the respective inspection insert nuts 23a1, 23a2, 23a3 are different from each other, the potentials generated at the inspection bolts 22a1, 22a2, 22a3 can be made different from each other. - For example, in
FIG. 7 , a distance between the inspection insert nut 23a1 on the left side and the floatingpotential metal 11 of thevacuum valve 1 is the shortest, and a distance between the inspection insert nut 23a2 and the floatingpotential metal 11 of thevacuum valve 1 is shorter, and then a distance between the inspection insert nut 23a3 on the right side and the floatingpotential metal 11 of thevacuum valve 1 is long. When the internal pressure in thevacuum valve 1 increases, first, the potential of the inspection insert nut 23a1 on the left side increases, and when the internal pressure in thevacuum valve 1 increases more, the potential of the inspection insert nut 23a2 increases, and when the internal pressure in thevacuum valve 1 increases still more, the potential of the inspection insert nut 23a3 increases. If a relationship between an increase in the internal pressure in thevacuum valve 1 and an increase in the potential of the inspection insert nuts 23a1, 23a2, 23a3 is gotten in advance, the potentials of the insert nuts 23a1, 23a2, 23a3 become a simple pressure gage and hence a degree of deterioration of the internal pressure in thevacuum valve 1 can be gotten. - Three inspection bolts 22a1, 22a2, 22a3 are shown in the present embodiment, but when the inspection bolts are arranged additionally in the axial direction, an accuracy of measuring the internal pressure in the
vacuum valve 1 can be improved according to the number of the inspection bolts. - The above-mentioned embodiments have been described in detail so as to explain the present invention in a way that is easy to understand, and the present invention is not necessarily limited to a vacuum circuit breaker having the whole construction described above. Further, a portion of the construction of one embodiment can be replaced by the construction of the other embodiment, and the construction of one embodiment can be added to the construction of the other embodiment. Still further, in a portion of the construction of each embodiment, the construction of one embodiment can be added to or deleted from or replaced with the construction of the other embodiment.
-
- 1---vacuum valve
- 1A---mold part of vacuum valve
- 2---fixed side cable bushing
- 3---movable side cable bushing
- 4---operating mechanism part
- 5---cylindrical insulating member
- 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---operating insulating rod
- 15---fixed side cable bushing conductor
- 16---movable side cable bushing conductor
- 17---contactor
- 18---insulating gas
- 19, 19a, 19b---fixing member
- 19'---bent fixing member
- 20a, 20b, 20c, 20a1, 20a2, 20a3---mold protruding portion
- 21a, 21b, 21c, 21d, 21e---bolt
- 22, 22a, 22b, 22a1, 22a2, 22a3---inspection bolt
- 23, 23a, 23b, 23a1, 23a2, 23a3---inspection insert nut
- 24---insulating member
- 25---pressure monitoring device
- 25a---connection line
- 25b1, 25b2---insulating component
- 25c---potential measuring device
- 25d---potential fixed point
- 26---determination device
- 30A, 30B, 30C, 30D, 30E, 30F---vacuum circuit breaker
Claims (6)
- A vacuum circuit breaker (30D; 30E; 30F) comprising
a vacuum valve (1), in which at least a fixed side electrode (12) and a movable side electrode (13) are stored and whose periphery is covered with a mold part (1A), and
an operating mechanism part (4) which drives the movable side electrode (13),
wherein
the vacuum valve (1) and the operating mechanism part (4) are arranged on a straight line,
a fixing member (19) which extends over and fixes the mold part (1A) of the vacuum valve (1) and the operating mechanism part (4) is provided,
the fixing member (19) is fixed to a plurality of mold protruding portions (20a, 20b; 20a1, 20a2, 20a3), which are provided on a side surface of the mold part (1A) of the vacuum valve (1) in such a way as to protrude, and to the operating mechanism part (4) with fastening means (21b, 21c, 21d; 22; 22a, 22b; 22a1, 22a2, 22a3),
the vacuum valve (1) is constructed of:a fixed side end plate (6) which is bonded to one end of a cylindrical insulating member (5);a fixed side conductor (7) which airtightly passes through the fixed side end plate (6);a movable side end plate (8) which is bonded to the other end of the cylindrical insulating member (5);a bellows (9) whose one end is bonded to the movable side end plate (8) and which allows a movable part to move; anda movable side conductor (10) which airtightly passes through the bellows (9) and moves in an axial direction while keeping a vacuum, andin the vacuum valve (1), a floating potential metal (11) supported by the cylindrical insulating member (5), the fixed side electrode (12) connected to an end portion of the fixed side conductor (7), and the movable side electrode (13) connected to an end portion of the movable side conductor (10) are arranged,
characterized in that
the fastening means, which fixes the fixing member (19) to the mold protruding portion (20a; 20a1, 20a2, 20a3) located on a periphery of the floating potential metal (11), is an inspection bolt (22; 22a, 22b; 22a1, 22a2, 22a3),
the inspection bolt (22; 22a, 22b; 22a1, 22a2, 22a3) and an inspection insert nut (23; 23a, 23b; 23a1, 23a2, 23a3), which pairs with the inspection bolt (22; 22a, 22b; 22a1, 22a2, 22a3), fix the fixing member (19) at a position separated from the floating potential metal (11) by a predetermined distance, and
the inspection bolt (22; 22a, 22b; 22a1, 22a2, 22a3) and the inspection insert nut (23; 23a, 23b; 23a1, 23a2, 23a3) are electrically insulated from each other via an insulating member (24). - The vacuum circuit breaker (30D) according to claim 1, comprising:a pressure monitoring device (25) which is connected to the inspection bolt (22) and which detects a potential increase of the floating potential metal (11) when an internal pressure in the vacuum valve (1) increases; anda determination device (26) which determines whether or not the internal pressure in the vacuum valve (1) is abnormal from a detection signal detected by the pressure monitoring device (25).
- The vacuum circuit breaker (30D) according to claim 2, characterized in that
the pressure monitoring device (25) is constructed of:a connection line (25a) which is connected to at least one of the inspection bolt (22) and the inspection insert nut (23);a plurality of insulating components (25b1, 25b2) which are connected partially in series to at least one of the inspection bolt (22) and the inspection insert nut (23) via the connection line (25a); anda potential measuring device (25c) which is connected between the plurality of insulating components (25b1, 25b2), andof the plurality of insulating components (25b1, 25b2) which are connected partially in series to at least one of the inspection bolt (22) and the inspection insert nut (23), the insulating component (25b2), which is different from the insulating component (25b1) located close to the inspection bolt (22) and the inspection insert nut (23), is connected to a potential fixed point (25d). - The vacuum circuit breaker (30E; 30F) according to claim 1, characterized in that the inspection bolt (22a, 22b; 22a1, 22a2, 22a3) and the inspection insert nut (23a, 23b; 23a1, 23a2, 23a3) are plurally arranged in a peripheral direction or in the axial direction of the floating potential metal (11).
- The vacuum circuit breaker (30E; 30F) according to claim 1, characterized in that the plurality of inspection insert nuts (23a, 23b; 23a1, 23a2, 23a3) arranged in the peripheral direction or in the axial direction of the floating potential metal (11) are arranged in such a way as to be different from each other in a distance from the floating potential metal (11).
- The vacuum circuit breaker (30D; 30E; 30F) according to claim 1, characterized in that
the fixing member (19) is plurally arranged, and
the respective fixing members (19) extend over the mold part (1A) of the vacuum valve (1) and over the operating mechanism part (4) and are fixed to a plurality of mold protruding portions (20a, 20b; 20a1, 20a2, 20a3), which are provided on a side surface of the mold part (1A) of the vacuum valve (1) in such a way as to protrude, and to the operating mechanism part (4) with the fastening means (21b, 21c, 21d; 22; 22a, 22b; 22a1, 22a2, 22a3).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP2017040226A JP6776156B2 (en) | 2017-03-03 | 2017-03-03 | Vacuum breaker |
Publications (2)
Publication Number | Publication Date |
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EP3370243A1 EP3370243A1 (en) | 2018-09-05 |
EP3370243B1 true EP3370243B1 (en) | 2019-07-17 |
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EP18156010.3A Active EP3370243B1 (en) | 2017-03-03 | 2018-02-09 | Vacuum circuit breaker |
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EP (1) | EP3370243B1 (en) |
JP (1) | JP6776156B2 (en) |
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DE102014210587A1 (en) * | 2014-06-04 | 2015-12-17 | Siemens Aktiengesellschaft | Process for the production of a solid-insulated switch pole and solid-insulated switch pole |
CN109490934B (en) * | 2018-12-19 | 2022-11-25 | 上海平高天灵开关有限公司 | X-ray detection platform for vacuum arc-extinguishing chamber |
CN116261766A (en) | 2021-05-18 | 2023-06-13 | 株式会社日立产机系统 | Manipulator |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3471669A (en) * | 1968-01-16 | 1969-10-07 | Chance Co Ab | Encapsulated switch assembly for underground electric distribution service |
JPH07211202A (en) * | 1994-01-20 | 1995-08-11 | Hitachi Ltd | Vacuum contactor |
FR2809861B1 (en) * | 2000-05-30 | 2002-07-12 | Alstom | CHASSIS FOR A VACUUM BULB OF A POWER SWITCH MODULE |
JP4247009B2 (en) | 2002-03-06 | 2009-04-02 | 株式会社東芝 | Switchgear |
JP4483645B2 (en) * | 2005-03-23 | 2010-06-16 | 三菱電機株式会社 | Switchgear |
US7397012B2 (en) * | 2005-05-31 | 2008-07-08 | Thomas & Betts International, Inc. | High current switch and method of operation |
DE202006008708U1 (en) * | 2006-05-29 | 2006-08-17 | Siemens Ag | Pole unit for vacuum circuit breaker, has guide retainer and insulating body that are fastened to retaining unit of pole carrier by screws, where galvanic connection is provided between pole carrier and screws |
WO2014080655A1 (en) * | 2012-11-21 | 2014-05-30 | 三菱電機株式会社 | Switch |
BR112016026349B1 (en) * | 2014-05-12 | 2022-11-22 | Cooper Technologies Company | SYSTEM FOR DETECTING A VACUUM SWITCH, METHOD FOR DETECTING A LOSS OF VACUUM IN A VACUUM SWITCH, VACUUM SWITCH AND SYSTEM |
US9396896B2 (en) * | 2014-06-09 | 2016-07-19 | Eaton Corporation | Modular vacuum interruption apparatus |
CN105280431B (en) * | 2015-10-21 | 2017-11-17 | 福州大学 | Electromagnetic reluctance pulling force fast arc extinction earthed switch |
CN105428149B (en) * | 2015-12-22 | 2018-02-09 | 福州大学 | Direct-connected double arc extinguishing chambers formula high voltage fast transfer switch |
-
2017
- 2017-03-03 JP JP2017040226A patent/JP6776156B2/en active Active
-
2018
- 2018-02-09 EP EP18156010.3A patent/EP3370243B1/en active Active
- 2018-02-12 CN CN201810145235.8A patent/CN108538680B/en active Active
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CN108538680A (en) | 2018-09-14 |
EP3370243A1 (en) | 2018-09-05 |
CN108538680B (en) | 2019-12-03 |
JP2018147643A (en) | 2018-09-20 |
JP6776156B2 (en) | 2020-10-28 |
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