JP2007189798A - Gas circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the deterioration of insulation performance and the corrosion of a device by adsorbing a cracked gas containing iodine, a hydrogen fluoride (HF), a hydrogen iodide (HI) and the like that are generated at the current blockage and the insulation breakage of a gas blocker that uses CF<SB>3</SB>I or a mixed gas containing CF<SB>3</SB>I as an alternative gas of SF<SB>6</SB>. <P>SOLUTION: An absorbent composed of iodine and the cracked gas with activated carbon, Zeolam(R), an ion-exchange resin or the like as the absorbent is applied and stored in a passage through which the CF<SB>3</SB>I of the circuit breaker or the mixed gas containing the CF<SB>3</SB>I moves, or in a region where the gas is retained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a gas circuit breaker using a mixed gas containing trifluoroiodomethane (CF ₃ I) or CF ₃ I as an alternative gas to sulfur hexafluoride (SF ₆ ), which is an insulating gas. _{3 I} decomposition to iodine and hydrogen fluoride generated (HF), relates to the removal of the decomposition gas containing hydrogen iodide (HI) or the like.

In general, sulfur hexafluoride (SF ₆ ) is widely used as an insulating gas for gas circuit breakers. In addition to excellent insulation performance, SF ₆ gas has industrially excellent characteristics such as non-toxicity and inactivity. However, because the global warming potential is very high, 23,900 times that of CO _{2 in} 100-year conversion, it was designated as a global warming gas at the Kyoto Conference on Global Warming Prevention (COP3) held in 1997. And from the viewpoint of environmental protection, an alternative gas of SF ₆ gas has been studied, and attention has been focused on CF ₃ I gas having a global warming potential of 5 or less, an extremely low ozone destruction coefficient, and a small environmental load.

In Patent Document 2 below, in a gas-insulated electrical apparatus having a switch that opens and closes an electric circuit and a current-carrying path that does not have a switching point and is electrically insulated by an insulating gas, the current-carrying path is used as an alternative gas for SF ₆ gas. A gas-insulated electrical device is disclosed in which a mixed gas of CF ₃ I and N ₂ is enclosed, and the switch is filled with SF ₆ gas having a high shut-off property different from that of the current path.

The applicant has already proposed a gas that is a mixture of CF ₃ I gas and CO ₂ gas, which has both high insulation and barrier properties and is practical even at the liquefaction temperature, as a substitute gas for SF ₆ gas. -268058 has been filed.

  On the other hand, various types of gas circuit breakers are used. The gas circuit breaker shown in FIG. 2 is shown in the following Patent Document 1 (FIG. 4) and is currently widely used. This is a puffer type circuit breaker. This gas circuit breaker moves the operating rod 5 during the opening operation to separate the movable contact 2 from the fixed contact 3 and to remove the arc extinguishing gas in the puffer chamber 8 from the cylinder 4 and the piston. 9 is compressed by the relative movement of 9, and is ejected as a high-speed gas flow by the first and second insulating nozzles 6 and 7, and is blown substantially perpendicular to the arc AC to extinguish the arc.

  As another example of a conventional circuit breaker, FIG. 3 shows a closed state and FIG. 4 shows an open state. In the closed state, this gas circuit breaker The cylindrical conductor 42, the first conductor plate 41, the first fixed contact 10, the movable contact 30, the second fixed contact 20, and the second conductor plate 51 are connected to the second conductor plate 50.

When the driving device 1 operates and the cylinder 70 moves to the right side, the movable contact 30 stored in the inner wall portion of the cylinder 70 moves to the right simultaneously with the cylinder 70, and the movable contact 30 and the second fixed contact 20 are moved. An electric arc is generated between the two contacts. At the same time, the first gas chamber A is compressed, and the blocking gas (SF ₆ ) is injected from the nozzle 731 provided on the inner wall 73 of the cylinder 70 so that the arc is extinguished.
JP 05-166442 A JP 2000-164040 A

However, when a mixed gas of CF ₃ I and N _{2 or} a mixed gas of CF ₃ I and CO ₂ used as a substitute gas for the SF6 is used for a gas circuit breaker, CF ₃ I is used at the time of current interruption or dielectric breakdown. A part of the gas is decomposed to generate cracked gas containing iodine, hydrogen fluoride (HF), hydrogen iodide (HI) and the like. Among these, iodine causes a problem that the insulating performance is deteriorated by adhering or filling the nozzle 731 of the gas circuit breaker, the arc extinguishing chamber (G), or the like. In addition, cracked gas containing hydrogen fluoride (HF), hydrogen iodide (HI), etc. may significantly deteriorate the properties of insulating gas and insulating gas of mixed gas containing CF ₃ I, or cause corrosion inside the device. It becomes.

A first invention that solves the above-mentioned problems is a gas circuit breaker that uses a mixed gas containing trifluoroiodomethane (CF ₃ I) or CF ₃ I as an insulating or circuit breaker gas, and an adsorbent is used as the gas circuit breaker. A gas circuit breaker characterized in that it is laid or stored in a passage where the gas moves or a portion where the gas stays.

  According to a second invention, in the first invention, the site where the adsorbent is laid or stored is at least the inner wall surface of the cylindrical first fixed contact and / or the end extension chamber and the second fixed contact and / or Alternatively, the gas circuit breaker is an end expansion chamber.

  A third invention is the gas circuit breaker according to the first invention, wherein the site where the adsorbent is laid or stored is at least the inner wall surfaces of the first and second conductor plates.

  A fourth invention is the gas circuit breaker according to the first invention, wherein the site where the adsorbent is laid or stored is at least the inner wall surface of the outer cylinder.

  According to a fifth invention, in the first invention, the circuit breaker in which the adsorbent is laid or stored is a puffer-type gas circuit breaker that raises the blowing pressure by a driving force when the adsorbent is cut off, and blows off the exhaust gas after arc extinguishing to the outer periphery A gas circuit breaker characterized by having a structure in which gas is blown in the direction of the center of both electrodes, not the structure.

  A sixth invention is the invention according to any one of the first to fifth aspects, wherein the adsorbent is a porous inorganic compound such as zeolite, alumina, silica, silica alumina, titania, magnesia, zirconia, ion exchange resin, activated carbon A gas circuit breaker characterized by being any one of graphite or a combination of any two or more thereof.

  For laying or storing the adsorbent, the adsorbent may be sprayed or applied to the wall surface with a binder. Alternatively, it may be formed into a thin plate shape, or mechanically attached in a container that can contact gas, for example, a metal mesh having a small mesh or a porous bag.

  The adsorbent can be used in various shapes such as powder, granules, granules, and crushed products. Moreover, a commercial item can be used as it is.

According to the present invention, in a gas circuit breaker that uses a mixed gas containing CF ₃ I gas or CF ₃ I as an alternative gas for SF ₆ as an insulating or circuit breaker gas in the gas circuit breaker, the adsorbent is a gas of the gas circuit breaker. By laying / storing in the path where the gas moves or where it stays, adsorption and removal of decomposition gas containing iodine, hydrogen fluoride (HF), hydrogen iodide (HI), etc., generated during current interruption or dielectric breakdown be able to. As a result, it is eliminated that iodine and decomposition gas generated by the decomposition of CF ₃ I are attached to or filled in the nozzle, the arc extinguishing chamber, etc., and there is an effect that deterioration of insulation and corrosion of the apparatus are prevented. .

  Furthermore, since various kinds of commercially available adsorbents can be used, there is an effect that it can be carried out simply and inexpensively.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory view of a main part of a gas circuit breaker according to an embodiment of the present invention, showing an open state, and is adsorbed by a gas circuit breaker according to another conventional example shown in FIGS. The agent is laid or stored. 1, 3, and 4 are assigned the same reference numerals. In FIG. 1, 10 is a cylindrical first fixed contact located on the right side, 20 is a cylindrical second fixed terminal whose left end cross-sectional shape is enlarged in a trapezoidal shape, and 30 is a cross-sectional shape that is vertically opposed to each other. It is a U-shaped movable contact. A cylinder 70 composed of an inner wall 73, an outer peripheral wall 74, and partition walls 72, 71 constituting the left and right walls thereof is formed outside the first fixed contact 10 and the second fixed contact 20, and a donut-shaped piston is formed inside the cylinder 70. 60 is housed, and the piston 60 is fixed to the right first conductive plate 41 by a plurality of piston rods 61.

  The movable terminal 30 is housed in the central portion of the inner wall 73 of the cylinder 70, and a nozzle 731 having a plurality of small holes is provided on the wall surface on the left side of the inner wall 73. A first gas chamber A is formed on the left side of the piston 70 and a second gas chamber B is formed on the right side. The seventh gas chamber G is formed by the nozzle portion 731 and the cylindrical interiors of the first and second fixed contacts 10 and 20. Is formed. An insulating cylinder 80 is coaxially provided outside the cylinder 70, and conductor plates 51 and 41 are attached to the left and right ends thereof. A third gas chamber C is formed between the insulating cylinder 80 and the cylinder 70. The conductor plate 51 is connected to an expanded portion in which the diameter of the second fixed contact 20 is enlarged, and the first conductor plate 41 is connected to the right end of the first fixed contact 10.

  An outer cylinder 90 is provided outside the insulating cylinder 80 coaxially with the insulating cylinder 80, a U-shaped partition plate 93 is provided on the left side, a partition plate 92 is provided on the right end, and a partition plate 95 is provided on the upper side. It has been.

  Further, an end cap 83 composed of two cylindrical parts is attached to the left side of the left second conductor 51, and a partition plate 82 is provided inside the right cylindrical conductor 42.

  The expansion portion 21 at the left end of the second stationary contact 20 forms an eighth gas chamber (expansion chamber), and the expansion portion 21 is provided with a plurality of small holes 211 to provide the eighth gas chamber H and the third gas chamber. C communicates with each other, a plurality of small holes 811 are provided on the right side of the outer peripheral wall 81 of the insulating cylinder 80, the third gas chamber C communicates with the fifth gas chamber E, and the partition wall 71 on the right side of the cylinder 70 is communicated with. A plurality of small holes 711 are also provided, and the second gas chamber B and the third gas chamber C communicate with each other. A fifth gas chamber E is formed between the insulating cylinder 80 and the outer cylinder 90, and a sixth gas chamber (expansion chamber) F formed by expanding the internal passage of the first contactor 10 on the left side of the partition plate 82. However, a fourth gas chamber D is formed on the right side.

  A plurality of small holes 821 are provided in the partition plate 82, the sixth gas chamber (expansion chamber) F and the fourth gas chamber D communicate with each other, and the fourth gas chamber D and the fifth gas chamber E are cylindrical. The conductor 42 communicates with the partition plate 92 through a gap 421. One end of the first conductor 40 is connected to the cylindrical conductor plate 42, the other end passes through the partition plate 95, and is connected to the outside of the gas circuit breaker. One end of the second conductor 50 is connected to the second conductor 51, and the other end However, it passes through the end cap 83 and the partition plate 94 and is drawn out of the gas circuit breaker.

  Next, laying or storing the adsorbent in the gas circuit breaker will be described.

  In FIG. 1, P is an inner surface of the first fixed contact 10 and the second contact 20, that is, a region surrounding the sixth gas chamber G, and Q is a right side surface of the first conductor plate 41 and the cylindrical conductor 42. This is an area surrounding the inner surface and the left side surface of the partition plate 82, that is, the sixth gas chamber F.

  R is a left side surface of the first conductor plate 41 excluding the inner surface of the outer peripheral wall 81 of the insulating cylinder 80 and a right side surface of the second conductor plate 51, that is, a region surrounding the third gas chamber C, and S is located on the left side. The inner surface of the outer peripheral wall 91 of the outer cylinder 90 excluding the lower surface of the partition plate 95 positioned above the right side surface of the U-shaped partition plate 93 and the left side surface of the partition plate 92 positioned on the right side, that is, the fifth gas chamber E. T is an area surrounding the inner surface of the extension 21 at the left end of the second fixed contact 20 and the right side of the second conductor plate 51, that is, the eighth gas chamber H. For these areas, iodine and adsorbents to be adsorbed are laid or stored.

  The laying / storing may be performed only for the region P, the region T, and the region Q (hereinafter, this combined region is referred to as “region X”), the region X may be combined with the region R, and the region X and the region may be combined. A combination of R and region S may be used.

  Area H and area Q are relatively close to the arc extinguishing part, the flow velocity is lower than the cylindrical shape of the first and second stationary contacts 10 and 20, and the gas temperature is also lowered. It is advantageous.

  For laying or storing the adsorbent, the adsorbent may be sprayed or applied to the wall surface with a binder. Alternatively, it may be formed into a thin plate shape, or mechanically attached in a container that can contact gas, for example, a metal mesh having a small mesh or a porous bag.

  As an adsorbent, one or more of porous inorganic compounds such as zeolite, alumina, silica, silica alumina, titania, magnesia, and zirconia, ion exchange resin, activated carbon, and graphite, or a combination of any two or more thereof are used. be able to.

  Further, the adsorbent can be used in various shapes such as powder, granules, granules, and crushed products, and commercially available products can be used as they are.

  In addition, the adsorbent should be installed or stored at a position where it can be replaced from the outside in consideration of the structure of the gas circuit breaker in consideration of maintenance, and should be taken into account when designing the structure and parts of the gas circuit breaker to facilitate maintenance. Is preferred.

Although already mentioned in the description of the gas circuit breaker according to the conventional example, the flow of gas containing CF ₃ I when the gas circuit breaker is opened will be described. In FIG. 1, when the cylinder 70 moves to the right side from the closed state (see FIG. 3) by the operation of the driving device 1, the movable contact 30 moves to the right side to open the pole, and the current is cut off. An electric arc is generated between the fixed contact 10 and the second fixed contact 20. On the other hand, the first gas chamber A is compressed, gas is injected from the nozzle 731 provided on the inner wall 73 of the cylinder 70 at a high speed, and the generated electric arc is extinguished. Thereafter, a part of the gas flows at a high speed to the left inside the second fixed contact 20, flows into the eighth gas chamber (expansion chamber) H, and is decelerated. To the right between the cylinder 70 and the insulating cylinder 80 and flows into the fifth gas chamber E through a plurality of small holes 811 provided in the outer peripheral wall 81 of the insulating cylinder 80. The other remaining gas injected from the nozzle 731 flows to the right inside the first fixed contact 10, flows into the sixth gas chamber F, expands, and is decelerated from the plurality of small holes 821 of the partition plate 82. It flows into the fourth gas chamber D and flows into the fifth gas chamber E through the gap between the cylindrical conductor 42 and the partition plate 92. At this time, the pressure in the second gas chamber B decreases, but gas flows in from the plurality of small holes 711 provided in the partition wall 71 on the right side of the cylinder 70, and the decrease in pressure remains at a predetermined value.

  When the cylinder 70 moves to the left side and closes due to the operation of the driving device 1, the pressure in the first gas chamber A decreases, while the pressure in the second gas chamber B increases, and the gas flow at the time of opening is as described above. It returns to the original state by the reverse flow.

The arc generated during opening, by decomposing CF 3 _I gas, iodine and hydrogen fluoride (HF), but decomposition gas containing hydrogen iodide (HI) or the like is generated, as described above, areas P~ region By installing or storing an adsorbent in T, iodine and cracked gas are adsorbed and removed, preventing iodine and cracked gas from adhering to or filling the nozzle 731 and arc extinguishing chamber (G), etc., and insulating performance It is possible to prevent deterioration of the device and corrosion of the device.

  Further, in the present embodiment, in the so-called puffer type gas circuit breaker, iodine and hydrogen fluoride (HF), iodination are similarly performed by laying and storing an adsorbent on the inner wall surface of the gas chamber. Decomposition gas containing hydrogen (HI) or the like can be prevented from adhering to or filling a nozzle, arc extinguishing chamber, etc., and deterioration of insulation performance or corrosion of the apparatus can be prevented.

In addition, when CF ₃ I gas is decomposed due to dielectric breakdown and iodine and degassing are generated, an adsorbent such as activated carbon, zeolite or ion exchange resin is laid or stored on the wall around the CF ₃ I gas enclosure. By doing so, iodine and decomposition gas can be adsorbed and removed to prevent deterioration of insulation performance and corrosion of the apparatus.

It is explanatory drawing of the principal part of the gas circuit breaker which concerns on embodiment of this invention, and has shown the open-circuit state. It is explanatory drawing of the principal part in the opening state of the puffer type gas circuit breaker which concerns on a prior art example. It is explanatory drawing of the principal part in the closing state of the gas circuit breaker which concerns on another prior art example. It is explanatory drawing of the principal part in the opening state of the gas circuit breaker which concerns on another prior art example.

Explanation of symbols

1..Drive device 10..First fixed contact 20..Second fixed contact 21..Expansion portion
211 .. Small hole 30 .. movable contact 40 .. first conductor 41 .. first conductor plate 42 .. cylindrical conductor 50 .. second conductor 51 .. second conductor plate 60 .. piston 61. Piston rod 70 ・ ・ Cylinder 71 ・ ・ Partition wall
711 .. Small hole 72 .. Partition wall 73 .. Inner wall
731 ··· Nozzle 74 · · Outer wall 80 · · Insulating cylinder 81 · · Outer wall
811 ... Small hole 82 ... Partition plate
821 ·· Small hole 83 · · End cap 90 · · Outer tube 91 · · Outer wall 92 · · Partition plate (right)
93 ・ ・ U-shaped partition plate 94 ・ ・ Partition plate (left)
95. ・ Partition plate (top)
A ... First gas chamber B ... Second gas chamber C ... Third gas chamber D ... Fourth gas chamber E ... Fifth gas chamber F ... Sixth gas chamber (first fixed contact end) Expansion room)
G ... 7th gas chamber H ... 8th gas chamber (second fixed contact end expansion chamber)
PT ~ ・ Adsorbent laying / storage target area

Claims (6)

In a gas circuit breaker using a mixed gas containing trifluoroiodomethane (CF ₃ I) or CF ₃ I as an insulating or blocking gas, an adsorbent of decomposition gas such as iodine, hydrogen fluoride, and hydrogen iodide is used as the gas A gas circuit breaker characterized in that the gas circuit breaker is laid or stored in a passage in which the gas moves or a portion where the gas stays.   The site where the adsorbent is laid or stored is at least the inner wall surface and / or end extension chamber of the cylindrical first fixed contact and / or the end extension chamber of the second fixed contact. The gas circuit breaker according to claim 1.   2. The gas circuit breaker according to claim 1, wherein the site where the adsorbent is laid or stored is at least the inner wall surfaces of the first and second conductor plates.   The gas circuit breaker according to claim 1, wherein a part where the adsorbent is laid or stored is at least an inner wall surface of an outer cylinder.   The circuit breaker in which the adsorbent is laid or stored is a puffer type gas circuit breaker that increases the blowing pressure by the driving force at the time of breaking, and is not structured to blow off the exhaust gas after arc extinguishing to the outer periphery, but in the direction of the center of both electrodes The gas circuit breaker according to claim 1, wherein the gas circuit breaker is blown. The adsorbent is any one of porous inorganic compounds such as zeolite, alumina, silica, silica alumina, titania, magnesia, zirconia, ion exchange resin, activated carbon, graphite, or a combination of any two or more thereof. The gas circuit breaker according to any one of claims 1 to 5, wherein the gas circuit breaker is provided.

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