JP2015220841A - Air purification filter and switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: an air purification filter arranged so that an acid gas-removing performance can be retained without interruption; and a switchgear which enables the suppression of the drop in insulation resistance of an insulator, and the prolongation of a maintenance cycle.SOLUTION: An air purification filter according to the present invention comprises: at least one kind of water absorptive polymer selected from a group consisting of an acrylate based polymer, a crosslink product of an acrylate based polymer, a vinyl acetate-acrylic ester copolymer saponification product, an acrylate-acrylic amide copolymer, an acrylic acid-vinyl alcohol copolymer, a vinyl alcohol-acrylate based polymer, a starch-acrylate based copolymer, a polyvinyl alcohol-maleate anhydride reaction product, an isobutylene-maleic copolymer crosslink product, a polyethylene oxide modification product, and a starch-acrylonitrile graft copolymer; and at least one kind of carbonate selected from an alkali metal carbonate and alkali-earth metal carbonate.

Description

  The present invention relates to an air purification filter and a switch gear including the same.

  The switchgear is a device (switch) used in a power receiving / distributing facility that receives electrical energy sent from a power plant and supplies (distributs) power to a factory or a building. If an electrical trouble occurs in the switchgear, production loss may occur or the building or equipment needs to be repaired. Therefore, the switchgear avoids an electrical trouble and improves reliability and stability. It is required to secure and operate.

  In a switchgear, an insulator is used for several parts. One of the main causes of electrical troubles in the switchgear is deterioration of the insulator due to long-term use. Therefore, in order to avoid electrical troubles of the switchgear, it is important to suppress the deterioration of the insulator.

  In addition, periodic maintenance of switchgear is carried out to avoid electrical troubles, but a longer maintenance cycle is desired to reduce maintenance costs and production losses associated with power outages during maintenance. . Also from this point, it is important to suppress the deterioration of the insulator.

  It is generally considered that the deterioration of the insulator in the open type switchgear proceeds as follows. (1) Calcium carbonate or hydrated alumina contained in the insulator reacts with acidic gases such as NOx and SOx in the air to produce deliquescent compounds, thereby reducing the insulation resistance of the insulator and causing leakage. Electric current is generated. Generally, it is considered as follows. (2) Due to the generation of Joule heat due to leakage current, a local dry zone is formed in the insulator. (3) Scintillation discharge is generated by voltage concentration on the dry zone. (4) The organic matter in the insulator is carbonized by discharge, and a carbonized conductive path is formed, leading to dielectric breakdown.

  Therefore, as one method for suppressing the deterioration of the insulator in the open type switchgear, it is conceivable to remove acid gas in the air that triggers the deterioration.

  As a method for removing acid gas in the air, Patent Document 1 (Japanese Patent Laid-Open No. 2000-334244) discloses that an alkali metal carbonate or the like is fixed to a support surface using inorganic powder having pores such as silica gel as a binder. A method of using the inorganic material layer formed as an air purification filter has been proposed. In this method, the acidic gas is changed to nitrate or the like and removed by a chemical reaction between an alkali metal carbonate or the like in the inorganic material layer and an acidic gas (for example, NOx) in the air.

JP 2000-334244 A

  However, since the nitrate produced by the reaction remains on the surface of the alkali metal carbonate or the like, the alkali metal carbonate or the like that reacts with the acid gas is covered, and the acid gas removal performance decreases.

  The present invention has been made to solve the above-described problems, and is provided with an air purification filter capable of continuously maintaining the removal performance of acid gas, and insulation by including the air purification filter. An object of the present invention is to provide a switchgear capable of suppressing a decrease in insulation resistance of an object and extending a maintenance cycle.

  The air purification filter according to the present invention includes an acrylate polymer, a crosslinked acrylate polymer, a saponified vinyl acetate-acrylate copolymer, an acrylate-acrylamide copolymer, and an acrylate-vinyl. Alcohol copolymer, vinyl alcohol-acrylate polymer, starch-acrylate copolymer, polyvinyl alcohol-maleic anhydride reaction product, cross-linked isobutylene-maleic acid copolymer, polyethylene oxide modified product, And at least one water-absorbing polymer selected from the group consisting of starch-acrylonitrile graft copolymers, and at least one carbonate selected from alkali metal carbonates and alkaline earth metal carbonates. Is included.

  The switchgear according to the present invention includes a switchgear main body in which a busbar side conductor, a load side conductor, and a main circuit switch that contacts and separates the busbar side conductor and the load side conductor are housed in a housing. And a control device for monitoring control, wherein the air purification filter according to claim 1 or 2 is installed at an air intake port provided in the casing.

  ADVANTAGE OF THE INVENTION According to this invention, the fall of the insulation resistance of an insulator is suppressed by providing the air purification filter which can maintain the removal performance of acidic gas continuously, and this air purification filter, and a maintenance cycle is lengthened. It is possible to provide a switchgear that can be performed.

2 is a schematic cross-sectional view showing a configuration of a switchgear main body including the air purification filter according to Embodiment 1. FIG. It is a fragmentary sectional view for demonstrating the filter material of the air purification filter which concerns on Embodiment 1. FIG. (A)-(c) shows each process of an acidic gas removal mechanism. FIG. 6 is a schematic cross-sectional view illustrating a configuration of a switchgear body including a cylindrical air purification filter according to a second embodiment. It is a figure which shows the cylindrical air purification filter which concerns on Embodiment 2. FIG. (A) is a perspective view, (b) is a sectional view. It is a cross-sectional schematic diagram which shows the structure of the switchgear main body provided with the air purification filter and antifouling board which concern on Embodiment 3.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

[Embodiment 1]
(Switch gear)
FIG. 1 is a schematic cross-sectional view illustrating a configuration of a main part of a switch gear provided with an air purification filter according to the first embodiment. Referring to FIG. 1, the switchgear of this embodiment includes a bus-side conductor 43, load-side conductors 21 and 22 connected to a power transmission cable to a load, and bus-side conductor 43 and load-side conductors 21 and 22. A switch gear body 1 is provided in which a main circuit switch (breaker) 4 that contacts and separates is housed in a housing.

  The switchgear main body 1 according to this embodiment includes a high-pressure bus room 2 and a high-pressure machine room 3 separated by a partition wall 16. That is, the high-pressure bus room 2 is provided so as to be openable and closable on the bottom wall 11, the top (ceiling wall) 12, the partition wall 16, the side wall 13 a, and the front side of the switchgear body 1 (high-pressure bus room 2 side). The front door 14 is surrounded. The high-pressure machine room is provided to be openable and closable on the bottom wall 11, the top (ceiling wall) 12, the partition wall 16, the side wall 13 b, and the back side of the switch gear body 1 (the high-pressure machine room 3 side). The back door 15 is surrounded. The switchgear main body 1 includes a housing formed of such a wall. In addition to these walls, the partition walls drawn with solid lines in the figure do not form a sealed space, but have a role of structural reinforcement or the like. In addition, a control device for supervisory control is accommodated in a low-pressure control chamber (not shown).

  The high-voltage bus chamber 2 is insulated from the high-pressure machine chamber 3 and the low-pressure control chamber (not shown), and the bus-side conductor 43 (high-voltage bus) is accommodated in the high-voltage bus chamber 2. The high-pressure machine room 3 is insulated from the high-pressure bus room 2 and the low-pressure control room (not shown). In the high-pressure machine room 3, two circuit breakers 4 (for example, vacuum circuit breakers) serve as main circuit switches. Contained.

  The inside of the high-pressure bus chamber 2 communicates with the outside through an air purification filter 51 provided at the intake port 2a. Further, the inside of the high-pressure machine room 3 and the inside of the high-pressure bus room 2 are communicated via an air purification filter 52. Thus, in the switchgear of the present embodiment, the air purification filter is installed at least in the air intake port provided in the casing constituting the switchgear main body. The details of the air purification filter will be described later.

  Part of the air 6 taken into the high-pressure bus room 2 from the outside through the air purification filter 51 flows upward through the high-pressure bus room 2 and is discharged to the outside through the bus duct 2 b, and the other part passes through the air purification filter 52. After that, it flows upward in the high-pressure machine room 3 and is discharged from the exhaust port 3a provided in the ceiling wall 12 of the high-pressure machine room 3 (see the arrow in FIG. 1). Due to the flow of the air 6, heat generated in the high-pressure bus chamber 2 and the high-pressure machine chamber 3 is released to the outside.

  The switchgear according to the present invention is not limited to the configuration of the present embodiment described with reference to FIG. 1, and further includes, for example, main circuit components such as a disconnector and other conductors, A switch and a measuring device may be provided.

  Referring to FIG. 1, an insulator is used for the circuit breaker (main circuit switch) 4 and the high-pressure bus room 2 of the high-pressure machine room 3. In the circuit breaker 4, each of the three circuit breakers (vacuum valves, etc.) provided in the depth direction in the figure corresponding to the three AC phases is housed in the three mold frames (insulation frames) 42. It is supported by. The mold frame 42 is formed of an insulator. The insulator used for the mold frame 42 is not particularly limited as long as it is an insulator material that deteriorates over time, and examples thereof include polyester insulators and phenol insulators. The mold frame 42 is installed on the carriage 41a, and the circuit breaker 4 can be moved by the operation mechanism 41b.

  Further, in the high pressure bus bar chamber 2, an insulator is used as a material for the insulator 44a and the bus bar support plate 43a. The insulator in this case is not particularly limited as long as it is an insulating material that deteriorates over time, and examples thereof include epoxy resins and phenol resins. In addition, the code | symbol 44b shown in FIG. 1 is a current transformer, and the code | symbol 44c is a housing bushing.

  The air 6 flows into the switchgear main body 1 through the air purification filter 51. The air 6 contains acid gas, dust, moisture, and the like. As described above, one of the deterioration factors of the insulator is in the air. It is an acid gas. By removing acid gas with an air purification filter installed in the switchgear, the rate of deterioration of the insulator can be reduced.

(Air purification filter)
The air purification filter used in the present embodiment includes a water-absorbing polymer and at least one carbonate selected from alkali metal carbonates and alkaline earth metal carbonates. The air purification filter allows only very fine dust particles or gaseous substances (for example, air, steam) to pass through.

  Although it does not specifically limit as a shape of the air purification filter of this embodiment, For example, a honeycomb shape is mentioned. Here, the honeycomb shape means a shape in which a plurality of cylinders having a square shape, a sinusoidal waveform, a roll shape, and the like are arranged adjacent to each other in addition to a hexagonal cross section.

  For example, in order to produce a honeycomb-shaped air purification filter having a sinusoidal cross section, first, the filter sheet is passed through a shaping roll and shaped into a waveform (sinusoidal waveform). Join a flat sheet on one or both sides. This is laminated to form a sinusoidal honeycomb filter. Here, it is common to attach and fix an adhesive on the top of the corrugation, but when corrugated filter sheets are stacked, the flat sheet between them is inevitably fixed, so it is not necessary to attach an adhesive. There is no. In addition, when attaching an adhesive agent, it is necessary to use what is not harmful to the switch gas component containing the acidic gas adsorption ability of an filter material and an insulator.

  Fig.2 (a) is a fragmentary sectional view which shows the structure of the filter material 5 which comprises the surface of an air purification filter. The filter material 5 includes at least a water-absorbing polymer 5b and at least one carbonate selected from alkali metal carbonates and alkaline earth metal carbonates.

  The alkali metal carbonate is not particularly limited as long as it is an alkali metal carbonate, and examples of the alkali metal compound include sodium, potassium, and lithium. The alkaline earth metal carbonate is not particularly limited as long as it is a carbonate of an alkaline earth metal. Examples of the alkaline earth metal include calcium, magnesium, and barium. In the present embodiment, one or more carbonates selected from these alkali metal carbonates and alkaline earth metal carbonates can be used.

  As a method of coating the surface of the air purification filter with a filter material, for example, a liquid or paste-like composition containing the carbonate and the water-absorbing polymer is applied to the surface of the air purification filter and dried. The method of coat | covering the surface of an air purifying filter is mentioned.

  Water-absorbing polymer is acrylate polymer, cross-linked acrylate polymer, saponified vinyl acetate-acrylic acid ester copolymer, acrylate-acrylamide copolymer, acrylic acid-vinyl alcohol copolymer , Vinyl alcohol-acrylate polymer, starch-acrylate copolymer, polyvinyl alcohol-maleic anhydride reaction product, cross-linked isobutylene-maleic acid copolymer, polyethylene oxide modified product, and starch- It is at least one polymer selected from the group consisting of acrylonitrile graft copolymers. Examples of the acrylate polymer include polyacrylates such as sodium polyacrylate. The absorptive polymer includes those in which various modifications (including cross-linking) are made to the polymer within a range not impairing the effects of the present invention. Moreover, the polymer of 1 type, or 2 or more types selected from these water absorbing polymers can be used.

  The water-absorbing polymer preferably has a water-absorbing ability of 10 times or more of its own weight, and among the water-absorbing polymers, a water-absorbing polymer used for a paper diaper can be suitably used. By using such a water-absorbing polymer, the retention effect of the acid gas removal performance of the air purification filter is significantly improved.

  The water-absorbing polymer 5b is not particularly limited as long as it is a material that can absorb and retain water without being dissolved in water when it comes into contact with moisture, but is preferably a breathable water-absorbing polymer. A breathable water-absorbing polymer is a polymer with voids through which air can pass. By using a breathable water-absorbing polymer, the contact area with the acid gas in the air increases, and the acid gas removal performance is improved. To do.

  Next, an example of a mechanism for removing acidic gas in the air will be described. As described above, the air 6 flows into the switchgear main body 1 through the air purification filter 51 installed in the intake port 2a of the switchgear main body 1 and the like. Acid gas such as NOx that is one of the factors is included.

  Referring to FIGS. 2A to 2C, NOx reacts with moisture in the air to become nitric acid, and when nitric acid reacts with calcium carbonate 5a in filter material 5, calcium nitrate 5c has very high deliquescence. Is generated (FIG. 2B). Since calcium nitrate 5c has high deliquescence, it absorbs water in the air to form an aqueous solution. Here, the water-absorbing polymer 5b absorbs the aqueous solution in which the calcium nitrate 5c is dissolved, and the generated calcium nitrate is removed from the surface of the calcium carbonate 5a, thereby reducing the effective surface area of the calcium carbonate 5a in contact with the air, The acid gas removal performance of the air purification filter can be maintained (FIG. 2 (c)). As a result, it is possible to remove the cause of a decrease in resistance of the insulator used for the switchgear for a long period of time and to prevent the progress of deterioration.

  Note that clean air from which acid gas in the air has been removed by the air purification filter is sequentially supplied to each chamber in the switchgear main body 1 and the mold frame 41 of the circuit breaker 4 housed in the switchgear main body 1 The high-pressure machine, each conductor, and the like are cooled without causing deterioration of the insulator used in the high-voltage bus bar chamber 2.

  Further, by using the above water-absorbing polymer, only a liquid can be taken into the water-absorbing polymer without removing moisture in the air. When the water-absorbing polymer absorbs moisture in the atmosphere, the amount of aqueous solution such as calcium nitrate generated by the reaction is reduced, and as a result, acid gas removal efficiency is reduced, so the water-absorbing polymer absorbs moisture in the air. The characteristic of not performing improves the acid gas removal efficiency of the air purification filter. Moreover, since the taken-in liquid can be held without leaking outside the water-absorbing polymer, the performance of the air purification filter can be efficiently maintained.

[Embodiment 2]
FIG. 3 is a schematic cross-sectional view illustrating a configuration of a switchgear body including the cylindrical air purification filter according to the second embodiment. In the present embodiment, a cylindrical air purification filter 53 in which a filter material 5 containing a water-absorbing polymer and the above carbonate is fixed to the inner wall of a cylindrical body 53a as shown in FIG. 4 is used as the air purification filter. The points are different from the first embodiment, but the other points are the same as the first embodiment. The size of the air purification filter 53 is not particularly limited, and for example, the outer diameter is 10 cm, the inner diameter is 8 cm, and the length is 50 cm. When air passes through the inside of the cylindrical air purification filter 53, the air contacts the filter material 5, and the acid gas can be removed by the reaction described in the first embodiment.

  According to such a configuration, the pressure loss can be reduced as compared with an air purification filter made of a honeycomb structure or the like, so that the inflow of air into the switch gear from other than the air purification filter installation portion can be reduced. The air flowing into the can be further purified.

[Embodiment 3]
In the present embodiment, as shown in FIG. 5, an antifouling plate 7 having a plate-shaped material containing at least one carbonate selected from a water-absorbing polymer, an alkali metal carbonate, and an alkaline earth metal carbonate, Although it differs from the first embodiment in that it is installed in the traveling direction of the air that has passed through the air purification filter, the other points are the same as in the first embodiment. When the air 6 contacts the antifouling plate 7, the acid gas can be removed by the reaction described in the first embodiment.

  Thus, by installing both the air purification filters 51 and 52 and the antifouling plate 7, the air flowing into the switchgear can be further purified without increasing the pressure loss.

  It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Switchgear main body, 11 Bottom wall, 12 Ceiling wall, 13a, 13b Side wall, 14 Front door, 15 Back door, 2 High pressure bus room, 2a Inlet, 21, 22 Load side conductor, 3 High pressure machine room, 4 Main circuit Switch (circuit breaker), 41a bogie, 41b operation mechanism, 42 mold frame, 43 bus side conductor, 43a bus support plate, 44a insulator, 44b current transformer, 44c housing bushing, 5 filter material, 5a carbonate (carbonic acid) Calcium), 5b Water-absorbing polymer, 5c Calcium nitrate, 51, 52, 53 Air purification filter, 53a Tubular body, 6 Air, 7 Antifouling plate.

Claims (4)

Acrylate polymer, crosslinked acrylate polymer, saponified vinyl acetate-acrylic acid ester copolymer, acrylate-acrylamide copolymer, acrylic acid-vinyl alcohol copolymer, vinyl alcohol-acrylic Acid salt polymer, starch-acrylate copolymer, polyvinyl alcohol-maleic anhydride reactant, cross-linked isobutylene-maleic acid copolymer, modified polyethylene oxide, and starch-acrylonitrile graft copolymer At least one water-absorbing polymer selected from the group consisting of coalescence;
At least one carbonate selected from alkali metal carbonates and alkaline earth metal carbonates;
Including air purification filter.   The air purification filter according to claim 1, wherein an inner wall of a cylindrical body is covered with a filter material containing the water-absorbing polymer and the carbonate. A switchgear body in which a main circuit switch that contacts and separates the busbar side conductor, the loadside conductor, and the busbar side conductor and the load side conductor is housed in a housing;
Control equipment for monitoring and control,
A switchgear, wherein the air purification filter according to claim 1 or 2 is installed at an air intake port provided in the housing. Furthermore, an antifouling plate containing the water-absorbing polymer and the carbonate is provided,
The switchgear according to claim 3, wherein the antifouling plate is installed in a traveling direction of air that has passed through the air purification filter.

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