CN108250410B - Prefabricated bus for integrated transformer platform and preparation method thereof - Google Patents
Prefabricated bus for integrated transformer platform and preparation method thereof Download PDFInfo
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- CN108250410B CN108250410B CN201810054150.9A CN201810054150A CN108250410B CN 108250410 B CN108250410 B CN 108250410B CN 201810054150 A CN201810054150 A CN 201810054150A CN 108250410 B CN108250410 B CN 108250410B
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/42—Polycarboxylic acids; Anhydrides, halides or low molecular weight esters thereof
- C08G59/4215—Polycarboxylic acids; Anhydrides, halides or low molecular weight esters thereof cycloaliphatic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/52—Dustproof, splashproof, drip-proof, waterproof, or flameproof cases
- H01R13/5202—Sealing means between parts of housing or between housing part and a wall, e.g. sealing rings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/73—Means for mounting coupling parts to apparatus or structures, e.g. to a wall
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R31/00—Coupling parts supported only by co-operation with counterpart
- H01R31/06—Intermediate parts for linking two coupling parts, e.g. adapter
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/20—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for assembling or disassembling contact members with insulating base, case or sleeve
- H01R43/24—Assembling by moulding on contact members
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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Abstract
The invention discloses a prefabricated bus for an integrated transformer platform and a preparation method thereof.A conductive bus is inserted into a casting mold to complete mold filling; mixing the outdoor flame-retardant epoxy resin and the outdoor flame-retardant curing agent according to the proportion of 1:1, injecting the mixture into a die with the die, casting and molding the prefabricated bus, and finishing curing. Wherein, the outdoor flame-retardant epoxy resin is: 30-50 parts of alicyclic epoxy resin, 1-15 parts of aluminum hydroxide, 30-50 parts of silicon micro powder and 4-20 parts of halogen-free flame retardant; the outdoor flame-retardant curing agent comprises: 30-50 parts of methyl hexahydrophthalic anhydride, 1-15 parts of aluminum hydroxide, 30-50 parts of silicon micropowder and 4-15 parts of halogen-free flame retardant. The prefabricated bus prepared by the technical scheme has the advantages of excellent mechanical property and electrical property, good insulation effect, strong load capacity, good flame retardant property, simple and reasonable structure, convenience in installation and low cost.
Description
Technical Field
The invention belongs to the field of transformer equipment, and particularly relates to a prefabricated bus for an integrated transformer platform and a preparation method of the prefabricated bus.
Background
In the existing transformer area in China, the connection of the transformer and the comprehensive distribution box adopts a cable connection mode, and a cable head needs to be manufactured on site during installation, so that time, labor and effort are wasted. Along with the high-speed development of an electric power system, the requirements on timeliness, stability and reliability of power supply are gradually improved, and at present, a transformer area is commonly used for power supply in rural power grids, so that the demand on the transformer area is more and more. National power grid companies now comprehensively implement scientific development and build a resource-saving and environment-friendly society and greatly improve the integrated innovation capability; the comprehensive construction has the advantages of safe reliability, firmness, durability, reasonable structure, advanced technology, economy and high efficiency of the modern power distribution network. Therefore, research and development of a connecting bus which is reasonable in design and simple in structure and can quickly solve the problem of transformer and comprehensive distribution box in the integrated transformer station are imperative.
Patent document No. CN107033318 discloses a prefabricated bus bar for transformer platform based on integration, preparation raw materials, a method and an application thereof, including a copper bar arranged to be connected between a transformer module and a low-voltage distribution module, a wrapping layer arranged on the side surface of the copper bar and used for copper bar insulation protection, and the copper bar is inlaid and insulated and fixedly protected by the wrapping layer. The prefabricated bus is fixed only by being connected with the transformer and the low-voltage distribution box, so that the weight of the prefabricated bus is concentrated on the top of the low-voltage distribution box and the electrical connection part of the prefabricated bus and the transformer, the physical fixation is not firm enough, the electrical connection is not reliable, and potential safety hazards are easily caused; and, prefabricated generating line and low voltage distribution box top joint position do not have sealedly, and rainwater dust gets into low voltage distribution box easily in the outdoor use and leads to potential safety hazard and electrical fault. In addition, the structure has large volume, the electrical performance and the load capacity are still required to be further improved, and the flame retardant property is poor.
Patent document CN107033318 discloses a three-phase four-wire outdoor epoxy resin prefabricated bus for an integrated transformer station, comprising: the bus comprises an upper end bus, a bus connecting part, a fixing nut embedded block, an outdoor epoxy resin pouring layer, an outdoor epoxy resin cover and a lower end bus; the upper end bus and the lower end bus are connected through a bus connecting component, and the lower end bus main body is wrapped by an outdoor epoxy resin pouring layer. The fixing nut embedded blocks are poured on two sides of the outdoor epoxy resin pouring layer. The number of the fixing nut embedded blocks is 4-8, and the fixing nut embedded blocks are symmetrically arranged on two sides of the outdoor epoxy resin pouring layer. The bus connecting member includes: fastening bolt, plain washer, spring shim, nut. The outdoor epoxy resin cover and the outdoor epoxy resin pouring layer are integrally poured, are positioned on the lower portion of the whole body and are matched with the comprehensive distribution box. The outdoor epoxy resin cover is an umbrella-shaped cover body. The prefabricated bus is I-shaped, the upper end and the lower end of the prefabricated bus are large, the upper end of the prefabricated bus is connected with the lower end of the prefabricated bus through a bus connecting component and is located at the upper end of the prefabricated bus in a divergent shape, the lower end of the prefabricated bus is located at the lower end of the prefabricated bus in a divergent shape, and the outdoor epoxy resin cover is located at the lower end of the. In this structure, pre-buried fixation nut abaculus in the prefabricated generating line, in order to guarantee insulating effect and nut abaculus fixed firm, nut abaculus position is bulky, moreover through nut bolt fixed connection, installs more loaded down with trivial details, and the cost is higher.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a prefabricated bus for an integrated transformer platform and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the preparation method of the prefabricated bus for the integrated transformer platform is characterized by comprising the following steps of:
1) raw material treatment:
the outdoor flame-retardant epoxy resin comprises the following components in parts by weight: 30-50 parts of alicyclic epoxy resin, 1-15 parts of aluminum hydroxide, 30-50 parts of silicon micro powder and 4-20 parts of halogen-free flame retardant; adding the components into a reaction tank, stirring and mixing at 50-120 ℃ for 60-120 minutes, then degassing and dehydrating for more than 8 hours under the vacuum condition of 50-1000Pa, and discharging the mixture to obtain the outdoor flame-retardant epoxy resin;
the outdoor flame-retardant curing agent comprises the following components in parts by weight: 30-50 parts of methyl hexahydrophthalic anhydride, 1-15 parts of aluminum hydroxide, 30-50 parts of silicon micropowder and 4-15 parts of halogen-free flame retardant; adding the components into a reaction tank, stirring and mixing at 70-120 ℃ for 60-120 minutes, then degassing and dehydrating for more than 8 hours under the vacuum condition of 50-1000Pa, and discharging a mixture as the outdoor flame-retardant curing agent;
2) inserting the conductive bus into a casting mold to complete mold filling; mixing the outdoor flame-retardant epoxy resin and the outdoor flame-retardant curing agent according to the proportion of 1:1, injecting the mixture into a die with the die, casting and molding the prefabricated bus, and finishing curing.
Preferably, the conductive bus comprises an upper connecting head (1201), an intermediate connecting line (1102), a lower connecting head (1301), a first transverse copper bar (1303) and a second transverse copper bar (1305) which are connected with each other.
Preferably, in the step 2), an epoxy resin automatic pressure gelation process or an epoxy resin vacuum casting process is adopted to cast and mold the prefabricated bus.
Preferably, the epoxy resin automatic pressure gelation process comprises the steps of respectively adding the outdoor flame-retardant epoxy resin formula into a mixing tank with the temperature of 25-40 ℃, mixing for 60-120 minutes by using an anchor type stirring paddle or a spiral lifting umbrella cap type stirring paddle under the vacuum condition of 50-500Pa, stirring at the speed of 40-120 r/min, casting and molding the prefabricated bus in a mold with the mold after the treatment is finished, wherein the mold temperature is 150 ℃ and 190 ℃, and the mold molding and curing time is 20-80 minutes; after the mold is opened, the molded prefabricated bus is placed into an oven or a curing oven for secondary curing, and the secondary curing is carried out for at least 8 hours at the temperature of 125-.
Preferably, the epoxy resin vacuum casting process is that the outdoor flame-retardant epoxy resin formula is respectively added into a final mixing tank of epoxy resin vacuum casting equipment, the temperature of the final mixing tank is 50-70 ℃, and the mixture is mixed for 60-120 minutes by a spiral lifting umbrella-cap type stirring paddle under the vacuum condition of 50-500Pa, and the stirring speed is 40-120 r/min; simultaneously, placing the mold filled with the mold into a casting tank with the temperature of 70-100 ℃, and treating for 20-60 minutes under the vacuum of 50-500 Pa; after the outdoor flame-retardant epoxy resin formula and the treatment of the mold are finished, the final mixing tank and the pouring tank still keep the previous vacuum condition, a pouring valve is opened for pouring, the pouring is finished within 10-40 minutes, the pouring is continuously kept for 5-15 minutes under vacuum, the vacuum can be relieved, and the product is discharged from the furnace; after the mold is opened, the molded prefabricated bus is placed into an oven or a curing oven for secondary curing, and the curing is carried out for at least 8 hours at the temperature of 125-.
Preferably, the casting is suspended for 2 to 5 minutes after the casting for 2 to 5 minutes, and the degassing is then continued.
The prefabricated bus for the integrated transformer station manufactured by the manufacturing method comprises a plurality of conductive buses and an insulating layer wrapping and forming the outside of the conductive buses, the prefabricated bus comprises an upper connector (12), a middle connector (11) and a lower connector (13) which are connected into a whole from top to bottom, the upper connector (12) is provided with a plurality of upper connectors (1201), the lower connector (13) is provided with a plurality of lower connectors (1301), and the corresponding upper connectors (1201) and the corresponding lower connectors (1301) are in conductive connection through the conductive buses.
Preferably, the intermediate connector (11) is provided with a plurality of protrusions (1101) capable of being supported on a steel support of the transformer platform, and the protrusions (1101) are integrally cast with or fixedly mounted on the insulating layer.
Preferably, the boss (1101) has a cylindrical, elliptic cylindrical, semi-cylindrical, rectangular parallelepiped, annular, flange-like or oblique block-like shape.
Preferably, the prefabricated bus comprises four conductive buses, each conductive bus comprises an upper connector (1201), a middle connecting line (1102) and a lower connector (1301) which are connected, the upper connector (1201) and the lower connector (1301) are formed by extending the conductive buses out of an insulating layer, the upper connector (12) is provided with the four upper connectors (1201), the upper connectors are a c-phase upper connector (1201c), a b-phase upper connector (1201b), an a-phase upper connector (1201a) and an o-phase upper connector (1201o) from left to right in sequence, the lower connector (13) is provided with the four lower connectors (1301), and the lower connectors are an a-phase lower connector (1301a), a b-phase lower connector (1301b), a c-phase lower connector (1301c) and an o-phase lower connector (1301o) from left to right in sequence; four intermediate connecting lines (1102) in the intermediate connecting body (11) are transversely arranged at intervals, the intermediate connecting lines (1102) comprise c-phase intermediate connecting lines (1102c), b-phase intermediate connecting lines (1102b), a-phase intermediate connecting lines (1102a) and o-phase intermediate connecting lines (1102o), a first transverse copper bar (1303) and a second transverse copper bar (1305) are arranged in the lower connecting body (13), the c-phase intermediate connecting lines (1102c) are connected with c-phase lower connecting heads (1301c) through the second transverse copper bar (1305), the a-phase intermediate connecting lines (1102a) are connected with a-phase lower connecting heads (1301a) through the first transverse copper bar (1303), and the first transverse copper bar (1303) and the second transverse copper bar (1305) are respectively arranged on the front side and the rear side of the lower connecting heads (1301) and are spaced at intervals.
Preferably, the upper connector 1201 extends in the front-rear direction, and the lower connector 1301 extends in the up-down direction.
Preferably, the conductive bus bar is a copper bar.
Preferably, the width direction of the copper bar of the upper connecting head (1201) is the left-right direction, the width direction of the copper bar of the lower connecting head (1301) is the front-back direction, the width direction of the copper bar of the middle connecting line (1102) is the front-back direction, and the width directions of the copper bars of the first transverse copper bar (1303) and the second transverse copper bar (1305) are the up-down direction. The upper connecting head (1201), the middle connecting line (1102), the lower connecting head (1301), the first transverse copper bar (1303) and the second transverse copper bar (1305) are fixed through fasteners and gaps are filled through welding.
By adopting the technical scheme, the prepared prefabricated bus has the advantages of excellent mechanical property and electrical property, good insulation effect, strong load capacity, good flame retardant property, simple and reasonable structure, convenience in installation and low cost.
Drawings
FIG. 1 is a schematic structural view of a prefabricated bus bar of the present invention;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a bottom view of FIG. 1;
FIG. 4 is a top view of FIG. 1;
FIG. 5 is a sectional view taken along line A-A;
FIG. 6 is a schematic view of the installation of the prefabricated bus bar of the present invention;
FIG. 7 is an enlarged view at I of FIG. 6;
FIG. 8 is a side view of FIG. 6;
FIG. 9 is a schematic wiring diagram (front side) of a prefabricated bus bar of the present invention;
FIG. 10 is a schematic (side) view of the wiring for phase c of the prefabricated bus bar of the present invention;
FIG. 11 is a schematic (side) view of the b-phase wiring of the prefabricated bus bar of the present invention;
FIG. 12 is a schematic (side) view of the a-phase wiring for the prefabricated bus bar of the present invention;
FIG. 13 is a schematic structural view of another embodiment of a prefabricated bus bar of the present invention;
fig. 14 is a schematic structural view of the integrated transformer station of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
For convenience of expression, the directions of front, back, left, right, up and down are defined when the prefabricated bus is installed on the integrated transformer platform.
The prefabricated busbar for the integrated transformer station comprises a plurality of conductive busbars and insulating layers formed outside the conductive busbars in a wrapping mode, the prefabricated busbar comprises an upper connector 12, a middle connector 11 and a lower connector 13 which are connected into a whole from top to bottom, the upper connector 12 is provided with a plurality of upper connectors 1201, the lower connector 13 is provided with a plurality of lower connectors 1301, the corresponding upper connectors 1201 and the corresponding lower connectors 1301 are in conductive connection through the conductive busbars, and the middle connector 11 is provided with a plurality of protruding portions 1101 capable of being supported and positioned on a steel support piece of the transformer station.
The protruding portion 1101 may be fixedly mounted on the intermediate connecting body 11, for example, the protruding portion is fixed on a pin hole or a bolt hole on the intermediate connecting body 11. However, in this embodiment, the protruding portion 1101 is preferably integrally cast with the insulator, so that secondary processing is not required, and the structure is more reliable.
The shape of the projection 1101 may be various, including but not limited to a cylindrical shape, an elliptic cylindrical shape, a semi-cylindrical shape, a rectangular parallelepiped shape, a ring shape, a flange shape, or a skew block shape, as long as the projection 1101 has a contact point, a contact line, or a contact surface that forms an upper and lower bearing with the steel support 4. Preferably, the invention provides two embodiments: one embodiment of the projection 1101 is in the shape of a ramp, as shown in fig. 1 and 2; another embodiment is cylindrical, as shown in fig. 13. If one considers the installation of holes or slots in the steel support 4 to support the pre-fabricated busbar in positioning engagement with the boss 1101, a cylindrical boss is preferred to facilitate the holes/slots.
In order to support the prefabricated busbar firmly and reliably, the protrusions 1101 are generally arranged in pairs, two, four or even more pairs, which are opposite from each other left to right or back to front.
As shown in fig. 6 to 8, an insertion part 1302 for being inserted into the top of the distribution box is disposed at the bottom of the lower connector 13, a plurality of lower connectors 1301 are disposed below the insertion part 1302, a circle of sealing groove 1304 is formed around the insertion part 1302, and a sealing ring 2 is disposed in the sealing groove 1304. The top of the distribution box 3 is provided with an opening for inserting the lower connector 13 of the prefabricated bus, the hole wall of the opening is turned upwards to form a flange 31, and the flange 31 is embedded into the sealing groove of the lower connector 13 of the prefabricated bus and is abutted to the sealing ring 2.
In this embodiment, the prefabricated bus bar is in an i shape with a large upper connector and a large lower connector and a small middle connector, but the prefabricated bus bar of the present invention is not limited to the i shape, and may be in any other shape.
As shown in fig. 5 and 9, the prefabricated busbar includes four conductive busbars, each conductive busbar includes an upper connector 1201, a middle connection line 1102 and a lower connector 1301 connected to each other, the upper connector 1201 and the lower connector 1301 are formed by extending the conductive busbar out of an insulating layer, the upper connector 12 is provided with four upper connectors 1201, the upper connectors 1201c and 1201b of the c phase, the upper connectors 1201a and 1201o of the a phase are sequentially arranged from left to right, the lower connector 13 is provided with four lower connectors 1301, and the lower connectors 1301a and 1301b of the a phase, the lower connectors 1301b of the b phase, the lower connectors 1301c of the c phase and 1301o of the o phase are sequentially arranged from left to right. All the upper connecting heads 1201 extend in the front-rear direction, and all the lower connecting heads 1301 extend in the up-down direction. The conductive bus is a copper bar.
As shown in fig. 5 and 9, four intermediate connection lines 1102 are laterally spaced apart within the intermediate connectors 11, the intermediate connection lines 1102 including c-phase intermediate connection lines 1102c, b-phase intermediate connection lines 1102b, a-phase intermediate connection lines 1102a and o-phase intermediate connection lines 1102o, a first transverse copper bar 1303 and a second transverse copper bar 1305 are arranged in the lower connecting body 13, as shown in fig. 12, the c-phase intermediate connecting line 1102c is connected to the c-phase lower connecting head 1301c through a second transverse copper bar 1305, as shown in fig. 10, the phase a intermediate connection line 1102a is connected to the phase a lower connection head 1301a through the first transverse copper bar 1303, as shown in fig. 11 and 9, the b-phase intermediate connecting line 1102b is directly connected to the b-phase lower connector 1301b, the o-phase intermediate connecting line 1102o is directly connected to the o-phase lower connector 1301o, and the first transverse copper bar 1303 and the second transverse copper bar 1305 are respectively disposed on the front side and the rear side of the lower connector 1301 and spaced apart from each other. The copper bar width direction of the upper connector 1201 is the left-right direction, the copper bar width direction of the lower connector 1301 is the front-back direction, the copper bar width direction of the middle connecting line 1102 is the front-back direction, and the copper bar width directions of the first transverse copper bar 1303 and the second transverse copper bar 1305 are the up-down direction. Like this, four conductive bus are interval arrangement in last connector and the intermediate junction body and do not directly from top to bottom to have the transposition alternately, realize a looks and c looks transposition alternately through horizontal copper bar setting around in the connector down, compare in prior art (CN107033318A), and the volume is smaller and more exquisite, and the structure is more reasonable, and the insulating distance between the copper bar is great insulating effectual.
The upper connecting head 1201, the middle connecting line 1102, the lower connecting head 1301, the first transverse copper bar 1303 and the second transverse copper bar 1305 are fixed through fasteners, and gaps are filled through welding. The joint of two copper bars has the gap through the difficult existence gap of avoiding after the fastener is fixed, fills up the gap through the welding, can avoid resin to get into the gap and influence the load capacity and the electric property of conductive bus.
In this embodiment, as shown in fig. 10 to 12, the first transverse copper bar 1303 and the second transverse copper bar 1305 are arranged in a staggered manner, which not only facilitates installation, but also has better insulation effect.
In the invention, the insulating layer outside the conductive bus is molded by casting outdoor flame-retardant epoxy resin.
A preparation method of a prefabricated bus for an integrated transformer platform comprises the following steps:
1) raw material treatment:
the outdoor flame-retardant epoxy resin comprises the following components in parts by weight: 30-50 parts of alicyclic epoxy resin, 1-15 parts of aluminum hydroxide, 30-50 parts of silicon micro powder and 4-20 parts of halogen-free flame retardant; adding the components into a reaction tank, stirring and mixing at 50-120 ℃ for 60-120 minutes, then degassing and dehydrating for more than 8 hours under the vacuum condition of 50-1000Pa, and discharging the mixture to obtain the outdoor flame-retardant epoxy resin;
the outdoor flame-retardant curing agent comprises the following components in parts by weight: 30-50 parts of methyl hexahydrophthalic anhydride, 1-15 parts of aluminum hydroxide, 30-50 parts of silicon micropowder and 4-15 parts of halogen-free flame retardant; adding the components into a reaction tank, stirring and mixing at 70-120 ℃ for 60-120 minutes, then degassing and dehydrating for more than 8 hours under the vacuum condition of 50-1000Pa, and discharging a mixture as the outdoor flame-retardant curing agent;
2) fixedly connecting and inserting the upper connecting head 1201, the middle connecting line 1102, the lower connecting head 1301, the first transverse copper bar 1303 and the second transverse copper bar 1305 into a casting mold to finish mold filling; mixing the outdoor flame-retardant epoxy resin and the outdoor flame-retardant curing agent according to the proportion of 1:1, injecting the mixture into a die with the die, casting and molding the prefabricated bus, and finishing curing.
The one-step molding (prefabricating) bus can be manufactured by adopting an epoxy resin automatic pressure gelation process (APG process) or an epoxy resin vacuum pouring process.
When an epoxy resin automatic pressure gelation process (APG process) is adopted: respectively adding the outdoor flame-retardant epoxy resin and the outdoor flame-retardant curing agent into a mixing tank at the temperature of 25-40 ℃, mixing for 60-120 minutes by using an anchor type stirring paddle or a spiral lifting umbrella cap type stirring paddle under the vacuum condition of 50-500Pa, wherein the stirring speed is 40-120 r/min, after the treatment is finished, casting and molding the prefabricated bus in a mold which is filled with the mold, the mold temperature is 150-190 ℃, and the mold molding and curing time is 20-80 minutes; after the mold is opened, the molded prefabricated bus is placed into an oven or a curing oven for secondary curing, and the secondary curing is carried out for at least 8 hours at the temperature of 125-.
The unique feature of the Automatic Pressure Gelation (APG) technique of epoxy resin is that the epoxy resin mixture is continuously applied with constant pressure to achieve the purpose of forced supplementary curing shrinkage. This process is carried out in a mold at a very high temperature, so that the epoxy resin composition having a high reactivity is rapidly gelled in a short time. Therefore, the product has no defect on the surface, lower internal stress, compact and good consistency of the condensate, high dimensional precision, excellent electromechanical performance and high product qualification rate. Because the gelation time is generally finished within several minutes to dozens of minutes (different according to the size of the die), the utilization rate of the die can be greatly improved, and the production period is shortened. Because the APG process is carried out in an integrally closed system device, the environmental pollution is small, the energy is saved, and the working hours are saved.
When the epoxy resin vacuum casting process is adopted: and respectively adding the outdoor flame-retardant epoxy resin and the outdoor flame-retardant curing agent into a final mixing tank of epoxy resin vacuum casting equipment, wherein the temperature of the final mixing tank is 50-70 ℃, and the mixture is mixed for 60-120 minutes by using a spiral lifting umbrella-cap type stirring paddle under the vacuum condition of 50-500Pa, and the stirring speed is 40-120 revolutions per minute. Meanwhile, the mold filled with the mold is placed into a casting tank with the temperature of 70-100 ℃, and the mold is treated for 20-60 minutes under the vacuum of 50-500 Pa. When the outdoor flame-retardant epoxy resin formula and the processing time of the mold meet the requirements, the final mixing tank and the pouring tank still keep the previous vacuum condition, a pouring valve is opened, the pouring is slowly performed, the pouring is suspended for 2-5 minutes after the pouring is performed for 2-5 minutes, the degassing is performed, and then the pouring is continued. Finishing pouring within 10-40 minutes, and continuously keeping for 5-15 minutes under vacuum, so that the vacuum is released and the furnace is discharged; and after the mold is opened, placing the molded prefabricated bus into an oven or a curing furnace for secondary curing, and curing at the temperature of 125-140 ℃ for at least 8 hours.
The prefabricated bus for the integrated transformer platform is tested by experiments: the tensile strength is more than or equal to 9MPa, the elongation at break is more than or equal to 300%, the elastic modulus is more than or equal to 3MPa, the Shore A hardness is more than or equal to 50, and the volume resistivity is more than or equal to 1016Omega cm, dielectric loss less than or equal to 0.03, breakdown strength more than or equal to 35kV/mm, and flame retardant grade reaching American flame retardant material standard ANS/U L94V 0.
The following tests were performed on the prefabricated busbar of the present invention, the test procedures and test results were as follows:
1. power frequency withstand voltage test
(1) The test voltage values of the prefabricated bus between phases and to the ground are as follows: 2.5kV/5 s;
(2) in the test process, the phenomena of breakdown, flashover and discharge are avoided.
2. Lightning impulse test
(1) The pre-fabricated bus bar is applied with a surge voltage of 1.2/50 mus 5 times per polarity, with a time interval of at least 1 s. The test pulse voltage is: 6kV (full wave).
(2) In the test process, the phenomena of breakdown, flashover and discharge are avoided.
3. Temperature rise test
(1) The temperature rise tests of the transformer, the prefabricated bus and the comprehensive distribution box are carried out simultaneously.
(2) The temperature rise of conductors at the bus duct, the bus connector and the bus bar inserting position of the prefabricated bus bar is not more than 60K, and the temperature rise of the surface of the insulating material is not more than 10K.
4. Electrical gap and creepage distance test:
electrical clearance: 15 mm; creepage distance: 14 mm.
5. Corrosion resistance test for reliability test:
(1) procedure of the test
① damp heat cycle test
The temperature is 40 +/-3 ℃, the relative humidity is 95 percent, and the test time is 24 h.
② salt spray test
The temperature is 35 ℃ plus or minus 2 ℃, and the test time is 24 h.
(2) Test results
After the test, the water is washed for 5min, water drops are removed by a blower, the test is carried out for 2h under the normal use condition, the test shows that ① has no obvious rust mark and crack, no obvious deformation and crack exist at the junction of different insulating materials of ② and the junction of a conductor and the insulating material, and the power frequency withstand voltage test is qualified after ③ test.
6. Temperature change test for reliability test:
low temperature: -25 ℃ ± 3 ℃, high temperature: test times at 40 ℃ ± 2 ℃, low and high temperatures: 2h, 3 times of test circulation.
After the test, the test is carried out after standing for 2 hours under normal atmospheric conditions, and the test shows that ① has no obvious cracks, damages and corrosion, and the power frequency withstand voltage test is qualified after the test of ②.
An integrated transformer station as shown in fig. 14 comprises a transformer 5 mounted above a steel support and a distribution box 3 mounted below the steel support, wherein the transformer 5 and the distribution box 3 are connected by a prefabricated bus as described above, an upper connector 12 of the prefabricated bus is connected with the transformer 5, a lower connector 13 of the prefabricated bus is connected with the distribution box 3, and the prefabricated bus is supported on the steel support by a convex portion 1101 on an intermediate connector 11. In this embodiment, the steel support includes a first channel steel 41, a second channel steel 42, and a third channel steel 43, the first channel steel 41 is fixedly connected to the utility pole, the second channel steel 42 is fixedly connected to the first channel steel 41 and used for fixing the transformer 5 thereon, and the third channel steel 43 is fixed to the second channel steel 42; preferably, the prefabricated busbar is arranged on two third channel steels 43 in parallel, and the convex portion 1101 of the prefabricated busbar is supported on top of the third channel steels 43. In other installation methods, the third channel steel 43 is provided with a hole or a groove, and the boss 1101 of the prefabricated bus is matched with the hole or the groove on the third channel steel 43 to realize supporting, so that not only can the weight support be realized, but also the position fixing can be realized, and the prefabricated bus is prevented from shaking. The first channel 41, the second channel 42 and the third channel 43 may also be angle steels, i-steels or other shaped supports.
As shown in fig. 6-8, the top of the distribution box 3 is provided with an opening for inserting the lower connector 13 of the prefabricated busbar, the wall of the opening is turned upwards to form a flange 31, and the flange 31 is embedded into the sealing groove of the lower connector 13 of the prefabricated busbar and abuts against the sealing ring 2.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The preparation method of the prefabricated bus for the integrated transformer platform is characterized by comprising the following steps of:
1) raw material treatment:
the outdoor flame-retardant epoxy resin comprises the following components in parts by weight: 30-50 parts of alicyclic epoxy resin, 1-15 parts of aluminum hydroxide, 30-50 parts of silicon micro powder and 4-20 parts of halogen-free flame retardant; adding the components into a reaction tank, stirring and mixing at 50-120 ℃ for 60-120 minutes, then degassing and dehydrating for more than 8 hours under the vacuum condition of 50-1000Pa, and discharging the mixture to obtain the outdoor flame-retardant epoxy resin;
the outdoor flame-retardant curing agent comprises the following components in parts by weight: 30-50 parts of methyl hexahydrophthalic anhydride, 1-15 parts of aluminum hydroxide, 30-50 parts of silicon micropowder and 4-15 parts of halogen-free flame retardant; adding the components into a reaction tank, stirring and mixing at 70-120 ℃ for 60-120 minutes, then degassing and dehydrating for more than 8 hours under the vacuum condition of 50-1000Pa, and discharging a mixture as the outdoor flame-retardant curing agent;
2) inserting the conductive bus into a casting mold to complete mold filling; mixing the outdoor flame-retardant epoxy resin and the outdoor flame-retardant curing agent according to the proportion of 1:1, injecting the mixture into a die with the die, casting and molding the prefabricated bus, and finishing curing;
the prefabricated bus comprises a plurality of conductive buses and an insulating layer which is formed outside the conductive buses in a wrapping mode, and comprises an upper connector (12), a middle connector (11) and a lower connector (13) which are connected into a whole from top to bottom, wherein the upper connector (12) is provided with a plurality of upper connectors (1201), the lower connector (13) is provided with a plurality of lower connectors (1301), the corresponding upper connectors (1201) and the corresponding lower connectors (1301) are in conductive connection through the conductive buses, the middle connector (11) is provided with a plurality of protruding parts (1101) which can be supported and positioned on a steel support piece of a transformer platform, and the protruding parts (1101) are integrally cast with the insulating layer or fixedly installed on the insulating layer;
the bottom of the lower connecting body (13) is provided with an inserting part (1302) used for being inserted to the top of a distribution box, the lower connecting heads (1301) are arranged below the inserting part (1302), a circle of sealing groove (1304) is formed in a concave mode on the periphery of the inserting part (1302), and a sealing ring (2) is arranged in the sealing groove (1304);
the conductive bus comprises an upper connector (1201), a middle connecting line (1102), a first transverse copper bar (1303), a second transverse copper bar (1305) and a lower connector (1301) which are connected, wherein the upper connector (1201) and the lower connector (1301) are formed by extending the conductive bus out of an insulating layer, four upper connectors (1201) are arranged on the upper connector (12), a c-phase upper connector (1201c), a b-phase upper connector (1201b), an a-phase upper connector (1201a) and an o-phase upper connector (1201o) are sequentially arranged from left to right, four lower connectors (1301) are arranged on the lower connector (13), and an a-phase lower connector (1301a), a b-phase lower connector (1301b), a c-phase lower connector (1301c) and an o-phase lower connector (1301o) are sequentially arranged from left to right; the four intermediate connecting lines (1102) in the intermediate connecting body (11) are transversely arranged at intervals, each intermediate connecting line (1102) comprises a c-phase intermediate connecting line (1102c), a b-phase intermediate connecting line (1102b), an a-phase intermediate connecting line (1102a) and an o-phase intermediate connecting line (1102o), a first transverse copper bar (1303) and a second transverse copper bar (1305) are arranged in the lower connecting body (13), the c-phase intermediate connecting line (1102c) is connected with the c-phase lower connecting head (1301c) through the second transverse copper bar (1305), the a-phase intermediate connecting line (1102a) is connected with the a-phase lower connecting head (1301a) through the first transverse copper bar (1303), and the first transverse copper bar (1303) and the second transverse copper bar (1305) are respectively arranged on the front side and the rear side of the lower connecting head (1301) and are spaced at intervals; the copper bar width direction of the upper connecting head (1201) is the left-right direction, the copper bar width direction of the lower connecting head (1301) is the front-back direction, the copper bar width direction of the middle connecting line (1102) is the front-back direction, and the copper bar width directions of the first transverse copper bar (1303) and the second transverse copper bar (1305) are the up-down direction.
2. The method for preparing the prefabricated bus bar for the integrated transformer station as claimed in claim 1, wherein in the step 2), the prefabricated bus bar is cast and molded by an epoxy resin automatic pressure gel process or an epoxy resin vacuum pouring process.
3. The method for preparing the prefabricated bus for the integrated transformer platform as claimed in claim 2, wherein the epoxy resin automatic pressure gelation process comprises the steps of respectively adding the outdoor flame-retardant epoxy resin formula into a mixing tank with the temperature of 25-40 ℃, mixing for 60-120 minutes by using an anchor type stirring paddle or a spiral lifting umbrella cap type stirring paddle under the vacuum condition of 50-500Pa, stirring at the speed of 40-120 r/min, casting and molding the prefabricated bus in a mold after the treatment is finished, wherein the mold temperature is 150-190 ℃, and the mold molding and curing time is 20-80 minutes; after the mold is opened, the molded prefabricated bus is placed into an oven or a curing oven for secondary curing, and the secondary curing is carried out for at least 8 hours at the temperature of 125-.
4. The preparation method of the prefabricated bus for the integrated transformer platform according to claim 2, wherein the epoxy resin vacuum casting process comprises the steps of respectively adding an outdoor flame-retardant epoxy resin formula into a final mixing tank of epoxy resin vacuum casting equipment, wherein the temperature of the final mixing tank is 50-70 ℃, and the mixture is mixed for 60-120 minutes by using a spiral lifting umbrella-cap type stirring paddle under the vacuum condition of 50-500Pa, and the stirring speed is 40-120 r/min; simultaneously, placing the mold filled with the mold into a casting tank with the temperature of 70-100 ℃, and treating for 20-60 minutes under the vacuum of 50-500 Pa; after the outdoor flame-retardant epoxy resin formula and the treatment of the mold are finished, the final mixing tank and the pouring tank still keep the previous vacuum condition, a pouring valve is opened for pouring, the pouring is finished within 10-40 minutes, the pouring is continuously kept for 5-15 minutes under vacuum, the vacuum can be relieved, and the product is discharged from the furnace; after the mold is opened, the molded prefabricated bus is placed into an oven or a curing oven for secondary curing, and the curing is carried out for at least 8 hours at the temperature of 125-.
5. The method for preparing the prefabricated bus bar for the integrated transformer station as claimed in claim 4, wherein the casting is stopped for 2-5 minutes after the casting is performed for 2-5 minutes, and the degassing is performed, and then the casting is continued.
6. Prefabricated busbar for an integrated transformer station, characterized by being manufactured with a manufacturing method according to any one of claims 1 to 5.
7. The prefabricated busbar according to claim 6, wherein said boss (1101) is in the shape of a cylinder, an elliptic cylinder, a half cylinder, a rectangular parallelepiped, a ring, a flange, or a block.
8. The prefabricated busbar for the integrated transformer station as claimed in claim 6, wherein the prefabricated busbar comprises four conductive busbars, and the upper connecting head (1201), the middle connecting line (1102), the lower connecting head (1301), the first transverse copper bar (1303) and the second transverse copper bar (1305) are fixed by fasteners and gaps are filled by welding.
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| CN108281864A (en) * | 2018-01-19 | 2018-07-13 | 台州永创电气有限公司 | Integrated transformer platform and its prefabricated busbar |
| KR20200035665A (en) * | 2018-09-27 | 2020-04-06 | 현대모비스 주식회사 | Block terminal for motor and manufacturing method thereof |
| CN110845601B (en) * | 2019-10-12 | 2021-01-19 | 广东药科大学 | GLP-1 analog peptide modified dimer with different configurations and application of preparation method thereof in treating type II diabetes |
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| CN206697261U (en) * | 2017-04-18 | 2017-12-01 | 誉恒涿鹿电气有限公司 | A kind of three-phase and four-line open air epoxy resin prefabricated bus of integrated transformer platform |
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