CN113690004A - Integrated support type series gap lightning arrester and manufacturing method thereof - Google Patents
Integrated support type series gap lightning arrester and manufacturing method thereof Download PDFInfo
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- 229920000647 polyepoxide Polymers 0.000 claims description 7
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 6
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/14—Means structurally associated with spark gap for protecting it against overload or for disconnecting it in case of failure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/06—Mounting arrangements for a plurality of overvoltage arresters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
Abstract
The invention relates to the technical field of power fittings and discloses an integrated support type series gap lightning arrester and a manufacturing method thereof, wherein the integrated support type series gap lightning arrester comprises an upper end hardware fitting, a resistance card, an epoxy cylinder body, a lower end hardware fitting, a projecting electrode and an insulating outer sleeve, the resistor group, the electrode block and the insulating rod are stacked in the epoxy cylinder body, the upper end hardware fitting and the lower end hardware fitting are respectively well pressed with the epoxy cylinder body, the integrated support type series gap lightning arrester and the manufacturing method thereof have the advantages that the service life of the lightning arrester is prolonged, the installation cost and the operation and maintenance cost are reduced, the beautification degree of an overhead line is improved, the production cost is low, and the quality is stable.
Description
Technical Field
The invention relates to the technical field of power accessories, in particular to an integrated support type series gap lightning arrester and a manufacturing method thereof.
Background
With the continuous improvement of the economic quality of China, the investment construction of 10kV power distribution network overhead lines is increased by power grid departments, the lightning protection means of the power distribution network overhead lines is rapidly developed, wherein line lightning arresters are installed on line towers, the lightning protection level of the lines is improved by utilizing the good overvoltage limiting capacity of the zinc oxide lightning arresters, and the experience of success is achieved in China. 10kV distribution network overhead line's shaft tower pattern is various, and the insulator on the shaft tower is different, and more line arrester installation needs to be installed according to pole type and insulator type matching hardware fitting, but too much kind of line arrester and matching hardware fitting easily make installer obscure, lead to the installation mistake to form the hidden danger. At present, the line arrester mainly has three major defects, firstly, hardware with various shapes and colors is needed to be configured for matching with insulators of different types, and the types of materials are various; secondly, the lightning arrester is provided with a longer lead, and the lead is often processed improperly by installation personnel, so that the electrical safety distance is insufficient, and flashover accidents are caused; thirdly, the common lightning arrester is installed in parallel with the insulator, which not only causes the line to be unattractive, but also may cause short-circuit accidents caused by nesting of birds with the hardware bracket. In order to solve the problems, a scheme of manufacturing the insulating support and the fixed external series gap lightning arrester into a whole is a better solution, but a perfect scheme is not provided at present. Similar methods exist in China, for example, a method is proposed in a patent of CN1585046 composite coat insulator lightning arrester and manufacturing method thereof, 2004 of Ningbo Yongyao electric power company, the method is basically not suitable for a power distribution network, and a more perfect scheme aiming at a 10kV overhead line is needed.
CN1585046 composite coat insulator arrester and its manufacturing method invention patent discloses a composite coat arrester insulator manufacturing method, its shortcoming is: 1. the realization method is difficult, the structure and the manufacturing process are too complex, the quality is difficult to control, and the method can only be applied to suspension insulators with higher voltage levels and is difficult to popularize on linear rods with the largest use amount of 10kV overhead lines. 2. The zinc oxide body and the high-voltage line have no isolation gap in the structure, so that the service life of the lightning arrester is greatly reduced under the condition that the zinc oxide body is electrified for a long time. 3. The zinc oxide body does not have isolation clearance with high-voltage line in the structure, because the arrester failure mode is the short circuit, short circuit tripping operation can be caused to the arrester failure so, influences the circuit power supply. 4. The zinc oxide body is zinc oxide annular resistance card in the structure, and zinc oxide annular resistance card is because of the preparation technology is complicated, and the key technology of inner ring glazing and internal insulation packing is still immature, thereby forms inhomogeneous electric field easily and takes place inboard flashover at the ring piece for the arrester damages, and manufacturing cost is high simultaneously.
Disclosure of Invention
The first object of the present invention is: the utility model provides an integration support formula series gap arrester, extension arrester life reduces installation cost and fortune dimension cost, improves overhead line's beautification degree, low in production cost and stable in quality.
The second object of the present invention is: the manufacturing method of the integrated support type series gap lightning arrester is provided, the service life of the lightning arrester is prolonged, the production cost is low, the quality is stable, the process is simplified, and the quality controllability is strong.
In order to achieve the purpose, the invention provides an integrated support type series gap lightning arrester which comprises an epoxy cylinder, wherein two ends of the epoxy cylinder are respectively connected with an upper end hardware fitting and a lower end hardware fitting to form a rod body, an insulating outer sleeve is wrapped on the outer side of the rod body, the epoxy cylinder is provided with an accommodating cavity which is open upwards, a core body is installed in the accommodating cavity, a sealing protective layer is arranged between the core body and the epoxy cylinder, the core body comprises an insulating rod, an electrode block and a resistor group which are sequentially stacked from top to bottom, the electrode block is electrically connected with an extended electrode, one end of the extended electrode is located in the electrode block, the other end of the extended electrode is exposed out of the insulating outer sleeve, and a discharge gap is formed between the extended electrode and the upper end face of the upper end hardware fitting.
Preferably, the resistor sheet group is formed by laminating two or more resistor sheets, and the resistor sheets are columnar resistor sheets.
Preferably, the outer wall of the insulating rod is in threaded connection with the inner wall of the epoxy cylinder.
As a preferred scheme, the upper end of the upper end fitting and the lower end of the lower end fitting are respectively exposed out of the insulating outer sleeve, the lower end of the upper end fitting is provided with an upper core mounting cavity, the upper end of the lower end fitting is provided with a lower core mounting cavity, two ends of the core body are respectively mounted in the upper core mounting cavity and the lower core mounting cavity, and the open ends of the upper core mounting cavity and the lower core mounting cavity are respectively located in the insulating outer sleeve.
As a preferred scheme, the epoxy cylinder cover is provided with an epoxy end cover for sealing the accommodating cavity, the epoxy end cover is located between the upper core mounting cavity and the insulating rod, and two ends of the epoxy end cover are respectively abutted to the insulating rod and the upper core mounting cavity.
Preferably, the radial thickness of the epoxy cylinder is set to be 3 mm-5 mm.
As a preferred scheme, the bottom of the epoxy cylinder is provided with a buffer block, the buffer block is located between the resistor sheet group and the lower end hardware fitting, and the buffer block and the epoxy cylinder are integrally formed.
Preferably, the sealing protection layer is a solid sealing protection layer, and the thickness of the solid sealing protection layer is set to be 0.35 mm-0.55 mm.
A manufacturing method of an integrated supporting type series gap arrester comprises the following steps:
s1, forming an epoxy cylinder body with a containing cavity and an epoxy end cover by crosslinking and curing glass fibers and epoxy resin;
s2, fixedly connecting one end of the epoxy cylinder with a lower-end hardware fitting;
s3, sequentially placing the resistor group, the electrode block and the insulating rod into the accommodating cavity, wherein the outer wall of the insulating rod is in threaded connection with the inner wall of the epoxy cylinder body so as to adjust the compression degree between the resistor group and the electrode block, and the epoxy end cover is fixedly sealed at the opening end of the epoxy cylinder body;
s4, fixedly connecting the other end of the epoxy cylinder with an upper end hardware fitting;
s5, after the accommodating cavity is vacuumized, injecting glue into the accommodating cavity to form a sealing protection layer between the core body and the epoxy cylinder body to form a rod body;
s6, vulcanizing the outer surface of the rod body to form an insulating outer sleeve;
and S7, an extended electrode is arranged from the surface of the insulating outer sleeve towards the radial direction of the corresponding position of the electrode block, so that one end of the extended electrode is connected with the electrode block, and the other end of the electrode block is exposed out of the insulating outer sleeve.
Preferably, the insulating outer sleeve is made of silicon rubber, and the insulating outer sleeve is a multi-section umbrella-shaped insulating outer sleeve.
Compared with the prior art, the integrated support type series gap lightning arrester has the beneficial effects that: the core is installed in the cavity that holds of epoxy barrel, and the epoxy barrel plays main supporting role in whole arrester, need not to make further fixed to the core from the middle part, and bearing structure is simple, has the guard action to the core simultaneously. The insulating outer sleeve plays a role in protecting and insulating the rod body, and a sealing protective layer is formed between the core body and the epoxy cylinder body. Install the core in holding the cavity, the core with be formed with sealing protection layer between the epoxy barrel, sealing protection layer is used for isolated outside air's aqueous vapor to get into, prevents the water ageing of arrester, prolongs the life of arrester and improves the stability in use of arrester. The electrode block is installed and is stretched out the electrode, and the insulating rod is located between upper end gold utensil and the electrode block to form the discharge gap between the up end that makes stretch out electrode and upper end gold utensil, the resistance piece group is located between electrode block and the lower extreme gold utensil, and then avoids the resistance piece to be in long-term electrified state, prevents the electrical ageing of resistance piece group, effectively improves the life of arrester. Meanwhile, the discharge gap can isolate fault current, so that the power transmission of a power grid cannot be influenced when the resistor block group fails. The integrated support type series gap lightning arrester can be used as an upward support insulator, is applied to a linear rod with a small span of a 10kv distribution network, can also be used as a horizontal tension-resistant insulator, is applied to a tension-resistant rod with a high voltage grade and a large span, and has a wide application range. The resistor sheet group can be formed by stacking annular or block-shaped resistor sheets, the selection types of the resistor sheets are wide, and the manufacturing cost is reduced. The lightning arrester has excellent protection performance of a 10kV fixed external series gap zinc oxide lightning arrester, also has the function of insulating support, has enough mechanical strength and sealing performance, is suitable for being installed and used in coastal areas with strong typhoons or high-thunder and multi-thunder high mountain areas, has simple integral appearance structure, improves the beautification degree of overhead lines of a distribution network, and improves the integral service life of the lightning arrester in the aspects of electrical aging and water vapor aging respectively.
Compared with the prior art, the manufacturing method of the integrated support type series gap arrester has the following beneficial effects that: follow the open end of epoxy barrel is put into resistance piece group, electrode piece and insulating rod in proper order hold the cavity, put into between each part and hold the cavity, the equipment method is simple, improve the production efficiency of arrester, pour into epoxy into with liquid form and hold the cavity in, reduce the injection operation degree of difficulty, guarantee simultaneously that the clearance between core and the epoxy barrel is filled completely, the shape that the sealed protective layer formed after filling the solidification is strong to the shape adaptability between core and the epoxy barrel, the leakproofness is good, sealed controllability is strong, punch the electrode piece of packing into with the direct tapping of conductive screw, form the blind hole in the electrode piece, the leakproofness is strong, the whole method flow is simplified, high quality, low in production cost.
Drawings
Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.
FIG. 2 is a schematic structural diagram of a stick according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of a core body according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an upper end hardware fitting according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a lower end fitting according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of an epoxy cartridge according to an embodiment of the present invention.
In the figure:
10. an insulating outer sleeve;
20. an epoxy cylinder; 21. an accommodating cavity; 22. sealing the protective layer; 23. an epoxy end cap; 24. an air exhaust hole; 25. injecting glue holes;
30. a core body; 31. an insulating rod; 32. an electrode block; 33. a resistor group; 34. resistance cards; 35. extending the electrode; 36. a buffer block;
40. an upper end fitting; 41. an upper core mounting cavity;
50. a lower end fitting; 51. and a lower core installation cavity.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. used herein are used to indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the terms "connected," "fixed," and the like are used in a broad sense, and for example, the terms "connected," "connected," and "fixed" may be fixed, detachable, or integrated; the connection can be mechanical connection or welding connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1 to 6, an integrated supporting type series gap lightning arrester according to a preferred embodiment of the present invention includes an epoxy cylinder 20, two ends of the epoxy cylinder 20 are respectively connected to an upper end fitting 40 and a lower end fitting 50 to form a rod, an insulating outer sleeve 10 is wrapped around the outer side of the rod, the epoxy cylinder 20 is provided with an accommodating cavity 21 which is open upward, a core 30 is installed in the accommodating cavity 21, a sealing protection layer 22 is disposed between the core 30 and the epoxy cylinder 20, the core 30 includes an insulating rod 31, an electrode block 32 and a resistor group 33 which are sequentially stacked from top to bottom, the electrode block 32 is electrically connected to an extended electrode 35, one end of the extended electrode 35 is located in the electrode block 32, the other end of the extended electrode is exposed out of the insulating outer sleeve 10, and a discharge gap is formed between the extended electrode 35 and an upper end surface of the upper end fitting 40.
In the integrated support type series gap lightning arrester, the core body 30 is arranged in the accommodating cavity 21 of the epoxy cylinder body 20, the epoxy cylinder body 20 plays a main supporting role in the whole lightning arrester, the core body 30 does not need to be further fixed from the middle part, the support structure is simple, and the core body 30 is protected. The insulating sheath 10 protects and insulates the rod, and a sealing protective layer 22 is formed between the core 30 and the epoxy cylinder 20. Install core 30 in holding cavity 21, be formed with sealing protection layer 22 between core 30 and the epoxy barrel 20, sealing protection layer 22 is used for isolated outside air's aqueous vapor to get into, prevents the water ageing of arrester, prolongs the life of arrester and improves the stability in use of arrester. The electrode block 32 is provided with the extending electrode 35, the insulating rod 31 is located between the upper end hardware fitting 40 and the electrode block 32, so that a discharge gap is formed between the extending electrode 35 and the upper end face of the upper end hardware fitting 40, and the resistor sheet group 33 is located between the electrode block 32 and the lower end hardware fitting 50, so that the resistor sheet 34 is prevented from being in a long-term electrified state, the resistor sheet group 33 is prevented from electrical aging, and the service life of the lightning arrester is effectively prolonged. Meanwhile, the discharge gap can isolate fault current, so that the power transmission of a power grid cannot be influenced when the resistor block group fails. The integrated support type series gap lightning arrester can be used as an upward support insulator, is applied to a linear rod with a small span of a 10kv distribution network, can also be used as a horizontal tension-resistant insulator, is applied to a tension-resistant rod with a high voltage grade and a large span, and has a wide application range. The resistor sheet group 33 in the present invention can be formed by stacking ring-shaped or block-shaped resistor sheets 34, and the selection type of the resistor sheets 34 is wide, which contributes to the reduction of the manufacturing cost. The lightning arrester has excellent protection performance of a 10kV fixed external series gap zinc oxide lightning arrester, also has the function of insulating support, has enough mechanical strength and sealing performance, is suitable for being installed and used in coastal areas with strong typhoons or high-thunder and multi-thunder high mountain areas, has simple integral appearance structure, improves the beautification degree of overhead lines of a distribution network, and improves the integral service life of the lightning arrester in the aspects of electrical aging and water vapor aging respectively.
Further, as shown in fig. 1 to 3, the resistive sheet group 33 is formed by stacking two or more resistive sheets 34, and the resistive sheets 34 are columnar resistive sheets 34. The resistance card 34 is a zinc oxide resistance card 34, the annular resistance card 34 is only produced by a small number of manufacturers at present, the manufacturing cost of the annular resistance card 34 is high, the manufacturing process is complex, and the quality is unstable. The cylindrical resistance cards 34 are produced by a plurality of manufacturers, the manufacturing process is simple, under the requirement of the same circulation capacity, the consumption of the annular resistance cards 34 is twice that of the cylindrical resistance cards 34, the production cost of the cylindrical resistance cards 34 used for the resistance cards 34 is lower than that of the annular resistance cards 34 used for the resistance cards 34, and the quality is more stable.
Further, as shown in fig. 1 to 3, the outer wall of the insulating rod 31 is screwed with the inner wall of the epoxy cylinder 20. The degree of compression of the electrode block 32 and the resistor group 33 is controlled through a spring at present, the outer side of the insulating rod 31 is in threaded connection with the epoxy cylinder 20, a discharge gap is formed by the insulating rod 31, the degree of compression of the electrode block 32 and the resistor group 33 is also controlled, the use of spring parts is reduced, the production cost is reduced, and meanwhile, the production steps are simplified. After the spring part is used for a long time, the spring is easy to deform, the elastic action is weakened, the compression effect is reduced, the compression degree of the electrode block 32 and the resistor group 33 is controlled through the threaded connection between the outer side of the insulating rod 31 and the epoxy cylinder 20, the compression effect is good, and the retention time of the compression effect is long.
Further, as shown in fig. 1, the upper end of the upper end fitting 40 and the lower end of the lower end fitting 50 are respectively exposed out of the insulating outer sleeve 10 and are used for being connected as a terminal, an upper core installation cavity 41 is formed in the lower end of the upper end fitting 40, a lower core installation cavity 51 is formed in the upper end of the lower end fitting 50, two ends of the core 30 are respectively installed in the upper core installation cavity 41 and the lower core installation cavity 51, the core 30 is fixed through the upper core installation cavity 41 and the lower core installation cavity 51 to form a rod body, the supporting structure is further strengthened on the basis of the epoxy cylinder body 20, the open ends of the upper core installation cavity 41 and the lower core installation cavity 51 are respectively located in the insulating outer sleeve 10, the sealing performance between the upper end fitting 40 and the lower end fitting 50 and the epoxy cylinder body 20 is strengthened, moisture aging is prevented, and the supporting strength of the rod body is improved.
The epoxy cylinder 20 plays a role in insulation support, the epoxy cylinder 20 is arranged in the upper core mounting cavity 41 and the lower core mounting cavity 51, the integrity of the rod is enhanced, the support performance of the rod is further improved, one ends of the upper end hardware fitting 40 and the lower end hardware fitting 50 are respectively wrapped in the insulation outer sleeve 10, the integrity of the rod is further enhanced, the integral support strength of the lightning arrester is improved, and the insulation outer sleeve 10 plays a role in insulation support. Therefore, the lightning arrester has strong overall insulating support performance and is suitable for being installed and used in coastal areas with strong typhoon or high-thunder and multi-thunder high-mountain areas.
Further, as shown in fig. 1 to 3, the radial thickness of the epoxy cylinder 20 is set to 3mm to 5mm, the radial thickness of the epoxy cylinder 20 is 3mm to 5mm, the support strength is good, and resources are reasonably utilized.
Further, the bottom of the epoxy cylinder 20 is provided with a buffer block 36, the buffer block 36 is located between the resistor group 33 and the lower end fitting 50, and when the wire of the connecting end fitting generates sudden impact tension, the buffer block 36 deforms under pressure, so that impact force is absorbed, and the wire of the connecting end fitting or the lightning arrester is prevented from being broken. The buffer block 36 and the epoxy cylinder 20 are integrally formed, so that the manufacturing process is simple in steps and low in production cost. Preferably, the thickness of the buffer block 36 is set to 6 mm-8 mm, and the buffer effect is good.
Further, as shown in fig. 1 to 3, the sealing protection layer 22 is a solid sealing protection layer 22. The sealing protection layer 22 is used for guaranteeing the sealing performance inside the core body 30 and preventing air and moisture from entering, and after the gas sealing protection layer 22 is used for a long time, gas in the sealing protection layer 22 leaks gas easily, so that the sealing performance inside the core body 30 is invalid, moisture is aged, and the service life of the lightning arrester is shortened. The solid sealing protective layer 22 does not leak gas, has good sealing effect and effectively prolongs the service life of the lightning arrester. Meanwhile, the thickness of the solid sealing layer is set to be 0.35-0.55 mm, and the thickness of the solid sealing layer is thinner, so that the influence on the structure between the core body 30 and the epoxy cylinder body 20 is smaller, and the support strength between the core body 30 and the epoxy cylinder body 20 is favorably improved. The solid sealing protective layer 22 is solid filled, which also facilitates the retention of the support structure between the core 30 and the epoxy cylinder 20.
Further, as shown in fig. 1 to fig. 3, the epoxy cylinder 20 is covered with an epoxy end cap 23 for sealing the accommodating cavity 21, the epoxy end cap 23 is located between the upper core mounting cavity 41 and the insulating rod 31, and two ends of the epoxy end cap 23 respectively abut against the insulating rod 31 and the upper core mounting cavity 41. The epoxy end cover 23 enables the core body 30 to be more stably installed in the epoxy cylinder body 20, prevents components in the core body 30 from falling out of the epoxy cylinder body 20, has stronger installation integrity of the epoxy cylinder body 20 and the core body 30, is convenient to assemble, and improves the assembly efficiency of the lightning arrester. Epoxy end cover 23 is the epoxy material, has certain support intensity and elasticity, helps the absorption of connecting wire to the arrester impact force, further promotes buffering effect with buffer block 36 cooperation, effectively protects arrester and electric wire netting wire, prevents that electric wire netting wire and arrester from being damaged.
A manufacturing method of an integrated supporting type series gap arrester comprises the following steps:
s1, forming an epoxy cylinder body 20 with a containing cavity 21 and an epoxy end cover 23 by crosslinking and curing glass fibers and epoxy resin;
s2, fixedly connecting one end of the epoxy cylinder body 20 with a lower end fitting 50 to enable the contact surface of the lower end fitting 50 and the epoxy cylinder body 20 to be fused and fastened; specifically, one end of the epoxy cylinder 20 is pressed against the lower end fitting 50 by a hydraulic press.
S3, the resistor group 33, the electrode block 32 and the insulating rod 31 are sequentially placed into the containing cavity 21, all the parts are placed into the containing cavity 21, the assembling mode is simple, and the production efficiency of the lightning arrester is improved. The outer wall of the insulating rod 31 is in threaded connection with the inner wall of the epoxy cylinder 20 so as to adjust the compression degree between the resistor group 33 and the electrode block 32, the compression of the resistor group 33 and the electrode block 32 can be directly realized by adjusting the insulating rod 31, the steps of putting springs into the resistor group 33 and the electrode block 32 are reduced, the steps are simplified, and the installation efficiency is improved. The epoxy end cover 23 is fixedly sealed at the opening end of the accommodating cavity 21, specifically, the epoxy end cover 23 is fixedly sealed at the opening end of the epoxy cylinder 20 through glue;
s4, fixedly connecting the other end of the epoxy cylinder 20 with an upper end fitting 40, so that the contact surface of the upper end fitting 40 and the epoxy cylinder 20 is fused and fastened; specifically, the other end of the epoxy cylinder 20 is in compression joint with the upper end hardware fitting 40 through a hydraulic press.
S5, after the accommodating cavity 21 is vacuumized, injecting glue into the accommodating cavity 21 to form a sealing protection layer 22 between the core body 30 and the epoxy cylinder body 20, and then forming a rod body; specifically, the two sides of the epoxy cylinder 20 are respectively provided with an air exhaust hole 24 and a glue injection hole 25, the air exhaust hole 24 and the glue injection hole 25 are communicated with the accommodating cavity 21, the glue injection hole 25 is temporarily sealed, air in the accommodating cavity 21 is exhausted through the air exhaust hole 24, the glue injection hole 25 is opened, the air exhaust hole 24 is temporarily sealed, liquid epoxy resin is injected into the accommodating cavity 21 through the glue injection hole 25, after the epoxy resin is cured, a sealing protection layer 22 is formed between the core 30 and the epoxy cylinder 20 to form a rod, and the air exhaust hole 24 is opened; the epoxy resin is injected into the accommodating cavity 21 in a liquid form, so that the injection operation difficulty is reduced, the gap between the core body 30 and the epoxy cylinder body 20 is completely filled, the shape formed by the sealing protection layer 22 after filling and curing is strong in adaptability to the shape between the core body 30 and the epoxy cylinder body 20, the sealing performance is good, and the sealing controllability is strong.
S6, vulcanizing the outer surface of the rod body to form the insulating outer sleeve 10. Preferably, the vulcanization is injection vulcanization or press vulcanization.
S7, the extended electrode 35 is installed from the surface of the insulating outer sleeve 10 to the radial direction of the corresponding position of the electrode block 32, so that one end of the extended electrode 35 is connected with the electrode block 32, and the other end of the electrode block 32 is exposed out of the insulating outer sleeve 10. Specifically, the extended electrode 35 is directly tapped and punched into the electrode block 32, and a blind hole is formed in the electrode block 32, so that the sealing performance is high.
The integrated support type series gap lightning arrester is structurally mainly characterized in that an epoxy cylinder 20 with enough mechanical strength is used as a support, a resistor group 33 is used as a voltage limiting element, the resistor group 33, a lead-out electrode and an insulating rod 31 form a lamination in the epoxy cylinder 20, and two ends of the epoxy cylinder 20 are connected with hardware fittings. The resistor group 33 is used as a protection element for limiting the overvoltage of the distribution line, the number and the size of the resistor sheets 34 and the sectional area of the resistor sheets 34 can be selected according to the protection requirement, and the diameter of the zinc oxide cake-shaped resistor sheet 34 can be 30-50 mm. The epoxy cylinder 20 is used as a support member, and a modified epoxy resin adhesive curing glass fiber insulating material with acid and alkali resistance, high temperature resistance and high tensile strength is selected, the diameter of the support member is determined by the diameter of the resistance card 34, in order to ensure long-life operation of the integrated support type series gap lightning arrester, the discharge gap distance between the leading-out electrode and the upper end face of the upper end hardware fitting 40 can be selected to be 45-70 mm, and the discharge gap distance is determined by the discharge voltage level of a line insulator.
The hardware includes an upper end hardware 40 and a lower end hardware 50, which are used as mechanical and electrical connection parts with the distribution line, and the epoxy cylinder 20 is compressed, so that the lightning arrester has a sufficient tensile load by using friction between the hardware and the epoxy cylinder 20. One end of the hardware fitting facing the epoxy cylinder body 20 is a cylindrical flange, the inner wall of the cylinder is provided with internal threads so as to be connected with two ends of the epoxy cylinder body 20, and the epoxy cylinder body 20 is used as a protective layer and a supporting piece of the cake-shaped zinc oxide resistor disc 34.
Further, as shown in fig. 1, the insulating outer sheath 10 is made of silicon rubber and has a multi-section umbrella shape. The insulating material on the outer side of the epoxy cylinder body 20 is silicon rubber, and the silicon rubber outer sleeve has high pollution resistance and hydrophobicity besides good insulating property, so that the defect that a porcelain insulator and a glass insulator need to be cleaned frequently is overcome. During manufacturing, a layer of primer is coated on the outer edge of the epoxy glass fiber cylinder to ensure that the silicon rubber and the glass fiber cylinder are tightly combined.
The invention relates to a manufacturing method of an integrated supporting type series gap lightning arrester, which is characterized in that a resistor group 33, an electrode block 32 and an insulating rod 31 are sequentially placed into a containing cavity 21 from the opening end of an epoxy cylinder 20, all the parts are placed into the containing cavity 21, the assembling mode is simple, the production efficiency of the lightning arrester is improved, epoxy resin is injected into the containing cavity 21 in a liquid form, the injection operation difficulty is reduced, the gap between a core body 30 and the epoxy cylinder 20 is completely filled, the shape formed by a sealing and protecting layer 22 after filling and curing is strong in adaptability to the shape between the core body 30 and the epoxy cylinder 20, the sealing performance is good, the sealing controllability is strong, a conductive screw is directly tapped and punched to be filled into the electrode block 32, a blind hole is formed in the electrode block 32, the sealing performance is strong, the flow of the integral method is simplified, the quality controllability is strong, and the production cost is low.
To sum up, the embodiment of the invention provides an integrated support type series gap lightning arrester, which has excellent protection performance of a 10kV fixed external series gap zinc oxide lightning arrester, has the functions of insulating support, enough mechanical strength and sealing performance, is suitable for being installed and used in coastal areas with strong typhoons or high-thunder and multi-thunder high-mountain areas, has a simple integral appearance structure, improves the beautification degree of distribution network overhead lines, and improves the integral service life of the lightning arrester in the aspects of electrical aging and water vapor aging.
The embodiment of the invention provides a manufacturing method of an integrated support type series gap arrester, which has the advantages of simplified overall method flow, strong quality controllability and low production cost.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides an integration supported series gap arrester which characterized in that: including the epoxy barrel, epoxy barrel both ends are connected with upper end gold utensil and lower extreme gold utensil respectively in order to form the barred body, barred body outside parcel has insulating overcoat, the epoxy barrel has been seted up and has been opened up the cavity that holds up, install the core in holding the cavity, the core with be equipped with the sealing protection layer between the epoxy barrel, the core includes from last insulating bar, electrode block and the resistance piece group that down piles up in proper order, the electrode block electricity is connected with stretches out the electrode, the one end that stretches out the electrode is located the electrode block, the other end expose in insulating overcoat, stretch out the electrode with form the discharge gap between the up end of upper end gold utensil.
2. The integrally supported series gap arrestor of claim 1, wherein: the resistor sheet group is formed by laminating more than two resistor sheets, and the resistor sheets are columnar resistor sheets.
3. The integrally supported series gap arrestor of claim 1, wherein: the outer wall of the insulating rod is in threaded connection with the inner wall of the epoxy cylinder.
4. The integrally supported series gap arrestor of claim 1, wherein: the upper end of the upper end fitting and the lower end of the lower end fitting are respectively exposed out of the insulating outer sleeve, an upper core mounting cavity is formed in the lower end of the upper end fitting, a lower core mounting cavity is formed in the upper end of the lower end fitting, two ends of the core body are respectively mounted in the upper core mounting cavity and the lower core mounting cavity, and the open ends of the upper core mounting cavity and the lower core mounting cavity are respectively located in the insulating outer sleeve.
5. The integrally supported series gap arrestor of claim 4, wherein: the epoxy cylinder body cover is provided with an epoxy end cover used for sealing the accommodating cavity, the epoxy end cover is located between the upper core mounting cavity and the insulating rod, and two ends of the epoxy end cover are respectively abutted to the insulating rod and the upper core mounting cavity.
6. The integrally supported series gap arrestor of claim 1, wherein: the radial thickness of the epoxy cylinder is set to be 3 mm-5 mm.
7. The integrally supported series gap arrestor of claim 1, wherein: the bottom of the epoxy cylinder body is provided with a buffer block, the buffer block is located between the resistor sheet group and the lower end hardware fitting, and the buffer block and the epoxy cylinder body are integrally formed.
8. The integrally supported series gap arrestor of claim 1, wherein: the sealing protective layer is a solid sealing protective layer, and the thickness of the solid sealing protective layer is set to be 0.35 mm-0.55 mm.
9. A manufacturing method of an integrated supporting type series gap lightning arrester is characterized by comprising the following steps: the method comprises the following steps:
s1, forming an epoxy cylinder body with a containing cavity and an epoxy end cover by crosslinking and curing glass fibers and epoxy resin;
s2, fixedly connecting one end of the epoxy cylinder with a lower-end hardware fitting;
s3, sequentially placing the resistor group, the electrode block and the insulating rod into the accommodating cavity, wherein the outer wall of the insulating rod is in threaded connection with the inner wall of the epoxy cylinder body so as to adjust the compression degree between the resistor group and the electrode block, and the epoxy end cover is fixedly sealed at the opening end of the accommodating cavity;
s4, fixedly connecting the other end of the epoxy cylinder with an upper end hardware fitting;
s5, after the accommodating cavity is vacuumized, injecting glue into the accommodating cavity to form a sealing protection layer between the core body and the epoxy cylinder body to form a rod body;
s6, vulcanizing the outer surface of the rod body to form an insulating outer sleeve;
and S7, an extended electrode is arranged from the surface of the insulating outer sleeve towards the radial direction of the corresponding position of the electrode block, so that one end of the extended electrode is connected with the electrode block, and the other end of the electrode block is exposed out of the insulating outer sleeve.
10. The method of making an integrally supported series gap arrestor of claim 9, wherein the method comprises: the insulating outer sleeve is made of silicon rubber, and the insulating outer sleeve is a multi-section umbrella-shaped insulating outer sleeve.
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| CN114400508A (en) * | 2021-12-16 | 2022-04-26 | 南阳金牛电气有限公司 | Gap arrester discharge rod and discharge ball integrated electrode and manufacturing process |
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Application publication date: 20211123 |