CN112786259A - 500kV post porcelain insulator - Google Patents

Abstract

The utility model relates to a 500kV post porcelain insulator, which comprises three porcelain insulator main bodies which are connected in sequence; each porcelain insulator main body comprises an insulating main body part and metal parts arranged at two ends of the insulating main body part, and two adjacent metal parts are butted and connected through a fastener; the insulating main body part comprises a core rod, and the periphery of the core rod is provided with a preset number of umbrella disks; the umbrella disc comprises a plurality of first umbrella discs which are arranged at intervals along the axial direction of the core rod, a second umbrella disc is arranged between the adjacent first umbrella discs, and the outer diameter of the second umbrella disc is smaller than that of the first umbrella discs; the distance between two adjacent first umbrella disks is not less than 60 mm. The utility model provides a 500kV post porcelain insulator has increased the distance between the umbrella, and under the unchangeable condition of post porcelain insulator's product total height, adopt three porcelain insulator main part combination to form, reduced the quantity of metalwork, obtain bigger insulating distance, and then improved electrical properties, the reliability is high, has reduced manufacturing cost simultaneously, convenient assembly.

Description

500kV post porcelain insulator

Technical Field

The utility model relates to an electric power transmission accessory technical field especially relates to a 500kV post porcelain insulator.

Background

Insulators are devices that can withstand the action of voltage and mechanical stress, mounted between conductors of different electrical potentials or between a conductor and a grounded member. Insulators are special insulating controls that can play an important role in overhead transmission lines, such as supporting wires and preventing current from flowing back to ground.

When current 500kV post porcelain insulator uses in high-altitude area, for example the area that the height above sea level is more than 1500 meters, specifically make up the closed assembly in proper order by four porcelain insulator main parts and form, each porcelain insulator main part all includes an insulating main part and two metalworks that set up respectively at insulating main part both ends, that is to say, 500 kV's post porcelain insulator generally includes eight metalworks, and metalwork is more in quantity. Because the metal part easily causes insulation distance loss, the insulator has limited capability of resisting wet flashover or wet impulse voltage level improvement, so that the electrical performance is influenced, meanwhile, the assembly process is complex and tedious, and the production cost is increased.

Disclosure of Invention

To solve the above technical problem or at least partially solve the above technical problem, the present disclosure provides a 500kV post porcelain insulator.

The utility model provides a 500kV post porcelain insulator, which comprises three porcelain insulator main bodies connected in sequence;

each porcelain insulator main body comprises an insulating main body part and metal parts arranged at two ends of the insulating main body part, and two adjacent metal parts are butted and connected through a fastener;

the insulating main body part comprises a core rod, and the periphery of the core rod is provided with a preset number of umbrella disks; the umbrella disc comprises a plurality of first umbrella discs which are arranged at intervals along the axial direction of the core rod, a second umbrella disc is arranged between the adjacent first umbrella discs, and the outer diameter of the second umbrella disc is smaller than that of the first umbrella disc; the distance between two adjacent first umbrella disks is not less than 60 mm.

Optionally, the metal part comprises a mounting disc and a mounting ring arranged on one surface of the mounting disc facing the insulating main body part, and one end of the mounting ring facing the insulating main body part is provided with an opening into which the end of the mandrel can extend; and two adjacent mounting discs are butted and connected through the fastening piece so as to connect the adjacent porcelain insulator main bodies together.

Optionally, a first assembling hole and a second assembling hole are formed in the mounting plate; the adjacent porcelain insulator bodies are connected together through the fasteners penetrating through the first assembling holes on the adjacent mounting discs; the second assembling hole is used for assembling the post porcelain insulator on electrical equipment.

Optionally, a cement colloid is arranged in the mounting ring, and the end of the core rod is fixed in the mounting ring through the cement colloid.

Optionally, a reinforcing rib is arranged on the outer side wall of the mounting ring, and the reinforcing rib is connected with the mounting disc; the reinforcing ribs are arranged in a plurality of intervals along the circumferential direction of the mounting ring.

Alternatively, the diameter of each porcelain insulator body is gradually reduced along the axial direction of the post porcelain insulator, and the diameter of the porcelain insulator body near the ground is the largest.

Optionally, the mandrel and the first and second umbrella disks are integrally formed; the distance between two adjacent first umbrella disks 112 is 60-90 mm.

Optionally, the outer surface of the insulating main body part is provided with an insulating protective layer; the surface of the metal piece is provided with a metal protective layer.

Optionally, the vertical distance from the outer edge of the first umbrella disk to the core rod is 50-90mm, and the vertical distance from the outer edge of the second umbrella disk to the core rod is 35-75 mm.

Optionally, the included angles between the upper surfaces of the first umbrella disk and the second umbrella disk and the radial direction of the mandrel are both 15-20 degrees, and the included angles between the lower surfaces of the first umbrella disk and the second umbrella disk and the radial direction of the mandrel are both 8-13 degrees.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the utility model provides a 500kV post porcelain insulator through setting up the three porcelain insulator main part that connects gradually, and wherein, every porcelain insulator main part all includes an insulating main part and sets up the metalwork at insulating main part both ends, and two adjacent metalworks butt joints just connect through the fastener to make two adjacent porcelain insulator main part combinations closed assembly together. The insulating main body part comprises a core rod, and the periphery of the core rod is provided with a preset number of umbrella disks; the umbrella disc comprises a plurality of first umbrella discs which are arranged at intervals along the axial direction of the core rod, a second umbrella disc is arranged between the adjacent first umbrella discs, and the outer diameter of the second umbrella disc is smaller than that of the first umbrella discs; the distance between the umbrellas between two adjacent first umbrella plates is not less than 60mm, that is to say, constitute the long interval gap between the umbrellas of a plurality of in the 500kV post porcelain insulator that this disclosure provides, the distance between the umbrellas has been increased promptly, under the unchangeable condition of the product total height of post porcelain insulator, adopt three porcelain insulator main part combination to form, namely, the quantity of porcelain insulator main part has been reduced, thereby the quantity of metalwork has been reduced, and replace the shared space of former metalwork by insulating main part, compare with prior art, its internal insulation and the proportion of external insulation space in the product all improve to some extent, consequently, obtain bigger insulating distance, and then improved electric property, high reliability, reduced the cost of production simultaneously, convenient assembly.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is an assembly schematic diagram of a 500kV post porcelain insulator according to an embodiment of the present disclosure;

fig. 2 is a schematic structural view of a porcelain insulator body of a 500kV post porcelain insulator according to an embodiment of the present disclosure;

FIG. 3 is an enlarged view of a portion of a 500kV post porcelain insulator according to an embodiment of the disclosure;

fig. 4 is a schematic layout view of a first assembly hole and a second assembly hole of a 500kV post porcelain insulator according to an embodiment of the present disclosure.

Wherein, 10-porcelain insulator main body; 11-an insulating body portion; 111-a mandrel; 112-a first umbrella disk; 113-a second umbrella disk; 12-a metal part; 121-mounting a disc; 122-a mounting ring; 20-a first assembly hole; 30-a second assembly hole; 40-a fastener; 50-reinforcing ribs.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

It should be noted that the 500kV post porcelain insulator provided by the present disclosure is particularly suitable for high altitude areas. The altitude is the height difference between a certain place and the sea level, and is usually calculated by taking the average sea level as a standard, and is the vertical distance from the ground to the sea level. Generally, the altitude is 1500 or more in a high altitude area.

The post insulator is mainly used for insulating and mechanically fixing buses and electrical equipment of a power plant and a substation. In addition, post insulators are often used as components of electrical equipment such as disconnectors and circuit breakers. The post porcelain insulator is generally assembled and stacked by several porcelain insulator bodies according to the used system voltage. The axial height of each porcelain insulator main body is a structural height H1, and the sum of the structural heights H1 of the porcelain insulator main bodies connected in sequence is the total product height H of the post porcelain insulator; the straight line distance between the surfaces, close to the insulating main body part, of the two metal pieces of each porcelain insulator main body is the insulating distance S of the porcelain insulator main body.

Generally, when the existing 500kV post porcelain insulator is used in a high-altitude area, the total height H of the 500kV post porcelain insulator is 5700-6000mm, the 500kV post porcelain insulator is generally formed by combining four porcelain insulator main bodies, the four porcelain insulator main bodies comprise eight metal pieces, the number of the metal pieces is relatively large, the metal pieces belong to a conductor, the insulation distance S of each porcelain insulator main body can be reduced, the insulation distance of the post porcelain insulator is further reduced, and therefore the electrical performance can be reduced. In addition, the large number of metal parts also increases the production cost and complicates the assembly process.

Based on this, referring to fig. 1 to 4, the present disclosure provides a 500kV post porcelain insulator comprising three porcelain insulator bodies 10 connected in sequence; each porcelain insulator main body 10 comprises an insulating main body part 11 and metal pieces 12 arranged at two ends of the insulating main body part 11, and two adjacent metal pieces 12 are butted and connected through a fastener 40.

Wherein, under the unchangeable condition of the product total height H of using and post porcelain insulator in high altitude area, the 500kV post porcelain insulator that this disclosure provided includes three porcelain insulator main part 10 that link together in proper order, promptly, three insulating main part 11 and six metalworks 12, wherein, a metalwork 12 is fixed respectively at the both ends of every insulating main part 11, thereby two adjacent metalworks 12 butt joints and connect through fastener 40 and make up three insulating main part 11 and fold together. Compared with the prior art, the quantity of the metal parts 12 in the 500kV post porcelain insulator provided by the disclosure is reduced by two, and the space occupied by the original metal parts 12 is replaced by the insulating main body part 11, so that the occupation ratio of the internal insulation space and the external insulation space in the product is improved, a larger insulation distance is obtained, the electrical performance is improved, the reliability is high, the production cost is reduced, and the assembly is simple.

Additionally, the fasteners 40 may be configured in any suitable manner, with the fasteners 40 being exemplary bolts and fastening nuts. To improve the reliability of the connection, the fastener 40 may be made of forged steel or cast steel.

In the present embodiment, the insulating main body 11 includes a core rod 111, and the outer periphery of the core rod 111 has a predetermined number of umbrella disks; the umbrella disc comprises a plurality of first umbrella discs 112 which are arranged at intervals along the axial direction of the core rod 111, a second umbrella disc 113 is arranged between the adjacent first umbrella discs 112, and the outer diameter of the second umbrella disc 113 is smaller than that of the first umbrella discs 112; the inter-umbrella distance L between two adjacent first umbrella disks 112 is not less than 60mm, that is, the inter-umbrella distance L between two adjacent first umbrella disks 112 is greater than or equal to 60mm, and preferably, the inter-umbrella distance L between two adjacent first umbrella disks 112 is 66 mm.

It should be noted that, referring to fig. 3, the inter-umbrella distance L between two adjacent first umbrella disks 112 is the distance of the connecting line between the outermost edges of two adjacent first umbrella disks 112. The first umbrella disks 112 have the same structure and are arranged in parallel, so the inter-umbrella distance L can also be the distance of a connecting line between corresponding positions on the upper surfaces of two adjacent first umbrella disks 112, and of course, the inter-umbrella distance L can also be the distance of a connecting line between corresponding positions on the lower surfaces of two adjacent first umbrella disks 112.

Wherein the umbrella disc is the outer insulating part of the post porcelain insulator and its main function is to protect the core rod 111 from weather and galvanic corrosion and to provide the required creepage distance. According to actual working conditions, the umbrella disk can be made of any suitable material, such as a high-aluminum formula electric porcelain umbrella disk, a silicon rubber umbrella disk and the like.

In addition, the plurality of first umbrella disks 112 may be arranged at equal intervals in the axial direction of the mandrel 111, and of course, may be arranged at unequal intervals. Similarly, the second umbrella disks 113 may be arranged at equal intervals or at unequal intervals along the axial direction of the mandrel 111. It will be understood by those skilled in the art that the second umbrella disk 113 may be disposed at any suitable position between two adjacent first umbrella disks 112, that is, the distance between the second umbrella disk 113 and two adjacent first umbrella disks 112 may be equal or unequal according to specific practical working conditions, and is not limited herein.

In addition, the preset number of umbrella disks on the porcelain insulator main body 10 under the same operating voltage is equal, and during specific use, a plurality of first umbrella disks 112 and a plurality of second umbrella disks 113 of the umbrella disks are arranged in a manner that one first umbrella disk 112 and one second umbrella disk 113 are alternately arranged, wherein the outer diameter of the second umbrella disk 113 is smaller than that of the first umbrella disk 112, and the total number of the first umbrella disks 112 and the second umbrella disks 113 is the preset number. The distance between the two adjacent first umbrella disks 112 is not less than 60mm, that is, compared with the prior art, the distance between the two adjacent first umbrella disks 112 is increased, that is, the 500kV post porcelain insulator provided by the present disclosure constitutes a plurality of long-spaced umbrella gaps, thereby increasing the height of the porcelain insulator main bodies 10 of the preset number, therefore, under the condition that the total height of the post porcelain insulator is not changed, the number of the required porcelain insulator main bodies 10 can be reduced, that is, in the total height of the whole 500kV post porcelain insulator, the number of the metal pieces 12 is reduced, and the space occupied by the original metal pieces 12 is replaced by the insulating main body 11, thereby obtaining a larger insulating distance, and further improving the electrical performance.

In concrete implementation, the structural heights H1 of the porcelain insulator bodies 10 assembled together in a combined and overlapped mode can be equal or unequal, and the total height H of the post porcelain insulator formed by the porcelain insulator bodies 10 can meet the use requirement.

Illustratively, in an area with an altitude of 3500 m, a post porcelain insulator with an operating voltage of 500kV and a total height H of a product to be assembled of 5800mm, the 500kV post porcelain insulator comprises three porcelain insulator bodies 10 connected in sequence, and the three porcelain insulator bodies 10 may have structural heights H1 of 2100mm, 1850mm and 1850mm, respectively. Here, in order to improve stability, one porcelain insulator body 10 having a structural height H1 of 2100 is provided near the bottom surface in assembly.

In the present embodiment, the mandrel 111 has a substantially cylindrical shape, and the mandrel 111 may be made of any suitable material, for example, a high-alumina electrical porcelain mandrel 111, a silicone rubber mandrel 111, an epoxy glass filament winding mandrel 111, or the like, and it is sufficient that the insulating property is satisfied and the umbrella disk can be stably supported and fixed.

The term "substantially" is intended to indicate that the radial cross-section at any location of the mandrel 111 need not be absolutely circular, but that any circular arc surface of the mandrel 111 may be slightly inclined at an angle relative to its central axis, within the allowable range, due to manufacturing tolerances and assembly, in which case the mandrel 111 is also considered cylindrical.

Through above-mentioned technical scheme, the 500kV post porcelain insulator that this disclosure provided, when high-altitude area uses, through setting up three porcelain insulator main part 10 that connects gradually, wherein, every porcelain insulator main part 10 all includes an insulating main part 11 and sets up the metalwork 12 at insulating main part 11 both ends, and two adjacent metalworks 12 dock and connect through fastener 40 to make two adjacent porcelain insulator main parts 10 make up the closed assembly together. The insulating main body part 11 comprises a core rod 111, and the periphery of the core rod 111 is provided with a preset number of umbrella disks; the umbrella disc comprises a plurality of first umbrella discs 112 which are arranged at intervals along the axial direction of the core rod 111, a second umbrella disc 113 is arranged between the adjacent first umbrella discs 112, and the outer diameter of the second umbrella disc 113 is smaller than that of the first umbrella discs 112; the distance between two adjacent umbrellas between the first umbrella disk 112 is not less than 60mm, that is, the 500kV post porcelain insulator provided by the present disclosure constitutes a plurality of long-distance gaps between umbrellas, that is, the distance between umbrellas is increased, under the condition that the total height of the post porcelain insulator is not changed, three porcelain insulator main bodies 10 are adopted to be combined, thereby reducing the number of metal pieces 12, and the space occupied by the original metal pieces 12 is replaced by an insulating main body part 11, compared with the prior art, the occupation ratio of the internal insulation and the external insulation space in the product is improved, therefore, a larger insulation distance is obtained, and further, the electrical performance is improved, the reliability is high, the production cost is reduced, and the assembly is convenient.

Referring to fig. 1 and 2, the metal fitting 12 includes a mounting disc 121 and a mounting ring 122 disposed on a surface of the mounting disc 121 facing the insulating main body 11, and an end of the mounting ring 122 facing the insulating main body 11 has an opening into which an end of the mandrel 111 can extend, that is, the size of the opening matches with the circumferential size of the end of the mandrel 111, so that two ends of the mandrel 111 can respectively extend into the opening and be fixed firmly with the two metal fittings 12, so that the mandrel 111 and the two metal fittings 12 can be assembled into a single porcelain insulator main body 10 conveniently; two adjacent mounting disks 121 are butted and connected by a fastener 40 to connect adjacent porcelain insulator bodies 10 together.

In particular implementations, the mounting plate 121 and the mounting ring 122 may be two separate pieces that are secured together by welding or the like. Of course, the mounting plate 121 and the mounting ring 122 may be integrally formed.

Here, the axial depth of the opening may be smaller than the axial height of the mounting ring 122 along the axial direction of the mounting ring 122, that is, the side of the mounting ring 122 close to the insulating main body portion 11 is an opening side, and the side of the mounting ring 122 far from the insulating main body portion 11 is a plugging side, and at this time, when the mandrel 111 penetrates through the opening, the end of the mandrel 111 abuts against the plugging side of the mounting ring 122. Of course, the axial depth of the opening may be equal to the axial height of the mounting ring 122, that is, both sides of the mounting ring 122 are open, and when the mounting ring 122 is assembled with the mounting disc 121, the mounting disc 121 blocks the side of the mounting ring 122 away from the insulating main body portion 11, so that the end of the mandrel 111 abuts against the mounting disc 121 when the mandrel 111 penetrates through the opening.

In addition, a gasket may be disposed on the side of the opening of the mounting ring 122 away from the insulating main body 11, and the gasket may be made of any suitable material, such as a felt gasket, to improve the connection stability between the metal 12 and the mandrel 111.

Furthermore, the metal piece 12 is interchangeable for ease of assembly. The metal piece 12 provided by the present disclosure does not generate an appreciable corona discharge phenomenon at the operating voltage, thereby avoiding the occurrence of a phenomenon that interferes with the reception of radio or television.

Further, for convenience of assembly, referring to fig. 4, the mounting plate 121 is provided with first and second assembly holes 20 and 30; the adjacent porcelain insulator bodies 10 are connected together by the fastening member 40 penetrating the first fitting hole 20 of the adjacent mounting plate 121, that is, the fastening member 40 penetrates the corresponding first fitting hole 20 of the adjacent two mounting plates 121, thereby combining the adjacent two porcelain insulator bodies 10 together.

As an alternative, in real time, the first assembling holes 20 are threaded holes with threads on the inner wall, the outer wall of the fastening member 40 has external threads matching the internal threads, such as screws, and the corresponding first assembling holes 20 of two adjacent mounting plates 121 are aligned and screwed by the fastening member 40, so that two adjacent porcelain insulator bodies 10 can be combined together.

As another alternative, the first fitting holes 20 are not screw holes, the fastening members 40 have smooth portions and screw portions, such as bolts, corresponding first fitting holes 20 of the adjacent two mounting plates 121 are aligned, and the fastening members 40 penetrate through the two first fitting holes and the screw portions thereof are screw-coupled with lock nuts, so that the adjacent two porcelain insulator bodies 10 can be combined together.

For the connection more stable, during specific use, fastener 40 can be configured with the seal gasket, can avoid stress concentration phenomenon on the one hand, and on the other hand can compensate assembly error to improve the stability of junction.

In particular, the second assembly hole 30 is used to assemble the post porcelain insulator to the electrical device.

Wherein, first pilot hole 20 and second pilot hole 30 are a plurality of respectively, and a plurality of first pilot holes 20 and a plurality of second pilot holes 30 all set up along the circumference interval of mounting disc 121.

Illustratively, referring to fig. 4, the mounting plate 121 is opened with eight first and second fitting holes 20 and 30, and the eight first and second fitting holes 20 and 30 are arranged at intervals in the circumferential direction of the mounting plate 121. The eight first fitting holes 20 are near the outer circumference of the mounting plate 121, and the eight second fitting holes 30 are near the center of the mounting plate 121.

In this embodiment, cement paste is provided in the mounting ring 122, and the end of the mandrel 111 is fixed in the mounting ring 122 by the cement paste.

The cement adhesive is an important component of the electric porcelain product, is a cementing material with certain consistency and fluidity and is formed by mixing and stirring cement, aggregate, water and an additive, fills a reserved gap between the porcelain insulator main body 10 and the metal piece 12 through the cement adhesive, is connected and forms a structural whole with mechanical and electrical properties meeting the use performance, and is convenient to install and good in stability.

In a specific use, a sufficient amount of cement is first disposed in the opening of the mounting ring 122, and then the end of the mandrel 111 is inserted into the opening, and at this time, the cement is filled between the mandrel 111 and the inner wall of the opening, so as to connect the insulating main body 11 and the metal member 12 together.

In addition, the surface of the exposed part of the cement adhesive can be coated with waterproof adhesive, so that the connection reliability of the insulating main body part 11 and the metal piece 12 is improved, and the service life of the porcelain insulator main body 10 is further prolonged.

Referring to fig. 1 and 2, the outer side wall of the mounting ring 122 is provided with a bead 50, and the bead 50 is coupled to the mounting plate 121. The rib 50 is inclined in a direction toward the mounting plate 121 in a direction away from the mounting ring 122, one end of the rib 50 abuts on the side of the mounting ring 122 away from the mounting plate 121, and the other end of the rib 50 abuts on the mounting plate 121.

The reinforcing rib 50 may be an independent reinforcing rib 50 structure, and then fixed to the metal part 12 by welding or the like, and of course, the reinforcing rib 50 may also be integrally formed with the metal part 12.

In addition, the reinforcing ribs 50 are plural, and the plural reinforcing ribs 50 are arranged at intervals along the circumferential direction of the mounting ring 122.

Referring to fig. 1 and 2, in order to improve the assembling stability of the post porcelain insulator, the diameter of each porcelain insulator body 10 is gradually reduced along the axial direction of the post porcelain insulator, and the diameter of the porcelain insulator body 10 near the ground is the largest, that is, from bottom to top, the diameter of each insulator body 11 is gradually reduced, forming a post porcelain insulator structure having a right-tapered axial cross-section, thereby improving the stability of the post porcelain insulator.

During concrete implementation, from the bottom to the top, the diameter of each insulating main body part 11 is also gradually reduced, the structure is simple, the implementation is easy, and the stability is good.

Illustratively, the three porcelain insulator bodies 10 may have a structural height H1 of 2100mm, 1850mm, respectively, when the overall product height H of the 500kV post porcelain insulator is 5800 mm. The porcelain insulator body 10 having a structural height H1 of 2100mm is located at the lowermost position, i.e., the side close to the ground.

The nominal diameter of the core rod 111 of the porcelain insulator main body 10 positioned below is 255-275mm, and the nominal diameter of the first umbrella disk 112 of the porcelain insulator main body 10 positioned below is 370-385 mm.

The nominal diameter of the core rod 111 of the porcelain insulator main body 10 in the middle is 215-.

The nominal diameter of the core rod 111 of the porcelain insulator body 10 located above is 185-.

In this embodiment, the first umbrella disk 112 and the second umbrella disk 113 may be made of any suitable material, such as a high-aluminum formula electroceramic umbrella disk, an electroceramic umbrella disk, or a silicone rubber umbrella disk. In an exemplary embodiment, the high-aluminum formula electric porcelain umbrella disk is formed by baking clay raw materials, calcined bauxite, high-aluminum kaolin and aluminum oxide micro powder. The surfaces of the first umbrella disk 112 and the second umbrella disk 113 are usually covered with enamel to improve the mechanical strength, prevent water infiltration and increase the surface smoothness.

The first disk 112 and the second disk 113 may be fixed to the mandrel 111 by structural adhesive or the like. Preferably, the core rod 111 and the first and second disks 112, 113 are integrally formed.

In addition, adjacent two distance between the umbrellas between first umbrella disk 112 is 60-90mm, promptly, constitutes a plurality of long-distance gap between the umbrellas in the 500kV post porcelain insulator that this disclosure provided, has increased the distance between the umbrellas promptly, under the unchangeable condition of the product total height of post porcelain insulator, adopts three porcelain insulator main parts to make up and forms, promptly, has reduced the quantity of porcelain insulator main part to the quantity of metalwork has been reduced, and the space that will originally occupy the metalwork is replaced by insulating main part.

Further, the outer surface of the insulating main body part 11 is provided with an insulating protective layer, and the insulating protective layer can be arranged in any suitable mode according to actual working conditions, so that the insulating property can be met, and the insulating main body part 11 can be electrically isolated and safely protected.

In a specific implementation, the insulating main body 11 may be an insulator made of electrical ceramics. The electrical ceramic is made by baking quartz, feldspar and clay as raw materials.

As an alternative embodiment, the outer surface of the insulating main body 11 is integrally formed with enamel, i.e. the surface of the porcelain of the insulating main body 11 is usually covered with enamel to improve its mechanical strength, to prevent water infiltration, and to increase surface smoothness.

As another alternative, the outer surface of the insulating main body 11 may be coated with an anti-pollution flashover composite coating, such as silicone rubber, and the thickness of the anti-pollution flashover composite coating is 0.3-0.5mm, which is arbitrarily selected according to the actual working condition and is not limited herein.

The surface of the metal piece 12 has a metal protective layer, such as a zinc coating or a rust-inhibiting paint. In particular, from the aspect of processing technology, the zinc coating is divided into a hot-dip galvanizing protective layer and a cold-dip galvanizing protective layer, and preferably, the zinc coating is a hot-dip galvanizing protective layer.

Referring to FIG. 3, the vertical distance P1 from the outer edge of first disk 112 to core rod 111 is 50-90mm, i.e., the extension of first disk 112 relative to core rod 111 is 50-90 mm; the perpendicular distance P2 from the outer edge of the second disk 113 to the core rod 111 is 35-75mm, i.e., the extension of the second disk 113 with respect to the core rod 111 is 35-75 mm.

Preferably, the extension value P1 of the first disk 112 with respect to the mandrel 111 is 65mm, and the extension value P2 of the second disk 113 with respect to the mandrel 111 is 47.5 mm.

Further, referring to fig. 3, the angles R1 between the upper surfaces of the first disk 112 and the second disk 113 and the radial direction of the mandrel 111 are both 15 ° to 20 °, and the angles R2 between the lower surfaces of the first disk 112 and the second disk 113 and the radial direction of the mandrel 111 are both 8 ° to 13 °.

Preferably, an angle R1 between the upper surfaces of the first disk 112 and the second disk 113 and the radial direction of the mandrel 111 is 17 °, and an angle R2 between the lower surfaces of the first disk 112 and the second disk 113 and the radial direction of the mandrel 111 is 10 °.

In conclusion, the 500kV post porcelain insulator provided by the disclosure forms a plurality of long-distance umbrella-shaped gaps, namely, the umbrella-shaped distance is increased, under the condition that the total height of a post porcelain insulator is not changed, three porcelain insulator main bodies 10 are combined, so that the number of metal pieces 12 is reduced, and the space occupied by the original metal pieces 12 is replaced by the insulation main body part 11. The 500kV post porcelain insulator further has the following characteristics:

1) the standard lightning impulse withstand voltage is not less than 2550kV (peak value);

the lightning impulse withstand voltage of U50 is not less than 1897 kV;

the standard operation impact endurance voltage is not less than 1550kV (peak value);

the U50 operating impact test voltage is not less than 1508 kV;

2) a bending breaking load of not less than 20kN and a torsional breaking load of not less than 10 kN.m;

3) the creepage distance is not less than 17050 mm.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A500 kV post porcelain insulator is characterized by comprising three porcelain insulator main bodies (10) which are connected in sequence;

each porcelain insulator main body (10) comprises an insulating main body part (11) and metal pieces (12) arranged at two ends of the insulating main body part (11), and two adjacent metal pieces (12) are butted and connected through a fastener (40);

the insulating main body part (11) comprises a core rod (111), and the periphery of the core rod (111) is provided with a preset number of umbrella disks; the umbrella disc comprises a plurality of first umbrella discs (112) which are arranged at intervals along the axial direction of the mandrel (111), a second umbrella disc (113) is arranged between the adjacent first umbrella discs (112), and the outer diameter of the second umbrella disc (113) is smaller than that of the first umbrella disc (112); the distance between two adjacent first umbrella disks (112) is not less than 60 mm.

2. The 500kV post porcelain insulator according to claim 1, wherein the metal member (12) comprises a mounting disc (121) and a mounting ring (122) arranged on a face of the mounting disc (121) facing the insulating main body part (11), and one end of the mounting ring (122) facing the insulating main body part (11) is provided with an opening into which an end of the core rod (111) can extend;

two adjacent mounting discs (121) are butted and connected through the fastener (40) to connect the adjacent porcelain insulator bodies (10) together.

3. The 500kV post porcelain insulator according to claim 2, wherein the mounting plate (121) is provided with a first fitting hole (20) and a second fitting hole (30);

the adjacent porcelain insulator bodies (10) are connected together through the fastening piece (40) penetrating through the first assembly hole (20) on the adjacent mounting disc (121);

the second assembling hole (30) is used for assembling the post porcelain insulator on electrical equipment.

4. The 500kV post porcelain insulator according to claim 2, wherein a cement paste is arranged in the mounting ring (122), and the end of the core rod (111) is fixed in the mounting ring (122) through the cement paste.

5. The 500kV post porcelain insulator according to claim 2, wherein a reinforcing rib (50) is arranged on the outer side wall of the mounting ring (122), and the reinforcing rib (50) is connected with the mounting disc (121);

the reinforcing ribs (50) are arranged in a plurality, and the plurality of reinforcing ribs (50) are arranged at intervals along the circumferential direction of the mounting ring (122).

6. The 500kV post porcelain insulator according to any one of claims 1 to 5, wherein each porcelain insulator body (10) has a diameter that gradually decreases in an axial direction of the post porcelain insulator, and the porcelain insulator body (10) near the ground has a largest diameter.

7. The 500kV post porcelain insulator according to any one of claims 1 to 5, wherein the core rod (111) and the first and second umbrella disks (112, 113) are integrally formed;

the distance between two adjacent first umbrella disks (112) is 60-90 mm.

8. The 500kV post porcelain insulator according to any one of claims 1 to 5, wherein an outer surface of the insulating main body part (11) is provided with an insulating protective layer;

the surface of the metal piece (12) is provided with a metal protective layer.

9. The 500kV post porcelain insulator according to any one of claims 1 to 5, wherein a vertical distance from an outer edge of the first umbrella disk (112) to the core rod (111) is 50-90mm, and a vertical distance from an outer edge of the second umbrella disk (113) to the core rod (111) is 35-75 mm.

10. The 500kV post porcelain insulator according to any one of claims 1 to 5, wherein the included angles between the upper surfaces of the first umbrella disk (112) and the second umbrella disk (113) and the radial direction of the core rod (111) are both 15-20 °, and the included angles between the lower surfaces of the first umbrella disk (112) and the second umbrella disk (113) and the radial direction of the core rod (111) are both 8-13 °.

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