CN204732237U - For the lightning-protection ice needle type composite insulator of 10kV transmission line - Google Patents

Abstract

For the lightning-protection ice needle type composite insulator of 10kV transmission line, comprise plug, compound inslation sub-component, insulation umbrella cover, upper gold utensil and lower gold utensil, compound inslation sub-component comprises and being sheathed on successively on plug and the lower conductive cushion block be mutually close to, cross-over block, middle conductive cushion block, metal oxide resistance group and upper conductive cushion block, insulation umbrella cover is wrapped in composite insulator component external, insulating barrier is provided with between compound inslation sub-component and insulation umbrella cover, upper gold utensil runs through insulation umbrella cover and is threaded with upper conductive cushion block, lower gold utensil runs through insulation umbrella cover and is threaded with lower conductive cushion block, the two ends of plug connect with upper gold utensil and lower gold utensil respectively, middle conductive cushion block is connected with the upper sparking electrode always worn and extend out to insulation umbrella cover outside, lower gold utensil is connected with lower sparking electrode, air gap is left between upper sparking electrode and lower sparking electrode.It has lightning protection and anti-icing effective, simple installation, long service life, is convenient to advantages such as existing transmission line transformations.

Description

Lightning-proof and ice-proof pin-type composite insulators for 10kV transmission lines

technical field

The utility model relates to the technical field of electrical engineering, in particular to a lightning-proof and ice-proof needle-type composite insulator for 10kV transmission lines.

Background technique

The 10kV distribution network line is the line with the largest number, the longest cumulative length, the widest distribution area, and the most closely related to users in the power grid. Many distribution network lines extend to some remote mountainous areas. These areas have complex geographical terrain and special climate. Thunderstorms in spring and summer and icing in winter make the line prone to lightning tripping and lightning disconnection accidents, or the icing bridge of line insulators leads to increased leakage current, which seriously affects the continuous and safe power supply of the distribution network.

For the lightning protection of the existing 10kV distribution network lines, there is currently a method of installing an arcing device at both ends of the insulator to reduce the lightning strike disconnection accident, but it is still difficult to eliminate the tripping and power failure caused by the multi-phase short circuit after the line is struck by lightning; The method of installing line arresters next to the distribution network line insulators, but this will greatly increase the difficulty of installation and the investment cost of line construction. In addition, the current line surge arresters used in distribution networks have the disadvantage of simple outer insulating umbrella structure. Most of them are sheds with equal umbrella diameters or only small and large umbrella diameters. The anti-icing ability is not strong, and it is easy to bridge when encountering severe ice , making the external insulation level drop.

Utility model content

The technical problem to be solved by the utility model is to overcome the deficiencies of the existing technology, and provide a lightning protection and anti-icing effect, which is easy to install, long in service life, and convenient for the transformation of existing transmission lines for 10kV transmission lines. Lightning and ice-proof pin-type composite insulators.

In order to solve the above technical problems, the utility model adopts the following technical solutions:

A lightning-proof and anti-icing needle-type composite insulator for 10kV transmission lines, including a mandrel, a composite insulator assembly, an insulating sheath, upper fittings and lower fittings, the composite insulator assembly is sequentially sleeved on the mandrel and mutually The lower conductive spacer, the insulating spacer, the middle conductive spacer, the metal oxide resistance sheet group and the upper conductive spacer are closely attached, and the insulating umbrella cover is wrapped outside the composite insulator assembly, and the composite insulator assembly and the insulating umbrella cover There is an insulating layer between them, the upper fittings penetrate through the insulating umbrella cover and are threadedly connected with the upper conductive pad, the lower fittings penetrate the insulating umbrella cover and are threadedly connected with the lower conductive pad, and the two ends of the mandrel are respectively connected with the upper It is connected with the lower fitting, and the middle conductive pad is connected with an upper discharge electrode penetrating and protruding to the outside of the insulating umbrella cover. The lower fitting is connected with the lower discharge electrode, and there is a gap between the upper discharge electrode and the lower discharge electrode. There is an air gap.

For the above-mentioned lightning protection and anti-icing pin type composite insulator, preferably, the insulating shed is provided with three sheds arranged at intervals from top to bottom, and the shed diameters of the three sheds decrease one by one along the direction from top to bottom.

For the lightning protection and anti-icing needle type composite insulator, preferably, the upper discharge electrode includes a screw and an electrode rod, one end of the screw is connected to the middle conductive pad, and the other end extends to the outside of the insulating umbrella cover. The electrode rod is threadedly connected to one end of the screw rod protruding from the outside of the insulating sheath.

For the above-mentioned lightning protection and anti-icing needle type composite insulator, preferably, an insulating sleeve is sheathed on the outside of the electrode rod.

For the above-mentioned lightning protection and anti-icing pin type composite insulator, preferably, one end of the connecting screw rod of the electrode rod is connected to the insulating sheath, and the junction is coated with sealing and insulating glue.

For the above-mentioned lightning protection and anti-icing needle type composite insulator, preferably, the upper fittings and the lower fittings are provided with crimping jacks, and the two ends of the mandrel are respectively crimped to the crimping jacks of the upper fittings and the lower fittings middle.

For the above-mentioned lightning protection and anti-icing pin type composite insulator, preferably, the insulating layer is formed by tightly winding and wrapping an insulating tape on the outside of the composite insulator assembly, and the insulating tape is a glass fiber tape impregnated with epoxy glue.

For the above-mentioned lightning protection and anti-icing pin type composite insulator, preferably, the metal oxide resistor group includes a plurality of metal oxide resistors that are sequentially sleeved on the mandrel and closely attached to each other.

For the above-mentioned lightning protection and anti-icing needle type composite insulator, preferably, the lower conductive pad, the insulating pad, the middle conductive pad, the metal oxide resistance sheet and the upper conductive pad are all disc structures with through holes in the middle .

For the above-mentioned lightning protection and anti-icing needle type composite insulator, preferably, the upper fitting is a slot fitting, the lower fitting is a steel foot fitting; the mandrel is an epoxy glass fiber drawing rod, and the insulating umbrella cover It is a high temperature vulcanized silicone rubber product.

Compared with the prior art, the utility model has the advantages that: the lightning-proof and anti-icing pin-type composite insulator used in the utility model for 10kV transmission lines has good lightning protection and anti-icing performance. Composite insulators play the role of support, fixation and insulation of ordinary pin insulators, and most of the working voltage is borne by insulating pads, the aging process of metal oxide valve plates is significantly weakened, and the service life is greatly extended; and due to the isolation effect of insulating pads, even metal The deterioration of the oxide valve will not affect the normal operation of the line; when the line is struck by lightning and generates overvoltage, the nonlinear resistance characteristics of the metal oxide resistor can clamp the overvoltage and prevent the external insulation of the insulator from flashover, thereby Avoid lightning tripping of the line; metal oxide resistors also limit the size of the lightning current and reduce the current calorific value, thereby avoiding lightning disconnection; under lightning overvoltage, air breakdown occurs between the upper discharge electrode and the lower discharge electrode, eliminating The burning of the insulating material on the surface of the insulator by the discharge arc prolongs the service life of the insulator. The pin-type composite insulator replaces the original common pin-type insulator, which can realize the lightning protection and anti-ice flashing functions of the 10kV line at the same time, and is easy to install without changing the structure of the tower, which is convenient for the transformation of the existing transmission line and can save a lot of equipment. Network line construction investment.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of the lightning protection and anti-icing needle type composite insulator of the utility model for 10kV transmission lines.

illustration:

1. Mandrel; 2. Insulating sheath; 21. Umbrella skirt; 3. Lower conductive pad; 4. Insulating pad; 5. Intermediate conductive pad; 6. Metal oxide resistor group; 61. Metal oxide Resistor sheet; 7. Upper conductive pad; 8. Insulation layer; 9. Upper fitting; 10. Lower fitting; 11. Upper discharge electrode; 111. Screw; 112. Electrode rod; 12. Lower discharge electrode; 13. Insulation sleeve ; 14. Sealing insulating glue; 15. Nut.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

As shown in Figure 1, the lightning protection and anti-icing needle type composite insulator used in the utility model for 10kV transmission line includes a mandrel 1, a composite insulator assembly, an insulating umbrella cover 2, an upper fitting 9 and a lower fitting 10, and the composite insulator assembly includes The lower conductive pad 3, the insulating pad 4, the middle conductive pad 5, the metal oxide resistor group 6 and the upper conductive pad 7, which are set on the mandrel 1 and are close to each other in sequence, and the metal oxide resistor group 6 includes a plurality of metal oxide resistors 61 that are sequentially sleeved on the mandrel 1 and are closely attached to each other. The insulating umbrella cover 2 is wrapped on the outside of the composite insulator assembly. An insulating layer 8 is provided between the composite insulator assembly and the insulating umbrella cover 2. The upper fitting 9 penetrates the insulating umbrella cover 2 and is threadedly connected with the upper conductive pad 7, and the lower fitting 10 penetrates the insulating umbrella. The sleeve 2 is threadedly connected with the lower conductive pad 3, the two ends of the mandrel 1 are respectively connected with the upper fitting 9 and the lower fitting 10, and the middle conductive pad 5 is connected with an upper discharge electrode 11 extending to the outside of the insulating umbrella case 2 A lower discharge electrode 12 is connected to the lower fitting 10, and an air gap is left between the upper discharge electrode 11 and the lower discharge electrode 12.

In this embodiment, the insulating layer 8 is formed by tightly wrapping an insulating tape on the outside of the composite insulator assembly, and the insulating tape is a glass fiber tape dipped in epoxy glue.

In this embodiment, the upper discharge electrode 11 includes a screw 111 and an electrode rod 112. The screw 111 is a steel screw. One end of the screw 111 is connected to the insulating pad 4, and the other end extends to the outside of the middle conductive pad 5. The electrode rod 112 is threadedly connected to one end of the screw rod 111 extending outside the insulating umbrella cover 2 . During manufacture, the screw rod 111 is first installed in the radial hole of the middle conductive spacer 5, and then the upper conductive spacer 7, the metal oxide resistance sheet 61, the middle conductive spacer 5, the insulating spacer 4, and the lower conductive spacer 3 Arranged in sequence along the axial direction and pre-compressed, and then wrapped tightly with insulating tape to form a whole. The lower discharge electrode 12 is pressed and fixed on the lower fitting 10 through the nut 15 .

The outer cover of the above-mentioned electrode rod 112 is provided with an insulating sleeve 13, and one end of the electrode rod 112 connecting the screw rod 111 is connected with the insulating umbrella cover 2 and coated with a sealing insulating glue 14 at the junction, which can prevent moisture from invading the inside of the insulator; the sealing insulating glue 14 The insulating sleeve 13 covering the surface of the electrode rod 112 can extend the creepage distance of the lower half of the pin-type composite insulator to ensure its external insulation level.

In this embodiment, both the upper fittings 9 and the lower fittings 10 are provided with crimping jacks, and the two ends of the mandrel 1 are respectively crimped in the crimping jacks of the upper fittings 9 and the lower fittings 10, since the upper fittings 9 and the lower fittings The fittings 10 are firmly crimped at both ends of the mandrel 1, and can ensure sufficient mechanical load bearing capacity when supporting and fixing the power transmission wire.

In this embodiment, the lower conductive spacer 3 , the insulating spacer 4 , the middle conductive spacer 5 , the metal oxide resistor 61 and the upper conductive spacer 7 are all disc structures with a through hole in the middle. The upper fitting 9 can be a commercially available wire slot fitting, the lower fitting 10 can be a commercially available steel foot fitting; the mandrel 1 is a commercially available epoxy glass fiber lead rod, and the insulating umbrella cover 2 is made of high-temperature vulcanized silicone rubber , High-temperature vulcanized silicone rubber is made of methyl vinyl silicone rubber with compounding agents, and is vulcanized at high temperature in a specially designed mold. The metal oxide resistor 61 can be a commercially available annular zinc oxide resistor, the lower conductive pad 3, the middle conductive pad 5 and the upper conductive pad 7 are custom-made circular aluminum processing parts, and the insulating pads 4 is a ring-shaped epoxy glass fiber processing part, the electrode rod 112 of the upper discharge electrode 11 and the lower discharge electrode 12 are steel processing parts, the insulating sleeve 13 is a high temperature vulcanized silicon rubber part, and the sealing insulating glue 14 is room temperature vulcanized silicon rubber.

In this embodiment, the insulating umbrella cover 2 is provided with three sheds 21 arranged at intervals from top to bottom, and the umbrella diameters of the three sheds 21 decrease one by one along the direction from top to bottom. , because the umbrella diameters of the three sheds 21 of the insulating umbrella cover 2 decrease from top to bottom one by one, the large sheds 21 above play a good shielding effect on the middle and small sheds 21 below, preventing the 21 sheds from The ice-covered bridge can effectively prevent the external insulation level of the insulator from dropping.

When the lightning-proof and anti-icing pin-type composite insulator used for 10kV transmission lines of the utility model is applied to the transmission line, it is installed on the pole tower to support and fix the transmission wire. The function of the type insulator is to support and fix the transmission wire and keep good insulation between the wire and the ground. Most of the working voltage of the line is borne by the insulating spacer 4; Ground, when the direct overvoltage or induced overvoltage caused by the pin-type composite insulator is applied, the overvoltage will cause the air gap between the upper discharge electrode 11 and the lower discharge electrode 12 to break down, and the overvoltage will be applied to the metal oxide resistor. On the sheet 61, the non-linear resistance characteristic of the metal oxide resistor sheet 61 plays a role in clamping the overvoltage, thereby protecting the entire pin-type composite insulator from external insulation flashover, and avoiding line tripping accidents. The pin-type composite insulator has been proved to have good lightning protection and anti-icing effects through trial production and trial use, and can fully meet the design requirements for lightning protection and anti-icing of 10kV transmission lines.

The above descriptions are only preferred implementations of the present utility model, and the protection scope of the present utility model is not limited to the above-mentioned embodiments. For those skilled in the art, the improvement and transformation obtained under the premise of not departing from the technical concept of the utility model should also be regarded as the protection scope of the utility model.

Claims (10)

1. A lightning-proof and ice-proof needle-type composite insulator for 10kV transmission lines, characterized in that it includes a mandrel (1), a composite insulator assembly, an insulating umbrella cover (2), upper fittings (9) and lower fittings ( 10), the composite insulator assembly includes a lower conductive spacer (3), an insulating spacer (4), an intermediate conductive spacer (5), a metal oxide The resistance sheet group (6) and the upper conductive pad (7), the insulating umbrella cover (2) is wrapped outside the composite insulator assembly, and an insulating layer (8) is provided between the composite insulator assembly and the insulating umbrella cover (2) ), the upper fitting (9) penetrates through the insulating umbrella cover (2) and is threadedly connected with the upper conductive pad (7), and the lower fitting (10) penetrates through the insulating umbrella cover (2) and is threaded with the lower conductive pad (3) connection, the two ends of the mandrel (1) are respectively connected with the upper fittings (9) and the lower fittings (10), and the middle conductive pad (5) is connected with a penetrating and protruding to the outside of the insulating umbrella cover (2) The upper discharge electrode (11), the lower metal fitting (10) is connected with the lower discharge electrode (12), and an air gap is left between the upper discharge electrode (11) and the lower discharge electrode (12). 2. The lightning-proof and ice-proof pin-type composite insulator according to claim 1, characterized in that: the insulating shed (2) is provided with three sheds (21) arranged at intervals from top to bottom, along the The umbrella diameters of the three umbrella skirts (21) in the downward direction decrease one by one. 3. The lightning protection and anti-ice needle type composite insulator according to claim 1, characterized in that: the upper discharge electrode (11) includes a screw (111) and an electrode rod (112), and one end of the screw (111) is connected to The middle conductive pad (5) is connected, and the other end extends to the outside of the insulating umbrella cover (2). one end. 4. The lightning protection and anti-icing needle type composite insulator according to claim 3, characterized in that: an insulating sleeve (13) is sheathed on the outside of the electrode rod (112). 5. The lightning-proof and ice-proof needle-type composite insulator according to claim 3, characterized in that: one end of the electrode rod (112) connected to the screw rod (111) is connected to the insulating umbrella cover (2) and coated at the junction There is sealing insulating glue (14). 6. The lightning-proof and ice-proof pin-type composite insulator according to claim 1, characterized in that: both the upper fitting (9) and the lower fitting (10) are provided with crimping jacks, and the mandrel (1) The two ends of the two ends are respectively crimped in the crimping jacks of the upper fitting (9) and the lower fitting (10). 7. The lightning-proof and ice-proof pin-type composite insulator according to any one of claims 1 to 6, characterized in that: the insulating layer (8) is formed by tightly winding and wrapping an insulating tape on the outside of the composite insulator assembly, and the The insulating tape is glass fiber tape impregnated with epoxy glue. 8. The lightning protection and anti-icing needle type composite insulator according to any one of claims 1 to 6, characterized in that: the metal oxide resistor group (6) includes a plurality of core rods (1 ) and metal oxide resistors (61) that are in close contact with each other. 9. The lightning protection and anti-icing needle type composite insulator according to claim 8, characterized in that: the lower conductive pad (3), the insulating pad (4), the middle conductive pad (5), the metal oxide Both the resistor sheet (61) and the upper conductive spacer (7) have a disc structure with a through hole in the middle. 10. The lightning-proof and ice-proof pin-type composite insulator according to any one of claims 1 to 6, characterized in that: the upper fitting (9) is a wire slot fitting, and the lower fitting (10) is a steel foot Metal fittings; the mandrel (1) is an epoxy glass fiber drawing rod, and the insulating umbrella cover (2) is a high-temperature vulcanized silicone rubber product.