CN104952561A - Anti-thunder and anti-icing pin type composite insulator for 10 kV transmission line - Google Patents

Abstract

The invention discloses a lightning-proof and ice-proof needle-type composite insulator for 10kV power transmission line, which comprises a mandrel, a composite insulator assembly, an insulating umbrella cover, wire slot fittings and steel foot fittings, and the composite insulator assembly includes sleeves on the mandrel in turn. The lower conductive spacer, the metal oxide resistance sheet group and the upper conductive spacer are closely attached to each other, and the insulating sheath is wrapped on the outside of the composite insulator assembly. The insulating umbrella cover is threadedly connected with the upper conductive pad, and the steel leg fittings run through the insulating umbrella cover and are threadedly connected with the lower conductive pad. The invention has the advantages of good anti-thunder and anti-icing effects, simple and convenient installation, long service life, convenient modification of existing power transmission lines and the like.

Description

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

technical field

The invention relates to the technical field of electrical engineering, in particular to a lightning-proof and ice-proof pin-type composite insulator for a 10kV transmission line.

Background technique

The medium and low-voltage distribution network lines are the lines with the largest number, the longest cumulative length, and the most closely related to users in the power grid. Many distribution network lines extend to some mountainous areas with complex terrain and high cold climate. In these areas with special geographical environment, when encountering severe weather, the lines are prone to lightning tripping and lightning disconnection accidents, or large-area insulators are covered with ice and bridging. The leakage current increases, seriously affecting the continuous and safe power supply of the distribution network.

For the lightning protection of the existing distribution network lines, there is currently a method of installing arc striking devices at both ends of the insulator to reduce the accidents of lightning strikes and disconnection, but it is still difficult to eliminate the tripping and power failure caused by multi-phase short circuits after lightning strikes the lines; The method of paralleling the line surge arrester next to the network line insulator, but this will greatly increase the installation difficulty and construction cost. In addition, the existing line lightning arresters for distribution networks have the disadvantage of simple outer insulating umbrella structure. Most of the umbrella skirts have equal umbrella diameters or only small and large umbrella diameters. Insulation levels drop.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the existing technology, and provide a lightning protection system for 10kV transmission lines with good lightning protection and anti-icing effects, easy installation, long service life, and convenient modification of existing transmission lines. Ice pin composite insulator.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A lightning-proof and anti-icing pin-type composite insulator for 10kV transmission lines, including a mandrel, a composite insulator assembly, an insulating shed, wire slot fittings, and steel foot fittings. The lower 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 an insulating layer is provided between the composite insulator assembly and the insulating umbrella cover. The wire trough fittings penetrate the insulating umbrella cover and are threadedly connected with the upper conductive pad, the steel foot fittings pass through 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 wire trough fittings and the steel foot fittings .

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 above-mentioned lightning protection and anti-icing needle type composite insulator, preferably, the wire slot fittings and the steel leg fittings are provided with crimping jacks, and the two ends of the mandrel are respectively crimped to the wire slot fittings and the steel leg fittings. into the crimp socket.

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.

For the above-mentioned lightning protection and anti-icing pin type composite insulator, preferably, 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 metal oxide resistor is a zinc oxide resistor.

For the lightning protection and anti-icing needle type composite insulator, preferably, the lower conductive pad, the metal oxide resistor and the upper conductive pad are all disc structures with a through hole in the middle.

For the above-mentioned lightning protection and anti-icing needle type composite insulator, preferably, the mandrel is an epoxy glass fiber drawing rod, and the insulating shed is a high-temperature vulcanized silicone rubber product.

Compared with the prior art, the present invention has the advantages that: the lightning-proof and anti-icing pin-type composite insulator for 10kV transmission line of the present invention has good lightning protection and anti-icing performance, and the pin-type composite insulator can play a normal role when the line is in normal operation. The pin type insulator supports and fixes and has the function of insulation; 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 flashover of the insulator, thereby avoiding the lightning strike of the line Tripping; at the same time, the metal oxide resistor also limits the magnitude of the lightning current and reduces the current heat generation, thereby avoiding disconnection due to lightning strikes. The pin-type composite insulator has the installation method of wire slot fittings and steel foot fittings, which can directly replace the original ordinary pin-type insulators. It has a combination of metal oxide resistors and large, medium and small sheds, which can simultaneously realize the lightning protection of 10kV lines And anti-ice flash function, and easy to install, do not need to change the tower structure like the existing parallel line arrester, it is convenient to transform the existing transmission line, and can save a lot of investment in the construction of distribution network lines.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of a lightning-proof and ice-proof needle-type composite insulator for a 10kV transmission line of the present invention.

illustration:

1. Mandrel; 2. Insulating sheath; 21. Umbrella skirt; 3. Wire slot fittings; 4. Steel foot fittings; 5. Lower conductive pad; 6. Metal oxide resistance sheet group; 61. Metal oxide resistance 7. Upper conductive spacer; 8. Insulation layer; 9. Nut.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the lightning-proof and ice-proof needle-type composite insulator for 10kV transmission lines of the present invention includes a mandrel 1, a composite insulator assembly, an insulating umbrella cover 2, a wire slot fitting 3 and a steel foot fitting 4, and the composite insulator assembly includes sequentially The lower conductive pad 5, the metal oxide resistor group 6 and the upper conductive pad 7, which are sleeved on the mandrel 1 and are closely attached to each other, wherein the metal oxide resistor group 6 includes a plurality of 1 and metal oxide resistors 61 that are close 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 wire groove fitting 3 runs through the insulating umbrella cover 2 and is threadedly connected with the upper conductive pad 7, and the steel foot fitting 4 runs through it. The insulating umbrella cover 2 is threadedly connected with the lower conductive pad 5, and the two ends of the mandrel 1 are respectively connected with the wire groove fitting 3 and the steel foot fitting 4.

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. During production, the upper conductive pad 7, the metal oxide resistance sheet 61, and the lower conductive pad 5 are sequentially arranged and sleeved on the mandrel 1 along the axial direction and pre-compressed, and then tightly wound and wrapped with an insulating tape to form a whole.

In this embodiment, both the wire slot fitting 3 and the steel leg fitting 4 are provided with crimping sockets, and the two ends of the mandrel 1 are respectively crimped into the crimping sockets of the wire slot fitting 3 and the steel leg fitting 4. The groove fittings 3 and the steel foot fittings 4 are firmly crimped at both ends of the mandrel 1, and can ensure sufficient mechanical load carrying capacity when supporting and fixing the transmission wire. The steel foot fitting 4 is threadedly connected with a nut 9 for use when an insulator is installed. The nut 9 is a commercially available stainless steel nut, which is matched with the steel foot fitting 4 .

In this embodiment, the lower 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 wire groove fitting 3 adopts the commercially available wire groove structure type fitting, the steel foot fitting 4 adopts the commercially available steel foot structure type fitting; High-temperature vulcanized silicone rubber parts, 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 resistance sheet 61 can adopt commercially available annular zinc oxide resistance sheet, and the lower conductive spacer 5 and the upper conductive spacer 7 are custom-made annular aluminum processing parts.

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 for 10kV transmission lines of the present invention is applied to the transmission line, it is installed on the pole tower to support and fix the transmission wire. The function is to support and fix the transmission wire and maintain good insulation between the wire and the ground, and bear the normal working voltage of the line; in thunderstorm weather, when the lightning strikes the tower or the wire directly, or the ground near the line is caused by the direct strike overvoltage or When the induced overvoltage is applied to the pin-type composite insulator, the non-linear resistance characteristic of the metal oxide resistor 61 acts to clamp the overvoltage, thereby protecting the entire pin-type composite insulator from flashover of the external insulation. Avoid causing 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 invention, and the scope of protection of the present invention is not limited to the above examples. For those skilled in the art, improvements and transformations obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.

Claims (9)

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), a wire slot fitting (3) and a steel foot fitting ( 4), the composite insulator assembly includes a lower conductive pad (5), a metal oxide resistance sheet group (6) and an upper conductive pad (7), which are sleeved on the mandrel (1) in sequence and closely attached to each other, The insulating umbrella cover (2) is wrapped outside the composite insulator assembly, an insulating layer (8) is provided between the composite insulator assembly and the insulating umbrella cover (2), and the wire slot fitting (3) runs through the insulating umbrella cover ( 2) Threaded connection with the upper conductive pad (7), the steel foot fitting (4) runs through the insulating umbrella cover (2) and screwed with the lower conductive pad (5), the two ends of the mandrel (1) are respectively Connect with wire groove fittings (3) and steel foot fittings (4). 2. The lightning-proof and anti-icing 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-proof and ice-proof pin-type composite insulator according to claim 1, characterized in that: the wire slot fittings (3) and the steel foot fittings (4) are provided with crimping sockets, and the mandrel ( The two ends of 1) are respectively crimped into the crimping sockets of the wire groove fitting (3) and the steel foot fitting (4). 4. The lightning-proof and ice-proof pin-type composite insulator according to claim 1, 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. 5. The lightning-proof and ice-proof pin-type composite insulator according to claim 4, characterized in that: the insulating tape is a glass fiber tape impregnated with epoxy glue. 6. The lightning-proof and ice-proof needle-type composite insulator according to claim 1, characterized in that: the metal oxide resistor group (6) includes a plurality of successively sleeved on the mandrel (1) and are closely attached to each other metal oxide resistors (61). 7. The lightning protection and anti-icing needle type composite insulator according to claim 6, characterized in that: the metal oxide resistor (61) is a zinc oxide resistor. 8. The lightning-proof and ice-proof pin-type composite insulator according to claim 6, characterized in that: the lower conductive pad (5), the metal oxide resistor (61) and the upper conductive pad (7) are all A disc structure with a through hole in the middle. 9. The lightning protection and anti-icing needle type composite insulator according to any one of claims 1 to 8, characterized in that: the mandrel (1) is an epoxy glass fiber drawing rod, and the insulating umbrella sleeve ( 2) It is made of high temperature vulcanized silicone rubber.