CN210467445U - Series connection type recoil arc extinguishing insulator - Google Patents

Abstract

The utility model discloses a tandem type recoil arc extinguishing insulator belongs to power transmission and distribution overhead line lightning protection technical field, including a plurality of insulator and connecting rod, a plurality of insulator concatenates through the connecting rod and constitutes insulator chain, and the insulator chain both ends all are provided with recoil arc extinguishing device, and recoil arc extinguishing device is including leading arc electrode, wire and end position insulator, lead the arc electrode setting on the connecting piece of outside, and be connected to on the end position insulator through the wire. The utility model discloses insulator arc extinguishing time is advanced, runs through flashover insulation cooperation by traditional and arrives local flashover insulation cooperation in advance, and the vast majority of insulation after the local flashover does not puncture, only appears creeping discharge, and the arc extinguishing object is the pouring stream of very weak impact arc this moment, and the fragility is high, the arc extinguishing degree of difficulty is low.

Description

Series connection type recoil arc extinguishing insulator

Technical Field

The utility model relates to a power transmission and distribution overhead line lightning protection technical field especially relates to a tandem type recoil arc extinguishing insulator.

Background

When the clouds aggregate to form a difference between the clouds and earth, a very non-uniform electric field is always induced at the insulator. Research shows that the distribution of the electric field intensity among different pieces of insulators is also very uneven when lightning strike occurs, and the electric field intensity of the insulator pieces at two ends of the insulator string is high, and the electric field intensity of the middle part of the insulator string is low. Because the electric field intensity of the insulators at the first end and the last end is high, the electric field intensity of the middle part of the insulator is low, lightning flashover arcs firstly appear at the two ends of the insulator string, and then the lightning flashover arcs develop from the two ends of the insulator string to the middle part.

The lightning arrester and the parallel gap widely adopted in the power line nowadays mainly intervene when lightning stroke occurs, and the traditional lightning arrester has many defects, such as: difficult maintenance, low lightning protection effect, incapability of protecting superposed lightning stroke and the like. The parallel gap also has a number of disadvantages, such as: (1) the parallel gap installation needs additional hardware fittings, and the installation has certain difficulty; (2) the insulation matching of the parallel gap is designed according to the highest breakdown voltage of the head and tail insulators of the insulator string, and partial discharge firstly occurs at the head end and the tail end, so that the insulation matching ratio of the parallel gap needs to be low, the insulation level of a line can be reduced, and the lightning trip-out rate is increased; (3) the parallel gap electrode is burnt by power frequency follow current electric arc for many times, which can lead to the ablation of the metal electrode and reduce the insulation matching capability of the parallel gap and the insulator.

Aiming at the defects of the lightning arrester and the parallel gap, the serial recoil arc-extinguishing insulator applied to the lightning protection of the power transmission line is provided.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a tandem type recoil arc extinguishing insulator to solve the technical problem who exists among the background art.

The utility model provides a tandem type recoil arc extinguishing insulator, includes a plurality of insulator and connecting rod, and a plurality of insulator concatenates through the connecting rod and constitutes insulator chain, and the insulator chain both ends all are provided with recoil arc extinguishing device, and recoil arc extinguishing device is including leading arc electrode, wire and end position insulator, lead the arc electrode setting on the connecting piece of outside, and be connected to on the end position insulator through the wire.

Further, be provided with a plurality of arc extinguishing passageway in the end position insulator, all be provided with the spout on every arc extinguishing passageway, every arc extinguishing passageway all communicates with the outside through the spout, is connected through the connecting wire between arc extinguishing passageway and the arc extinguishing passageway, and the one end and one of them arc extinguishing passageway of wire are connected.

Further, the arc extinguishing passageway includes that the meets dodges subassembly, striking electrode and recoil pipe, the striking electrode sets up the one end at the recoil pipe, connects the sealed other end that sets up at the recoil pipe of dodging the subassembly.

Further, the wire is connected with the lightning receiving component of one of the arc extinguishing channels, and is set as an arc inlet, and the arc extinguishing channels are not parallel to the arc extinguishing channels, and the spouts of the two adjacent arc extinguishing channels are connected through a connecting wire.

Furthermore, the recoil pipe is made of a high-strength, high-temperature-resistant and high-pressure-resistant non-conductive material, the non-conductive material is made of alloy ceramic, rare earth ceramic, graphene-ceramic composite material, organic ceramic, synthetic silicone rubber, organic insulating material, alloy glass, rare earth glass, graphene glass or organic glass, and the inner diameter of the recoil pipe is increased along with the increase of the voltage grade of the power transmission line.

Furthermore, the diameter of the end insulator is larger than that of the insulator, and the nozzle is arranged at the upper end of the end insulator.

Furthermore, a plurality of arc extinguishing channels are arranged into arc extinguishing channel paths with multi-section Z-shaped sawtooth structures and are embedded in the end insulators.

Furthermore, the arc striking electrode is arranged to be a conductive metal ring, and the outer side wall of the conductive metal ring is tightly attached to the inner wall of the recoil pipe.

Further, the arc guiding electrode is of a metal lantern ring structure and is sleeved on the external metal connecting piece.

The first and last two insulators of insulator chain's local field intensity is high, and easy preferred flashover, so at the great insulator of first and last both ends design two areas of insulator chain, install the arc extinguishing module in first and last two insulators for protect the first and last both ends of insulator chain. At the leading stage of thunder and lightning discharge, to inhomogeneous electric field partial discharge characteristic part, two great insulators of area are designed at the first and last both ends of insulator string, install the arc extinguishing module in first and last two insulators, it is insulating to run through the flashover insulation cooperation of tradition in advance to the partial flashover, the realization is effectively extinguished to the partial discharge electric arc, thereby eliminate to develop into the basic condition of main discharge from partial discharge, greatly reduce the arc extinguishing degree of difficulty, eliminate the thunderbolt flashover and build the arc harm, ensure that the thunderbolt does not trip.

And arc striking electrodes are respectively arranged at the head end and the tail end of the insulator string, are respectively sleeved at the head end and the tail end of the insulator string and are in contact with the metal outer walls at the head end and the tail end of the insulator. The arc striking electrodes are made of metal materials and are respectively connected with the arc extinguishing modules in the insulators at the first end and the second end through leads to extinguish arcs with local flashover, so that flashover penetration is prevented. Function of the arc striking electrode: when lightning flashover arcs occur near the insulator, the arc striking electrodes can pull the nearby arcs into the arc extinguishing modules of the insulator pieces at two ends. The arc extinguishing module is arranged inside the insulator pieces at the two ends and consists of arc extinguishing channel paths with a multi-section Z-shaped sawtooth structure. An arc extinguishing tube is arranged in each arc extinguishing channel path, the arc extinguishing tube can be designed into a recoil structure, and the arc extinguishing tube material is a high-strength insulating material, can be a ceramic tube and the like. The arc tubes in different arc passage paths are connected by arc guiding lines to make the arc change in the appointed arc passage. And the outer surface of the insulator sheet at the head end and the tail end is provided with an electric arc nozzle, and the outer nozzle is communicated with the inner electric arc channel.

Further, the recoil unit is provided as a semi-closed pipe fitting which is hollow inside, open at one end and closed at the other end. The plurality of backflushing units respectively comprise an arc striking module, a backflushing module and a lightning receiving module, wherein an opening of the arc striking module is arranged at one end of the backflushing module, and the lightning receiving module is sealed at the other end of the backflushing module. The arc striking module and the lightning receiving module are both made of conductive materials, the arc striking module is a conductive metal ring, and the outer side wall of the conductive metal ring is tightly attached to the inner wall of the recoil pipe.

The basic principle of the utility model is as follows:

the recoil principle is as follows: the inlet electric arc enters the backflushing arc-extinguishing tube quickly, rushes to the arc-guiding electrode and generates elastic collision, so that the direction of the electric arc is converted by 180 degrees to form outlet electric arc, and the outlet electric arc leaves the backflushing arc-extinguishing tube and is sprayed out from the electric arc nozzle; the outlet electric arc leaves the backflushing arc extinguishing tube under the action of backflushing, energy in the backflushing arc extinguishing tube is weakened, meanwhile, the inlet electric arc is blocked, an electric arc large-scale fracture is formed at the inlet of the backflushing arc extinguishing tube, the continuity of the electric arc is damaged, and the electric arc extinguishing is accelerated; the outlet electric arc after the back-flushing acts on the outer electric arc at the inlet of the back-flushing arc extinguishing pipe to form a cavity effect, so that the cut-off of the outer electric arc is accelerated.

The utility model adopts the above technical scheme, the utility model discloses following technological effect has:

(1) the utility model discloses insulator arc extinguishing time is advanced, runs through flashover insulation cooperation by traditional and arrives local flashover insulation cooperation in advance, and the vast majority of insulation after the local flashover does not puncture, only appears creeping discharge, and the arc extinguishing object is the pouring stream of very weak impact arc this moment, and the fragility is high, the arc extinguishing degree of difficulty is low.

(2) Arc extinction is easier, an arc building channel belongs to a non-through channel, and damping is huge.

(3) The re-ignition is more difficult, the medium recovery is faster once the weak arcing is interrupted, the arc path vulnerability is greater, and the deionization area is larger.

(4) The arc extinguishing module has the advantage of safety, and flashover caused by power frequency overvoltage is also extinguished in the partial discharge stage. The arc extinguishing module can be prevented from being damaged by large energy, the range of the arc extinguishing module for suppressing overvoltage and the durability of the arc extinguishing module are improved, and the requirement of the arc extinguishing capability of pure power frequency overvoltage is completely met.

(5) The arc extinguishing module and the insulator string are integrated, so that the installation is simple and the economical efficiency is high.

Drawings

Fig. 1 is the structural schematic diagram of the insulator of the present invention.

Fig. 2 is the schematic view of the end insulator structure of the present invention.

Fig. 3 is a cross-sectional view of the end insulator of the present invention.

Fig. 4 is a schematic view of the internal back-flushing structure of the end-position insulator of the present invention.

Fig. 5 is a sectional view of the arc extinguishing channel of the present invention.

Fig. 6 is the end position insulator internal connection schematic diagram of the utility model.

Fig. 7 is a schematic diagram of the arc extinguishing channel of the present invention.

Fig. 8 is the induced electric field intensity distribution rule chart of the insulator string of the present invention.

In the figure: 1-a connecting rod; 2-an insulator; 3-leading arc electrode; 4-a wire; 5-end insulator; 6-arc extinguishing channel; 7-a nozzle; 8-connecting lines; 9-a lightning receptor assembly; 10-an arc ignition electrode; 11-back flushing the tube.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and by referring to preferred embodiments. It should be understood, however, that the numerous specific details set forth in the specification are merely set forth to provide a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.

The embodiment of the invention is further explained in accordance with the above-described principle and with reference to fig. 1:

as shown in fig. 8, the first and last insulators of the insulator string, that is, the end insulator 5, as the 1 st and 7 th insulators in fig. 1, have high local field strength and are easy to preferentially flashover, so that two insulators with large areas are designed at the first and last ends of the insulator string, and the first and last insulators are provided with the back-flushing arc-extinguishing devices for protecting the first and last ends of the insulator string. The recoil arc-extinguishing device can be formed by making an end insulator 5 to be internally hollow or by later-stage hole turning and the like. At the leading stage of thunder and lightning discharge, to inhomogeneous electric field partial discharge characteristic part, two great insulators of area (1 st, 7 th) are designed at the first and last both ends of insulator string, install recoil arc extinguishing device in two first and last insulators, it is insulating to run through flashover insulation cooperation to the partial flashover in advance with traditional, the realization is effectively extinguished to the partial discharge electric arc, thereby eliminate the basic condition that develops into main discharge from partial discharge, greatly reduce the arc extinguishing degree of difficulty, eliminate thunderbolt flashover and build the arc harm, ensure that the thunderbolt does not trip.

Firstly, after lightning strike, lightning is transmitted to the arc-conducting electrode 3 through an external metal connecting piece, and the arc is transmitted to the end insulator 5 by the arc-conducting electrode 3 through the lead 4 for recoil arc extinction.

As shown in fig. 1, arc-guiding electrodes 3 are respectively arranged at the head end and the tail end of the insulator string, and the arc-guiding electrodes 3 are respectively sleeved at the head end and the tail end of the insulator string and are in contact with the metal outer wall at the head end and the tail end of the insulator. The arc-guiding electrode 3 is made of metal materials and is respectively connected with the recoil arc-extinguishing devices in the insulators at the first end and the last end through a lead 4. Function of the arc-guiding electrode 3: when lightning flashover arcs occur near the insulator, the arc guide electrode 3 can drag the nearby arcs into the recoil arc extinguishing devices of the insulator pieces at the two ends.

The diameter of the end insulator 5 is larger than the diameter of the other insulator in the middle, and the two ends are covered by the diameters of the two ends, so that the arc extinguishing effect of the two ends can be realized.

As shown in fig. 2-4, the lightning flashover arc sequentially passes through the first and last arc-guiding electrodes 3 and the conducting wire 4 to enter the arc-extinguishing channel 6 in the insulator string, the recoil pipe 11 in the arc-extinguishing channel 6 performs a recoil arc-extinguishing function on the impact arc, and the arc is ejected from the nozzle a. The remaining unexpired arc enters the second section arc extinguishing channel 6 under the action of the connecting wire 8, the arc is also subjected to a recoil arc extinguishing action, and the arc is sprayed out from the nozzle B. The process is then the same until the arc is extinguished.

As shown in fig. 5, the arc extinguishing channel 6 is a semi-closed pipe member having a hollow interior, an open end and a closed end. The arc extinguishing channels 6 respectively comprise a lightning receiving component 9, an arc striking electrode 10 and a recoil pipe 11. The opening of the arc extinguishing channel 6 is arranged at one end of the recoil pipe 11, and the lightning receiving component 9 is arranged at the other end of the recoil pipe 11 in a closed mode. The arc striking electrode 10 and the lightning receiving component 9 are both made of conductive materials, the arc striking module is a conductive metal ring, and the outer side wall of the conductive metal ring is tightly attached to the inner wall of the recoil pipe 11.

As shown in FIG. 7, the outer arc may be defined as having a velocity v0 at the inlet, a pressure p0, a density ρ 0, and a temperature T0. After the outer arc enters the recoil assembly, an inlet arc velocity v1, a pressure p1, a density ρ 1 and a temperature T1 are formed. After passing through the arc striking assembly, the outlet arc speed v2 is p2, the pressure is p2, and the temperature is T2. The outer arc enters the recoil assembly through the inlet to form an inner arc, the inner arc is limited by the recoil assembly wall, the diameter is mechanically compressed by a large scale, and the temperature, the density, the pressure and the speed of the inner arc are all increased. Regardless of the arc energy loss and friction effects, when the inlet arc passes through the lightning strike assembly to achieve a resilient impact moment, v1 is considered to be-v 2, i.e., the inlet arc velocity is equal in magnitude and opposite in direction to the outlet velocity. Considering the energy loss and friction of the arc, after the inlet arc collides with the lightning receiving assembly, it is considered that | v2 | v1 | that the outlet velocity is smaller than the inlet velocity and the direction is opposite. The outlet arc is impeded by the inlet arc, which is smaller in diameter than the inlet arc, so that the outlet arc has a greater density, temperature and pressure than the inlet arc, i.e. ρ 2 > ρ 1, T2 > T1, p2 > p1, which in combination accelerate v2 more than v1, i.e. a2 > a 1. As the outlet arc diameter is increasingly compressed, resulting in an increase in outlet arc density, temperature and pressure, v2 > v1 eventually causes the outlet arc to rush out of the recoil assembly from the inlet. After the electric arc at the outlet rushes out of the recoil component, a cavity effect is formed on the external electric arc, the continuity of the electric arc is damaged, the energy of the electric arc is weakened, and the cutting and extinguishing of the electric arc are accelerated.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above, it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (9)

1. A series connection type recoil arc extinguishing insulator comprises a plurality of insulators (2) and a connecting rod (1), wherein the insulators (2) are connected in series through the connecting rod (1) to form an insulator string, and the series connection type recoil arc extinguishing insulator is characterized in that recoil arc extinguishing devices are arranged at two ends of the insulator string and comprise an arc guide electrode (3), a lead wire (4) and an end insulator (5), wherein the arc guide electrode (3) is arranged on an external connecting piece and is connected to the end insulator (5) through the lead wire (4); a plurality of arc extinguishing channels (6) are arranged in the end insulator (5), and each arc extinguishing channel (6) is provided with a nozzle (7).

2. The tandem recoil arc-extinguishing insulator according to claim 1, wherein: each arc extinguishing channel (6) is communicated with the outside through a nozzle (7), the arc extinguishing channels (6) are connected with the arc extinguishing channels (6) through connecting wires, and one end of each wire (4) is connected with one of the arc extinguishing channels (6).

3. The tandem recoil arc-extinguishing insulator according to claim 2, wherein: arc extinguishing channel (6) including connecing and dodging subassembly (9), striking electrode (10) and recoil pipe (11), striking electrode (10) set up the one end at recoil pipe (11), connect to dodge subassembly (9) and seal the other end that sets up at recoil pipe (11).

4. The tandem recoil arc extinguishing insulator according to claim 3, wherein: wire (4) are connected with connecing of one of them arc extinguishing channel (6) and dodge subassembly (9), set up to the electric arc entry, and arc extinguishing channel (6) nonparallel set up, and spout (7) of two adjacent arc extinguishing channels (6) are connected through connecting wire (8).

5. The tandem recoil arc extinguishing insulator according to claim 3, wherein: the recoil pipe (11) is made of a high-strength, high-temperature-resistant and high-pressure-resistant non-conductive material, the non-conductive material is made of alloy ceramic, rare earth ceramic, graphene-ceramic composite material, organic ceramic, synthetic silicone rubber, organic insulating material, alloy glass, rare earth glass, graphene glass or organic glass, and the inner diameter of the recoil pipe (11) is increased along with the increase of the voltage grade of the power transmission line.

6. The tandem recoil arc-extinguishing insulator according to claim 2, wherein: the diameter of the end insulator (5) is larger than that of the insulator (2), and the nozzle (7) is arranged at the upper end of the end insulator (5).

7. The tandem recoil arc-extinguishing insulator according to claim 2, wherein: the plurality of arc extinguishing channels (6) are arranged into arc extinguishing channel paths with multi-section Z-shaped sawtooth structures and are embedded in the end insulators (5).

8. The tandem recoil arc extinguishing insulator according to claim 3, wherein: the arc striking electrode (10) is arranged to be a conductive metal ring, and the outer side wall of the conductive metal ring is tightly attached to the inner wall of the recoil pipe (11).

9. The tandem recoil arc-extinguishing insulator according to claim 1, wherein: the arc guiding electrode (3) is of a metal lantern ring structure and is sleeved on the external metal connecting piece.

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