CN113284682B - Strain insulator assembly - Google Patents
Strain insulator assembly Download PDFInfo
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- CN113284682B CN113284682B CN202110528287.5A CN202110528287A CN113284682B CN 113284682 B CN113284682 B CN 113284682B CN 202110528287 A CN202110528287 A CN 202110528287A CN 113284682 B CN113284682 B CN 113284682B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/42—Means for obtaining improved distribution of voltage; Protection against arc discharges
- H01B17/46—Means for providing an external arc-discharge path
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/02—Suspension insulators; Strain insulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/38—Fittings, e.g. caps; Fastenings therefor
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- Power Engineering (AREA)
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Abstract
The invention provides a tension insulator assembly. The strain insulator subassembly includes: an insulator having a first end and a second end disposed opposite each other; the first arc striking structure is connected with the first end of the insulator and comprises a first discharge part for discharging; the second arc striking structure is connected with the second end of the insulator and comprises a second discharge part used for discharging, and a discharge gap is formed between the first discharge part and the second discharge part; at least part of the first arc striking structure and at least part of the second arc striking structure extend along the axial direction of the insulator, and the first discharging part is movably arranged along the axial direction of the insulator relative to the second discharging part so as to adjust the length L of the discharging gap. The strain insulator assembly has the discharge gap with adjustable length, so that the strain insulator assembly can adapt to different grounding systems.
Description
Technical Field
The invention relates to the technical field of medium-voltage overhead insulated wires, in particular to a tension insulator assembly.
Background
In the power distribution network, the overhead insulated conductor solves the safety problems of a line corridor and the like relative to the bare conductor. However, overhead insulated conductors often suffer from lightning strike wire breakage. According to statistical data, the broken line accident caused by lightning strike of the overhead insulated conductor accounts for more than 90% of the total number of broken lines, thus seriously affecting the normal power supply of the wire network.
In the operation of the circuit, the tension insulator is used for bearing the tension of the wire so as to play a role in fixing the wire. However, the tension insulator often has explosion or burning loss caused by lightning strike, which causes problems such as single-phase grounding, interphase short circuit, wire breakage and the like.
The inventor knows that a strain insulator has a lightning protection function, but the length of a discharge gap is not adjustable, so that a grounding system applicable to the strain insulator is single.
Disclosure of Invention
The invention mainly aims to provide a tension insulator assembly, which is provided with a discharge gap with adjustable length, so that the tension insulator assembly can adapt to different grounding systems.
In order to achieve the above object, the present invention provides a tension insulator assembly, comprising: an insulator having a first end and a second end disposed opposite each other; the first arc striking structure is connected with the first end of the insulator and comprises a first discharge part for discharging; the second arc striking structure is connected with the second end of the insulator and comprises a second discharge part used for discharging, and a discharge gap is formed between the first discharge part and the second discharge part; at least part of the first arc striking structure and at least part of the second arc striking structure extend along the axial direction of the insulator, and the first discharging part is movably arranged along the axial direction of the insulator relative to the second discharging part so as to adjust the length L of the discharging gap.
Further, be equipped with the installation through-hole on the first portion that discharges, the internal face of installation through-hole is equipped with the internal thread, and strain insulator subassembly still includes the connection structure who is used for connecting insulator and first portion that discharges, and connection structure includes the connecting piece of being connected with the first end of insulator, and the outer wall of at least part connecting piece is equipped with the external screw thread, external screw thread and internal screw thread cooperation.
Further, the tension insulator assembly further comprises a first locking member for locking the first discharging part on the connecting member, wherein the first locking member is located on the periphery of the connecting member and connected with the connecting member.
Further, the connecting piece includes first axle section and the second axle section of being connected with first axle section, and the axis of second axle section is parallel with the axis of insulator, and first axle section and second axle section are the contained angle setting, and first axle section is connected with the first end of insulator, and the second axle section is connected with first discharge part.
Further, the connection structure further includes: the connecting sleeve is connected with the first end of the insulator, an assembly through hole and a mounting hole communicated with the assembly through hole are formed in the connecting sleeve, an included angle is formed between the mounting hole and the assembly through hole, and at least part of the first shaft section of the connecting piece is positioned in the assembly through hole; the locating piece passes through the mounting hole and is in butt joint or connection with the first shaft section.
Further, the tension insulator assembly further comprises: the first hardware fitting is positioned at the periphery of the first end of the insulator, and an assembly hole is formed in the first hardware fitting; and the connecting part penetrates through the assembly hole and is connected with the connecting sleeve so as to connect the first hardware fitting with the connecting sleeve.
Further, the second arc striking structure further includes: the arc striking body is connected with the second discharging part; the umbrella skirts are arranged at intervals along the axial direction of the striking body, and are all positioned on the periphery of the striking body.
Further, the first discharge portion includes a spherical electrode or a round bar electrode; alternatively, the second discharge portion includes a spherical electrode or a round bar electrode; alternatively, the distance between the first striking structure and the axis of the insulator is equal to the distance between the second striking structure and the axis of the insulator.
Further, the strain insulator subassembly includes the connection structure that is connected with the second gold utensil of the second end of insulator and two along the axis direction interval setting of insulator, and the striking body of second striking structure passes through connection structure and is connected with the second gold utensil, and the strain insulator subassembly still includes the second retaining member that is used for locking striking body on at least part connection structure.
Further, the two connection structures are symmetrically arranged relative to a longitudinal center line of the insulator, the longitudinal center line is a straight line perpendicular to the axis of the insulator, and the distance between the straight line and the end face of the first end of the insulator is equal to the distance between the straight line and the end face of the second end of the insulator.
By applying the technical scheme of the invention, the first arc striking structure with the first discharging part is arranged at the first end of the insulator, the second arc striking structure with the second discharging part is arranged at the second end of the insulator, the discharging gap is arranged between the first discharging part and the second discharging part, and the first discharging part is movably arranged along the axis of the insulator relative to the second discharging part, so that the length of the discharging gap can be adjusted, and the discharging voltage of the discharging gap can be controlled, so that the tension insulator assembly can be suitable for different grounding systems on the premise of having a lightning protection function.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 illustrates a schematic diagram of a strain insulator assembly according to an embodiment of the present invention;
FIG. 2 shows a cross-sectional view of the tension insulator assembly of FIG. 1;
FIG. 3 illustrates a partial enlarged view of the tension insulator assembly of FIG. 1; and
fig. 4 shows another partial enlarged view of the tension insulator assembly of fig. 1.
Wherein the above figures include the following reference numerals:
10. a first arc striking structure; 11. a first discharge section; 111. mounting through holes; 20. a second arc striking structure; 21. an arc striking body; 22. a second discharge section; 23. umbrella skirt; 30. an insulator; 40. a connection structure; 41. a connecting piece; 411. a first shaft section; 412. a second shaft section; 50. a first locking member; 51. a positioning piece; 52. a second locking member; 60. a connecting sleeve; 61. assembling the through hole; 71. a first hardware fitting; 72. a second hardware fitting; 80. and a connecting part.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
In the prior art, for the problem of lightning stroke breakage of an insulated high-voltage wire, two corresponding counter measures are 'dredging' and 'blocking'.
Wherein, the dredging is to bare the local part of the insulated high-voltage wire near the ceramic insulator, so that the arc root of the power frequency arc is transferred or fixed on a special hardware fitting to burn, thereby protecting the wire from burning. Whereas the commonly used dredging type product on the straight line rod of medium voltage overhead insulated lines is a discharge clamping porcelain insulator. The insulator enables the electric arc to be fixed between the mounting seat of the insulator and the striking plate for burning, so that broken wires caused by lightning strike are prevented. However, the above-described insulator has several drawbacks:
the problem that the line trips due to lightning flashover cannot be avoided, so that the lightning trip rate cannot be reduced;
because the lightning discharge path is closer to the insulator umbrella skirt, the insulator umbrella skirt can be burnt or burst when the power frequency arc burns after lightning strike discharge in some cases;
the insulated wire needs to be stripped and installed, which can damage the insulation of the wire.
Wherein, the blocking is to prevent the power frequency follow current from arcing after lightning flashover. A commonly used blocking product in medium voltage overhead insulated lines is an insulator parallel with a gap arrester. The lightning arrester with the gap can avoid tripping of the circuit caused by lightning strike, and has good protection effect. However, the gapped arresters suffer from several drawbacks:
the insulator needs to be matched with the lightning arrester for use and is installed respectively, so that the installation workload and the investment are increased;
the gap distance of a part of the lightning arresters needs to be adjusted during installation, and the gap distance of air in the subsequent line operation changes, so that the protection effect is poor, and a certain potential safety hazard exists;
the installation of the insulator and the arrester is complicated, which increases the installation cost.
From the above, the existing discharge clamping porcelain insulator and the existing gap lightning arrester cannot completely and reliably solve the problem of lightning breakage of the overhead insulated wire, and have the problem of poor stability.
It should be noted that, the lightning protection measures of the current 10kV strain insulator generally refer to the lightning protection measures of the linear rod insulator, and all adopt insulator parallel connection outer series gap lightning arresters, so that the problem of complex construction can be generated, and certain risks exist, for example: the lightning arrester lead wire is required to be peeled off and installed when being fixed with a 10kV insulated wire, so that an insulating layer of the wire can be damaged; the lead wire of the arrester is arranged externally, so that the probability of damaging the lead wire of the arrester is increased, and the problem that the insulator loses the protection of the arrester due to the falling off of the lead wire of the arrester occurs in the operation of a circuit.
Therefore, the embodiment of the invention provides a tension insulator assembly with a lightning protection function, and before the tension insulator assembly is installed, the length L of a discharge gap can be adjusted to adapt to different grounding systems; and has the characteristic of stable discharge gap after installation.
It should be noted that, in the embodiment of the present invention, the first arc striking structure 10 and the second arc striking structure 20 (lightning arrester) are both connected with the insulator 30, so that the lightning arrester and the insulator can form a modularized structure, therefore, the installation method of the tension insulator assembly is the same as that of a common tension insulator, and the installation method of the tension insulator assembly is simple and requires less installation workload.
The invention also discloses a method for manufacturing the strain insulator assembly, which comprises the steps of installing the strain insulator assembly, and installing the strain insulator assembly.
It should be noted that, in the embodiment of the present invention, the lightning arrester is connected in parallel between the high-voltage line and the ground line, and different ground systems have different overvoltage levels, so the discharge voltage can be controlled by adjusting the length L of the discharge gap, so that the lightning arrester can adapt to different overvoltage levels, and thus the tension insulator assembly is suitable for different ground systems.
As shown in fig. 1, an embodiment of the present invention provides a tension insulator assembly. The tension insulator assembly includes an insulator 30, a first striking structure 10, and a second striking structure 20. Wherein the insulator 30 has oppositely disposed first and second ends; the first striking structure 10 is connected with a first end of the insulator 30, and the first striking structure 10 includes a first discharge portion 11 for discharging; the second striking structure 20 is connected with the second end of the insulator 30, the second striking structure 20 comprises a second discharge portion 22 for discharging, and a discharge gap is formed between the first discharge portion 11 and the second discharge portion 22; wherein at least part of the first striking structure 10 and at least part of the second striking structure 20 extend along the axial direction of the insulator 30, and the first discharge portion 11 is movably disposed along the axis of the insulator 30 with respect to the second discharge portion 22 to adjust the length L of the discharge gap.
In the above technical solution, the first arc striking structure 10 having the first discharge portion 11 is disposed at the first end of the insulator 30, the second arc striking structure 20 having the second discharge portion 22 is disposed at the second end of the insulator 30, a discharge gap is disposed between the first discharge portion 11 and the second discharge portion 22, and the first discharge portion 11 is movably disposed along the axis of the insulator relative to the second discharge portion 22, so that the length L of the discharge gap can be adjusted, and thus the discharge voltage of the discharge gap can be controlled, so that the tension insulator assembly can be suitable for different grounding systems under the premise of having a lightning protection function.
Specifically, in the embodiment of the present invention, the second striking structure 20 is connected to the second end (low voltage side) of the insulator 30, the second end of the insulator is connected to the ground, so that a low potential is formed on the second discharge portion 22, the first striking structure 10 is connected to the first end (high voltage side) of the insulator 30, and the first end of the insulator is connected to the high voltage line (wire having a voltage of 10 kv), so that a high potential is formed on the first discharge portion 11, and thus, a discharge gap is provided between the first discharge portion 11 and the second discharge portion 22, so that a lightning strike flashover passage and an arc discharge gap can be provided for lightning.
Further, the operating voltage of the discharge gap is lower than that of the insulator 30, so that the discharge gap acts before the insulator 30 is flashover, thereby guiding the lightning voltage, and protecting the insulator and the wire. When the overhead distribution network is struck by direct lightning or senses lightning, the discharge gap between the first discharge part 11 and the second discharge part 22 can be firstly discharged before the insulator 30 is flashover, so that a flashover channel of lightning is provided for lightning voltage, and thus, a power frequency arc or an arc root of single-phase short-circuit current established on the lightning flashover channel can only be fixed on the first discharge part 11 and the second discharge part 22, thereby avoiding arc channeling to the insulator 30 or a wire, and further avoiding the problems of umbrella skirt burn of the insulator 30 and insulated wire blowing.
Preferably, in the embodiment of the present invention, the discharge voltage of the discharge gap is 60% to 80% of the 50% lightning impulse discharge voltage of the protected insulator 30, so that the insulator 30 is protected by the discharge gap discharging first.
It should be noted that, since the discharge voltage of the discharge gap is easily affected by external factors such as altitude and dry humidity, and is also easily affected by the degree of insulation fit of the protected object, the influence of the factors can be reduced by adjusting the length L of the discharge gap, thereby better protecting the insulator 30 and the wire.
Preferably, in the embodiment of the present invention, the length L of the discharge gap can be adjusted according to the degree of insulation fit of the object to be protected, and the range of movement of the first discharge portion 11 along the axis of the insulator 30 is 0mm or more and 10mm or less.
As shown in fig. 2 and 4, in the embodiment of the present invention, the first discharging part 11 is provided with a mounting through hole 111, an inner wall surface of the mounting through hole 111 is provided with an internal thread, the tension insulator assembly further includes a connection structure 40 for connecting the insulator 30 and the first discharging part 11, the connection structure 40 includes a connection member 41 connected to a first end of the insulator 30, at least part of an outer wall surface of the connection member 41 is provided with an external thread, and the external thread is matched with the internal thread.
In the above-described embodiments, by screwing the first discharge portion 11, the rotational movement of the first discharge portion 11 with respect to the connector 41 can be converted into the linear movement of the first discharge portion 11 with respect to the connector 41, so that the distance between the first discharge portion 11 and the second discharge portion 22 can be adjusted, that is, the length L of the discharge gap can be adjusted.
Specifically, in the embodiment of the present invention, the number of the connection structures 40 is two, and the second discharge portion 22 is connected to the second end of the insulator 30 through one connection structure 40 of the two.
As shown in fig. 1 and 2, in the embodiment of the present invention, the tension insulator assembly further includes a first locking member 50 for locking the first discharging part 11 to the connection member 41, and the first locking member 50 is located at the outer circumference of the connection member 41 and connected to the connection member 41.
Through the above-mentioned setting, after adjusting the length L of discharge gap, can lock first discharge portion 11 on connecting piece 41 through first retaining member 50, like this, can avoid first discharge portion 11 to take place axial displacement to can avoid the length L of discharge gap to change the problem when the strain insulator subassembly during operation (i.e. install in the distribution network after), and then can make discharge gap discharge stable, can avoid the length L of discharge gap not fixed and lead to the problem that lightning protection effect is not good like this.
Specifically, in the embodiment of the present invention, the first discharging part 11 is connected to the first end of the insulator 30, and the second discharging part 22 is connected to the second end of the insulator 30, so that the length L of the discharging gap is adjusted before installation, and the length L of the discharging gap does not need to be specially adjusted when the tension insulator assembly is installed, so that the length L of the empty discharging gap can be ensured to be unchanged, and the discharging of the first discharging part 11 and the second discharging part 22 is stabilized.
Preferably, in the embodiment of the present invention, the first locking member 50 is a locking nut, an internal thread of the locking nut is in threaded engagement with an external thread on the connecting member 41, and an end surface of the locking nut abuts against the first discharging portion 11. Of course, in alternative embodiments not shown in the drawings, the first locking member 50 may also be engaged with the connecting member 41, so long as the first discharging portion 11 is prevented from moving axially.
As shown in fig. 2, in the embodiment of the present invention, the connecting member 41 includes a first shaft section 411 and a second shaft section 412 connected to the first shaft section 411, the axis of the second shaft section 412 is parallel to the axis of the insulator 30, the first shaft section 411 and the second shaft section 412 form an included angle, the first shaft section 411 is connected to the first end of the insulator 30, and the second shaft section 412 is connected to the first discharging portion 11.
By the above arrangement, the extending direction of the first discharging portion 11 connected to the second shaft section 412 can be made parallel to the axis of the insulator 30, so that the vertical distance between the axis of the second shaft section 412 and the axis of the insulator 30 is equal to the vertical distance between the axis of the first discharging portion 11 and the axis of the insulator 30, thereby making the connector 41 better guide the arc to the first discharging portion 11, avoiding the arc from jumping to the insulator 30.
Similarly, in the embodiment of the present invention, the second discharge portion 22 is connected to the second end of the insulator 30 through the first shaft section 411 and the second shaft section 412 of the connector 41, so that the extending direction of the second discharge portion 22 is parallel to the axial direction of the insulator 30, and thus the connector 41 better guides the arc to the second discharge portion 22, so that the discharge gap between the first discharge portion 11 and the second discharge portion 22 is better discharged.
Specifically, in the embodiment of the present invention, the included angle between the first shaft section 411 and the second shaft section 412 is 90 °, that is, the first shaft section 411 and the second shaft section 412 form an L-shaped structure.
As shown in fig. 2 and 3, in the embodiment of the present invention, the connection structure 40 further includes a connection sleeve 60 and a positioning member 51. Wherein, the connecting sleeve 60 is connected with the first end of the insulator 30, the connecting sleeve 60 is provided with an assembly through hole 61 and a mounting hole communicated with the assembly through hole 61, an included angle is formed between the mounting hole and the assembly through hole 61, and at least part of the first shaft section 411 of the connecting piece 41 is positioned in the assembly through hole 61; the positioning member 51 abuts or connects with the first shaft section 411 through the mounting hole.
With the above arrangement, the first discharge portion 11 can be connected to the first end of the insulator 30 through the connector 41, the positioning member 51 and the connection sleeve 60, thereby fixing the first discharge portion 11 to the first end of the insulator 30.
Preferably, in the embodiment of the present invention, the number of the connection sleeves 60 is two, and the second discharge portion 22 is also connected to the second end of the insulator 30 through the connection member 41, the positioning member 51 and the connection sleeve 60, so that a relatively fixed distance between the first discharge portion 11 and the second discharge portion 22 is provided, thereby ensuring that the length L of the discharge gap is not changed after the voltage-resistant insulator assembly is mounted.
Specifically, in the embodiment of the present invention, the positioning member 51 is connected to the connecting member 41 through the mounting hole, so that on the one hand, the fixing function of the connecting member 41 can be achieved; on the other hand, the length and the orientation of the connecting member 41 penetrating into the connecting sleeve 60 may be defined to prevent the connecting member 41 from rotating and to ensure that the distance between the axis of the second shaft section 412 and the axis of the insulator 30 is unchanged, so that the positioning member 5 plays a role in positioning the connecting member 41, and thus the first discharging portion 11 and the second discharging portion 22, which are respectively connected with the two connecting structures 40, can be more stably discharged.
Preferably, in the embodiment of the present invention, the positioning member 51 is connected to the connecting member 41 by a threaded connection. Of course, in an alternative embodiment not shown in the drawings, the positioning member 51 may abut against the connecting member 41, that is, the positioning member 51 is screwed with the mounting hole on the connecting sleeve 60, and by rotating the positioning member 51, one end of the positioning member 51 can abut against the outer wall surface of the connecting member 41, thereby achieving the fixing effect on the connecting member 41.
Preferably, in the embodiment of the present invention, the angle between the mounting hole and the fitting through hole 61 is 90 °.
As shown in fig. 2, in the embodiment of the present invention, the tension insulator assembly further includes a first fitting 71 and a connection portion 80. Wherein, part of the first hardware fitting 71 is positioned at the periphery of the first end of the insulator 30, and the first hardware fitting 71 is provided with an assembly hole; the connection portion 80 is connected with the connection sleeve 60 through the fitting hole to connect the first fitting 71 and the connection sleeve 60.
With the above arrangement, the first end of the insulator 30 can be connected with the connection sleeve through the first fitting 71 and the connection portion 80, thereby connecting the first end of the insulator 30 with the connection piece 41 to transmit the lightning strike arc to the first discharge portion 11 by the first fitting 71, the connection portion 80, the connection sleeve 60 and the connection piece 41, and discharge through the discharge gap.
Further, the contact surface between the connecting portion 80 and the first fitting 71 is a plane, so that the installation force between the connecting portion 80 and the first fitting 71 is uniformly distributed, and the connecting portion 80 and the first fitting 71 are combined more tightly, so that the risk of stress displacement between the connecting portion 80 and the first fitting 71 is avoided, and further, the tension insulator assembly can be ensured to be stable in structure for a long time when the line operates, and the length L of the discharge gap is ensured not to be changed due to breeze vibration in the external environment.
Preferably, in the embodiment of the present invention, the connection portion 80 is connected to the connection sleeve 60 by a threaded connection.
As shown in fig. 2, in the embodiment of the present invention, the second striking structure 20 further includes a striking body 21 and a plurality of umbrella skirts 23. Wherein the arc striking body 21 is connected with the second discharging part 22; along the axis direction of the striking body 21, the plurality of sheds 23 are arranged at intervals, and the plurality of sheds 23 are all positioned on the periphery of the striking body 21.
Through the above arrangement, the creepage distance between the high voltage end and the low voltage end of the striking body 21 (i.e., along the two ends of the striking body 21 in the axial direction) can be increased, thereby avoiding the striking body 21 from being broken down by the voltage between the high voltage end and the low voltage end, and protecting the striking body 21.
As shown in fig. 1, in the embodiment of the present invention, the first discharge portion 11 includes a round bar electrode, and the second discharge portion 22 includes a spherical electrode.
With the above arrangement, the discharge gap between the first discharge portion 11 and the second discharge portion 22 can be better discharged.
In the embodiment of the invention, the circular discharge electrode of the first discharge part 11 is fixed on the first fitting 71 at the high-voltage end of the insulator, the spherical electrode of the second discharge part 22 is fixed on the second fitting 72 at the low-voltage end of the insulator, and the discharge gap is not required to be adjusted and the distance can be kept constant after the installation, so that the air gap distance is not changed, the lightning arrester is stable in discharge, and the problem of poor lightning protection effect caused by the unfixed discharge gap distance is avoided.
Preferably, in an embodiment of the invention, the diameter of the ball electrode ranges between 40mm and 100mm.
Of course, in alternative embodiments not shown in the drawings, it is also possible that the first discharge portion 11 comprises a spherical electrode and the second discharge portion 22 comprises a rod-shaped electrode.
As shown in fig. 1, in the embodiment of the present invention, the distance between the first striking structure 10 and the axis of the insulator 30 is equal to the distance between the second striking structure 20 and the axis of the insulator 30.
By the above arrangement, the distance between the first discharge portion 11 and the axis of the insulator 30 and the distance between the second discharge portion 22 and the axis of the insulator 30 can be made equal, and thus, the axis of the first discharge portion 11 and the axis of the second discharge portion 22 can be made to coincide, so that the discharge gap is made to be parallel to the axis of the insulator 30, and further, the discharge gap can be better discharged.
Preferably, in an embodiment of the present invention, the distance between the first striking structure 10 and the axis of the insulator 30 ranges from 50mm to 100mm. This allows the first striking structure 10 to be adapted to insulators of different sizes.
As shown in fig. 1 and 2, in the embodiment of the present invention, the tension insulator assembly includes a second fitting 72 connected to the second end of the insulator 30 and two connection structures 40 spaced along the axial direction of the insulator 30, the striking body 21 of the second striking structure 20 is connected to the second fitting 72 through the connection structures 40, and the tension insulator assembly further includes a second locking member 52 for locking the striking body 21 to at least part of the connection structures 40.
Through the arrangement, after the second striking structure 20 is installed, the second discharging part 22 can be locked on the connecting structure 40 through the second locking piece 52, so that the second discharging part 22 can be prevented from moving axially, the problem that the length L of a discharging gap is changed when the tension insulator assembly works (namely after the tension insulator assembly is installed in a power distribution network) can be avoided, the discharging of the discharging gap can be stabilized, and the problem that the lightning protection effect is poor due to the fact that the length L of the discharging gap is not fixed can be avoided.
Preferably, in the embodiment of the present invention, the second locking member 52 is a locking nut, the internal thread of the locking nut is matched with the external thread on at least part of the connecting structure 40, and the end surface of the locking nut abuts against part of the second arc striking structure 20. Of course, in alternative embodiments not shown in the drawings, the second locking member 52 may also be snap-fitted with the connecting member 41 of at least part of the connecting structure 40, as long as the second striking structure 20 is prevented from axial movement.
Preferably, in the embodiment of the present invention, the second striking structure 20 is connected to the second hardware 72 through the connection structure 40, however, in an alternative embodiment not shown in the drawings, the second striking structure 20 may be connected to the second hardware 72 through other connection structures.
As shown in fig. 2, in the embodiment of the present invention, the two connection structures 40 are symmetrically disposed with respect to the longitudinal center line of the insulator 30, the longitudinal center line is a straight line perpendicular to the axis of the insulator 30, and the distance between the straight line and the end face of the first end of the insulator 30 is equal to the distance between the straight line and the end face of the second end of the insulator 30.
In the above-mentioned solution, the first discharge portion 11 and the second discharge portion 22 are respectively fixed at the first end and the second end of the insulator 30 by two symmetrically arranged connection structures 40, so that a fixed discharge gap is formed between the first discharge portion 11 and the second discharge portion 22.
Preferably, in the embodiment of the present invention, the materials of the first discharge portion 11, the second discharge portion 22, the connection member 41 and the connection sleeve 60 may be selected to be metal materials such as aluminum materials or steel materials.
Preferably, in the embodiment of the present invention, the surfaces of the first discharge portion 11, the second discharge portion 22, the connection member 41 and the connection sleeve 60 may be all subjected to corrosion-preventing treatment.
Preferably, as shown in fig. 2, in the embodiment of the present invention, the second striking structure 20 is a lightning arrester.
It should be noted that, in the embodiment of the present invention, the lightning arrester needs to satisfy the following parameters:
rated voltage, its value range is 13kv to 17kv;
a nominal discharge current, which takes a value of 5kA or 10kA;
4/10 mu s of impact current value, which is 65kA or 100kA;
a 2ms square wave current, which takes on a value of 150A or 400A.
Other parameters of the lightning arrester can be implemented according to the specification of national standard GB/T32520-2016 (out-of-band series gap metal oxide lightning arrester (EGLA) for overhead transmission and distribution lines with an alternating current of more than 1 kV).
In the embodiment of the invention, the positive polarity 50% lightning impulse discharge voltage of the tension insulator assembly is in the range of 70kV to 110kV, and the discharge voltage is controlled by the length L of the discharge gap.
From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: through setting up the first striking structure that has first portion that discharges at the first end of insulator, set up the second striking structure that has second portion that discharges at the second end of insulator, have the discharge gap between first portion that discharges and the second portion that discharges to first portion that discharges is for the second portion that discharges along the axis of insulator movably sets up, can adjust the length of discharge gap like this, thereby can control the discharge voltage of discharge gap, so that strain insulator subassembly can be applicable to different earthing systems under the prerequisite that has the lightning protection function.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A tension insulator assembly, comprising:
an insulator (30) having oppositely disposed first and second ends;
a first striking structure (10) connected to a first end of the insulator (30), the first striking structure (10) comprising a first discharge portion (11) for discharging;
a second striking structure (20) connected with the second end of the insulator (30), wherein the second striking structure (20) comprises a second discharge part (22) for discharging, and a discharge gap is formed between the first discharge part (11) and the second discharge part (22);
wherein at least part of the first striking structure (10) and at least part of the second striking structure (20) extend along the axial direction of the insulator (30), and the first discharge portion (11) is movably disposed along the axis of the insulator (30) with respect to the second discharge portion (22) to adjust the length L of the discharge gap;
the first discharging part (11) is provided with a mounting through hole (111), the inner wall surface of the mounting through hole (111) is provided with an internal thread, the tension insulator assembly further comprises a connecting structure (40) used for connecting the insulator (30) and the first discharging part (11), the connecting structure (40) comprises a connecting piece (41) connected with the first end of the insulator (30), at least part of the outer wall surface of the connecting piece (41) is provided with an external thread, and the external thread is matched with the internal thread;
the tension insulator assembly further comprises a first locking piece (50) used for locking the first discharging part (11) on the connecting piece (41), wherein the first locking piece (50) is positioned on the periphery of the connecting piece (41) and is connected with the connecting piece (41);
the connection structure (40) further comprises: the connecting sleeve (60) is connected with the first end of the insulator (30), an assembly through hole (61) and a mounting hole communicated with the assembly through hole (61) are formed in the connecting sleeve (60), an included angle is formed between the mounting hole and the assembly through hole (61), and at least part of the first shaft section (411) of the connecting piece (41) is located in the assembly through hole (61);
and the positioning piece (51) can fix the connecting piece so as to realize stable discharge of the first discharging part and the second discharging part.
2. The tension insulator assembly according to claim 1, characterized in that the connecting piece (41) comprises a first shaft section (411) and a second shaft section (412) connected with the first shaft section (411), the axis of the second shaft section (412) is parallel to the axis of the insulator (30), the first shaft section (411) and the second shaft section (412) are arranged at an included angle, the first shaft section (411) is connected with the first end of the insulator (30), and the second shaft section (412) is connected with the first discharge part (11).
3. The tension insulator assembly of claim 1, further comprising:
a first fitting (71), wherein a part of the first fitting (71) is positioned at the periphery of the first end of the insulator (30), and an assembly hole is formed in the first fitting (71);
and a connecting portion (80), wherein the connecting portion (80) is connected with the connecting sleeve (60) through the assembly hole so as to connect the first fitting (71) and the connecting sleeve (60).
4. The tension insulator assembly according to claim 1 or 2, characterized in that the second striking structure (20) further comprises:
an arc striking body (21) connected to the second discharge unit (22);
the umbrella skirts (23) are arranged at intervals along the axial direction of the arc striking body (21), and the umbrella skirts (23) are all located on the periphery of the arc striking body (21).
5. The tension insulator assembly according to claim 1 or 2, characterized in that the first discharge portion (11) comprises a spherical electrode or a round rod electrode; alternatively, the second discharge section (22) includes a spherical electrode or a round rod electrode; alternatively, the distance between the first striking structure (10) and the axis of the insulator (30) is equal to the distance between the second striking structure (20) and the axis of the insulator (30).
6. The tension insulator assembly according to claim 1 or 2, characterized in that the tension insulator assembly comprises a second fitting (72) connected with the second end of the insulator (30) and two connecting structures (40) arranged at intervals along the axial direction of the insulator (30), wherein the striking body (21) of the second striking structure (20) is connected with the second fitting (72) through the connecting structures (40), and the tension insulator assembly further comprises a second locking member (52) for locking the striking body (21) on at least part of the connecting structures (40).
7. The tension insulator assembly according to claim 1 or 2, characterized in that two of the connection structures (40) are symmetrically arranged with respect to a longitudinal centre line of the insulator (30), the longitudinal centre line being a straight line perpendicular to the axis of the insulator (30), and the distance between the straight line and the end face of the first end of the insulator (30) is equal to the distance between the straight line and the end face of the second end of the insulator (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110528287.5A CN113284682B (en) | 2021-05-14 | 2021-05-14 | Strain insulator assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110528287.5A CN113284682B (en) | 2021-05-14 | 2021-05-14 | Strain insulator assembly |
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| CN113284682A CN113284682A (en) | 2021-08-20 |
| CN113284682B true CN113284682B (en) | 2023-08-08 |
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| CN202110528287.5A Active CN113284682B (en) | 2021-05-14 | 2021-05-14 | Strain insulator assembly |
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| CN204680493U (en) * | 2015-06-26 | 2015-09-30 | 国家电网公司 | Insulator lightning protection system |
| CN206388575U (en) * | 2016-10-31 | 2017-08-08 | 中铁二院工程集团有限责任公司 | The adjustable transmission line of electricity arcing horn of a kind of size and gap |
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2021
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| CN201051641Y (en) * | 2007-06-13 | 2008-04-23 | 杭州永德电器有限公司 | Arrester with external serial gap |
| CN201118095Y (en) * | 2007-11-24 | 2008-09-17 | 山东迅实电气有限公司 | Bare wire lightning arrestor for preventing elevated bare wire breaking from lighting strike |
| CN201498967U (en) * | 2009-08-28 | 2010-06-02 | 南京紫金电力保护设备有限公司 | Angle-form over-voltage protection device |
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| CN113284682A (en) | 2021-08-20 |
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