A lightning protection column type insulator structure for power distribution lines

Abstract

The lightning protection column type insulator structure of the power distribution line comprises a conductive mounting bracket, a main insulator, an auxiliary insulator, and guide arcs, the upper end of the main insulator is connected with one end of a first guide arc, a conductive sheet is arranged in the first guide arc and penetrates the first guide arc horizontally, the lower end of the main insulator is connected with one end of a second guide arc, the upper end of the auxiliary insulator is connected with one end of a third guide arc, and the lower end of the auxiliary insulator is connected with the conductive mounting bracket, a switching mechanism is arranged between the main insulator and the auxiliary insulator, the switching mechanism comprises a rotating shaft and an upper swing rod and a lower swing rod arranged on the rotating shaft, the upper swing rod and the lower swing rod each comprise a conductive rod penetrating the middle part of the swing rod and a conductive head connected with the end part of the conductive rod, the lower swing rod is connected with a conductive shaft in the rotating shaft, when the rotating shaft rotates, the conductive head can slide from one end of the corresponding guide arc to the other end, and the current is switched from the main insulator to the auxiliary insulator or from the auxiliary insulator to the main insulator, and the structure can avoid the occurrence of a one-way grounding fault.

Description

Technical Field

[0001] This invention relates to the field of power transmission and supply equipment technology, and in particular to a lightning protection post-type insulator structure for power distribution lines. Background Technology

[0002] Composite column insulators typically consist of an inner gap assembly, upper fittings, lower fittings, and nonlinear resistive elements. The upper fittings are connected to the transmission line, while the lower fittings are fixed to a conductive mounting bracket and grounded through the bracket or a grounding wire. During a lightning strike, the inner gap assembly breaks down, creating an ionization path. The equivalent resistance of the nonlinear resistive elements decreases, and current flows into the ground through the insulator's interior. After the lightning strike, the power frequency current flows down the ionization path, but at this moment, the equivalent resistance of the nonlinear resistive elements increases instantaneously, blocking the power frequency current. Subsequently, the ionization path closes, and the insulator recovers. If the lightning current is too large, the insulator body may be overloaded and damaged. After a lightning strike, if the nonlinear resistive elements fail to interrupt the power frequency current, the current flows into the ground through the insulator, causing a persistent single-phase grounding fault. Summary of the Invention

[0003] The purpose of this invention is to provide a lightning protection post-type insulator structure for power distribution lines, in order to solve the problem in the prior art that a continuous single-phase grounding fault occurs after the insulator body is damaged due to excessive lightning current. This lightning protection post-type insulator structure can automatically introduce the power frequency current flowing from the main insulator into the conductive mounting bracket into the secondary insulator, and then flow into the conductive mounting bracket through the secondary insulator, which can effectively avoid the occurrence of single-phase grounding faults.

[0004] To solve the above problems, the present invention provides a lightning protection post-type insulator structure for power distribution lines, which adopts the following technical solution:

[0005] A lightning protection post-type insulator structure for power distribution lines includes a conductive mounting bracket with a grounding wire, a main insulator, a secondary insulator, and a guide arc. Both ends of the main and secondary insulators have lead-out rods. The upper end of the main insulator is connected to one end of a first guide arc via the lead-out rod. A transversely penetrating conductive sheet is provided within the first guide arc. The lower end of the main insulator is connected to one end of a second guide arc via the lead-out rod. The upper end of the secondary insulator is connected to one end of a third guide arc via the lead-out rod, and the lower end of the secondary insulator is connected to the conductive mounting bracket. A switching mechanism is provided between the main and secondary insulators. The switching mechanism includes a rotating shaft mounted on the conductive mounting bracket and an upper swing rod and a lower swing rod mounted on the rotating shaft. The upper and lower swing rods each include a conductive rod penetrating the middle of the swing rod and a conductive head connected to the end of the conductive rod. The lower swing rod is connected to a conductive shaft within the rotating shaft. When the rotating shaft rotates, the conductive head can slide from one end of the corresponding guide arc to the other end, thus switching the current from the main insulator to the secondary insulator or from the secondary insulator to the main insulator.

[0006] Furthermore, the end of the lead-out rod extends into the housing of the guide arc, and the end of the lead-out rod has a flat arc-shaped portion.

[0007] Furthermore, the first guide arc, the second guide arc, and the third guide arc are all mounted on the conductive mounting bracket via an insulating frame.

[0008] Furthermore, the upper end of the rotating shaft has a retaining sleeve, and the middle part of the upper swing arm can be fixedly sleeved in the retaining sleeve.

[0009] Furthermore, the conductive shaft is located at the center of the lower section of the rotating shaft, and the lower end of the conductive shaft is connected to the conductive mounting bracket.

[0010] Furthermore, the lower end of the rotating shaft is connected to the drive assembly for transmission. A current sensor for detecting the current in the grounding wire and a controller for controlling the opening and closing of the drive assembly are provided between the drive assembly and the grounding wire. The current sensor and the controller are connected by signals.

[0011] Furthermore, an insulating spacer is fitted on the rotating shaft between the drive assembly and the conductive mounting bracket.

[0012] The beneficial effects of this invention are as follows:

[0013] 1. The present invention relates to a lightning protection post-type insulator structure for power distribution lines, comprising a main insulator, a secondary insulator, and a switching mechanism. Under normal circumstances, the power frequency current flows from the main insulator into the conductive mounting bracket and is introduced to the ground. When a lightning strike damages the main insulator, the drive assembly can rotate the shaft and the upper and lower swing arms, thereby cutting off the path between the lower end of the main insulator and the conductive mounting bracket, and simultaneously opening the path between the main insulator and the secondary insulator. The current flows through the upper swing arm into the secondary insulator and finally into the grounding wire of the conductive mounting bracket. This can automatically divert the power frequency current flowing from the main insulator into the conductive mounting bracket to the secondary insulator, and then from the secondary insulator into the conductive mounting bracket and into the ground, effectively preventing the occurrence of one-way grounding faults. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the initial state structure of the insulator of the present invention;

[0016] Figure 2 for Figure 1 Right view of the first guide arc in the middle;

[0017] Figure 3 for Figure 1 Right view of the second guide arc in the middle;

[0018] Figure 4 for Figure 1 Left view of the third guide arc in the middle;

[0019] Figure 5 This is a schematic diagram of the structure in this invention where the auxiliary insulator is activated after the main insulator is damaged;

[0020] Figure 6 for Figure 5 Right view of the first guide arc in the middle;

[0021] Figure 7 for Figure 5 Right view of the second guide arc in the middle;

[0022] Figure 8 for Figure 5 Left view of the third guide arc in the middle;

[0023] Figure 9 This is a half-sectional view of the upper swing arm;

[0024] Figure 10 This is a half-sectional view of the lower control arm;

[0025] Figure 11 This is a half-sectional view of the pivot.

[0026] Explanation of reference numerals in the figure: 1-Main insulator, 2-Secondary insulator, 3-Lead-out rod, 31-Flat arc-shaped part, 41-First guide arc, 411-Conductive sheet, 42-Second guide arc, 43-Third guide arc, 5-Rotating shaft, 51-Conductive shaft, 52-Clip sleeve, 61-Upper swing rod, 611-Conductive rod, 612-Conductive head, 62-Lower swing rod, 7-Current sensor, 8-Insulating sleeve, 9-Conductive mounting bracket, 10-Grounding wire, 11-Insulating frame, 12-Drive motor. Detailed Implementation

[0027] To make the technical objectives, technical solutions, and beneficial effects of the present invention clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] Example 1: A lightning protection post-type insulator structure for power distribution lines, such as Figure 1-11As shown, the invention includes a conductive mounting bracket 9 with a grounding wire 10, a main insulator 1, and a secondary insulator 2. Both ends of the main and secondary insulators have lead-out rods 3. The invention also includes guide arcs. In this embodiment, the first guide arc 41, the second guide arc 42, and the third guide arc 43 are all mounted on the conductive mounting bracket 9 via an insulating frame 11. The upper end of the main insulator 1 is connected to one end of the first guide arc 41 via the lead-out rod 3. The first guide arc 41 contains a transversely penetrating conductive sheet 411. The lower end of the main insulator 1 is connected to one end of the second guide arc 42 via the lead-out rod 3. The upper end of the secondary insulator 2 is connected to one end of the third guide arc 43 via the lead-out rod, and the lower end of the secondary insulator 2 is connected to the conductive mounting bracket 9.

[0029] A switching mechanism is provided between the main insulator 1 and the auxiliary insulator 2. The switching mechanism includes a rotating shaft 5 mounted on a conductive mounting bracket 9, and an upper swing rod 61 and a lower swing rod 62 mounted on the rotating shaft. The upper and lower swing rods each include a conductive rod 611 passing through the middle of the swing rod and a conductive head 612 connected to the end of the conductive rod. The lower swing rod 62 is connected to a conductive shaft 51 inside the rotating shaft. The conductive shaft 51 is located at the center of the lower section of the rotating shaft 5, and its lower end is connected to the conductive mounting bracket 9. When the rotating shaft 5 rotates, the conductive head 612 can slide from one end of the corresponding guide arc to the other end, thereby switching the current from the main insulator 1 to the auxiliary insulator 2 or from the auxiliary insulator 2 to the main insulator 1.

[0030] In this embodiment, the end of the lead-out rod 3 extends into the insulating shell of the guide arc, and the end of the lead-out rod has a conductive flat arc-shaped portion 31. The function of the flat arc-shaped portion is to ensure that the conductive head 612 can move smoothly to the flat arc-shaped portion 31.

[0031] The upper end of the rotating shaft 5 has a retaining sleeve 52, and the middle part of the upper swing rod 61 can be fixedly sleeved in the retaining sleeve 52.

[0032] The lower end of the rotating shaft 5 is connected to the drive motor 12. A current sensor 7 for detecting the current in the grounding wire 10 and a controller for controlling the opening and closing of the drive assembly are installed between the drive motor and the grounding wire 10. The current sensor is signal-connected to the controller. The current sensor 7 detects abnormal current in the grounding wire 10 and transmits this electrical signal to the controller, which then controls the rotation of the drive motor. When the current sensor detects an abnormal current in the grounding wire, the controller controls the drive motor 12 to rotate forward, and the upper swing arm 61 and the lower swing arm 62 rotate, as shown. Figure 5-8The left end of the upper swing rod 61 rotates to the right end of the first guide arc 41 (although the upper swing rod 61 is separated from the lead-out rod of the main insulator 1, it is always electrically connected to the lead-out rod of the main insulator 1 and can conduct electricity because the first guide arc 41 contains a conductive sheet 411). The right end of the upper swing rod 61 rotates to the right end of the third guide arc 43 (the upper swing rod 61 is connected to the upper lead-out rod of the auxiliary insulator 2 and can conduct electricity). The end of the lower swing rod 62 rotates to the right end of the second guide arc 42 (the lower swing rod 62 is separated from the lower lead-out rod of the main insulator 1 and cannot conduct electricity). Thus, the power frequency current that cannot be cut off by the nonlinear resistor sheet in the main insulator 1 is introduced into the auxiliary insulator 2 through the upper swing rod, and the power frequency current is introduced into the grounding wire 10 through the connection between the auxiliary insulator 2 and the conductive mounting bracket 9, and then introduced into the earth, thereby avoiding the occurrence of a one-way grounding fault.

[0033] An insulating sleeve 8 is fitted on the rotating shaft 5, between the drive motor 12 and the conductive mounting bracket 9.

[0034] The specific embodiments of the present invention are as follows:

[0035] In the initial state shown in Figure 1-4, the upper fitting on the main insulator 1 is connected to the transmission line, and the lower fitting on the main insulator 1 is connected to the conductive mounting bracket 9 via the lead-out rod 3, the lower swing rod 62, and the conductive shaft 51. The conductive mounting bracket 9 is grounded via the grounding wire 10. At this time, the main insulator 1 is in working condition. When a lightning strike causes damage to the main insulator, the current sensor detects a continuous power frequency current and transmits this information signal to the controller, which then issues a command. At this time, the controller controls the drive motor 12 to rotate forward, and the upper swing rod 61 and the lower swing rod 62 rotate with the shaft, switching to... Figure 5-8 As shown, the lower swing rod 62 is disconnected from the lower lead-out rod of the main insulator 1, resulting in an open circuit. The upper swing rod 61 is always electrically connected to the lead-out rod of the main insulator 1 and is conductive. The upper swing rod 61 is also connected to the upper lead-out rod of the auxiliary insulator 2 and is conductive. This allows the power frequency current that the nonlinear resistor in the main insulator 1 cannot cut off to be introduced into the auxiliary insulator 2 through the upper swing rod. The power frequency current is then introduced into the grounding wire 10 through the connection between the auxiliary insulator 2 and the conductive mounting bracket 9, and then into the earth, thereby avoiding a one-way grounding fault.

[0036] Finally, it should be noted that the above embodiments are only for illustration and not for limiting the technical solutions of the present invention. However, the protection scope of the present invention is not limited thereto. Any equivalent substitutions and modifications or partial substitutions made to the present invention that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A lightning protection post-type insulator structure for power distribution lines, comprising a conductive mounting bracket with a grounding wire, a main insulator, and a secondary insulator, characterized in that: It also includes guide arcs. Both ends of the main insulator and the auxiliary insulator have lead-out rods. The upper end of the main insulator is connected to one end of the first guide arc via the lead-out rod. A transversely penetrating conductive sheet is provided inside the first guide arc. The lower end of the main insulator is connected to one end of the second guide arc via the lead-out rod. The upper end of the auxiliary insulator is connected to one end of the third guide arc via the lead-out rod, and the lower end of the auxiliary insulator is connected to a conductive mounting bracket. A switching mechanism is provided between the main insulator and the auxiliary insulator. The switching mechanism includes a rotating shaft mounted on the conductive mounting bracket and an upper swing rod and a lower swing rod mounted on the rotating shaft. The upper and lower swing rods each include a conductive rod penetrating the middle of the swing rod and a conductive head connected to the end of the conductive rod. The lower swing rod is connected to a conductive shaft inside the rotating shaft. When the rotating shaft rotates, the conductive head can slide from one end of the corresponding guide arc to the other end, thus switching the current from the main insulator to the auxiliary insulator or from the auxiliary insulator to the main insulator.

2. The lightning protection post-type insulator structure for power distribution lines according to claim 1, characterized in that: The end of the lead-out rod extends into the outer shell of the guide arc, and the end of the lead-out rod has a flat arc-shaped portion.

3. The lightning protection post-type insulator structure for power distribution lines according to claim 1, characterized in that: The first guide arc, the second guide arc, and the third guide arc are all mounted on the conductive mounting bracket via an insulating frame.

4. The lightning protection post-type insulator structure for power distribution lines according to claim 1, characterized in that: The upper end of the rotating shaft has a retaining sleeve, and the middle part of the upper swing arm can be fixedly sleeved in the retaining sleeve.

5. The lightning protection post-type insulator structure for power distribution lines according to claim 1, characterized in that: The conductive shaft is located at the center of the lower section of the rotating shaft, and the lower end of the conductive shaft is connected to the conductive mounting bracket.

6. The lightning protection post-type insulator structure for power distribution lines according to claim 1, characterized in that: The lower end of the rotating shaft is connected to the drive assembly for transmission. A current sensor for detecting the current in the grounding wire and a controller for controlling the opening and closing of the drive assembly are provided between the drive assembly and the grounding wire. The current sensor and the controller are connected by signal.

7. The lightning protection post-type insulator structure for power distribution lines according to claim 1, characterized in that: An insulating sleeve is fitted on the rotating shaft between the drive assembly and the conductive mounting bracket.

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