Power transmission line grounding detection tool

Abstract

The utility model provides a power transmission line grounding detection tool, and belongs to the field of power transmission line maintenance. According to the technical scheme, the power transmission line grounding detection tool comprises a connecting conductor and a grounding terminal, the grounding terminal is conductively connected with one end of the connecting conductor, the power transmission line grounding detection tool further comprises an anchor rod assembly, the anchor rod assembly comprises a rod body and a pressing disc, the grounding terminal is installed at the lower end of the rod body, and the lower end of the grounding terminal is conical. The connecting conductor passes through the center of the rod body and is connected with the grounding terminal. The pressure plate is arranged at the upper end of the rod body. The detection tool is of an anchor rod type structure, the rod body and the grounding terminal at the lower end of the rod body are inserted into the stratum by applying pressure to the pressing disc, operation is rapid and convenient, meanwhile, the rod body squeezes soil all around during insertion, and the soil is more compact and makes contact with the grounding terminal more tightly.

Description

Technical Field

[0001] The utility model relates to the field of transmission line maintenance, in particular to a grounding detection tool for transmission lines. Background Art

[0002] In a long-distance power transmission system, transmission lines need to be supported by power transmission towers along the line. During the operation and maintenance of the power system, it is necessary to regularly detect the grounding resistance of the tower poles. The three-electrode method is preferably used for detecting the power frequency resistance of the tower poles. When using the three-electrode method for detection, a reasonable electrode arrangement method should be adopted to improve the credibility of the detection results.

[0003] As Figure 1 shown, when measuring the power frequency grounding resistance of a tower pole by the three-electrode method, the voltage electrode P and the current electrode C are respectively arranged at a distance d GC = 4l from the edge of the tower pole foundation and at a distance d GP = 2.5l, where l is the maximum length of the radial grounding electrode of the tower pole grounding device, d GP is the straight-line distance between the grounding device G and the voltage electrode P, and d GC is the straight-line distance between the grounding device G and the current electrode C. At the same time, when burying the voltage electrode and the current electrode, it is necessary to ensure good contact between the terminal and the soil, and reduce the auxiliary grounding resistance of the current electrode by means such as the number of conductors of the current electrode and splashing water on the current electrode.

[0004] In order to improve the contact degree between the terminal and the soil, the general method is to bury the terminal deeper into the soil, which requires the staff to dig the ground and backfill and compact it after putting the terminal in. However, in this way, a certain excavation area is required, the excavation takes a long time, and the wild soil usually contains sundries such as gravel, which further increases the excavation difficulty; and when backfilling, it is difficult to ensure the compaction degree of the soil and the depth of the landfill soil layer. Summary of the Invention

[0005] Aiming at the problems of inconvenient operation of inserting the electrode terminal into the ground and difficult to ensure the soil compaction degree when measuring the grounding resistance of a power transmission tower by the three-electrode method, the utility model provides a grounding detection tool for transmission lines.

[0006] To solve the above problems, the technical solution adopted by the utility model is that a grounding detection tool for transmission lines includes a connecting conductor and a grounding terminal. The grounding terminal is electrically connected to one end of the connecting conductor, and further includes an anchor rod assembly. The anchor rod assembly includes a rod body and a pressing plate. The grounding terminal is installed at the lower end of the rod body. The lower end of the grounding terminal is conical. The connecting conductor passes through the center of the rod body and is connected to the grounding terminal. The pressing plate is located at the upper end of the rod body. The detection tool of this solution has an anchor rod structure. By applying pressure to the pressing plate, the rod body and the grounding terminal at its lower end are inserted into the ground layer. The operation is fast and convenient. At the same time, when inserting, the rod body displaces the soil around, making the soil more compact and in closer contact with the grounding terminal.

[0007] Preferably, the rod body includes a core rod and a sleeve rod. The outer peripheral surface of the core rod is provided with external threads, the inside of the sleeve rod is through and its inner wall is provided with internal threads. The core rod is installed at the lower part of the sleeve rod by threads. The grounding terminal is installed at the lower end of the core rod, and the pressure plate is located at the upper end of the sleeve rod. The rod body is a telescopic structure and can flexibly adjust the insertion depth.

[0008] Preferably, the connecting conductor includes a straight rod section and a wire section. The straight rod section is located inside the core rod. The grounding terminal is located at the lower end of the straight rod section and is an integral structure. One end of the wire section is connected to the upper end of the straight rod section, and the other end of the wire section passes through the sleeve rod and extends to the outside of the rod body. The straight rod section is arranged inside the core rod, which improves the strength of the rod body.

[0009] Preferably, a pulling-out structure is further provided on the anchor rod assembly. It is convenient to pull out this tool from the formation.

[0010] Preferably, the pulling-out structure includes a handle. The handle is U-shaped, and both ends of the handle are hingedly installed on the outer periphery of the pressure plate.

[0011] Preferably, the pulling-out structure includes a pulling rope. One end of the pulling rope is set as a rope sleeve, and the rod body passes through the rope sleeve.

[0012] Preferably, both the rod body and the pressure plate are made of insulating materials.

[0013] Preferably, a scale is provided on the outer peripheral surface of the rod body along the length direction. The insertion depth of the rod body can be accurately set.

[0014] It can be seen from the above technical solutions that the advantages of the present utility model are as follows: This solution provides an anchor rod type detection tool. The grounding terminal is arranged at the lower end of the anchor rod. The whole tool is inserted into the formation without digging pits and backfilling, which improves the operation efficiency. At the same time, during the insertion process, the soil is extruded around, making the soil more compact and in closer contact with the grounding terminal; the rod body adopts a threaded telescopic structure, which can adjust the insertion depth and can achieve length self-locking under axial pressure; through the straight rod section of the connecting conductor, while realizing conduction, the structure of the rod body is strengthened, and the design is ingenious. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the present utility model, the drawings required for description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a wiring schematic diagram for measuring the power frequency grounding resistance of a transmission tower by the three-pole method.

[0017] Figure 2This is a schematic structural diagram of the specific embodiment of the present utility model.

[0018] Figure 3 This is a schematic structural diagram of the core rod in the specific embodiment of the present utility model.

[0019] Figure 4 This is a schematic structural diagram of the pressure plate and the handle in the specific embodiment of the present utility model.

[0020] Main reference numeral description

[0021] 1. Rod body, 1-1. Core rod, 1-2. Sleeve rod, 2. Pressure plate, 3. Grounding terminal, 4. Connecting conductor, 4-1. Straight rod section, 4-2. Wire section, 5. Handle. Specific embodiment

[0022] To make the objectives, features, and advantages of the present utility model more obvious and understandable, the technical solutions in the present utility model will be clearly and completely described below with reference to the accompanying drawings in this specific embodiment. Obviously, the embodiments described below are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in this patent, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this patent.

[0023] As Figures 2 - 4 shown, a grounding detection tool for a transmission line includes an anchor rod assembly, a connecting conductor 4, and a grounding terminal 3. The anchor rod assembly includes a telescopic rod body 1 and a pressure plate 2. Specifically, the rod body 1 includes a core rod 1-1 and a sleeve rod 1-2. The outer peripheral surface of the core rod 1-1 is provided with external threads, and the interior of the sleeve rod 1-2 is through and its inner wall is provided with internal threads. The core rod 1-1 is installed at the lower part of the sleeve rod 1-2 through the cooperation of the internal and external threads. The pressure plate is located at the upper end of the sleeve rod. Both the rod body 1 and the pressure plate 2 are made of insulating materials. A scale is provided on the outer peripheral surface of the rod body 1 along the length direction. Scales can be provided on both the core rod and the sleeve rod, and the sum of the readings of the two sections is the total length of the rod body;

[0024] The core rod is a hollow through structure. The connecting conductor 4 includes a straight rod section 4-1 and a wire section 4-2. The straight rod section 4-1 and the grounding terminal 3 are an integral metal structure. The straight rod section 4-1 is inserted into the inner cavity of the core rod 1-1. The grounding terminal 3 is located at the lower end of the core rod. The straight rod section 4-1 provides a metal core for the anchor rod assembly, improving the overall strength. One end of the wire section 4-2 is electrically connected to the straight rod section 4-2, and the other end passes through the inner cavity of the sleeve rod 1-2 and extends outside the anchor rod assembly to be connected to other circuits to form a detection circuit. The lower end of the grounding terminal 3 is conical to insert into the ground.

[0025] As Figure 4As shown, a pulling-out structure is further provided on the anchor rod assembly. The pulling-out structure includes a handle 5, which is U-shaped. The two ends of the handle are hingedly installed on the outer periphery of the pressure plate 2. When pulling out this detection tool, lift the handle 5, and then lift the anchor rod assembly through the handle 5 to pull out this detection tool. In addition, a rope-pulling structure can also be adopted. One end of the rope is knotted into a noose, the rod body is inserted into the noose, and the noose is stuck at the junction of the rod body and the pressure plate. When pulling out, lift the rope upwards to pull out this detection tool.

[0026] When using this tool, it can be used as a voltage electrode and a current electrode. First, adjust the relative position of the core rod and the sleeve rod, that is, the total length of the rod body, and then insert the rod body into the bottom surface by applying pressure to the pressure plate. During this process, the original soil layer structure is not damaged. At the same time, under the insertion pressure, the surrounding soil is compacted, making contact with the grounding terminal closer. At the same time, it can also make the grounding terminal penetrate deeper into the stratum.

[0027] It can be seen from the above embodiments that the beneficial effects of the present utility model are as follows: This solution provides an anchor rod type detection tool, with the grounding terminal arranged at the lower end of the anchor rod. The whole tool is inserted into the stratum without the need for digging and backfilling, improving the operation efficiency. At the same time, during the insertion process, the surrounding soil is extruded to make the soil more compact and the contact with the grounding terminal closer; the rod body adopts a threaded telescopic structure, which can adjust the insertion depth and can achieve length self-locking under axial pressure; through the straight rod section of the connecting conductor, while realizing conduction, the structure of the rod body is strengthened, and the design is ingenious.

[0028] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A transmission line grounding detection tool, comprising a connecting conductor and a grounding terminal, wherein the grounding terminal is conductively connected to one end of the connecting conductor, characterized in that: It also includes an anchor rod assembly, which includes a rod body and a pressure plate. The grounding terminal is installed at the lower end of the rod body, the lower end of the grounding terminal is conical, the connecting conductor passes through the center of the rod body and is connected to the grounding terminal, and the pressure plate is located at the upper end of the rod body.

2. The power transmission line grounding detection tool according to claim 1, characterized in that: The rod body includes a core rod and a sleeve rod. The outer circumferential surface of the core rod is provided with an external thread, the sleeve rod is penetrated and the inner wall is provided with an internal thread. The core rod is installed at the lower part of the sleeve rod through the thread, the grounding terminal is installed at the lower end of the core rod, and the pressure plate is located at the upper end of the sleeve rod.

3. The power transmission line grounding detection tool according to claim 2, characterized in that: The connecting conductor includes a straight rod section and a wire section. The straight rod section is located inside the core rod. The grounding terminal is located at the lower end of the straight rod section and is an integrated structure. One end of the wire section is connected to the upper end of the straight rod section, and the other end of the wire section passes through the sleeve rod and extends to the outside of the rod body.

4. The power transmission line grounding detection tool according to claim 1, characterized in that: The anchor rod assembly is also provided with a pull-out structure.

5. The power transmission line grounding detection tool according to claim 4, characterized in that: The pull-out structure comprises a handle which is U-shaped and whose two ends are hingedly mounted on the outer periphery of the pressure plate.

6. The power transmission line grounding detection tool according to claim 4, characterized in that: The pulling-out structure comprises a pull rope, one end of which is arranged as a rope loop, and the rod body passes through the rope loop.

7. The power transmission line grounding detection tool according to claim 1, characterized in that: The rod body and the pressure plate are both made of insulating materials.

8. The power transmission line grounding detection tool according to claim 1, characterized in that: The outer peripheral surface of the rod body is provided with a scale along the length direction.

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