Test clamp for cable insulativity detection

Abstract

A test clamp for cable insulativity detection is characterized in that an upper clamp body and a lower clamp body which are rotatably hinged are arranged, a conductive contact seat and a probe which is conductively connected with the conductive contact seat are arranged in the lower clamp body, the rear end of the conductive contact seat is connected with a connecting wire, and the lower end part of the probe is provided with a movable shifting assembly; the shifting assembly comprises a shifting block, a compression spring and a guide sleeve fixedly arranged on the lower wall of the lower clamp body, the shifting block is fixedly arranged at the rear end of the probe, and the compression spring is connected between the guide sleeve and the shifting block. The shifting block downwards penetrates through the lower clamp body, the front end of the probe penetrates through the guide sleeve and synchronously moves back and forth along with the shifting block under the action of external force to extend out of the lower clamp body or retract into the lower clamp body, meter wires do not need to be replaced in the testing process, detection can be continued only by pushing the probe out of the testing clamp, time is greatly saved, field operation is simpler and more convenient, and the testing efficiency is improved. And the electric shock risk is small, the plugging reliability is high, the structure is simple, and the use is convenient.

Description

Technical Field

[0001] This utility model belongs to the field of cable testing technology, and specifically relates to a test clip for testing cable insulation. Background Technology

[0002] The insulation performance of a cable refers to its ability to prevent leakage, discharge, and isolation of electrical energy by wrapping it with certain materials. Cable insulation testing is divided into two categories: (1) insulation to ground and (2) phase-to-phase insulation. Among them, insulation to ground testing refers to the process of measuring the insulation resistance between the cable and the ground (or the casing of a non-energized device); phase-to-phase insulation testing refers to the process of measuring the insulation resistance between the cable cores. Due to the large number of cables and the complex wiring methods, the insulation testing process takes a certain amount of time, which in turn affects the construction progress. Therefore, this step has a crucial impact on whether power substation renovation and expansion projects, technical improvement projects, and maintenance projects can be successfully powered.

[0003] Currently, the cable insulation testing process mainly includes power-off measurement and tool replacement steps, among which the tool replacement step has the following characteristics:

[0004] (1) Replace the meter wire. First, perform a ground insulation test on the cable. The ground insulation test requires a meter wire with a test clip. After the ground insulation test is completed, perform a phase-to-phase insulation test. The phase-to-phase insulation test requires a meter wire with a probe. That is, the meter wire with the test clip needs to be replaced with a meter wire with a probe. The time taken by this step directly affects the time taken by the entire test process.

[0005] (2) Replace the meter needle. For each measurement of the insulation of a single cable core, the meter needle must be switched to a different terminal, i.e., the meter needle must be replaced.

[0006] In cable insulation testing, two common methods are used: replacing the entire test cable or only replacing the test clip. Investigations revealed differences between these two methods in terms of cost, number of personnel required, insertion speed, and reliability. Replacing the test clip is simpler, requiring only a probe to replace the clip; it's fast and the parts are lightweight. However, the probes are small and inconvenient to handle, posing a higher risk of electric shock, and the insertion reliability is lower. Replacing the entire test cable requires preparing a cable compatible with the instrument's connector beforehand; the replacement speed is slower, the risk of electric shock is lower, and the insertion reliability is higher.

[0007] Therefore, the design of the test clips in the existing testing instruments is unreasonable, which leads to long time for changing the meter leads. In turn, the long time for changing the meter leads leads to long testing time. Therefore, it is necessary to improve the structure of the existing test clips. Summary of the Invention

[0008] The purpose of this invention is to address the shortcomings of the existing technology by providing a test clamp for cable insulation testing, which improves operability and saves testing time.

[0009] To solve the above technical problems, the technical solution adopted by this utility model is as follows:

[0010] A test clamp for cable insulation testing includes an upper clamp body and a lower clamp body that are rotatably hinged. The lower clamp body is provided with a conductive contact seat and a probe that is conductively connected thereto. A connecting wire is connected to the rear end of the conductive contact seat, and a movable toggle component is provided at the lower end of the probe.

[0011] The actuating assembly includes an actuating block, a compression spring, and a guide sleeve fixed to the lower wall of the lower clamp. The actuating block is fixed to the rear end of the probe, and the compression spring is connected between the guide sleeve and the actuating block.

[0012] The actuating block penetrates downward through the lower clamping body, while the probe tip passes through the guide sleeve and moves synchronously back and forth with the actuating block under the action of external force, extending out of the lower clamping body or retracting into the lower clamping body.

[0013] The bottom of the lower clamp is provided with a guide slot, the bottom of the toggle block extends out of the guide slot and is hinged with a positioning plate, and both ends of the guide slot are also fixed with limiting plates to limit the movement of the probe.

[0014] The upper clamp and the lower clamp are hinged by a pin, and the upper clamp has a first fixing cavity and the lower clamp has a second fixing cavity.

[0015] A torsion spring is sleeved on the outside of the pin. One end of the torsion spring extends into the first fixed cavity and abuts against the inner wall of the first fixed cavity, while the other end of the torsion spring extends into the second fixed cavity and abuts against the inner wall of the second fixed cavity.

[0016] The lower clamp has a through hole at its front end for the probe to pass through.

[0017] The positioning plate is designed as an L-shaped plate.

[0018] The actuating block, positioning plate, and limiting plate are all made of insulating material.

[0019] The front ends of the upper and lower clamps are also provided with clamping openings.

[0020] Both the upper and lower clamps are covered with insulating sleeves.

[0021] The guide slot is designed as a rectangular slot.

[0022] The conductive contact base is made of copper.

[0023] The beneficial effects of this utility model are:

[0024] This cable insulation testing clamp features a rotating hinged upper and lower clamp body. The lower clamp body houses a conductive contact seat and a probe electrically connected to it. A connecting wire is attached to the rear end of the conductive contact seat, and a movable actuating component is located at the lower end of the probe. The actuating component includes an actuating block, a compression spring, and a guide sleeve fixed to the lower wall of the lower clamp body. The actuating block is fixed to the rear end of the probe, and the compression spring is connected between the guide sleeve and the actuating block. The actuating block penetrates downward through the lower clamp body, while the probe tip passes through the guide sleeve and moves synchronously back and forth with the actuating block under external force, extending out of or retracting into the lower clamp body. During testing, there is no need to replace the test leads; simply pushing the probe out of the test clamp allows for continued testing, significantly saving time, simplifying on-site operation, reducing the risk of electric shock, ensuring high connection reliability, and providing a simple and convenient structure. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a partial schematic diagram of the toggle component;

[0027] Figure 3 This is a schematic diagram of the external structure of the upper and lower clamps;

[0028] Figure 4 This is a state diagram of the cable insulation to ground tested according to this utility model;

[0029] Figure 5 This is a state diagram of the cable phase-to-phase insulation test according to this utility model;

[0030] Figure 6 yes Figure 5 A magnified view of a portion of the image. Detailed Implementation

[0031] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0032] Please see Figure 1It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0033] This utility model provides a test clip for cable insulation testing, such as... Figures 1 to 6 As shown.

[0034] A test clamp for cable insulation testing includes an upper clamp body 1 and a lower clamp body 2 that are rotatably hinged. The lower clamp body 2 is provided with a conductive contact seat 8 and a probe 4 that is conductively connected to it. A connecting wire 3 is connected to the rear end of the conductive contact seat 8. A movable actuating component 5 is provided at the lower end of the probe 4. The actuating component 5 includes an actuating block 10, a compression spring 13, and a guide sleeve 12 fixed on the lower wall of the lower clamp body. The actuating block 10 is fixed at the rear end of the probe 4, and the compression spring 13 is connected between the guide sleeve 12 and the actuating block 10.

[0035] The actuating block 10 penetrates downward through the lower clamping body 2, while the front end of the probe 4 passes through the guide sleeve 12 and moves back and forth synchronously with the actuating block 10 under the action of external force, extending out of the lower clamping body 2 or retracting into the lower clamping body 2.

[0036] The bottom of the lower clamp 2 is provided with a guide slot 9, the bottom of the toggle block extends out of the guide slot 9 and is hinged with a positioning plate 14, and both ends of the guide slot 9 are respectively fixed with limiting plates 11 to limit the movement of the probe 4.

[0037] The lower clamp 2 is provided with a conductive contact seat 8 inside, and the conductive contact seat 8 is made of copper. The connecting wire 3 passes through the lower clamp 2 from the rear end and is electrically connected to the copper contact seat. The probe 4 is set in the lower clamp 2 and is located below the front end of the copper contact seat, and the rear end of the probe 4 abuts against the copper contact seat. In addition, the front end of the lower clamp 2 is provided with a through hole for the probe 4 to pass through, and the bottom of the lower clamp 2 is provided with a guide groove 9.

[0038] The actuating component 5 is located at the bottom of the lower clamping body 2 and is used to drive the probe 4 to move back and forth. In this embodiment, the actuating component 5 includes an actuating block 10, two limiting plates 11, a guide sleeve 12, and a compression spring 13. The actuating block 10 is fixed below the rear end of the probe 4, and the bottom of the actuating block 10 extends through the guide slot 9 and is hinged to a positioning plate 14. The two limiting plates 11 are both fixed below the lower clamping body 2 and are respectively located at the front and rear ends of the guide slot 9. The guide sleeve 12 and the compression spring 13 are both located in the lower clamping body 2, and the front end of the probe 4 passes through the guide sleeve 12. The guide sleeve 12 is used to provide guidance for the back and forth movement of the probe 4, and the compression spring 13 is connected between the guide sleeve 12 and the actuating block 10.

[0039] The upper clamp and the lower clamp 2 are hinged by a pin. The rear end of the upper clamp 1 is provided with a first fixed cavity 6, and the rear end of the lower clamp 2 is provided with a second fixed cavity 7. A torsion spring 16 is sleeved on the outside of the pin. One end of the torsion spring 16 extends into the first fixed cavity 6 and abuts against the inner wall of the first fixed cavity 6. The other end of the torsion spring 16 extends into the second fixed cavity 7 and abuts against the inner wall of the second fixed cavity 7.

[0040] In addition, the actuating block 10, the positioning plate 14, and the two limiting plates 11 are all made of insulating materials, such as PTFE, PPS, and other insulating plastics. The upper clamp 1 and the lower clamp 2 have clamping openings at their front ends. Except for the clamping openings, the upper clamp 1 and the lower clamp 2 are covered with insulating sleeves. The rear end of the lower clamp 2 is also provided with a wire protection sleeve 15, which is used to protect the connecting wire 3 and reduce bending of the connecting wire 3.

[0041] The working principle is as follows:

[0042] When using it, first perform a ground insulation test. Connect the connecting wire 3 to the corresponding socket of the test instrument, ground one test clip, and clamp the other test clip on the cable core. When the clamping port is clamped on the cable, the probe 4 inside will not contact the core. Then perform a ground insulation test.

[0043] After the ground insulation test is completed, the phase-to-phase insulation test is performed. No replacement of the meter wires is required; simply push out probes 4 of the two test clips to conduct the test. The specific operating steps are as follows:

[0044] Manually push the toggle block 10 forward, and the toggle block 10 will simultaneously drive the probe 4 forward. The guide sleeve 12 can provide guidance for the forward movement of the probe 4. When the toggle block 10 is pushed to the position of the front limiting plate 11, the rear end of the probe 4 can still make contact with the copper contact seat and conduct electricity. At this time, rotate the positioning plate 14 of the L-shaped plate upward and hook it onto the bottom end of the front limiting plate 11. Under the action of the reverse elastic force of the compression spring 13, the positioning plate 14 can be firmly hooked onto the limiting plate 11.

[0045] To improve friction and stability, anti-slip protrusions are provided on the contact surface between the positioning plate 14 and the limiting plate 11. Then, phase-to-phase insulation testing is performed. After the test, the positioning plate 14 is released, and the toggle block 10 resets under the elastic force of the compression spring 13, while the probe 4 is stored in the lower clamp 2.

[0046] If this patent uses terms such as "first" and "second" to define components, those skilled in the art should know that the use of "first" and "second" is merely for the convenience of describing this utility model and simplifying the description, and the above terms have no special meaning.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A test clamp for cable insulation testing, comprising an upper clamp body and a lower clamp body that are rotatably hinged, characterized in that: The lower clamp is provided with a conductive contact seat and a probe electrically connected thereto. The rear end of the conductive contact seat is connected to a connecting wire, and the lower end of the probe is provided with a movable toggle component. The actuating assembly includes an actuating block, a compression spring, and a guide sleeve fixed to the lower wall of the lower clamp. The actuating block is fixed to the rear end of the probe, and the compression spring is connected between the guide sleeve and the actuating block. The actuating block penetrates downward through the lower clamping body, while the probe tip passes through the guide sleeve and moves synchronously back and forth with the actuating block under the action of external force, extending out of the lower clamping body or retracting into the lower clamping body.

2. The test clamp for cable insulation testing according to claim 1, characterized in that: The bottom of the lower clamp is provided with a guide slot, the bottom of the toggle block extends out of the guide slot and is hinged with a positioning plate, and both ends of the guide slot are also fixed with limiting plates to limit the movement of the probe.

3. The test clamp for cable insulation testing according to claim 1, characterized in that: The upper clamp and the lower clamp are hinged by a pin, and the upper clamp has a first fixing cavity and the lower clamp has a second fixing cavity. A torsion spring is sleeved on the outside of the pin. One end of the torsion spring extends into the first fixed cavity and abuts against the inner wall of the first fixed cavity, while the other end of the torsion spring extends into the second fixed cavity and abuts against the inner wall of the second fixed cavity.

4. The test clamp for cable insulation testing according to claim 1, characterized in that: The lower clamp has a through hole at its front end for the probe to pass through.

5. A test clamp for cable insulation testing according to claim 2, characterized in that: The positioning plate is designed as an L-shaped plate.

6. A test clamp for cable insulation testing according to claim 2, characterized in that: The actuating block, positioning plate, and limiting plate are all made of insulating material.

7. A test clamp for cable insulation testing according to any one of claims 1 to 6, characterized in that: The front ends of the upper and lower clamps are also provided with clamping openings.

8. A test clamp for cable insulation testing according to claim 7, characterized in that: Both the upper and lower clamps are covered with insulating sleeves.

9. A test clamp for cable insulation testing according to claim 2, characterized in that: The guide slot is designed as a rectangular slot.

10. A test clamp for cable insulation testing according to claim 7, characterized in that: The conductive contact base is made of copper.

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