Flexible convenient conductor resistance measuring tool

Abstract

The utility model discloses a flexible convenient conductor resistance measuring tool, which comprises a measuring auxiliary belt made of a flexible inelastic material, two potential electrode positions are arranged on the measuring auxiliary belt at intervals, a current electrode position is arranged on the outer side of each potential electrode position, a certain distance is formed between the current electrode position and the corresponding potential electrode position, and the current electrode position is arranged on the outer side of the measuring auxiliary belt. The two potential electrode positions and the two current electrode positions are respectively provided with a detachable electrode fixing band which can be tightly attached to the cross section of a measured conductor, and one end of each electrode fixing band is connected with the corresponding electrode position during measurement. The electrode fixing band is arranged to replace a clamp in the prior art, the flexibility is high, the contact area between the electrode fixing band and a metal conductor is larger, a stable current equalizing surface is conveniently formed on the surface of the conductor and in the conductor, and therefore the testing precision is improved; the position of the electrode fixing band is positioned in an auxiliary mode through the measurement auxiliary band, conductor straightening is not needed, measurement is convenient, and meanwhile the test length is more accurate.

Description

Technical Field

[0001] This utility model belongs to the field of conductor resistance testing technology for wires and cables, and specifically relates to a flexible and convenient conductor resistance measuring tool. Background Technology

[0002] Conductor resistance testing is an important test for evaluating the cross-sectional area of ​​cable conductors and the current-carrying capacity of conductor materials. It typically uses a Kelvin bridge (also known as a double-arm bridge). The cable conductor is placed in the four electrode clamps of the bridge, with the two middle potential electrodes spaced 1 meter apart, and two current electrodes at each end. Voltage and current are applied to the conductor using testing instruments to calculate the conductor resistance value. If the cable conductor resistance is high, the sample will generate excessive heat during use, potentially causing cracking and melting of the insulation and sheathing materials, easily leading to short circuits, fires, and other hazards, posing a significant safety risk.

[0003] Conductor resistance testing requires removing all insulation and sheathing materials from the outer layer of the cable's metallic conductor. After straightening the conductor, it is placed in the four electrodes of a traditional double-arm bridge clamp, and then the conductor resistance value is measured using testing instruments. Traditional bridge clamps, with an aluminum alloy base and brass electrodes, have several problems: 1. The clamp base is at least 1.5 meters long, making the entire clamp heavy and inconvenient to carry. 2. The four electrode clamp ends are controlled by a circular knob via a lead screw, and the clamp consists of two serrated brass blades. There are only four contact points between the serrated blades and the round or shaped conductor sample. When testing cable conductors with large cross-sectional areas, this leads to uneven current distribution on the conductor surface and inside the conductor, preventing the formation of a uniform current surface and introducing testing errors. When testing flexible conductor cables with small cross-sectional areas, it can easily cause the copper wires in the sample to break. Third, the cable sample needs to be straightened before testing, and excessive force should not be applied during the cable stretching process, as this can easily lead to the conductor being stretched thin and the resistance value being too high. Therefore, it is usually impossible to guarantee the absolute straightness of the sample. Consequently, the actual length between the two potential electrodes cannot be accurately measured during the test, resulting in deviations in the resistance measurement. Utility Model Content

[0004] This utility model proposes a flexible and convenient conductor resistance measuring fixture, which solves the problem of traditional fixture bases being heavy and difficult to carry. It increases the contact area between the electrode plates and the circular and shaped conductors, improving the testing accuracy. At the same time, it eliminates the need for conductor straightening, making the test length between the two potential electrodes more accurate and the testing process more convenient.

[0005] Therefore, the technical solution adopted by this utility model is as follows: a flexible and convenient conductor resistance measuring fixture, including a measuring auxiliary strip made of flexible non-elastic material, on which two potential electrode positions are arranged at intervals, and the straight-line distance between the two potential electrode positions is 1m. On the outside of each potential electrode position, a current electrode position is arranged at a certain distance from the corresponding potential electrode position, and the distance between each current electrode position and the corresponding potential electrode position is equal. Each of the two potential electrode positions and the two current electrode positions is equipped with a detachable electrode fixing strip that can be tightly fitted to the cross-section of the conductor being measured, and during measurement, one end of the electrode fixing strip is connected to the corresponding electrode position.

[0006] As a preferred embodiment of the above scheme, the potential electrode position and the current electrode position have the same structure, both including an electrode sheet that is closely attached to the measurement auxiliary strip and an electrode post connected to the electrode sheet. The electrode post is disposed on the side of the electrode sheet and is used to connect to the electrode fixing strip.

[0007] Further preferably, the electrode sheet and electrode fixing band are made of copper-silver multi-element alloy, and the electrode post is made of pure brass.

[0008] Further preferably, the electrode fixing strap is configured as a slipknot cable tie.

[0009] Further preferably, the measuring auxiliary belt is made of non-elastic ropes such as nylon rope, reinforced rope, or metal rope.

[0010] Further preferably, the side of the measuring auxiliary tape that is in contact with the cable is provided with an adhesive layer to facilitate fixing the measuring auxiliary tape to the surface of the cable.

[0011] Further preferably, the measuring auxiliary belt is provided with scale lines that are at least 1m long and have an accuracy of no more than 1mm.

[0012] The beneficial effects of this invention are as follows: During measurement, the measuring auxiliary tape is aligned with the axis of the conductor surface along the direction of extension and bending of the conductor under test. Then, the non-metallic material of the outer layer of the cable corresponding to the electrode position is removed. Next, the electrode fixing tape is placed on the metal conductor, ensuring close contact between the electrode fixing tape and the cross-section of the metal conductor. Simultaneously, one end of the electrode fixing tape is connected to the corresponding electrode position. Finally, the conductor resistance is tested. By replacing the clamps in the prior art with the electrode fixing tape, it not only has higher flexibility but also a larger contact surface with the metal conductor, facilitating the formation of a stable current-equalizing surface on and inside the conductor, thereby improving test accuracy. The measuring auxiliary tape helps to position the electrode fixing tape, eliminating the need for conductor straightening, which not only facilitates measurement but also makes the test length more accurate. Attached Figure Description

[0013] Figure 1This is a perspective view of the present invention fixed on the cable to be tested.

[0014] Figure 2 This is a side view of the present invention fixed on the cable to be tested.

[0015] Figure 3 This is a schematic diagram of the measuring auxiliary belt in this utility model.

[0016] Figure 4 This is a schematic diagram of the electrode fixing band in this utility model.

[0017] Figure reference numerals: Electrode plate-a, Electrode post-b, Measurement auxiliary strip-1, Potential electrode position-2, Current electrode position-3, Electrode fixing strip-4, Cable under test-5, Metal conductor-6. Detailed Implementation

[0018] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0019] like Figure 1-4 As shown, a flexible and convenient conductor resistance measuring fixture mainly consists of a measuring auxiliary strip 1, potential electrode positions 2, current electrode positions 3, and an electrode fixing strip 4. The measuring auxiliary strip 1 is made of a flexible, non-elastic material with a length greater than 1m, and the non-elastic material can be nylon rope, reinforced rope, metal rope, or other non-elastic ropes. To facilitate accurate tracking of cable extension and bending changes by the measuring auxiliary strip 1, an adhesive layer is provided on the side of the measuring auxiliary strip 1 that contacts the cable to facilitate fixing the measuring auxiliary strip to the cable surface. Preferably, the measuring auxiliary strip 1 has graduation lines with a length of at least 1m and an accuracy of no more than 1mm.

[0020] Two potential electrode positions 2 are set at intervals on the measurement auxiliary strip 1, and the straight-line distance between the two potential electrode positions 2 is 1m. On the outside of each potential electrode position 2, there is a current electrode position 3 that is set at a certain distance from the corresponding potential electrode position 2, and the distance between each current electrode position 3 and the corresponding potential electrode position 2 is equal. Each of the two potential electrode positions 2 and the two current electrode positions 3 is equipped with a detachable electrode fixing strip 4 that can fit tightly with the cross section of the conductor being measured, and during measurement, one end of the electrode fixing strip 4 is connected to the corresponding electrode position.

[0021] Specifically, the potential electrode position 2 and the current electrode position 3 have the same structure, both including an electrode piece a that is closely attached to the measurement auxiliary strip 1 and an electrode post b that is connected to the electrode piece a. The electrode post b is located on the side of the electrode piece a, and the other end of the electrode post b is used to connect to the electrode fixing strip 4.

[0022] Ideally, the electrode sheet 4 and the electrode fixing band 4 should be made of copper-silver multi-element alloy, and the electrode post b should be made of pure brass.

[0023] To facilitate fixing the electrode fixing band to the metal conductor, the electrode fixing band 4 is set as a snap-on cable tie, specifically, one end is made into a snap-on cable tie, the other end is made into a flat rectangular piece, and the other end is provided with a connection hole that can be fitted onto the electrode post.

[0024] During measurement, the measuring auxiliary tape is aligned with the axis of the conductor surface along the direction of extension and bending of the conductor under test. Then, the non-metallic material of the outer layer of the cable corresponding to the electrode position is removed. Next, the electrode fixing tape is placed on the metal conductor, ensuring close contact between the electrode fixing tape and the cross-section of the metal conductor. At the same time, one end of the electrode fixing tape is connected to the corresponding electrode position. Finally, the conductor resistance is tested.

Claims

1. A flexible and convenient conductor resistance measuring fixture, characterized in that: The measurement auxiliary strip (1) is made of a flexible non-elastic material. Two potential electrode positions (2) are arranged at intervals on the measurement auxiliary strip (1), and the straight distance between the two potential electrode positions (2) is 1m. A current electrode position (3) is arranged on the outside of each potential electrode position (2) at a certain distance from the corresponding potential electrode position (2), and the distance between each current electrode position (3) and the corresponding potential electrode position (2) is equal. A detachable electrode fixing strip (4) is provided at each of the two potential electrode positions (2) and the two current electrode positions (3) so as to fit tightly with the cross section of the conductor being measured. During measurement, one end of the electrode fixing strip (4) is connected to the corresponding electrode position.

2. The flexible and portable conductor resistance measuring fixture according to claim 1, characterized in that: The potential electrode position (2) and the current electrode position (3) have the same structure, both including an electrode sheet (a) that is attached to the measurement auxiliary strip (1) and an electrode post (b) connected to the electrode sheet (a). The electrode post (b) is located on the side of the electrode sheet (a) and is used to connect to the electrode fixing strip (4).

3. The flexible and portable conductor resistance measuring fixture according to claim 2, characterized in that: The electrode sheet (a) and electrode fixing band (4) are made of copper-silver multi-element alloy, and the electrode post (b) is made of pure brass.

4. The flexible and portable conductor resistance measuring fixture according to claim 1, characterized in that: The electrode fixing strap (4) is set as a slipknot cable tie.

5. The flexible and portable conductor resistance measuring fixture according to claim 1, characterized in that: The measuring auxiliary belt (1) is made of nylon rope, reinforced rope, or metal rope.

6. The flexible and portable conductor resistance measuring fixture according to claim 1, characterized in that: The measuring auxiliary tape (1) has an adhesive layer on the side that is in contact with the cable, which facilitates fixing the measuring auxiliary tape to the surface of the cable.

7. The flexible and portable conductor resistance measuring fixture according to claim 1, characterized in that: The measuring auxiliary belt (1) is provided with scale lines with a length of at least 1m and an accuracy of no more than 1mm.

Images