Cable broadband impedance spectrum testing device and method based on cable aging time

Abstract

The invention discloses a cable aging time-based cable broadband impedance spectroscopy testing device and method, and the device comprises a host which is provided with a testing cabin at the top; the bottom of the driving seat is in sliding connection with the sliding groove opening in the bottom wall of the testing bin, and the driving seat is driven by the driving module to slide; the test board is fixed at the top of the driving seat; the broadband impedance analysis equipment adopts an annular structure and is fixed on the table top of the test table; the two clamping mechanisms are arranged on the left side and the right side of the broadband impedance analysis equipment respectively, each clamping mechanism is installed on the inner side wall of the testing bin, and the two clamping mechanisms can conduct electric energy introduction while clamping a cable. According to the device, the broadband impedance analysis equipment is utilized to automatically sweep frequency in a set frequency range, complete information of cable impedance characteristics along with frequency change can be captured, and efficient, accurate, lossless and comprehensive cable aging state diagnosis is realized.

Description

Technical Field

[0001] The present invention specifically relates to the technical field of cable performance testing, and in particular to a cable broadband impedance spectrum testing device and method based on cable aging time. Background Art

[0002] Cables widely used in power, communications, transportation and other fields will experience aging phenomena such as insulation degradation and conductor oxidation after long-term service due to factors such as electrothermal stress, mechanical vibration, and environmental erosion (such as moisture and chemical corrosion). Aging cables are prone to short circuits, leakage and even fire, threatening the safe operation of the system and personal safety.

[0003] Most existing cable performance testing equipment has not been specifically optimized for non-destructive clamping, adaptive contact, and stress relief of cable samples. Problems such as inaccurate clamping force control, poor contact stability, and easy damage to samples are common. In addition, the test platform or fixture is usually rigidly connected and cannot effectively absorb the impact force during clamping or compensate for slight bending / installation deviations of the cable, causing the sample to be subjected to additional stress, affecting the authenticity of the test. Summary of the Invention

[0004] To this end, the present invention proposes a cable broadband impedance spectrum testing device and method based on cable aging time to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a cable broadband impedance spectrum testing device based on cable aging time, comprising:

[0006] A main unit, with a test chamber provided on the top;

[0007] The driving seat has its bottom slidably connected to the sliding groove on the bottom wall of the test chamber and is driven by the driving module to slide;

[0008] a test bench, which is fixed on top of the drive seat;

[0009] Broadband impedance analysis equipment, which adopts a ring structure and is fixed on the table of the test bench;

[0010] And there are two clamping mechanisms, which are respectively arranged on the left and right sides of the broadband impedance analysis equipment, and each of the clamping mechanisms is installed on the inner wall of the test chamber. The two clamping mechanisms can clamp the cable while introducing electrical energy.

[0011] Optionally, the clamping mechanism consists of a bracket, an elastic support mechanism, a conductive clamp and an electric cylinder, wherein the bracket is fixed in the test chamber, the elastic support mechanism is installed on the bracket, and the moving part of the elastic support mechanism is driven by the electric cylinder fixed on the back of the bracket, and the conductive clamp is installed on the moving part of the elastic support mechanism.

[0012] Optionally, the conductivity fixture includes:

[0013] a housing in which a sleeve is fixed;

[0014] A plurality of clamping arms are provided and arranged in a circumferential array on the left end surface of the shell, and the right end of each clamping arm is slidably connected to the corresponding guide slot on the left end surface of the shell and fixedly connected to the ear seat located in the shell;

[0015] and a driving ring, which is sleeved on the side wall of the sleeve, and the driving ring is rotatably connected to each ear seat through a pull rod;

[0016] Wherein, a second spring is connected between each ear seat and the side wall of the sleeve.

[0017] Optionally, the drive ring comprises:

[0018] A drive ring slidably mounted on the sleeve;

[0019] an inner ring, which is fixedly connected to the drive ring, and a side wall of the inner ring is provided with a thread;

[0020] The outer ring has an inner wall provided with threads and is threadedly connected to the inner ring;

[0021] And a damping ring is rotatably mounted on the side wall of the right end portion of the shell, and the damping ring and the outer ring are fixed with a connecting ring.

[0022] Optionally, an anti-slip rubber layer is provided on the inner surface of the clamping arm.

[0023] Optionally, an electrically conductive contact piece is provided on the left end surface of the shell, and the electrically conductive contact piece is connected to the power supply device through a conductive wire passing through the sleeve.

[0024] Optionally, the elastic support mechanism includes:

[0025] a base, which is fixed to the bracket;

[0026] A first sliding block is matched and slidably connected to a first sliding rail fixed on the top surface of the base;

[0027] a first slide, which is fixed on the first sliding block, and on which a conductive fixture is installed;

[0028] A second slider is matched and slidably connected to a second slide rail fixed on the top surface of the base, a second slide seat driven by an electric cylinder is fixed on the second slider, and the second slide seat is located to the right of the first slide seat;

[0029] and a telescopic column, wherein two are provided, the left end of each telescopic column being fixedly connected to the first slide, and the right end of each telescopic column being fixedly embedded in the second slide;

[0030] Among them, the right end of each telescopic column can be slidably covered with a baffle, and the baffle is fixedly connected to the second slide seat, and a first spring wrapped around the side wall of the telescopic column is connected between each baffle and the first slide seat.

[0031] Optionally, a flip cover is provided to match and cover the test window of the test chamber, and the flip cover and the test chamber are connected by an oil cylinder.

[0032] The cable broadband impedance spectrum testing method based on cable aging time includes the following steps:

[0033] Step 1: Cut a cable sample of appropriate length, clean the end of the cable sample, remove the sheath and shielding layer, and expose the conductor;

[0034] Step 2: Insert the prepared cable sample into the loop of the broadband impedance analysis equipment, and clamp the two ends of the cable sample with two conductivity clamps respectively, and ensure that the ends of the cable sample are in good contact with the conductivity contacts;

[0035] Step 3: Start the power supply and set the AC excitation voltage to between 0.1V and 5V rms, ensuring it is within the linear response range.

[0036] Step 4: Start the broadband impedance analysis equipment to perform automatic frequency sweep measurement, and record and store the complex impedance (Z), phase angle (θ), real part (R), imaginary part (X), admittance (Y), conductance (G), and susceptance (B) data of each frequency point in real time for analyzing the cable aging time and degree.

[0037] The present invention adopts the above technology and has the following beneficial effects compared with the existing technology:

[0038] The elastic system composed of the first spring, telescopic column, and baffle in the device of the present invention can buffer the initial impact force when the electric cylinder pushes the second slide, and allows the first slide to have a certain elastic displacement in the lateral direction. This enables the two conductive clamps to adapt to slight bending or installation deviations of the cable sample, avoiding excessive rigid stress on the cable, protecting the sample, and ensuring that the conductor and the conductive contact are always in good contact.

[0039] The conductivity clamp uses the threaded connection between the outer ring and the inner ring to twist the damping ring, driving the outer ring to rotate, and under the limiting action of the ear seat and the pull rod, driving the inner ring to approach or move away from the outer ring, thereby driving the driving ring to move left and right, and adjusting the distance between each clamping arm to meet the requirements of clamping the end of the cable sample, so as to achieve efficient, accurate, non-destructive and comprehensive cable aging status diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of the structure of a cable broadband impedance spectrum testing device based on cable aging time;

[0041] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the clamping mechanism;

[0042] Figure 3 for Figure 1 A schematic diagram of the top view of the middle clamping mechanism;

[0043] Figure 4 for Figure 2 Schematic diagram of the internal structure of the medium conductivity fixture.

[0044] In the figure: 1. flip cover; 2. main unit; 3. drive seat; 4. slide slot; 5. broadband impedance analysis equipment; 6. conductivity fixture; 7. first slide; 8. first spring; 9. second slide; 10. telescopic column; 11. electric cylinder; 12. bracket; 13. baffle; 14. base; 15. first slider; 601. clamping arm; 602. conductive contact piece; 603. housing; 604. damping ring; 605. outer ring; 606. pull rod; 607. inner ring; 608. drive ring. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] Example: Please see the attached Figure 1-4 The present invention provides a technical solution: a cable broadband impedance spectrum testing device based on cable aging time, which includes:

[0047] Main unit 2, with a test chamber on top;

[0048] The bottom of the driving seat 3 is slidably connected to the sliding groove 4 on the bottom wall of the test chamber and is driven by the driving module to slide;

[0049] A test bench, which is fixed on the top of the drive seat 3;

[0050] Broadband impedance analysis equipment 5, which adopts a ring structure and is fixed on the table of the test bench;

[0051] and a clamping mechanism, two of which are provided and are respectively arranged on the left and right sides of the broadband impedance analysis device 5, and each clamping mechanism is installed on the inner wall of the test chamber. The two clamping mechanisms can clamp the cable and introduce electrical energy at the same time;

[0052] It should be noted that the drive seat 3 controls the movement of the test bench through the slide groove 4 and the drive module. The test bench drives the broadband impedance analysis equipment to move along the length direction of the cable sample, realizing continuous or fixed-point scanning measurement of the entire cable sample. There is no need to repeatedly disassemble and assemble the sample, which greatly improves the test efficiency.

[0053] In this embodiment, the clamping mechanism consists of a bracket 12, an elastic support mechanism, a conductive clamp 6 and an electric cylinder 11, wherein the bracket 12 is fixed in the test chamber, the elastic support mechanism is installed on the bracket 12, and the moving part of the elastic support mechanism is driven by the electric cylinder 11 fixed on the back of the bracket 12, and the conductive clamp 6 is installed on the moving part of the elastic support mechanism.

[0054] In this embodiment, the conductive fixture 6 includes:

[0055] a housing 603 in which a sleeve is fixed;

[0056] Multiple clamping arms 601 are provided and arranged in a circular array on the left end surface of the housing 603. The right end of each clamping arm 601 slides into a corresponding guide slot on the left end surface of the housing 603 and is fixedly connected to an ear seat located within the housing 603.

[0057] and a driving ring, which is sleeved on the side wall of the sleeve, and the driving ring is rotatably connected to each ear seat through a pull rod 606;

[0058] Wherein, a second spring is connected between each ear seat and the side wall of the sleeve.

[0059] In this embodiment, the driving ring comprises:

[0060] A drive ring 608 slidably mounted on the sleeve;

[0061] An inner ring 607 is fixedly connected to the drive ring 608, and a side wall of the inner ring 607 is provided with threads;

[0062] The outer ring 605 has a threaded inner wall and is threadedly connected to the inner ring 607;

[0063] and a damping ring 604, which is rotatably mounted on the side wall of the right end portion of the housing 603, and the damping ring 604 is fixed to the outer ring 605 by a connecting ring;

[0064] Specifically, through the threaded connection between the outer ring and the inner ring, the damping ring 604 is screwed to drive the outer ring to rotate, and under the limiting action of the ear seat and the pull rod, the inner ring is driven to move closer to or away from the outer ring, thereby driving the driving ring to move left and right, and adjusting the distance between each clamping arm to meet the requirements of clamping the end of the cable sample.

[0065] In this embodiment, the inner surface of the clamping arm 601 is provided with an anti-slip rubber layer.

[0066] In this embodiment, a conductive contact piece 602 is provided on the left end surface of the housing 603 , and the conductive contact piece 602 is connected to the power supply device via a conductive wire passing through the sleeve.

[0067] In this embodiment, the elastic support mechanism includes:

[0068] a base 14 fixed to the bracket 12;

[0069] A first sliding block 15 is slidably connected to a first sliding rail fixed on the top surface of the base 14;

[0070] A first slide 7 is fixed on the first slider 15 and an electrical conductive fixture 6 is mounted on the first slide 7;

[0071] The second slider is slidably connected to the second slide rail fixed on the top surface of the base 14. The second slider is fixed with a second slide 9 driven by the electric cylinder 11, and the second slide 9 is located to the right of the first slide 7.

[0072] and a telescopic column 10, of which two are provided, the left end of each telescopic column 10 is fixedly connected to the first slide 7, and the right end of each telescopic column 10 is fixedly embedded in the second slide 9;

[0073] The right end of each telescopic column 10 can be slidably sleeved with a stop plate 13, and the stop plate 13 is fixedly connected to the second slide 9. A first spring 8 wound around the side wall of the telescopic column 10 is connected between each stop plate 13 and the first slide 7.

[0074] It should be noted that the elastic system composed of the first spring, telescopic column, and resistance plate can buffer the initial impact force when the electric cylinder pushes the second slide, and allow the first slide (with the conductive clamp) to have a certain elastic displacement in the lateral direction (left and right direction). This enables the two conductive clamps to adapt to slight bending or installation deviations of the cable sample, avoiding excessive rigid stress on the cable, protecting the sample, and ensuring that the conductor and the conductive contact are always in good contact.

[0075] In this embodiment, a flip cover 1 is provided to match and cover the test window of the test chamber to provide an electromagnetic shielding environment, reduce external interference, and ensure high-frequency measurement accuracy. The flip cover 1 and the test chamber are connected by an oil cylinder.

[0076] The cable broadband impedance spectrum testing method based on cable aging time includes the following steps:

[0077] Step 1: Cut a cable sample of appropriate length, clean the end of the cable sample, remove the sheath and shielding layer, and expose the conductor;

[0078] Step 2: Insert the prepared cable sample into the loop of the broadband impedance analysis device 5, and clamp the two ends of the cable sample with two conductive clamps 6 respectively, and ensure that the ends of the cable sample are in good contact with the conductive contacts;

[0079] Step 3: Start the power supply and set the AC excitation voltage to between 0.1V and 5V rms, ensuring it is within the linear response range.

[0080] Step 4: Start the broadband impedance analysis device 5 to perform automatic frequency sweep measurement, and record and store the complex impedance (Z), phase angle (θ), real part (R), imaginary part (X), admittance (Y), conductance (G), and susceptance (B) data of each frequency point in real time for analyzing the cable aging time and degree.

[0081] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A cable broadband impedance spectrum testing device based on cable aging time, characterized in that: It includes: A main unit (2) having a test chamber provided on the top; A driving seat (3), the bottom of which is slidably connected to a sliding groove (4) on the bottom wall of the test chamber and is driven by a driving module to slide; A test bench fixed on top of the drive seat (3); A broadband impedance analysis device (5) has a ring structure and is fixed on the table of the test bench; And a clamping mechanism, which is provided with two and is respectively provided on the left and right sides of the broadband impedance analysis device (5), and each of the clamping mechanisms is installed on the inner wall of the test chamber, and the two clamping mechanisms can conduct electric energy introduction while clamping the cable.

2. The cable broadband impedance spectrum testing device based on cable aging time according to claim 1, characterized in that: The clamping mechanism is composed of a bracket (12), an elastic supporting mechanism, an electrically conductive clamp (6), and an electric cylinder (11), wherein the bracket (12) is fixed in a test chamber, the elastic supporting mechanism is installed on the bracket (12), and the movable part of the elastic supporting mechanism is driven by the electric cylinder (11) fixed on the back of the bracket (12), and the electrically conductive clamp (6) is installed on the movable part of the elastic supporting mechanism.

3. The cable broadband impedance spectrum testing device based on cable aging time according to claim 2, characterized in that: The conductive fixture (6) comprises: a housing (603) in which a sleeve is fixed; A plurality of clamping arms (601) are provided and arranged in a circular array on the left end surface of the shell (603), and the right end of each clamping arm (601) is slidably connected to a corresponding guide slot on the left end surface of the shell (603) and fixedly connected to an ear seat located in the shell (603); and a driving ring, which is sleeved on the side wall of the sleeve, and the driving ring is rotatably connected to each ear seat via a pull rod (606); Wherein, a second spring is connected between each ear seat and the side wall of the sleeve.

4. The cable broadband impedance spectrum testing device based on cable aging time according to claim 3, characterized in that: The drive ring comprises: A drive ring (608) slidably mounted on the sleeve; an inner ring (607) fixedly connected to the drive ring (608), wherein the side wall of the inner ring (607) is provided with a thread; The outer ring (605) has an inner wall provided with threads and is threadedly connected to the inner ring (607); And a damping ring (604) is rotatably mounted on the side wall of the right end portion of the housing (603), and the damping ring (604) and the outer ring (605) are fixed with a connecting ring.

5. The cable broadband impedance spectrum testing device based on cable aging time according to claim 3, characterized in that: The inner surface of the clamping arm (601) is provided with an anti-slip rubber layer.

6. The cable broadband impedance spectrum testing device based on cable aging time according to claim 4, characterized in that: An electrical contact piece (602) is provided on the left end surface of the housing (603), and the electrical contact piece (602) is connected to the power supply equipment via a conductive wire inserted into the sleeve.

7. The cable broadband impedance spectrum testing device based on cable aging time according to claim 2, characterized in that: The elastic support mechanism comprises: A base (14) fixed to the bracket (12); A first sliding block (15) is matched and slidably connected to a first sliding rail fixed on the top surface of the base (14); A first slide (7) is fixed on the first slider (15), and a conductive clamp (6) is installed on the first slide (7); A second slider is matched and slidably connected to a second slide rail fixed on the top surface of the base (14); a second slide seat (9) driven by an electric cylinder (11) is fixed on the second slider, and the second slide seat (9) is located to the right of the first slide seat (7); and a telescopic column (10), wherein two telescopic columns (10) are provided, the left end of each telescopic column (10) is fixedly connected to the first slide seat (7), and the right end of each telescopic column (10) is fixedly embedded in the second slide seat (9); The right end of each telescopic column (10) can be slidably sleeved with a blocking plate (13), and the blocking plate (13) is fixedly connected to the second slide seat (9), and a first spring (8) wound around the side wall of the telescopic column (10) is connected between each blocking plate (13) and the first slide seat (7).

8. The cable broadband impedance spectrum testing device based on cable aging time according to claim 1, characterized in that: A flip cover (1) is provided to match and cover the test window of the test chamber, and the flip cover (1) and the test chamber are connected by an oil cylinder.

9. A cable broadband impedance spectrum testing method based on cable aging time, characterized in that: It includes the following steps: Step 1: Cut a cable sample of appropriate length, clean the end of the cable sample, remove the sheath and shielding layer, and expose the conductor; Step 2: Insert the prepared cable sample into the ring of the broadband impedance analysis device (5), and clamp the two ends of the cable sample with two conductive clamps (6) respectively, and ensure that the ends of the cable sample are in good contact with the conductive contact piece; Step 3: Start the power supply and set the AC excitation voltage to between 0.1V and 5V rms, ensuring it is within the linear response range. Step 4: Start the broadband impedance analysis equipment (5) to perform automatic frequency sweep measurement, and record and store the complex impedance (Z), phase angle (θ), real part (R), imaginary part (X), admittance (Y), conductance (G), and susceptance (B) data of each frequency point in real time for analyzing the cable aging time and degree.

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