Power cable conductor shielding volume resistivity testing device
By using copper sheet molds to form electrodes, the problem of low efficiency of manually coated silver electrodes in the volume resistivity test of power cable conductor shields was solved, achieving efficient and stable test results and improved safety.
Patent Information
- Application Number
- CN202520150817.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-01-22
AI Technical Summary
In existing power cable conductor shield volume resistivity testing, manually applying conductive silver paint to form electrodes is inefficient, has a long curing time, and its unevenness leads to large errors in test data.
Electrodes are formed using copper sheet molds. A testing device consisting of a fixing frame, a lifting pressure plate, a conductive electrode fixing device, and copper sheet molds ensures the consistency of electrode spacing and width, avoiding the use of conductive silver paint.
It improves testing efficiency, saves costs, reduces experimental errors, improves environmental and personal safety, and makes data more stable.
Smart Images
Figure CN223870743U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of cable detection, especially relates to a power cable conductor shielding volume resistivity testing device. BACKGROUND
[0002] The power cable shielding volume resistivity test includes conductor shielding and insulation shielding, according to the relevant standards of power cable, for example, the standard in GB / T 12706.2-2020, the conductor shielding volume resistivity test method is prepared from a finished cable sample, the cable insulation core sample is cut in half along the longitudinal direction, the conductor is removed to prepare the conductor shielding sample, if there is an isolation layer, it should also be removed, then four silver-coated electrodes are coated on the surface of the semi-conductive layer to form four electrodes A, B, C and D, the distance between two potential electrodes B and C is 50mm, and the distance between two current electrodes A and D is at least 25mm on the outside of the potential electrode. At present, the conductor shielding still adopts the manual conductive silver paint coating method to form the electrode, the silver electrode curing time is long at normal temperature, the working efficiency is low, and it is difficult to ensure uniformity, leading to the increase of test data error.
[0003] In order to improve the working efficiency and improve the stability of data, the inventor of the present application has designed a power cable conductor shielding volume resistivity testing device, and thus the present case is generated. CONTENT OF THE UTILITY MODEL
[0004] The utility model aims at providing a kind of power cable conductor shielding volume resistivity testing device to improve detection efficiency and the stability of detection data.
[0005] In order to achieve the above-mentioned purpose, the solution of the utility model is as follows:
[0006] A kind of power cable conductor shielding volume resistivity testing device, is composed of fixed frame, lifting pressure plate, conductive electrode fixing device and copper sheet mould;
[0007] The fixed frame includes four support columns, which are connected to the upper base and the lower base;
[0008] The lifting pressure plate is located between the upper base and the lower base, and includes a rotating handle for lifting, which is installed on the upper base. The rotating handle is connected to the lifting pressure plate through a rotating shaft, and drives the lifting pressure plate to move up and down through the rotating shaft. The lifting pressure plate also includes a semicircular fixed insulating plate, which is fixed to the bottom of the lifting pressure plate;
[0009] The conductive electrode fixing device has an electrode insulation plate, two potential electrode cylinders and two current electrode cylinders, the electrode insulation plate is installed on the lower base, the two potential electrode cylinders and the two current electrode cylinders are fixed on the electrode insulation plate, the potential electrode cylinders and the current electrode cylinders are opposite to the semicircular fixed insulation plates of the lifting pressure plates, the potential electrode cylinders and the current electrode cylinders are provided with insertion slots, and the potential electrode cylinders and the current electrode cylinders are arranged at standard intervals.
[0010] The copper sheet mold is provided with two potential electrode copper sheets and two current electrode copper sheets, the potential electrode copper sheets and the current electrode copper sheets are respectively placed on the insertion slots of the corresponding two potential electrode cylinders and two current electrode cylinders, the copper sheet mold is used for being connected with the inner surface of the conductor shielding test piece and is also connected with the corresponding current electrode cylinders and potential electrode cylinders to form electrodes.
[0011] The lower end of the semicircular fixed insulation plate is provided with a V-shaped positioning slot, and the bottom of the V-shaped positioning slot is in a semicircular shape.
[0012] The semicircular fixed insulation plate has four groups, which are located above the two potential electrode cylinders and the two current electrode cylinders.
[0013] Each group of the semicircular fixed insulation plate has two parallel plates.
[0014] The lifting pressure plate is provided with a guide hole corresponding to the four supporting columns, and the four supporting columns are inserted into the guide hole, so that the lifting pressure plate is lifted up and down along the four supporting columns.
[0015] After the above scheme is adopted, compared with the traditional manual silver electrode coating, the beneficial effects of the utility model are as follows:
[0016] I. The copper sheet mold is used to form the electrode, without using conductive silver paint, saving the manual conductive silver paint coating and the curing time of the silver electrode at room temperature, and improving the detection efficiency;
[0017] II. The use of conductive silver paint is also saved, and the cost is saved;
[0018] III. The copper sheet mold ensures the interval and width during each measurement, compared with the unevenness of the manual silver electrode coating, the test error is reduced, and the data is more stable;
[0019] IV. The conductive silver paint with certain safety hazards is omitted, and the environment and personal safety are also improved.
[0020] The utility model will be further described below in combination with the drawings and examples. DRAWINGS
[0021] Figure 1 is a structural schematic view of the utility model except the copper sheet mold;
[0022] Figure 2 is a front view of Figure 1 ;
[0023] Figure 3 is a side view of Figure 1 ;
[0024] Figure 4 is a partial enlarged view of the semicircular fixed insulating plate;
[0025] Figure 5 is a schematic structural diagram of a copper sheet mold of the utility model;
[0026] Figure 6 is a three-dimensional schematic diagram of the utility model test;
[0027] Figure 7 is a front view of the utility model test.
[0028] Label explanation
[0029] 1 - lifting pressure plate, 11 - rotating handle, 12 - semicircular fixed insulating plate, 121 - V-shaped positioning slot, 122 - semicircular type, 13 - rotating shaft, 14 - guide hole;
[0030] 2 - conductive electrode fixing device, 21 - current electrode cylinder, 22 - potential electrode cylinder, 23 - electrode insulating plate;
[0031] 3 - fixed frame, 31 - upper base, 32 - support column, 33 - lower base;
[0032] 4 - copper sheet mold, 41 - current electrode copper sheet, 42 - potential electrode copper sheet;
[0033] 5 - conductor shielding test piece. DETAILED DESCRIPTION
[0034] As shown in Figures 1 to 6 , the utility model discloses a kind of electric power cable conductor shielding volume resistivity test devices, by lifting pressure plate 1, conductive electrode fixing device 2, fixed frame 3 and copper sheet mold 4.
[0035] Fixed frame 3 is composed of upper base 31, four support columns 32 and lower base 33, four support columns 32 are connected on upper base 31 and lower base 33, and four support columns 32 can be used to connect, guide lifting pressure plate 1.
[0036] The lifting pressure plate 1 is located between the upper base 31 and the lower base 33, and the lifting pressure plate 1 comprises a rotating handle 11 for lifting, the rotating handle 11 is installed on the upper base 31, and the rotating shaft 13 below the rotating handle 11 is connected to the lifting pressure plate 1; the rotating handle 11 is rotated to drive the lifting pressure plate 1 to move up and down through the rotating shaft 13. The lifting pressure plate 1 further comprises a semicircular fixed insulating plate 12, which is fixed at the bottom of the lifting pressure plate 1 and moves up and down with the lifting pressure plate 1, so as to realize the up and down movement of the semicircular fixed insulating plate 12, and the semicircular fixed insulating plate 12 can press the fixed conductor shielding test piece 5 when the lifting pressure plate 1 moves downward.
[0037] The conductive electrode fixing device 2 has two longitudinal current electrode cylinders 21, two potential electrode cylinders 22 and an electrode insulating plate 23, the electrode insulating plate 23 is installed on the lower base 33, the two potential electrode cylinders 22 and the two current electrode cylinders 21 are fixed on the electrode insulating plate 23, and the potential electrode cylinder 22 and the current electrode cylinder 21 are opposite to the semicircular fixed insulating plate 12 of the lifting pressure plate 1; the potential electrode cylinder 22 and the current electrode cylinder 21 are provided with insertion slots, and the potential electrode cylinder 22 and the current electrode cylinder 21 are arranged at a standard interval, specifically, the two potential electrode cylinders 22 are 50mm apart from the inner side of the insertion slot, and the two current electrode cylinders 21 are 25mm apart from the outer side of the potential electrode cylinder 22, so as to meet the standard requirement that the interval between the two potential electrodes is 50mm, and the two current electrodes are at least 25mm apart from the outer side of the potential electrode. The current electrode cylinder 21 and the potential electrode cylinder 22 are used for positioning and connecting current and voltage.
[0038] The copper sheet mold 4 is provided with two current electrode copper sheets 41 and two potential electrode copper sheets 42, the potential electrode copper sheet 42 and the current electrode copper sheet 41 are respectively placed on the insertion slots of the corresponding two potential electrode cylinders 22 and two current electrode cylinders 21, the copper sheet mold 4 is connected with the inner surface of the conductor shielding test piece 5, and the copper sheet mold 4 is also connected with the corresponding current electrode cylinder 21 and potential electrode cylinder 22, so as to form an electrode.
[0039] The utility model further sets up V type positioning slot 121 at the lower end of semicircular fixed insulating plate 12, and the bottom of V type positioning slot 121 is semicircular 122, so as to facilitate the semicircular fixed insulating plate 12 to press the outer surface of the conductor shielding test piece 5. Moreover, the semicircular fixed insulating plate 12 is further provided with four groups, which are located above the two potential electrode cylinders 22 and the two current electrode cylinders 21 respectively, and each group of the semicircular fixed insulating plate 12 has two parallel plates, which are all conducive to pressing the outer surface of the conductor shielding test piece 5, reducing the test error and making the data more stable.
[0040] The lifting pressure plate 1 corresponds to four support columns 32 to form guide holes 14, and the four support columns 32 pass through the guide holes 14, so that the lifting pressure plate 1 can stably rise and fall along the four support columns 32.
[0041] When the conductor shielding test piece 5 is prepared, the copper sheet mold 4 of the corresponding specification is selected, the current electrode copper sheet 41 is placed on the current electrode cylinder 21, the potential electrode copper sheet 42 is placed on the potential electrode cylinder 22, and then the inner surface of the conductor shielding test piece 5 is placed above the copper sheet mold 4, the rotating handle 11 is rotated to make the lifting pressure plate 1 press down, the semicircular fixed insulation plate 12 is tightly pressed on the outer surface of the conductor shielding test piece 5, the conductor shielding test piece 5, the copper sheet mold 4 and the conductive electrode fixing device 2 are tightly connected to form an electrode.
[0042] According to the power cable conductor shielding volume resistivity testing device, the copper sheet mold 4 is used to form an electrode, so that the curing time of manual conductive silver paint and silver electrode is saved, the detection efficiency is improved, the use of conductive silver paint is saved, the cost is saved, the unevenness of manual conductive silver paint is avoided, the test error is reduced, the data is more stable, the use of conductive silver paint is avoided, and the environment and personal safety are improved.
[0043] The utility model has disclosed as above with preferable embodiment, but it is not the limitation of the utility model, any modification, equivalent replacement and improvement etc. of any person skilled in the art without departing from the spirit of the utility model should be contained in the protection scope of the utility model.
Claims
1. A device for testing the volume resistivity of conductor shielding in power cables, characterized in that: It consists of a fixed frame, a lifting pressure plate, a conductive electrode fixing device, and a copper sheet mold; The mounting bracket includes four support columns, which are connected to the upper base and the lower base. The lifting pressure plate is located between the upper base and the lower base. The lifting pressure plate includes a rotating handle for lifting. The rotating handle is mounted on the upper base, and the rotating shaft of the rotating handle is connected to the lifting pressure plate. The rotating handle drives the lifting pressure plate to move up and down through the rotating shaft. The lifting pressure plate also includes a semi-circular fixed insulating plate, which is fixed to the bottom of the lifting pressure plate. The conductive electrode fixing device has an electrode insulating plate, a potential electrode cylinder, and a current electrode cylinder. The electrode insulating plate is installed on the lower base. Two potential electrode cylinders and two current electrode cylinders are fixed on the electrode insulating plate, and the potential electrode cylinders and current electrode cylinders are directly opposite the semi-circular fixed insulating plate of the lifting pressure plate. Slots are opened on both the potential electrode cylinders and the current electrode cylinders, and the spacing between the potential electrode cylinders and the current electrode cylinders is set according to the standard. The copper sheet mold is equipped with two potential electrode copper sheets and two current electrode copper sheets. The potential electrode copper sheets and the current electrode copper sheets are respectively placed in the slots of the corresponding two potential electrode cylinders and two current electrode cylinders. The copper sheet mold is used to connect with the inner surface of the conductor shielding test piece, and also to the corresponding current electrode cylinders and potential electrode cylinders to form electrodes.
2. The power cable conductor shield volume resistivity testing device as described in claim 1, characterized in that: The lower end of the semi-circular fixed insulating plate has a V-shaped positioning notch, and the bottom of the V-shaped positioning notch is semi-circular.
3. The power cable conductor shield volume resistivity testing device as described in claim 1, characterized in that: There are four sets of semi-circular fixed insulating plates, which are located above the two potential electrode cylinders and the two current electrode cylinders, respectively.
4. The power cable conductor shield volume resistivity testing device as described in claim 1, characterized in that: Each group of the semicircular fixed insulating plates has two parallel plates.
5. The power cable conductor shield volume resistivity testing device as described in claim 1, characterized in that: The lifting pressure plate forms guide holes corresponding to the four support columns, and the four support columns are inserted into the guide holes, so that the lifting pressure plate moves up and down along the four support columns.