Cut-surface discharge simulation device of cable joint
By designing a surface discharge simulation device for cable joints, and using a multi-stage needle-needle electrode array and cold shrink tubing to simulate surface discharge of cable joints, the problem of analyzing cable joint combustion and explosion accidents was solved, and accurate simulation and analysis of the discharge process was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
- Filing Date
- 2026-02-06
- Publication Date
- 2026-05-08
AI Technical Summary
Existing technologies are insufficient to effectively simulate the surface discharge process of cable joints, making it difficult to analyze combustion and explosion accidents.
A surface discharge simulation device for cable joints was designed, including a cable joint simulation component, a high-voltage power supply, a discharge monitoring component, and a control component. The surface discharge process of the cable joint is simulated by a multi-stage needle-needle electrode array and a cold shrink tube. The discharge monitoring component is used to obtain status information, and the control component analyzes the discharge situation.
It enables accurate simulation of surface discharge at cable joints, allowing analysis of the occurrence mechanism and extent of combustion and explosion accidents, and providing a scientific laboratory analysis method.
Smart Images
Figure CN121995174A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power grid technology, and in particular to a surface discharge simulation device for a cable joint. Background Technology
[0002] As the national power transmission network continues to extend and the length of cables gradually increases, the number of cable joints also increases. These intermediate joints are weak points in the insulation of cable lines. The electric field distribution at their interface is extremely uneven, and they are very prone to long-range arc discharge along the surface due to insulation deterioration or damage, which can then induce combustion and explosion accidents.
[0003] In the research of cable joint combustion and explosion problems, it is often necessary to reproduce the surface discharge process of the cable joint through laboratory simulation in order to analyze combustion and explosion accidents. Therefore, there is an urgent need for a device that can simulate the surface discharge of cable joints. Summary of the Invention
[0004] Therefore, it is necessary to provide a surface discharge simulation device for cable joints that can simulate surface discharge of cable joints, in order to address the above-mentioned technical problems.
[0005] In a first aspect, this application provides a surface discharge simulation device for a cable joint, including a cable joint simulation component, a high-voltage power supply, a discharge monitoring component, and a control component;
[0006] The cable joint simulation assembly includes a cable, a multi-stage needle-needle electrode array, and a cold shrink tubing. The surface of the cable is uniformly coated with insulating silicone grease. The multi-stage needle-needle electrodes are fitted on the outside of the insulating silicone grease, and the cold shrink tubing is fitted on the outside of the multi-stage needle-needle electrode array. The positive terminal of the high-voltage power supply is connected to the high-potential end of the multi-stage needle-needle electrode array, and the negative terminal of the high-voltage power supply is connected to the zero-potential end of the multi-stage needle-needle electrode array. The control component is connected to the high-voltage power supply and the discharge monitoring component.
[0007] The discharge monitoring component is used to acquire the first state information of the cable joint simulation component and send the first state information to the control component.
[0008] A high-voltage power supply is used to apply voltage to the cable connector emulator under the control of the control components.
[0009] Cable joint simulation assembly for inducing surface discharge under voltage;
[0010] The discharge monitoring component is also used to acquire the second state information of the cable joint simulation component after the surface discharge ends, and send the second state information to the control component;
[0011] A control component is used to determine the surface discharge status information of the cable joint simulation component based on the first state information and the second state information.
[0012] In one embodiment, the control component is configured to determine, based on first state information and second state information, whether the cable joint simulation component has experienced surface discharge and the degree of surface discharge, and to determine whether the cable joint simulation component has experienced surface discharge and the degree of surface discharge as surface discharge status information of the cable joint simulation component.
[0013] In one embodiment, a control component is configured to adjust the voltage applied to the cable joint simulation component by the high-voltage power supply when the surface discharge information of the cable joint simulation component indicates that no surface discharge has occurred in the cable joint simulation component.
[0014] In one embodiment, the cold shrink tubing includes a first cold shrink tubing, which is fitted onto the outside of the multi-stage needle-needle electrode array; wherein the first cold shrink tubing is composed of an insulating rubber layer, a high-voltage shielding tube, and a stress cone in sequence.
[0015] In one embodiment, the cold shrink tubing further includes a second cold shrink tubing, which is fitted over the outside of the first cold shrink tubing; wherein the second cold shrink tubing is a rubber cold shrink tubing.
[0016] In one embodiment, the outer side of the second cold shrink tubing is wrapped with insulating tape.
[0017] In one embodiment, the multi-stage needle-needle electrode array is a series of needle-shaped electrodes made of brass, and the degree of electric field non-uniformity generated by the length of the electrodes and the needle tip angle decreases from the left to the right of the interlayer interface of the cable connector simulation component.
[0018] In one embodiment, the sharpest electrode on the left side of the multi-level needle-needle electrode array is the high-potential end, and the bluntest electrode on the right side of the multi-level needle-needle electrode array is the zero-potential end.
[0019] In one embodiment, the voltage output by the high-voltage power supply is a positive voltage.
[0020] In one embodiment, the cable is a cross-linked polyethylene cable.
[0021] The aforementioned surface discharge simulation device for cable joints includes a cable joint simulation component, a high-voltage power supply, a discharge monitoring component, and a control component. The cable joint simulation component comprises a cable, a multi-stage needle-needle electrode array, and a cold-shrink tubing. The surface of the cable is uniformly coated with insulating silicone grease. The multi-stage needle-needle electrodes are fitted onto the outside of the insulating silicone grease, and the cold-shrink tubing is fitted onto the outside of the multi-stage needle-needle electrode array. The positive terminal of the high-voltage power supply is connected to the high-potential end of the multi-stage needle-needle electrode array, and the negative terminal of the high-voltage power supply is connected to the zero-potential end of the multi-stage needle-needle electrode array. The control component is connected to the high-voltage power supply and the discharge monitoring component. The discharge monitoring component acquires first state information of the cable joint simulation component and sends this first state information to the control component. The high-voltage power supply applies voltage to the cable joint simulation component under the control of the control component. The cable joint simulation component undergoes surface discharge under the influence of the voltage. The discharge monitoring component also acquires second state information of the cable joint simulation component after the surface discharge ends and sends this second state information to the control component. The control component determines the surface discharge status information of the cable joint simulation component based on the first and second state information. The surface discharge simulation device for cable joints provided in this application can simulate surface discharge of cable joints, thereby enabling the analysis of combustion and explosion accidents. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of a surface discharge simulation device for a cable connector in one embodiment;
[0024] Figure 2 This is a schematic diagram of a cable connector simulation assembly in one embodiment;
[0025] Figure 3 This is a schematic diagram of the first cold shrink tubing in one embodiment. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0027] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0028] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0030] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0031] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.
[0032] In one exemplary embodiment, such as Figure 1 As shown, a surface discharge simulation device 100 for a cable joint is provided. The surface discharge simulation device 100 includes a cable joint simulation component 101, a high-voltage power supply 102, a discharge monitoring component 103, and a control component (not shown in the figure). The control component is connected to the high-voltage power supply 102 and the discharge monitoring component 103.
[0033] For example, such as Figure 2 As shown, the cable connector simulation assembly 101 may include a cable 1011, a multi-stage needle-needle electrode array 1012, and a cold shrink tubing 1013.
[0034] The cable surface is uniformly coated with insulating silicone grease to simulate the basic structure of one side of the actual cable joint; multi-level needle-needle electrodes are mounted on the outside of the insulating silicone grease; and cold shrink tubing is mounted on the outside of the multi-level needle-needle electrode array.
[0035] For example, the positive terminal of the high-voltage power supply 102 is connected to the high-potential end of the multi-stage needle-needle electrode array 1012, and the negative terminal of the high-voltage power supply 102 is connected to the zero-potential end of the multi-stage needle-needle electrode array 1012.
[0036] Optionally, the discharge monitoring component can be a high-speed camera, voltage sensor, current sensor, and image acquisition module, etc. The high-speed camera uses industrial-grade equipment with a frame rate of no less than 1000fps and a resolution of no less than 1920×1080 pixels. The lens is equipped with a macro adapter and is fixed at a distance of 10130-50cm from the cable joint simulation component via an adjustable bracket. The lens axis forms an angle of 30°-45° with the interlayer interface to ensure clear capture of the entire process of arc initiation, extension, stabilization, and extinction. The voltage sensor is a high-voltage divider sensor with a range of 0-150kV and a measurement accuracy of ±0.5%. It is connected in series on the wire between the positive terminal of the high-voltage power supply and the high-potential end to collect real-time voltage dynamic change data during the discharge process. The current sensor is a Rogowski coil sensor with a range of 0-100A and a measurement accuracy of ±1%. It is sleeved on the negative wire to collect discharge current parameters in a non-contact manner. The image acquisition module uses a high-definition industrial camera with a resolution of no less than 2048×1536 pixels and is equipped with a ring fill light to capture the surface microscopic state of the cable joint simulation component before and after discharge.
[0037] Control components can be industrial control equipment with data processing and instruction control functions. Examples include industrial computers, programmable logic controllers (PLCs), and microcontroller units (MCUs).
[0038] In some exemplary embodiments, the discharge monitoring component can be used to acquire first state information of the cable joint simulation component and send the first state information to the control component.
[0039] The first state information refers to the initial state parameters of the cable joint simulation assembly before surface discharge occurs. For example, the initial morphology of the interface between the cable and the cold shrink tubing, the initial electric field distribution data between the electrodes, and the surface state of the insulating silicone grease.
[0040] Specifically, the discharge monitoring component and the control component can be connected via wired or wireless connection. After the discharge monitoring component obtains the first state information of the cable connector simulation component, it can send the first state information to the control component via wired or wireless connection.
[0041] Furthermore, the high-voltage power supply can be used to apply voltage to the cable joint simulation component under the control of the control component.
[0042] Specifically, the high-voltage power supply and the control component can be connected via wired or wireless connection. After the discharge monitoring component obtains the first state information of the cable joint simulation component and sends the first state information to the control component, the control component can control the high-voltage power supply to start through the wired or wireless connection and apply voltage to the cable joint simulation component according to the preset voltage amplitude, voltage boosting rate and voltage stabilization time.
[0043] Furthermore, the cable joint simulation assembly can be used to induce surface discharge under voltage.
[0044] Specifically, the voltage causes the needle electrode of the cable joint simulation component near the right side of the interlayer interface to break down first, and then, after shortening the entire discharge gap, it breaks down sequentially towards the left side of the interlayer interface, thus creating a stable long arc surface discharge across the entire interlayer interface.
[0045] Furthermore, the discharge monitoring component can also be used to acquire the second state information of the cable joint simulation component after the surface discharge ends, and send the second state information to the control component.
[0046] The second state information refers to the post-discharge state parameters of the cable joint simulation component after surface discharge occurs. It can be used to reflect the impact of the discharge process on the structure and insulation performance of the cable joint simulation component. For example, arc erosion marks at the interface between the cable and the cold shrink tubing, the carbonization / loss state of the insulating silicone grease, the loss and deformation of the multi-stage needle-to-needle electrodes, and the damage or aging marks of the cold shrink tubing.
[0047] Specifically, after the cable joint simulation component undergoes surface discharge under the action of voltage, the discharge monitoring component can obtain the second state information of the cable joint simulation component and send the second state information to the control component.
[0048] Furthermore, the control component can be used to determine the surface discharge status information of the cable joint simulation component based on the first state information and the second state information.
[0049] Among them, the surface discharge information can be used to indicate whether surface discharge has occurred in the cable joint simulation assembly, and the extent of surface discharge.
[0050] Specifically, the control component can determine the surface discharge situation by comparing and analyzing the first state information with the second state information. For example, if the second state information shows characteristics not present in the first state information, such as arc erosion marks, insulating grease carbonization / loss, electrode wear and deformation, or cold shrink tube damage, then surface discharge is determined to have occurred. At the same time, based on the quantitative analysis results of parameters such as the area and depth of the erosion marks, the range of insulating grease carbonization, and the amount of electrode wear, the degree of surface discharge is determined (e.g., mild discharge: only slight erosion marks exist, and the insulation performance is not significantly reduced; moderate discharge: local carbonization / damage occurs, and the insulation performance is somewhat reduced; severe discharge: large-area erosion or insulation structure failure). In addition, the probability of occurrence and the degree of development of surface discharge under different voltage conditions can be analyzed by combining the voltage parameters applied by the high-voltage power supply.
[0051] The aforementioned surface discharge simulation device for cable joints includes a cable joint simulation component, a high-voltage power supply, a discharge monitoring component, and a control component. The cable joint simulation component comprises a cable, a multi-stage needle-needle electrode array, and a cold-shrink tubing. The surface of the cable is uniformly coated with insulating silicone grease. The multi-stage needle-needle electrodes are fitted onto the outside of the insulating silicone grease, and the cold-shrink tubing is fitted onto the outside of the multi-stage needle-needle electrode array. The positive terminal of the high-voltage power supply is connected to the high-potential end of the multi-stage needle-needle electrode array, and the negative terminal of the high-voltage power supply is connected to the zero-potential end of the multi-stage needle-needle electrode array. The control component is connected to the high-voltage power supply and the discharge monitoring component. The discharge monitoring component acquires first state information of the cable joint simulation component and sends this first state information to the control component. The high-voltage power supply applies voltage to the cable joint simulation component under the control of the control component. The cable joint simulation component undergoes surface discharge under the influence of the voltage. The discharge monitoring component also acquires second state information of the cable joint simulation component after the surface discharge ends and sends this second state information to the control component. The control component determines the surface discharge status information of the cable joint simulation component based on the first and second state information. The surface discharge simulation device for cable joints provided in this application can simulate surface discharge of cable joints, thereby enabling the analysis of combustion and explosion accidents.
[0052] In some exemplary embodiments, the control component is configured to determine, based on first state information and second state information, whether the cable joint simulation component has experienced surface discharge and the degree of surface discharge, and to determine whether the cable joint simulation component has experienced surface discharge and the degree of surface discharge as surface discharge status information of the cable joint simulation component.
[0053] Specifically, the control component can input the first state information and the second state information into the pre-trained analysis model to obtain whether the cable joint simulation component has experienced surface discharge and the degree of surface discharge. The control component can determine whether the cable joint simulation component has experienced surface discharge and the degree of surface discharge as the surface discharge status information of the cable joint simulation component.
[0054] In some exemplary embodiments, a control component is configured to adjust the voltage applied to the cable joint simulation component by the high-voltage power supply when the surface discharge information of the cable joint simulation component indicates that no surface discharge has occurred in the cable joint simulation component.
[0055] Specifically, if the control component determines that the cable joint simulation component has not experienced surface discharge based on the surface discharge information of the cable joint simulation component, it can gradually increase the voltage amplitude of the high-voltage power supply output or increase the voltage boosting rate according to the preset voltage adjustment strategy, and apply voltage to the cable joint simulation component again. At the same time, the control discharge monitoring component synchronously collects the first state information after voltage adjustment and the second state information after discharge, and repeats the comparison and analysis process until the cable joint simulation component experiences surface discharge or reaches the preset maximum voltage threshold, and then stops the adjustment.
[0056] In some exemplary embodiments, the cold shrink tubing includes a first cold shrink tubing that is fitted onto the outside of the multi-stage needle-needle electrode array.
[0057] For example, such as Figure 3 As shown, the first cold shrink tube is composed of an insulating rubber layer (not shown in the figure), a high-voltage shielding tube 301, and a stress cone 302 in sequence.
[0058] In some exemplary embodiments, the cold shrink tubing further includes a second cold shrink tubing, which is fitted over the outside of the first cold shrink tubing; wherein the second cold shrink tubing is a rubber cold shrink tubing.
[0059] In some exemplary embodiments, insulating tape is wrapped around the outer side of the second cold shrink tubing and the outer side of the cable, and the cold shrink tubing and insulating tape simulate the multi-layer structure of an actual cable joint.
[0060] In some exemplary embodiments, the multi-stage needle-needle electrode array consists of brass needle-shaped series electrodes. The degree of electric field non-uniformity generated by the electrode length and needle tip angle decreases from the left to the right of the interlayer interface of the cable connector simulation component. The sharpest electrode on the left side of the multi-stage needle-needle electrode array is the high-potential end, and the bluntest electrode on the right side of the multi-stage needle-needle electrode array is the zero-potential end.
[0061] For example, by utilizing a multi-stage needle-needle electrode array, the conditions required to achieve stable surface discharge between the insulating rubber cold-shrink tubing and the cable at the interlayer interface can be reduced. A specially designed needle-needle electrode array is fixedly mounted in the interlayer interface, and the two poles of a high-voltage power supply are connected to the left and right sides of the needle-needle electrode array.
[0062] After applying insulating silicone grease to the outside of the cable, several needle-to-needle series electrodes are placed on it as intermediate electrodes. The closer the electrode is to the right, the smaller the needle tip angle, the longer the needle tip, the more uneven the gap, and the worse the uniformity of the electric field, making it easier to be broken down. The distance between the left and right ends of the needle-to-needle electrodes is the test setting value, which is also the length of the discharge surface when energized.
[0063] In some exemplary embodiments, the voltage output by the high-voltage power supply is a positive voltage. In some exemplary embodiments, the cable is a cross-linked polyethylene cable.
[0064] The surface discharge simulation device for cable joints provided in this application employs a multi-stage needle-needle electrode array to achieve long arc discharge at the interface of the cable joint interlayer, which can minimize the voltage required for discharge and shorten the distance of the discharge gap. Moreover, by using needle electrodes with sharper tips as positive electrodes, a high voltage is input to the positive electrode, while the other side is at zero potential, thereby breaking down sequentially. Compared with the negative electrode, this can significantly reduce the required high voltage. By changing the shape of the multi-stage needle-needle electrode array, the uniformity of the electric field is changed, causing it to break down faster towards the left side, applying a higher voltage to the remaining electrodes, thereby achieving a chain reaction. Furthermore, the needle-needle electrode array is located outside the polyethylene insulating rod, so it will not affect the on-site assembly of the outer cold shrink tubing and its prefabricated components.
[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.
[0066] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.
Claims
1. A surface discharge simulation device for a cable joint, characterized in that, The surface discharge simulation device for the cable joint includes a cable joint simulation component, a high-voltage power supply, a discharge monitoring component, and a control component. The cable connector simulation assembly includes a cable, a multi-stage needle-needle electrode array, and a cold shrink tubing. The surface of the cable is uniformly coated with insulating silicone grease. The multi-stage needle-needle electrodes are fitted on the outside of the insulating silicone grease, and the cold shrink tubing is fitted on the outside of the multi-stage needle-needle electrode array. The positive terminal of the high-voltage power supply is connected to the high-potential end of the multi-stage needle-needle electrode array, and the negative terminal of the high-voltage power supply is connected to the zero-potential end of the multi-stage needle-needle electrode array. The control assembly is connected to the high-voltage power supply and the discharge monitoring assembly. The discharge monitoring component is used to acquire the first state information of the cable joint simulation component and send the first state information to the control component. The high-voltage power supply is used to apply voltage to the cable joint simulation component under the control of the control component; The cable joint simulation assembly is used to generate surface discharge under the action of the voltage; The discharge monitoring component is further configured to acquire the second state information of the cable joint simulation component after the surface discharge ends, and send the second state information to the control component; The control component is used to determine the surface discharge status information of the cable joint simulation component based on the first status information and the second status information.
2. The apparatus according to claim 1, characterized in that, The control component is configured to determine, based on the first state information and the second state information, whether the cable joint simulation component has experienced surface discharge and the degree of surface discharge, and to define whether the cable joint simulation component has experienced surface discharge and the degree of surface discharge as surface discharge status information of the cable joint simulation component.
3. The apparatus according to claim 2, characterized in that, The control component is configured to adjust the voltage applied by the high-voltage power supply to the cable joint simulation component when the surface discharge information of the cable joint simulation component indicates that the surface discharge has not occurred in the cable joint simulation component.
4. The apparatus according to any one of claims 1 to 3, characterized in that, The cold shrink tubing includes a first cold shrink tubing, which is fitted onto the outside of the multi-stage needle-needle electrode array. The first cold shrink tube is composed of an insulating rubber layer, a high-voltage shielding tube, and a stress cone in sequence.
5. The apparatus according to claim 4, characterized in that, The cold shrink tubing also includes a second cold shrink tubing, which is fitted onto the outside of the first cold shrink tubing. The second cold shrink tubing is a rubber cold shrink tubing.
6. The apparatus according to claim 5, characterized in that, The outer side of the second cold shrink tube is wrapped with insulating tape.
7. The apparatus according to any one of claims 1 to 3, characterized in that, The multi-stage needle-needle electrode array consists of brass needle-shaped series electrodes. The degree of electric field non-uniformity generated by the length of the electrodes and the needle tip angle decreases from the left to the right of the interlayer interface of the cable connector simulation component.
8. The apparatus according to claim 7, characterized in that, In the multi-level needle-needle electrode array, the sharpest electrode on the left side of the array is the high potential end, and the bluntest electrode on the right side of the array is the zero potential end.
9. The apparatus according to any one of claims 1 to 3, characterized in that, The voltage output by the high-voltage power supply is a positive voltage.
10. The apparatus according to any one of claims 1 to 3, characterized in that, The cable is a cross-linked polyethylene cable.