Cable partial discharge positioning detection device and cable apparatus

Abstract

The application belongs to the technical field of power detection equipment, and particularly relates to a cable partial discharge positioning detection device and a cable equipment. The cable partial discharge positioning detection device comprises: a marking coating, which is suitable for being applied to the outer surface of the insulation layer of a cable joint, and can generate marking gas under the action of partial discharge; and a detection assembly, which is arranged on the outer surface of the shielding layer at the cable joint, and is suitable for detecting the concentration of the marking gas to determine whether partial discharge occurs, and sending a detection signal corresponding to the partial discharge outward. Through the technical scheme of the application, the concentration of the marking gas generated by the marking coating under the action of partial discharge can be detected to realize partial discharge detection, and the corresponding detection signal can be sent outward to realize position marking and prompting, so that the accurate position of the partial discharge can be determined, the operator can timely perform corresponding maintenance operation, the maintenance work efficiency can be greatly improved, and the maintenance cost can be reduced.

Description

Technical Field

[0001] This invention belongs to the field of power testing equipment technology, specifically relating to a cable partial discharge location and detection device and cable equipment. Background Technology

[0002] In the power sector, to meet urban construction requirements, power lines are primarily laid underground, such as through direct burial or via conduits, trenches, and tunnels. Distribution cables are generally laid directly underground or in conduits. To reduce damage to the cables from traction, cable wells are typically constructed at intervals (e.g., tens to hundreds of meters). Intermediate cable joints are placed within these wells for easy installation and maintenance. Due to factors such as joint manufacturing processes, the manufacturing environment, and the operating environment, partial discharge frequently occurs at cable joints during operation. Prolonged partial discharge can lead to through-discharge faults at the cable joints, affecting the normal operation of the line and reducing the reliability of the power supply.

[0003] Therefore, existing technologies typically employ high-frequency partial discharge testing (applicable to voltage levels of 66kV and above) and oscillating wave partial discharge testing (applicable to high-voltage cables of 35kV and below) to detect partial discharge phenomena. However, due to the numerous cable joints in cable lines, the high-frequency partial discharge test cannot determine the distance and direction of the partial discharge from the signal acquisition point, nor can it accurately pinpoint which joint is experiencing partial discharge, requiring prior determination of the partial discharge location. While the oscillating wave partial discharge test can detect the approximate distance of the partial discharge from the signal acquisition point, it still struggles to accurately determine the precise location of the partial discharge, requiring operators to systematically check each cable joint within a general area, resulting in low operational efficiency, high testing costs, and significant time and labor consumption. Summary of the Invention

[0004] In view of this, in order to improve the problem of difficulty in accurately determining the location of partial discharge in the prior art, the present invention provides a cable partial discharge location detection device and cable equipment.

[0005] This invention provides a cable partial discharge location detection device, comprising: a marking coating adapted to be applied to the outer surface of the insulation layer of a cable joint, wherein the marking coating is capable of generating marking gas under the action of partial discharge; and a detection component disposed on the outer surface of the shielding layer at the cable joint, wherein the detection component is adapted to detect the concentration of the marking gas to determine whether partial discharge has occurred, and to send out a detection signal corresponding to the partial discharge.

[0006] In one feasible implementation, the marking coating is formed of an insulating material; the marking gas is a non-conductive protective gas.

[0007] In one feasible implementation, the insulating material comprises melamine dissolved in glycerol; the marking gas is nitrogen; wherein partial discharge is determined to occur when the concentration of the marking gas is higher than 83%.

[0008] In one feasible implementation, the detection component includes: a gas collector fixedly connected to the outer surface of the shielding layer of the cable connector, the gas collector being adapted to collect gas; a detection module disposed in the gas collector, the detection module being adapted to detect the concentration of the marker gas and trigger a detection signal when the concentration of the marker gas is greater than a target threshold; and a signal transmitter disposed on the gas collector and communicatively connected to the detection module, the signal transmitter being adapted to send a detection signal outward.

[0009] In one feasible implementation, the gas collector is provided with a connection structure adapted to the shielding layer of the cable connector, the connection structure being suitable for connection and fixation to the shielding layer of the cable connector; wherein, the connection structure includes any one of insulating clips, insulating clamps, or insulating adhesives.

[0010] In one feasible implementation, the cable partial discharge location detection device further includes an alarm component disposed on the outer surface of the protective layer of the cable joint. The alarm component is communicatively connected to the detection component to output alarm information based on the detection signal.

[0011] In one feasible implementation, the alarm component includes: a signal receiver for receiving a detection signal; and an alarm module communicatively connected to the signal receiver, the alarm module including: an indicator light device adapted to illuminate an indicator light according to the detection signal; and a sound output device adapted to output sound information according to the detection signal.

[0012] In one feasible implementation, the cable partial discharge location detection device further includes: a remote terminal device wirelessly connected to the detection component, the remote terminal device being adapted to receive and display the detection signals of the detection component; wherein, the detection signals include concentration information of the marker gas and location information of the cable joint.

[0013] In one feasible implementation, the remote terminal device includes any one of a mobile phone, a computer, or a remote monitoring station.

[0014] The second aspect of the present invention provides a cable device, comprising: a plurality of cables connected in sequence, wherein the connection between two adjacent cables forms a cable joint; and a cable partial discharge location detection device of any of the first aspects is disposed at the cable joint.

[0015] The beneficial effects of the above-mentioned technical solution of the present invention are as follows:

[0016] By pre-applying a marking coating to the cable joint, partial discharge can be detected by measuring the concentration of marking gas generated by the coating under the influence of partial discharge. Simultaneously, the detection component can send out corresponding detection signals to mark and alert the location of the partial discharge, thereby accurately determining the location of the partial discharge. This allows operators to promptly perform corresponding maintenance operations at the site where the partial discharge occurs, significantly improving maintenance efficiency and reducing maintenance costs. Attached Figure Description

[0017] Figure 1 The diagram shown is a schematic diagram of a cable partial discharge location and detection device provided in an embodiment of the present invention.

[0018] Figure 2 The diagram shown is a schematic block diagram of a detection component provided in one embodiment of the present invention.

[0019] Figure 3 The diagram shown is a schematic diagram of the internal structure of an electrical detection component provided in an embodiment of the present invention.

[0020] Figure 4 The diagram shown is a schematic diagram of another detection component provided in one embodiment of the present invention.

[0021] Figure 5 The diagram shown is a schematic diagram of another cable partial discharge location and detection device provided in one embodiment of the present invention.

[0022] Figure 6 The figure shown is a schematic block diagram of an alarm component provided in one embodiment of the present invention.

[0023] Figure 7 The diagram shown is a schematic block diagram of another cable partial discharge location and detection device provided in an embodiment of the present invention.

[0024] Figure 8 The diagram shown is a schematic diagram of a cable device provided in one embodiment of the present invention. Detailed Implementation

[0025] In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, top, bottom, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0026] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] Application Overview

[0029] In recent years, with urban development, power lines have primarily been laid underground to meet urban construction requirements. Traditional underground laying methods include direct burial, or laying through pipes, trenches, and tunnels. Generally, distribution cables mainly use direct burial and pipe laying methods. Due to the relatively long overall length of distribution cables, to reduce damage from traction during installation, they are usually laid in sections. Cable wells are constructed at regular intervals (e.g., tens to hundreds of meters), and the intermediate joints between two cable sections are placed in the cable wells for easy installation and maintenance. However, due to factors such as joint manufacturing processes, manufacturing environment, and operating environment, partial discharge frequently occurs at cable joints during operation. Prolonged partial discharge can lead to through-discharge faults at the cable joints, affecting the normal operation of the line and significantly reducing the reliability of the power supply.

[0030] In existing technologies, high-frequency partial discharge tests (applicable to voltage levels of 66kV and above) and oscillating wave partial discharge tests (applicable to high-voltage cables of 35kV and below) can be used to detect partial discharge phenomena. However, due to the numerous cable joints in cable lines, the high-frequency partial discharge test cannot determine the distance and direction of the partial discharge from the signal acquisition point, and cannot accurately determine which joint is experiencing partial discharge, requiring prior determination of the partial discharge location. While the oscillating wave partial discharge test can detect the approximate distance of the partial discharge from the signal acquisition point, it still cannot accurately determine the precise location of the partial discharge, requiring operators to check each cable joint within a general area, resulting in low operational efficiency, high detection costs, and significant time and labor consumption. Therefore, there is an urgent need for a device capable of accurately locating the partial discharge.

[0031] The following provides some embodiments of the cable partial discharge location detection device and cable equipment in the technical solution of the present invention.

[0032] In one embodiment of the first aspect of the present invention, a cable partial discharge location detection device 100 is provided, which can be applied to a cable joint 520. For example... Figure 1 As shown, the cable partial discharge location detection device 100 includes a marking coating 1 and a detection component 2. The marking coating 1 is made of a special material and is applied to the outer surface of the insulation layer 522 of the cable joint 520 during use. When a partial discharge occurs in the cable joint 520, the electrical energy from the partial discharge heats the insulation layer 522, causing the marking coating 1 to decompose under the heat and generate a marking gas. The detection component 2 detects the concentration of the marking gas and determines whether a partial discharge has occurred based on whether the concentration exceeds a target threshold. When the concentration of the marking gas exceeds the target threshold, the detection component 2 sends a detection signal corresponding to the partial discharge to alert the user to the partial discharge. Since the detection component 2 is located within the shielding layer 523 of the cable joint 520, the heat generated by the partial discharge can effectively prevent it from affecting the detection component 2.

[0033] It should be noted that a typical cable, from the inside out, includes a conductor 521, an insulation layer 522, a shielding layer 523, and a protective layer 524. The detection component 2 can send the detection signal to a corresponding alarm device or a remote monitoring device, enabling maintenance personnel to promptly identify the specific location of the partial discharge. In practical applications, the cable partial discharge location detection device 100 of this embodiment can be installed at the cable joint 520 during cable laying to enable long-term monitoring during cable line operation. The detection signal from the detection component 2 contains corresponding parameters and location information. When multiple cable joints 520 are equipped with the cable partial discharge location detection device 100 of this embodiment, precise location can be achieved through the detection signal.

[0034] It is understandable that the existing testing methods are all post-event detections and rely on specialized testing equipment. They cannot be used for long-term monitoring and are difficult to detect the precise location of partial discharges, requiring maintenance personnel to conduct further investigations to determine the location.

[0035] The cable partial discharge location detection device 100 in this embodiment can monitor the cable joint 520 for a long time and determine the occurrence of partial discharge by the concentration of the marking gas generated by the marking coating 1. Then, it sends a corresponding detection signal to remind the maintenance personnel, so that the maintenance personnel can know the accurate location of the partial discharge in time, which facilitates the maintenance operation of the cable joint 520 where partial discharge occurs. There is no need to check each one individually, saving time and manpower, greatly improving maintenance efficiency, and effectively reducing the impact of partial discharge on the operation of cable lines.

[0036] In a further embodiment of the present invention, such as Figure 1 As shown, the marking coating 1 of the cable partial discharge location detection device 100 is formed by applying an insulating material to the insulation layer 522 of the cable joint 520. When partial discharge occurs, the marking coating 1 of the insulating material can also play an insulating role, preventing conductivity and further reducing the possibility of through-discharge faults. Correspondingly, the marking gas generated by the marking coating 1 is a non-conductive protective gas, which can form a gas protective layer around the cable joint 520 when partial discharge occurs, further preventing through-discharge faults.

[0037] Furthermore, in one specific implementation, the insulating material forming the marking coating 1 mainly includes melamine dissolved in glycerol, that is, a glycerol solution of melamine as the core material. Melamine is a triazine-based nitrogen-containing heterocyclic organic compound, which is non-flammable and relatively stable at room temperature. When applied to the insulating layer 522 of the cable joint 520, it can form a stable coating structure. Correspondingly, the marking gas is nitrogen gas produced by the thermal decomposition of melamine. Since nitrogen gas is a colorless, odorless, non-conductive, and harmless gas, it can be used as an inert protective gas. When partial discharge occurs, the nitrogen gas produced by the decomposition of the marking coating 1 surrounds the cable joint 520, forming a gaseous insulating protective layer.

[0038] The detection component 2 can determine whether a partial discharge has occurred by detecting the concentration of nitrogen. Since air itself contains approximately 78% nitrogen, the target threshold can be set to a nitrogen concentration greater than 78%, such as 83%. That is, when the detection component 2 detects that the current nitrogen concentration is greater than 83%, there is additional nitrogen generated by the decomposition of the marking coating 1 in the surface air, thus determining that a partial discharge has occurred.

[0039] It is understandable that the nitrogen concentration in the air is about 78%, but there is some fluctuation. If the target threshold is close to 78%, it may produce false alarms due to the fluctuation of the nitrogen concentration in the air itself. If the target threshold is set too high, there will be a problem of decreased sensitivity. Therefore, setting it to 83% can effectively balance both its own bias and sensitivity.

[0040] In a further embodiment of the present invention, such as Figure 2 and Figure 3 As shown, the detection component 2 includes a gas collector 21, a detection module 22, and a signal transmitter 23. The gas collector 21 is fixedly connected to the outer surface of the shielding layer 523 of the cable connector 520, and is capable of collecting gas. The detection module 22 is disposed inside the gas collector 21. When gas enters the gas collector 21 and comes into contact with the detection module 22, the detection module 22 can detect the concentration of the marked gas. The signal transmitter 23 is disposed on the gas collector 21 and is used to transmit communication signals. The signal transmitter 23 is communicatively connected to the detection module 22. When the concentration of the marked gas detected by the detection module 22 is greater than a target threshold, a detection signal is triggered, and the detection signal is transmitted externally through the signal transmitter 23.

[0041] Furthermore, such as Figure 3 As shown, the gas collector 21 can be a hollow box with ventilation holes 211 on its side wall to facilitate gas collection. The detection module 22 is housed inside the box, and the signal transmitter 23 is mounted on the outer wall of the box (e.g., Figure 3(The top wall of the box shown). The box can specifically adopt an openable structure to facilitate the installation of the detection module 22.

[0042] Furthermore, such as Figure 4 As shown, in the detection assembly 2, the gas collector 21 may also be provided with a connecting structure 212, which is adapted to the shielding layer 523 of the cable connector 520 and can be detachably connected to the outer surface of the shielding layer 523 of the cable connector 520. Specifically, the connecting structure 212 may adopt the following... Figure 4 The insulating clamp shown in the figure, of course, the connection structure 212 is also connected to the cable connector 520 by insulating buckles or insulating adhesives (such as insulating tape).

[0043] In a further embodiment of the present invention, such as Figure 5 As shown, the cable partial discharge location detection device 100 also includes an alarm component 3. The alarm component 3 is installed on the outer surface of the protective layer 524 of the cable joint 520 and can be directly observed. The alarm component 3 is communicatively connected to the detection component 2 (e.g., wireless communication connection). When the detection component 2 detects partial discharge, it triggers a detection signal, and the alarm component 3 can output alarm information corresponding to the detection signal. This allows maintenance personnel to determine which cable joint 520 has a partial discharge by visually observing the alarm information of the alarm component 3 at the maintenance site, achieving one-to-one precise location and further reducing the difficulty for maintenance personnel to confirm the location of the partial discharge.

[0044] Furthermore, such as Figure 5 and Figure 6 As shown, the alarm component 3 includes a signal receiver 31 and an alarm module 32. The signal receiver 31 is communicatively connected to the detection component 2 and is used to receive detection signals from the detection component 2. The alarm module 32 is communicatively connected to the signal receiver 31 and outputs alarm information after receiving the detection signal. Specifically, the alarm module 32 includes an indicator light device 321 and a sound output device 322. The indicator light device 321 can illuminate the indicator light as an alarm message, and the indicator light can be illuminated for a long time, intermittently, or flashing to make the prompting effect more intuitive and obvious. The sound output device 322 can output sound information as an alarm message, and the sound information includes, but is not limited to, alarm tones, voice, music, etc. The indicator light device 321 and the sound output device 322 can form an alarm message with sound and light structure, resulting in a better prompting effect.

[0045] In a further embodiment of the present invention, such as Figure 7As shown, the cable partial discharge location detection device 100 also includes a remote terminal device 4. The remote terminal device 4 is wirelessly connected to the detection component 2. It can receive the detection signals from the detection component 2 and display the corresponding information of the detection signals, enabling maintenance personnel to remotely monitor and locate the partial discharge phenomenon in a timely manner and accurately locate the position of the cable joint 520 where the partial discharge occurs.

[0046] Furthermore, in practical applications, the remote terminal device 4 can specifically be any of a mobile phone, computer, or remote monitoring station. For example, the remote terminal device 4 can be a mobile phone, which can have corresponding monitoring software installed. Maintenance personnel can monitor the status of any cable joint 520 in real time through the monitoring software. Once a partial discharge occurs in one of the cable joints 520, the detection component 2 sends a corresponding detection signal to the maintenance personnel's mobile phone. The mobile phone generates corresponding prompt information, which is displayed through the monitoring software. Maintenance personnel can use the monitoring software on their mobile phone to promptly understand the relevant parameters, location, and other information of the cable joint 520 where partial discharge occurred, for example, by displaying it on an electronic map, to facilitate corresponding maintenance work. The remote terminal device 4 in this embodiment can overcome the limitations of time and distance, realize real-time monitoring, and further improve the maintenance efficiency of partial discharge.

[0047] The following is a specific embodiment of the cable partial discharge location detection device 100 of the present invention.

[0048] like Figures 1 to 8 As shown, the cable partial discharge location detection device 100 includes a marking coating 1, a detection component 2, an alarm component 3, and a remote terminal device 4.

[0049] like Figure 5 As shown, the marking coating 1 is made of an insulating material, with melamine, which is soluble in glycerol, as the core material. In use, the insulating material is applied to the outer surface of the insulation layer 522 of the cable joint 520, forming the marking coating 1. Due to the special properties of melamine, when partial discharge occurs in the cable joint 520, the electrical energy of the partial discharge heats the insulation layer 522, causing the marking coating 1 to decompose under the influence of heat and produce nitrogen gas as a marking gas. This marking gas surrounds the cable joint 520 and forms an insulating protective gas, further preventing through-discharge faults.

[0050] like Figure 2 and Figure 3As shown, the detection component 2 includes a gas collector 21, a detection module 22, and a signal transmitter 23. The gas collector 21 is a hollow box with ventilation holes 211 on its side walls to facilitate gas collection. The detection module 22 is housed inside the box, and the signal transmitter 23 is mounted on the top wall of the box and is communicatively connected to the detection module 22. The box can be openable to facilitate the installation of the detection module 22. The gas collector 21 is fixedly connected to the outer surface of the shielding layer 523 of the cable connector 520, and it is capable of collecting gas. When gas enters the gas collector 21 and comes into contact with the detection module 22, the detection module 22 can detect the concentration of the labeled gas. The target concentration of the labeled gas is 83%. When the concentration of the labeled gas detected by the detection module 22 exceeds the target threshold, a detection signal is triggered and transmitted outward through the signal transmitter 23.

[0051] The gas collector 21 is provided with a connection structure 212 adapted to the insulation layer 522 of the cable connector 520. During installation, it can be detachably connected to the outer surface of the shielding layer 523 of the cable connector 520 via the connection structure 212. Specifically, the connection structure 212 can be fixed using insulating adhesives such as insulating tape. Of course, the connection structure 212 can also be used with other methods. Figure 4 The insulating clamp shown is snapped onto the outer surface of the shielding layer 523 of the cable connector 520. Of course, the connection structure 212 can also be connected to the cable connector 520 by means of an insulating buckle or other structural form.

[0052] like Figure 5 As shown, the alarm component 3 is disposed on the outer surface of the protective layer 524 of the cable connector 520. The alarm component 3 is wirelessly connected to the detection component 2. When the detection component 2 detects a partial discharge, it triggers a detection signal, and the alarm component 3 can output alarm information corresponding to the detection signal.

[0053] like Figure 5 and Figure 6As shown, the alarm component 3 includes a signal receiver 31 and an alarm module 32 connected in communication. The signal receiver 31 is also connected in communication with the signal transmitter 23 of the detection component 2 to receive detection signals from the detection component 2. The alarm module 32 specifically includes an indicator light device 321 and a sound output device 322. The indicator light device 321 can illuminate the indicator light as an alarm message, and the indicator light can be illuminated for a long time, intermittently, or flashing to make the prompting effect more intuitive and obvious. The sound output device 322 can output sound information as an alarm message, including but not limited to alarm tones, voice, music, etc. The indicator light device 321 and the sound output device 322 can form an alarm message with sound and light structure, so that maintenance personnel can determine which cable joint 520 has partial discharge by visually observing the alarm information of the alarm component 3 at the maintenance site, achieving one-to-one precise positioning, thereby further reducing the difficulty for maintenance personnel to confirm the location of partial discharge.

[0054] like Figure 7 As shown, the remote terminal device 4 is wirelessly connected to the detection component 2. It can receive detection signals from the detection component 2 and display the corresponding information, enabling maintenance personnel to remotely monitor and locate the affected components. In practical applications, the remote terminal device 4 can be any of a mobile phone, computer, or remote monitoring station. Taking a mobile phone as an example, corresponding monitoring software can be installed on the phone. Maintenance personnel can monitor the status of any cable joint 520 in real time through this software. Once a partial discharge occurs in any cable joint 520, the detection component 2 sends a corresponding detection signal to the maintenance personnel's mobile phone. The phone generates a corresponding prompt and displays it through the monitoring software. Maintenance personnel can then promptly obtain information such as the relevant parameters and location of the cable joint 520 experiencing partial discharge, for example, by displaying it on an electronic map, to facilitate appropriate maintenance work.

[0055] The cable partial discharge location detection device 100 in this embodiment can monitor the cable joint 520 for a long time. It can determine the occurrence of partial discharge by the concentration of the marking gas generated by the marking coating 1 and send a corresponding detection signal. Then, it can remind the maintenance personnel through the alarm component 3 and the remote terminal device 4, so that the maintenance personnel can know the accurate location of the partial discharge in time, which facilitates the maintenance operation of the cable joint 520 where partial discharge occurs. It eliminates the need to check each one individually, saving time and manpower, greatly improving maintenance efficiency, and effectively reducing the impact of partial discharge on the operation of cable lines.

[0056] A second aspect of the present invention provides a cable device 500, such as... Figure 8As shown, the cable equipment 500 includes multiple cables 510 and the cable partial discharge location detection device 100 in any embodiment of the first aspect described above. The multiple cables 510 are connected sequentially to form a cable line, and the connection between two adjacent cables 510 forms a cable joint 520. The cable partial discharge location detection device 100 is disposed at the cable joint 520 to detect and locate partial discharge phenomena at the cable joint 520. When partial discharge occurs at the cable joint 520, the marking coating 1 of the cable partial discharge location detection device 100 can generate marking gas under the thermal energy of the partial discharge. The detection component 2 can determine the occurrence of partial discharge by detecting the concentration of the marking gas and send out a corresponding detection signal, enabling maintenance personnel to locate the position of the cable joint 520 where partial discharge occurs through the detection signal, so as to carry out corresponding maintenance work in a timely manner.

[0057] It should be noted that the cable, from the inside out, includes a conductor 521, an insulation layer 522, a shielding layer 523, and a protective layer 524. In practical applications, the cable equipment 500 can be laid underground, and the cable joints 520 can be installed in corresponding cable wells to facilitate installation and maintenance. The number of cables 510 can be set according to specific usage needs. Correspondingly, a cable partial discharge location detection device 100 can be installed at each cable joint 520 to detect and locate each cable joint 520. Of course, depending on the actual situation and usage needs, the cable partial discharge location detection device 100 can also be installed only at some cable joints 520.

[0058] In addition, when laying the cable 510, a marking coating 1 is directly applied to the insulation layer 522 of the cable joint 520. The marking coating 1 can be preserved for a long time to facilitate long-term monitoring. When partial discharge occurs in the cable joint 520, the corresponding detection component 2 can be recycled and reused, which helps to reduce equipment costs.

[0059] The cable device 500 in this embodiment also has all the beneficial effects of the cable partial discharge location detection device 100 of any of the first aspects mentioned above, which will not be repeated here.

[0060] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0061] The block diagrams of the devices, apparatuses, devices, and systems involved in this invention are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it. It should also be noted that in the apparatuses and devices of this invention, the components can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered equivalents of the invention.

[0062] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

[0063] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the invention. Therefore, the invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features of the invention herein.

[0064] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cable partial discharge location and detection device, characterized in that, include: A marking coating, formed of an insulating material, is suitable for application to the outer surface of the insulation layer of a cable joint. The insulating material includes melamine dissolved in glycerol, and the marking coating is capable of generating a marking gas under partial discharge. The marking gas is a non-conductive protective gas, and the marking gas is nitrogen. A detection component is disposed on the outer surface of the shielding layer at the cable joint. The detection component is adapted to detect the concentration of the marking gas to determine whether partial discharge has occurred, and to send out a detection signal corresponding to the partial discharge. The partial discharge is determined to have occurred when the concentration of the marking gas is higher than 83%.

2. The cable partial discharge location and detection device according to claim 1, characterized in that, The detection component includes: A gas collector is fixedly connected to the outer surface of the shielding layer of the cable connector, and the gas collector is adapted to collect gas; A detection module is disposed in the gas collector, the detection module being adapted to detect the concentration of the labeled gas and trigger the detection signal when the concentration of the labeled gas is greater than a target threshold; A signal transmitter is disposed on the gas collector and is communicatively connected to the detection module. The signal transmitter is adapted to send the detection signal outward.

3. The cable partial discharge location and detection device according to claim 2, characterized in that, The gas collector is provided with a connection structure adapted to the shielding layer of the cable connector, and the connection structure is adapted to be connected and fixed to the shielding layer of the cable connector. The connection structure includes any one of an insulating buckle, an insulating clamp, or an insulating adhesive.

4. The cable partial discharge location and detection device according to claim 1, characterized in that, Also includes: An alarm component is disposed on the outer surface of the protective layer of the cable connector. The alarm component is communicatively connected to the detection component to output alarm information based on the detection signal.

5. The cable partial discharge location and detection device according to claim 4, characterized in that, The alarm component includes: A signal receiver is used to receive the detection signal; An alarm module, communicatively connected to the signal receiver, includes: An indicator light device is adapted to illuminate an indicator light according to the detection signal; A sound output device, adapted to output sound information based on the detection signal.

6. The cable partial discharge location and detection device according to claim 1, characterized in that, Also includes: A remote terminal device is wirelessly connected to the detection component, and the remote terminal device is adapted to receive and display the detection signal of the detection component; The detection signal includes the concentration information of the marker gas and the location information of the cable connector.

7. The cable partial discharge location and detection device according to claim 6, characterized in that, The remote terminal device includes any one of a mobile phone, a computer, or a remote monitoring station.

8. A cable device, characterized in that, include: Multiple cables connected in sequence, with the connection between two adjacent cables forming a cable joint; The cable partial discharge location detection device as described in any one of claims 1 to 7 is located at the cable joint.

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