27.5 kv special traction power supply cable based on partial discharge monitoring

Abstract

A 27.5 kv special traction power supply cable based on partial discharge monitoring comprises a traction power supply cable with a stress cone, a partial discharge sensor (2) installed on the stress cone, and a partial discharge online monitor (5) arranged on the partial discharge sensor (2). Partial discharge signals in a cable terminal and an intermediate joint of the 27.5 kV high-voltage railway power transmission cable are collected and processed through the partial discharge on-line monitor (5), the partial discharge signals are processed through the partial discharge on-line monitor (5), fault states of the cable terminal and the intermediate joint of the 27.5 kV high-voltage railway power transmission cable are identified through the partial discharge signals, and the fault states of the cable terminal and the intermediate joint of the 27.5 kV high-voltage railway power transmission cable are identified through the partial discharge on-line monitor (5). The technical problem that the fault of the cable terminal and the intermediate joint of the 27.5 kV high-voltage railway power transmission cable cannot be early warned in advance without an on-line monitoring device is solved, so that the early warning timely performance of the fault of the cable terminal and the intermediate joint of the 27.5 kV high-voltage railway power transmission cable is improved.

Description

Technical Field

[0001] The utility model relates to a 27.5kV special traction power supply cable, in particular to a 27.5kV special traction power supply cable based on partial discharge monitoring. Background Art

[0002] The number of cables used in traction power supply systems has increased significantly. Various quality issues arise during the installation and operation of cables in 27.5kV traction substations on electrified railways. Power supply cables are typically laid directly in burial, through pipes, on tunnel wall mounts, in cable trenches, or along bridges. These installations create complex working environments, make inspections and maintenance difficult, and are prone to failures, even impacting driving safety. The safe operation of power supply cables has become a key challenge affecting the safe and stable operation of traction power supply systems. Strengthening online monitoring of power supply lines is an effective solution. The cable terminals and intermediate joints of 27.5kV high-voltage railway transmission cables are key areas where failures can occur. Therefore, 27.5kV dedicated traction power supply cables based on partial discharge monitoring are important power cable accessories. Existing 27.5kV dedicated traction power supply cables based on partial discharge monitoring can only detect faults after they occur, hindering the timely detection of faults at the cable terminals and intermediate joints of 27.5kV high-voltage railway transmission cables.

[0003] In order to monitor the cable operation status in real time, detect, predict and locate cable faults in time, improve the power supply reliability of the traction power supply system and ensure the safe operation of the train, it is necessary to conduct real-time online monitoring of the traction power supply cable.

[0004] It is used to solve the problems of the existing technology of monitoring fault type and location in an offline manner, which cannot provide early warning of faults and can only be discovered after the fault occurs, and the problems of low efficiency, high cost and low accuracy of manual inspection.

[0005] The utility model uses the technical feature of using partial discharge signals to identify the fault status of the cable terminals and intermediate joints of 27.5kV high-voltage railway transmission cables, and conducts effective exploration and research on the technical problem that there is no online monitoring device and it is impossible to provide early warning of the faults of the cable terminals and intermediate joints of 27.5kV high-voltage railway transmission cables.

[0006] The statements here only provide background technology related to the present utility model and do not necessarily constitute prior art. The application technical solution of the present invention is made based on the technical briefing document provided by the applicant on April 22, 2024, which solves actual technical problems in the work process, and the existing technical problems, technical features and technical effects in the similar patent documents and background technology obtained through retrieval. Summary of the Invention

[0007] The object of the utility model is a 27.5kV special traction power supply cable based on partial discharge monitoring.

[0008] In order to overcome the above technical shortcomings, the purpose of the utility model is to provide a 27.5kV dedicated traction power supply cable based on partial discharge monitoring, thereby improving the timely warning performance of faults occurring at the cable terminals and intermediate joints of the 27.5kV high-voltage railway transmission cable.

[0009] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: comprising a traction power supply cable with a stress cone, a partial discharge sensor installed on the stress cone, and a partial discharge online monitor arranged on the partial discharge sensor.

[0010] Due to the design of the traction power supply cable, partial discharge sensor and partial discharge online monitor, 27.5kV high-voltage railway power transmission is realized through the traction power supply cable, the partial discharge signal in the cable terminal and the intermediate joint of the 27.5kV high-voltage railway transmission cable is collected and processed through the partial discharge sensor, and the partial discharge online monitor is used to process the partial discharge signal, and the fault status of the cable terminal and the intermediate joint of the 27.5kV high-voltage railway transmission cable is identified by the partial discharge signal, thereby solving the technical problem that the cable terminal and the intermediate joint of the 27.5kV high-voltage railway transmission cable cannot be warned in advance due to the lack of online monitoring devices. Therefore, the timely warning performance of the fault of the cable terminal and the intermediate joint of the 27.5kV high-voltage railway transmission cable is improved.

[0011] The utility model is designed to connect a partial discharge sensor and a partial discharge online monitor to each other in a manner that a partial discharge signal identifies a fault state of a cable terminal and an intermediate joint of a 27.5kV high-voltage railway transmission cable.

[0012] The utility model is designed to connect a partial discharge sensor with a partial discharge online monitor in a manner of collecting and processing partial discharge signals in a cable terminal and an intermediate joint of a 27.5kV high-voltage railway transmission cable.

[0013] The technical effects of the above three technical solutions are: highlighting the technical characteristics of using partial discharge signals to identify fault conditions in cable terminals and intermediate joints of 27.5kV high-voltage railway transmission cables, and introducing their application in the technical field of 27.5kV dedicated traction power supply cables based on partial discharge monitoring.

[0014] The utility model is designed to further include a first accessory device, and the first accessory device is arranged between the partial discharge sensor and the partial discharge online monitor. The first accessory device is arranged to include a signal collector and an optical fiber remote module.

[0015] The utility model is designed to further include a second accessory device, and the second accessory device is arranged on the partial discharge online monitor, and the second accessory device is arranged as a data processor.

[0016] The utility model is designed to further include a third accessory device, and the third accessory device is arranged on the partial discharge sensor, and the third accessory device is arranged as a bracket.

[0017] The technical effect of the above technical solution is that it realizes the integrated installation of other components and expands the technical effect of the utility model.

[0018] The utility model is designed to provide a bracket on the stress cone of the cable terminal and the stress cone of the intermediate joint of a 27.5kV high-voltage railway transmission cable, a partial discharge sensor is provided on the bracket, and a signal collector and an optical fiber remote module are respectively provided between the partial discharge sensor and the partial discharge online monitor, and a data processor is provided on the partial discharge online monitor.

[0019] The technical effect of the above technical solution is that the basic technical solution of the utility model is formed by the bracket, partial discharge sensor, signal collector, optical fiber remote module, partial discharge online monitor and data processor, which solves the technical problem of the utility model.

[0020] The utility model is designed such that the partial discharge sensor is arranged to be connected to the bracket in an internal manner and the upper end of the partial discharge sensor is arranged to be connected to the bracket in an embedded manner, the output interface of the partial discharge sensor is arranged to be connected to the signal collector through a signal transmission line, and the partial discharge sensors are respectively arranged to be distributed corresponding to the cable terminals and the intermediate joints of the 27.5kV high-voltage railway transmission cable.

[0021] The utility model is designed to set the spectrum range of the partial discharge sensor to 0-300MHz and the sensitivity of the partial discharge sensor to 1mV, and set the distance between the partial discharge sensor and the stress cone of the cable terminal and the stress cone of the intermediate joint of the 27.5kV high-voltage railway transmission cable to 10-30cm.

[0022] The utility model designs a partial discharge online monitor, wherein the model is set as an online partial discharge detector, the input interface of the partial discharge online monitor is set to be connected with an optical fiber remote module, and the output interface of the partial discharge online monitor is set to be connected with a data processor.

[0023] The technical effects of the above three technical solutions are: analyzing the partial discharge signal to obtain a spectrum diagram, thereby determining the type of fault that has occurred.

[0024] The utility model is designed that the model of the signal collector is set as a micro USB signal collector, the input interface of the signal collector is set to be connected to the partial discharge sensor, and the output interface of the signal collector is set to be connected to the optical fiber remote module.

[0025] The utility model is designed in which the model of the optical fiber remote module is set to TRICONEX 4201 optical fiber remote module programmable logic controller and the input interface of the optical fiber remote module is set to be connected to a signal collector, and the output interface of the optical fiber remote module is set to be connected to a partial discharge online monitor.

[0026] The technical effects of the above two technical solutions are: achieving real-time collection and periodic transmission of partial discharge signals.

[0027] The utility model is designed such that the data processor is arranged as a background computer and the input interface of the data processor is arranged to be connected with the partial discharge online monitor.

[0028] The technical effect of the above technical solution is that the obtained fault results can be stored.

[0029] The utility model is designed to respectively arrange a signal transmission line, Lora or 4G wireless transmission between the partial discharge sensor and the signal collector, the number of channels of the signal collector is set to 1-32, the data upload cycle of the optical fiber remote module is set to 3min-1h, and Lora or 4G wireless transmission is respectively arranged between the partial discharge online monitor and the data processor.

[0030] The technical effect of the above technical solution is that remote transmission of signals is achieved.

[0031] The utility model is designed, the bracket is provided to include a frame portion, a hoop plate portion I, a hoop plate portion II and a screw portion, and the lower portion of the inner end face of the frame portion is respectively provided to be connected to the stress cone of the cable terminal and the stress cone of the intermediate joint of the 27.5kV high-voltage railway power transmission cable, the lower portion of the outer end face of the frame portion is respectively provided to be contact-connected with the inner wall of the arc-shaped groove of the hoop plate portion I and the inner wall of the arc-shaped groove of the hoop plate portion II, and the outer side of the inner end face of the hoop plate portion I is provided to be contact-connected with the outer side of the inner end face of the hoop plate portion II, the inner end head of the screw portion is provided to be through-connected with the end head of the hoop plate portion I, and the inner end head of the screw portion is provided to be connected to the hoop The end of the plate part II is threadedly connected and the flange of the screw part is configured to be contact-connected with the outer end surface of the hoop plate part I, the upper part of the inner end surface of the frame part is configured to be connected with the local discharge sensor and the frame part is configured to be a block of polytetrafluoroethylene, ABS or nylon, the hoop plate part I and the hoop plate part II are respectively configured to be epoxy glass fiber reinforced plastic and SMC molding plastic sheet bodies with arc-shaped grooves on the inner end surfaces and a through-hole body is provided on the end of the hoop plate part I, a built-in nut is provided at the end of the hoop plate part II and the screw part is configured to be a hexagonal bolt, and the through-hole body of the hoop plate part I and the built-in nut of the hoop plate part II are respectively configured to be connected with the screw part.

[0032] The utility model designs that a receiving groove body I is arranged at the upper part of the inner end face of the frame part, and a receiving groove body II is arranged at the upper end face part of the frame part. A receiving groove body III is arranged at the lower end face part of the frame part, and the receiving groove body I is arranged to be connected with the partial discharge sensor in a receiving manner. The inner wall of the horizontal part of the receiving groove body I is arranged to be connected with the partial discharge sensor, and the receiving groove body II is arranged to be connected with the upper cover part. The receiving groove body III is arranged to be connected with the lower cover part, and the upper cover part and the lower cover part are respectively arranged as circular sheet-like bodies with annular flange bodies at their inner end face parts. The receiving groove body I is arranged as a U-shaped blind hole, and the receiving groove body II and the receiving groove body III are respectively arranged as U-shaped groove bodies.

[0033] The technical effects of the above two technical solutions are as follows: It realizes the circumferential installation of the partial discharge sensor on the stress cone and realizes the installation of the partial discharge sensor in a closed area.

[0034] The utility model designs that the partial discharge sensor, the signal collector, the optical fiber remote module and the partial discharge on-line monitor are arranged to be distributed in the manner of on-line monitoring of the partial discharge signal, and the partial discharge sensor, the signal collector, the optical fiber remote module and the partial discharge on-line monitor and the data processor are arranged to be distributed in the manner of data storage. The partial discharge sensor, the signal collector, the optical fiber remote module and the partial discharge on-line monitor and the support are arranged to be distributed in the manner of annular support.

[0035] The utility model designs that at least two partial discharge sensors are arranged between the support and the cable terminals and intermediate joints of the 27.5 kV high-voltage railway transmission cable.

[0036] In this technical solution, the partial discharge sensor and the partial discharge on-line monitor are basic components and also the necessary technical features of the utility model. The support, the signal collector, the optical fiber remote module and the data processor are functional components and are the features for realizing other technical effects of the utility model. The design of these technical features such as the frame part, the hoop plate part I, the hoop plate part II, the screw part, the receiving groove body I, the receiving groove body II and the receiving groove body III conforms to the technical features of the Patent Law and its implementation regulations.

[0037] In this technical solution, the traction power supply cable refers to the 27.5 kV high-voltage railway transmission cable.

[0038] In this technical solution, the partial discharge signal identification for indicating the fault state of the cable terminals and intermediate joints of the 27.5 kV high-voltage railway transmission cable is realized by the partial discharge sensor and the partial discharge on-line monitor.

[0039] In this technical solution, the partial discharge sensor and partial discharge online monitor that use partial discharge signals to identify fault conditions at the cable terminals and intermediate joints of a 27.5kV high-voltage railway transmission cable are important technical features. In the technical field of 27.5kV dedicated traction power supply cables based on partial discharge monitoring, this solution is novel, creative, and practical. The terms in this technical solution can all be explained and understood using patent literature in this technical field. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 This is a schematic diagram of the utility model.

[0042] Figure 2 is a schematic structural diagram of the bracket 1,

[0043] Figure 3 Schematic diagram of the connection between the bracket 1 and the partial discharge sensor 2.

[0044] Bracket-1, partial discharge sensor-2, signal collector-3, optical fiber remote module-4, partial discharge online monitor-5, data processor-6, frame part-11, clamping plate part I-12, clamping plate part II-13, screw part-14, accommodating tank body I-15, accommodating tank body II-16, accommodating tank body III-17. DETAILED DESCRIPTION

[0045] According to the Examination Guidelines, terms such as “having”, “including” and “comprising” used in the present invention should be understood as not precluding the existence or addition of one or more other elements or their combinations.

[0046] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0048] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. In addition, unless otherwise specified, the equipment and materials used in the following examples are commercially available. If the processing conditions are not clearly stated, please refer to the purchased product manual or follow the conventional methods in the field.

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] Figure 1 This is the first embodiment of the utility model, which is described in detail with reference to the accompanying drawings. It includes a bracket 1, a partial discharge sensor 2, a signal collector 3, an optical fiber remote module 4, a partial discharge online monitor 5 and a data processor 6. The bracket 1 is arranged on the stress cone of the cable terminal and the stress cone of the intermediate joint of the 27.5kV high-voltage railway transmission cable, the partial discharge sensor 2 is arranged on the bracket 1, and the signal collector 3 and the optical fiber remote module 4 are respectively arranged between the partial discharge sensor 2 and the partial discharge online monitor 5, and the data processor 6 is arranged on the partial discharge online monitor 5.

[0051] In this embodiment, the bracket 1 is provided to include a frame portion 11, a hoop plate portion I 12, a hoop plate portion II 13, and a screw rod portion 14. The lower part of the inner end face of the frame portion 11 is respectively provided to be connected to the stress cones of the cable terminal of the 27.5 kV high-voltage railway transmission cable and the stress cone of the intermediate joint. The lower part of the outer end face of the frame portion 11 is respectively provided to be in contact connection with the inner wall of the arc-shaped groove of the hoop plate portion I 12 and the inner wall of the arc-shaped groove of the hoop plate portion II 13. The outer side portion of the inner end face of the hoop plate portion I 12 is provided to be in contact connection with the outer side portion of the inner end face of the hoop plate portion II 13. The inner end head of the screw rod portion 14 is provided to be in through connection with the end head of the hoop plate portion I 12. The inner end head of the screw rod portion 14 is provided to be in threaded connection with the end head of the hoop plate portion II 13. The flange body of the screw rod portion 14 is provided to be in contact connection with the outer end face portion of the hoop plate portion I 12. The upper part of the inner end face of the frame portion 11 is provided to be connected to the partial discharge sensor 2. The frame portion 11 is provided to be a block body made of polytetrafluoroethylene, ABS or nylon. The hoop plate portion I 12 and the hoop plate portion II 13 are respectively provided to be epoxy glass fiber reinforced plastics and SMC molded plastic sheet bodies with arc-shaped groove bodies on their inner end face portions. A through-hole body is provided on the end head of the hoop plate portion I 12. An internal nut is provided on the end head of the hoop plate portion II 13. The screw rod portion 14 is provided to be a hexagonal bolt. The through-hole body of the hoop plate portion I 12 and the internal nut of the hoop plate portion II 13 are respectively provided to be connected to the screw rod portion 14.

[0052] Through the bracket 1, a support connection point for the partial discharge sensor 2 is formed. The connection with the partial discharge sensor 2 is achieved by the frame portion 11. The installation of the frame portion 11 on the stress cones of the cable terminal of the 27.5 kV high-voltage railway transmission cable and the stress cone of the intermediate joint is achieved by the hoop plate portion I 12, the hoop plate portion II 13, and the screw rod portion 14. Its technical purpose is to be used as a support carrier for the partial discharge sensor 2.

[0053] In this embodiment, a receiving groove body I 15 is provided on the upper part of the inner end face of the frame portion 11, a receiving groove body II 16 is provided on the upper end face portion of the frame portion 11, a receiving groove body III 17 is provided on the lower end face portion of the frame portion 11. The receiving groove body I 15 is provided to be in receiving connection with the partial discharge sensor 2. The inner wall of the horizontal part of the receiving groove body I 15 is provided to be connected to the partial discharge sensor 2. The receiving groove body II 16 is provided to be connected to the upper cover portion. The receiving groove body III 17 is provided to be connected to the lower cover portion. The upper cover portion and the lower cover portion are respectively provided to be circular ring sheet bodies with annular flange bodies on their inner end face portions. The receiving groove body I 15 is provided to be a U-shaped blind hole. The receiving groove body II 16 and the receiving groove body III 17 are respectively provided to be U-shaped groove bodies.

[0054] Its technical purpose is to achieve the built-in installation of the partial discharge sensor 2.

[0055] In this embodiment, the partial discharge sensor 2 is configured to be internally connected to the bracket 1 and the upper end of the partial discharge sensor 2 is configured to be embedded in the bracket 1, the output interface of the partial discharge sensor 2 is configured to be connected to the signal collector 3 through a signal transmission line and the partial discharge sensor 2 is respectively configured to be distributed corresponding to the cable terminal and the intermediate joint of the 27.5kV high-voltage railway transmission cable.

[0056] The partial discharge sensor 2 forms a support connection point between the bracket 1 and the signal collector 3. The partial discharge sensor 2 realizes the connection with the bracket 1 and the signal collector 3. Its technical purpose is to serve as one of the components for collecting partial discharge signals in the cable terminals and intermediate joints of 27.5kV high-voltage railway transmission cables.

[0057] In this embodiment, the spectrum range of the partial discharge sensor 2 is set to 0-300 MHz and the sensitivity of the partial discharge sensor 2 is 1 mV, and the distance between the partial discharge sensor 2 and the stress cone of the cable terminal and the stress cone of the intermediate joint of the 27.5 kV high-voltage railway transmission cable is set to 10-30 cm.

[0058] The technical purpose is to improve the acquisition accuracy of partial discharge signals in cable terminals and intermediate joints of 27.5kV high-voltage railway transmission cables.

[0059] In this embodiment, the model of the signal collector 3 is set to be a micro USB signal collector and the input interface of the signal collector 3 is set to be connected to the partial discharge sensor 2, and the output interface of the signal collector 3 is set to be connected to the optical fiber remote module 4.

[0060] The signal collector 3 forms a supporting connection point for the partial discharge sensor 2 and the optical fiber remote module 4. The signal collector 3 realizes the connection with the partial discharge sensor 2 and the optical fiber remote module 4. Its technical purpose is to serve as the second component for collecting partial discharge signals in the cable terminals and intermediate joints of 27.5kV high-voltage railway transmission cables.

[0061] In this embodiment, the model of the optical fiber remote module 4 is set to TRICONEX 4201 optical fiber remote module programmable logic controller and the input interface of the optical fiber remote module 4 is set to be connected to the signal collector 3, and the output interface of the optical fiber remote module 4 is set to be connected to the partial discharge online monitor 5.

[0062] Through the optical fiber remote module 4, a support connection point is formed for the signal collector 3 and the partial discharge online monitor 5. The optical fiber remote module 4 realizes the connection with the signal collector 3 and the partial discharge online monitor 5. Its technical purpose is to serve as a component for transmitting partial discharge signals.

[0063] In this embodiment, the model of the partial discharge online monitor 5 is set to be an online partial discharge detector and the input interface of the partial discharge online monitor 5 is set to be connected to the optical fiber remote module 4, and the output interface of the partial discharge online monitor 5 is set to be connected to the data processor 6.

[0064] The partial discharge online monitor 5 forms a supporting connection point for the optical fiber remote module 4 and the data processor 6. The partial discharge online monitor 5 realizes the connection with the optical fiber remote module 4 and the data processor 6. Its technical purpose is to serve as a component for data processing of partial discharge signals.

[0065] In this embodiment, the data processor 6 is configured as a background computer and the input interface of the data processor 6 is configured to be connected to the partial discharge online monitor 5 .

[0066] A supporting connection point for the partial discharge online monitor 5 is formed by the data processor 6, and the connection with the partial discharge online monitor 5 is realized by the data processor 6. Its technical purpose is to serve as a component for storing the data processing results of the partial discharge online monitor 5.

[0067] In this embodiment, a signal transmission line, Lora or 4G wireless transmission are respectively arranged between the partial discharge sensor 2 and the signal collector 3, the number of channels of the signal collector 3 is set to 1-32, the data upload cycle of the optical fiber remote module 4 is set to 3min-1h, and Lora or 4G wireless transmission are respectively arranged between the partial discharge online monitor 5 and the data processor 6.

[0068] The technical purpose is to improve the transmission accuracy of partial discharge signals and data results.

[0069] In this embodiment, the partial discharge sensor 2 and the signal collector 3, the optical fiber remote module 4 and the partial discharge online monitor 5 are arranged to be distributed in a manner of online monitoring of partial discharge signals, and the partial discharge sensor 2, the signal collector 3, the optical fiber remote module 4 and the partial discharge online monitor 5 and the data processor 6 are arranged to be distributed in a manner of data storage. The partial discharge sensor 2, the signal collector 3, the optical fiber remote module 4 and the partial discharge online monitor 5 and the bracket 1 are arranged to be distributed in a ring-shaped support manner, and at least two partial discharge sensors 2 are arranged between the bracket 1 and the cable terminal and the intermediate joint of the 27.5kV high-voltage railway transmission cable.

[0070] In one supporting example of the first embodiment of the present invention, the distance between the partial discharge sensor 2 and the stress cone of the cable terminal and the stress cone of the intermediate joint of the 27.5 kV high-voltage railway transmission cable is set to 10 cm.

[0071] In a second supporting example of the first embodiment of the present utility model, the distance between the partial discharge sensor 2 and the stress cone of the cable terminal and the stress cone of the intermediate joint of the 27.5kV high-voltage railway transmission cable is set to 30cm.

[0072] In a third supporting example of the first embodiment of the present utility model, the distance between the partial discharge sensor 2 and the stress cone of the cable terminal and the stress cone of the intermediate joint of the 27.5kV high-voltage railway transmission cable is set to 20cm.

[0073] The method of using this embodiment is as follows: install the upper cover and the lower cover on the 27.5kV high-voltage railway transmission cable, place the partial discharge sensor 2 in the accommodating tank body Ⅰ15, connect the upper end of the partial discharge sensor 2 to the inner wall of the transverse part of the accommodating tank body Ⅰ15, place the lower part of the inner end surface of the frame part 11 on the stress cone of the cable terminal and the stress cone of the intermediate joint of the 27.5kV high-voltage railway transmission cable, and place the arc-shaped groove body of the hoop plate part Ⅰ12 and the arc-shaped groove body of the hoop plate part Ⅱ13 on the frame part 1 respectively. 1, place the screw part 14 into the through-hole body of the hoop plate part I 12, rotate the screw part 14 in the built-in nut of the hoop plate part II 13, so that the flange of the screw part 14 acts on the outer end surface of the hoop plate part I 12, install the annular flange body of the upper cover part in the receiving groove body II 16, and install the annular flange body of the lower cover part in the receiving groove body III 17, thereby installing the partial discharge sensor 2 on the cable terminal and the intermediate joint of the 27.5kV high-voltage railway transmission cable.

[0074] The partial discharge sensor 2 and signal collector 3 collect partial discharge signals from the cable terminals and intermediate joints of a 27.5kV high-voltage railway transmission cable. The optical fiber remote module 4 periodically transmits the collected partial discharge signals to the partial discharge online monitor 5. The partial discharge online monitor 5 performs spectrum processing on the partial discharge signals. Based on the different spectrums emitted by the discharge signals caused by different insulation defects, the fault type (such as sharp tip, internal air gap, suspended conductive particles, and surface flashover) is diagnosed. The data processor 6 remotely stores the data from the partial discharge online monitor 5.

[0075] When verifying the present invention, the inventor abandoned the existing technical feature that there was no online monitoring device and it was impossible to give early warning of the failure of the cable terminal and the intermediate joint of the 27.5kV high-voltage railway transmission cable. First, the inventor proposed a technical feature of identifying the fault status of the cable terminal and the intermediate joint of the 27.5kV high-voltage railway transmission cable by the partial discharge signal, and obtained the first unexpected technical effect: it realized the online monitoring of the working status of the cable terminal and the intermediate joint of the 27.5kV high-voltage railway transmission cable by the electrical signal, and obtained the second unexpected technical effect: it realized the online monitoring of the working status of the cable terminal and the intermediate joint of the 27.5kV high-voltage railway transmission cable by the electrical signal, and obtained the second unexpected technical effect: it realized the online monitoring of the working status of the cable terminal and the intermediate joint of the 27.5kV high-voltage railway transmission cable by the fault type identified by the spectrum diagram of the discharge signal. The rapid determination of faults at the cable terminals and intermediate joints of the cable improves the rapid maintenance effect of the cable terminals and intermediate joints, and obtains the third unexpected technical effect: the periodic transmission of partial discharge signals is realized, the periodic change of the spectrum diagram of the discharge signal is realized, and the accuracy of determining the fault type is improved. The fourth unexpected technical effect is obtained: multi-point collection of discharge signals at the cable terminals and intermediate joints of the 27.5kV high-voltage railway transmission cable is realized, and the accuracy of collecting partial discharge signals is improved. The fifth unexpected technical effect is obtained: the sealed space installation of the partial discharge sensor 2 is realized, and the service life of the partial discharge sensor 2 is extended.

[0076] In a second embodiment of the present invention, the partial discharge sensor 2 and the partial discharge online monitor 5 are interconnected in such a way that the partial discharge signal identifies the fault state of the cable terminal and the intermediate joint of the 27.5kV high-voltage railway transmission cable.

[0077] In this embodiment, the partial discharge sensor 2 is connected to the partial discharge online monitor 5 in a manner of collecting and processing partial discharge signals in the cable terminals and intermediate joints of the 27.5 kV high-voltage railway transmission cable.

[0078] In this embodiment, a first accessory device is further included and is arranged between the partial discharge sensor 2 and the partial discharge online monitor 5 . The first accessory device is configured to include a signal collector 3 and an optical fiber remote module 4 .

[0079] In this embodiment, a second accessory device is further included and is provided on the partial discharge online monitor 5 , and the second accessory device is configured as a data processor 6 .

[0080] In this embodiment, a third accessory device is further included and is arranged on the partial discharge sensor 2 , and the third accessory device is arranged as a bracket 1 .

[0081] The second embodiment of the present invention is based on the first embodiment.

[0082] The utility model has the following features:

[0083] 1. Due to the design of the traction power supply cable, the partial discharge sensor 2 and the partial discharge online monitor 5, 27.5 kV high-voltage railway power transmission is achieved through the traction power supply cable. The partial discharge sensor 2 is used to collect and process the partial discharge signals in the cable terminals and intermediate joints of the 27.5 kV high-voltage railway transmission cable. The partial discharge online monitor 5 is used to process the partial discharge signals, and the partial discharge signals are used to identify the fault status of the cable terminals and intermediate joints of the 27.5 kV high-voltage railway transmission cable. This solves the technical problem of not being able to provide early warning of faults of the cable terminals and intermediate joints of the 27.5 kV high-voltage railway transmission cable due to the lack of an online monitoring device. Therefore, the timely warning performance of faults of the cable terminals and intermediate joints of the 27.5 kV high-voltage railway transmission cable is improved.

[0084] 2. Due to the design of the signal collector 3 and the optical fiber remote module 4, the partial discharge signal can be periodically transmitted to the partial discharge online monitor 5.

[0085] 3. Due to the design of the data processor 6, the processing results of the local discharge online monitor 5 can be stored and analyzed.

[0086] 4. Due to the design of the bracket 1, the partial discharge sensor 2 can be installed.

[0087] 5. Since the design limits the numerical range of the structural shape, the numerical range is the technical feature in the technical solution of the utility model, and is not a technical feature calculated by formula or obtained through a limited number of tests. Tests have shown that the technical feature of this numerical range has achieved good technical effects.

[0088] 6. Due to the design of the technical features of the present invention, the effects of the individual and combined technical features have been shown through experiments to show that the performance indicators of the present invention are at least 1.7 times that of the existing performance indicators, and the evaluation shows that the present invention has a good market value.

[0089] There are other technical features connected to the partial discharge sensor 2 and the partial discharge online monitor 5 that are used to identify the fault status of the cable terminal and the intermediate joint of the 27.5kV high-voltage railway transmission cable by the partial discharge signal, which are all embodiments of the present utility model, and the various technical features of the above-mentioned embodiments can be combined arbitrarily. In order to meet the requirements of the Patent Law, the Patent Implementing Rules and the Examination Guidelines, all possible combinations of the various technical features in the above-mentioned embodiments will no longer be described.

[0090] Therefore, in the technical field of 27.5kV dedicated traction power supply cable based on partial discharge monitoring, all technical contents including a traction power supply cable with a stress cone, a partial discharge sensor 2 installed on the stress cone, and a partial discharge online monitor 5 arranged on the partial discharge sensor 2 are within the protection scope of this utility model.

Claims

1. A 27.5kV dedicated traction power supply cable based on partial discharge monitoring, characterized by: The invention comprises a traction power supply cable having a stress cone, a partial discharge sensor (2) installed on the stress cone, and a partial discharge online monitor (5) arranged on the partial discharge sensor (2). It also includes a first accessory device, which is arranged between the partial discharge sensor (2) and the partial discharge online monitor (5). The first accessory device is configured to include a signal collector (3) and an optical fiber remote module (4). It also includes a second accessory device and the second accessory device is arranged on the partial discharge online monitor (5), and the second accessory device is arranged as a data processor (6). It also includes a third accessory device, and the third accessory device is arranged on the partial discharge sensor (2), and the third accessory device is arranged as a bracket (1). A bracket (1) is provided on the stress cone of a cable terminal and the stress cone of an intermediate joint of a 27.5 kV high-voltage railway transmission cable; a partial discharge sensor (2) is provided on the bracket (1); a signal collector (3) and an optical fiber remote module (4) are provided between the partial discharge sensor (2) and an online partial discharge monitor (5), respectively; and a data processor (6) is provided on the online partial discharge monitor (5).

2. The 27.5kV dedicated traction power supply cable based on partial discharge monitoring according to claim 1 is characterized by: The partial discharge sensor (2) and the partial discharge online monitor (5) are connected to each other in such a way that the partial discharge signal identifies the fault state of the cable terminal and the intermediate joint of the 27.5kV high-voltage railway transmission cable.

3. The 27.5kV dedicated traction power supply cable based on partial discharge monitoring according to claim 2 is characterized by: The partial discharge sensor (2) is connected to the partial discharge online monitor (5) in a manner of collecting and processing partial discharge signals in the cable terminal and the intermediate joint of a 27.5kV high-voltage railway transmission cable.

4. The 27.5kV dedicated traction power supply cable based on partial discharge monitoring according to claim 1 is characterized by: The partial discharge sensor (2) is configured to be connected to the bracket (1) in a built-in manner, and the upper end of the partial discharge sensor (2) is configured to be connected to the bracket (1) in an embedded manner. The output interface of the partial discharge sensor (2) is configured to be connected to the signal collector (3) via a signal transmission line, and the partial discharge sensor (2) is configured to be distributed corresponding to the cable terminal and the intermediate joint of the 27.5 kV high-voltage railway transmission cable. Alternatively, the spectrum range of the partial discharge sensor (2) is set to 0-300 MHz and the sensitivity of the partial discharge sensor (2) is 1 mV, and the distance between the partial discharge sensor (2) and the stress cone of the cable terminal and the stress cone of the intermediate joint of the 27.5 kV high-voltage railway transmission cable is set to 10-30 cm.

5. The 27.5kV dedicated traction power supply cable based on partial discharge monitoring according to claim 1 is characterized by: The model of the partial discharge online monitor (5) is set to be an online partial discharge detector, and the input interface of the partial discharge online monitor (5) is set to be connected to the optical fiber remote module (4), and the output interface of the partial discharge online monitor (5) is set to be connected to the data processor (6).

6. The 27.5kV dedicated traction power supply cable based on partial discharge monitoring according to claim 1 is characterized by: The model of the signal collector (3) is set to be a micro USB signal collector and the input interface of the signal collector (3) is set to be connected to the partial discharge sensor (2), and the output interface of the signal collector (3) is set to be connected to the optical fiber remote module (4). Alternatively, the model of the optical fiber remote module (4) is set to TRICONEX 4201 optical fiber remote module programmable logic controller and the input interface of the optical fiber remote module (4) is set to be connected to the signal collector (3), and the output interface of the optical fiber remote module (4) is set to be connected to the partial discharge online monitor (5). Alternatively, the data processor (6) is configured as a background computer and the input interface of the data processor (6) is configured to be connected to the partial discharge online monitor (5). Alternatively, a signal transmission line, Lora or 4G wireless transmission are respectively provided between the partial discharge sensor (2) and the signal collector (3), the number of channels of the signal collector (3) is set to 1-32, the data upload cycle of the optical fiber remote module (4) is set to 3 minutes to 1 hour, and Lora or 4G wireless transmission are respectively provided between the partial discharge online monitor (5) and the data processor (6).

7. The 27.5kV dedicated traction power supply cable based on partial discharge monitoring according to claim 1 is characterized by: The bracket (1) is configured to include a frame portion (11), a hoop plate portion I (12), a hoop plate portion II (13) and a screw portion (14), and the lower portion of the inner end face of the frame portion (11) is respectively configured to be connected to the stress cone of the cable terminal and the stress cone of the intermediate joint of the 27.5 kV high-voltage railway power transmission cable, the lower portion of the outer end face of the frame portion (11) is respectively configured to be contact-connected to the inner wall of the arc-shaped groove of the hoop plate portion I (12) and the inner wall of the arc-shaped groove of the hoop plate portion II (13), and the outer portion of the inner end face of the hoop plate portion I (12) is configured to be contact-connected to the outer portion of the inner end face of the hoop plate portion II (13), the inner end head of the screw portion (14) is configured to be through-connected to the end head of the hoop plate portion I (12), and the inner end head of the screw portion (14) is configured to be connected to the hoop plate portion II (13). 3) is threadedly connected at the end and the flange body of the screw part (14) is configured to be contact-connected with the outer end face portion of the hoop plate part I (12), the upper portion of the inner end face of the frame part (11) is configured to be connected with the local discharge sensor (2) and the frame part (11) is configured to be a block body of polytetrafluoroethylene, ABS or nylon, the hoop plate part I (12) and the hoop plate part II (13) are respectively configured to be epoxy glass fiber reinforced plastic and SMC molded plastic sheet bodies with arc-shaped groove bodies at the inner end face portions, and a through-hole body is configured at the end of the hoop plate part I (12), a built-in nut is configured at the end of the hoop plate part II (13) and the screw part (14) is configured to be a hexagonal bolt, the through-hole body of the hoop plate part I (12) and the built-in nut of the hoop plate part II (13) are respectively configured to be connected with the screw part (14), Alternatively, a receiving groove body I (15) is provided at the upper part of the inner end face of the rack part (11), and a receiving groove body II (16) is provided at the upper end face part of the rack part (11). A receiving groove body III (17) is provided at the lower end face part of the rack part (11). The receiving groove body I (15) is arranged to be connected to the partial discharge sensor (2) in a receiving manner. The inner wall of the horizontal part of the receiving groove body I (15) is arranged to be connected to the partial discharge sensor (2). The receiving groove body II (16) is arranged to be connected to the upper cover part. The receiving groove body III (17) is arranged to be connected to the lower cover part. The upper cover part and the lower cover part are respectively arranged as circular ring sheet bodies with annular flange bodies at their inner end face parts. The receiving groove body I (15) is arranged as a C-shaped blind hole, and the receiving groove body II (16) and the receiving groove body III (17) are respectively arranged as C-shaped groove bodies.

8. The 27.5kV dedicated traction power supply cable based on partial discharge monitoring according to any one of claims 1 to 7, characterized in that: The partial discharge sensor (2), the signal collector (3), the optical fiber remote module (4) and the partial discharge on-line monitor (5) are arranged to be distributed in the manner of on-line monitoring of partial discharge signals. The partial discharge sensor (2), the signal collector (3), the optical fiber remote module (4) and the partial discharge on-line monitor (5) and the data processor (6) are arranged to be distributed in the manner of data storage. The partial discharge sensor (2), the signal collector (3), the optical fiber remote module (4) and the partial discharge on-line monitor (5) and the support (1) are arranged to be distributed in the manner of annular support. Alternatively, at least two partial discharge sensors (2) are arranged between the support (1) and the cable terminals and intermediate joints of the 27.5 kV high-voltage railway transmission cable.

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