Fault monitoring and early warning system for high-voltage cable joint

Abstract

The utility model discloses a fault monitoring and early warning system for a high-voltage cable joint, which relates to the technical field of high-voltage cable joint monitoring, aims to solve the problem of inaccurate monitoring of the conventional monitoring device, and comprises a plurality of intermediate joints for connecting high-voltage cables and fault monitoring devices arranged on the peripheries of the intermediate joints, the plurality of fault monitoring devices are connected through temperature measurement optical fibers, one of the fault monitoring devices is connected with the monitoring device, the fault monitoring device comprises a shell, a traveling wave sensor and a temperature measurement assembly, the shell is detachably arranged on the periphery of the high-voltage cable and the middle connector, the traveling wave sensor is detachably arranged on the periphery of the shell, and the temperature measurement assembly is arranged on the periphery of the shell. The traveling wave sensor is used for monitoring traveling wave signals of the high-voltage cable in real time, the optical fiber temperature sensor is arranged in the shell, the optical fiber temperature sensor is in signal connection with the traveling wave sensor, and the optical fiber temperature sensor is used for monitoring temperature signals of the intermediate joint in real time and sending the monitored temperature signals and the received traveling wave signals to the monitoring device.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage cable joint monitoring, and more specifically, to a fault monitoring and early warning system for high-voltage cable joints. Background Art

[0002] In recent years, with the increase in the construction and operation of large-scale ground photovoltaic power stations, there have been many problems with high-voltage cables during the operation and maintenance of power stations. Since the collector lines of ground photovoltaic power stations generally use high-voltage cables and the distance of a single collector line is relatively long, due to the construction difficulty and cost control, multiple high-voltage cables are connected in series, resulting in a large number of intermediate joints of high-voltage cables, which increases the potential for faults in later operation and maintenance.

[0003] According to the technical analysis of cable joint faults during the operation of relevant power stations, the intermediate joints of high-voltage cables are the weakest links in the line, and more than 90% of cable operation faults occur at the positions of cable intermediate joints. The intermediate joints of cables are prone to aging problems due to factors such as poor crimping of wire cores leading to heating, long-term overloading operation leading to heating, insulation dampness, chemical corrosion, and high ambient temperature. The insulation reduction of cable joints leads to breakdown, which may cause grounding or short-circuit accidents of cables, and even cause the burning of cables, fires, or large-scale power outages, resulting in great losses to the power generation of power stations. Existing on-line monitoring devices can monitor whether intermediate joints fail, but they are isolated, have interference signals, have problems with inaccurate monitoring, are prone to false judgments of fault early warnings, result in power outage maintenance work due to false fault reports, and also cause economic losses due to power outage maintenance.

[0004] Therefore, how to solve the problem of inaccurate monitoring of existing monitoring devices is an urgent problem for those skilled in the art at present. Summary of the Utility Model

[0005] In view of this, the purpose of the utility model is to provide a fault monitoring and early warning system for high-voltage cable joints, which can perform real-time fault monitoring on the intermediate joints of high-voltage cables, and can accurately predict whether faults occur inside and outside the intermediate joints, so as to improve the monitoring accuracy of the system.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A fault monitoring and early warning system for high-voltage cable joints includes a plurality of intermediate joints for connecting high-voltage cables and fault monitoring devices arranged on the outer periphery of the intermediate joints. The plurality of fault monitoring devices are connected through temperature-measuring optical fibers, and one of the fault monitoring devices is connected to a monitoring device. The fault monitoring device includes:

[0008] A housing, detachably provided on the periphery of the high-voltage cable and the intermediate connector;

[0009] A traveling wave sensor is detachably mounted on the outer periphery of the housing and is used to monitor the traveling wave signal of the high-voltage cable in real time;

[0010] The optical fiber temperature sensor is arranged in the housing and is connected to the traveling wave sensor signal. The optical fiber temperature sensor is used to monitor the temperature signal of the intermediate joint in real time and send the monitored temperature signal and the received traveling wave signal to the monitoring device.

[0011] Preferably, the optical fiber temperature sensor includes a temperature measuring optical fiber, which is spirally arranged on the inner wall of the shell, and optical fiber interfaces are provided at both ends of the outer periphery of the shell. One of the optical fiber interfaces is connected to the monitoring device through the temperature measuring optical fiber, and the other optical fiber interface is connected to the optical fiber interface of another optical fiber temperature sensor through the temperature measuring optical fiber.

[0012] Preferably, removable explosion-proof pressure relief covers are provided at both ends of the shell, and the ends of the explosion-proof pressure relief covers in contact with the shell are provided with clips, and both end surfaces of the shell are provided with slots that cooperate with the clips, so that the clips can be removably clipped into the slots.

[0013] Preferably, a card slot is provided at the end of the explosion-proof pressure relief cover that contacts the shell, and connecting pieces that cooperate with the card slot are provided on both end surfaces of the shell, and the connecting pieces are detachably connected to the card slot.

[0014] Preferably, the shell is a flame-retardant shell, which includes a detachably connected upper shell and a lower shell, an inner wall of the upper shell is provided with a temperature measuring optical fiber, and optical fiber interfaces are provided at both ends of the outer periphery of the upper shell.

[0015] Preferably, the inner wall of the upper shell is provided with a groove for installing the temperature measuring optical fiber.

[0016] Preferably, a heat-conducting silicone sheet is provided inside the upper shell.

[0017] Preferably, the traveling wave sensor is a through-hole openable and closable structure.

[0018] Preferably, the monitoring device includes a receiving unit for receiving the traveling wave signal and the temperature signal and a detecting unit for detecting whether the traveling wave signal and the temperature signal are within a preset range.

[0019] Preferably, the monitoring device further comprises a display screen for displaying the detection results and an alarm for giving an alarm, and the alarm is connected to the detection unit.

[0020] The fault monitoring and early warning system for high-voltage cable joints provided by the present utility model includes a plurality of intermediate joints for connecting high-voltage cables and a fault monitoring device disposed on the outer periphery of the intermediate joints. By setting the fault monitoring device to perform real-time fault monitoring on the intermediate joints, the faults of the intermediate joints can be detected in time and measures can be taken to eliminate potential safety hazards. The plurality of fault monitoring devices are connected by a temperature-measuring optical fiber, and one of the fault monitoring devices is connected to a monitoring device. Through the temperature-measuring optical fiber, the connection between the plurality of fault monitoring devices can be realized. When any one of the intermediate joints fails, the temperature-measuring optical fiber of the fault monitoring device disposed on the faulty intermediate joint is disconnected and directly connected to the fault monitoring device on the next fault-free intermediate joint through the temperature-measuring optical fiber, which can ensure that when any one of the intermediate joints fails, the system's fault judgment of other intermediate joints is not affected.

[0021] The fault monitoring device includes a housing, a traveling wave sensor, and a temperature-measuring component. Specifically, the housing is detachably disposed on the outer periphery of the high-voltage cable and the intermediate joint to protect the intermediate joint and prevent the intermediate joint from being directly exposed to the air, which may cause the position where the intermediate joint is connected to the high-voltage cable to be affected by moisture and corrosion, resulting in the failure of the intermediate joint. The traveling wave sensor is detachably disposed on the outer periphery of the housing. Through the detachable design, the traveling wave sensor can be quickly and conveniently installed on the housing for easy use. The traveling wave sensor is used to monitor the traveling wave signal inside the high-voltage cable in real time. The traveling wave sensor has the characteristic of ultra-high-speed operation, which can quickly and accurately calculate the fault distance of the high-voltage cable and output the result quickly.

[0022] The fiber optic temperature sensor is disposed inside the housing. The fiber optic temperature sensor is signal-connected to the traveling wave sensor. The traveling wave sensor sends the monitored traveling wave signal to the fiber optic temperature sensor. The fiber optic temperature sensor is used to monitor the temperature signal at the intermediate joint in real time and send the monitored temperature signal and the received traveling wave signal to the monitoring device. By setting the fiber optic temperature sensor, the operating temperature of the intermediate joint can be monitored and transmitted in real time. The monitored temperature signal is sent to the monitoring device, and at the same time, the traveling wave signal is sent to the monitoring device. The monitoring device performs fault prediction on the intermediate joint according to the received temperature signal and traveling wave signal. The staff can take corresponding protection measures for the corresponding position of the high-voltage cable according to the fault prediction result to avoid accidents such as breakdown or burning of the intermediate joint, thereby realizing the protection of the intermediate joint. Through the combined setting of the fiber optic temperature sensor and the traveling wave sensor, it is possible to accurately predict whether a fault has occurred inside and outside the intermediate joint, so as to improve the monitoring accuracy of the system. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0024] Figure 1 Structural schematic diagram of the fault monitoring device provided by the present invention;

[0025] Figure 2 Structural schematic diagram of the fault monitoring and early warning system for high-voltage cable joints provided by the present invention;

[0026] Figure 3 Explosion diagram of the fault monitoring and early warning system for high-voltage cable joints provided by the present invention;

[0027] Figure 4 Structural schematic diagram of the upper shell provided by the present invention.

[0028] Reference numerals:

[0029] 01 - High-voltage cable, 02 - Intermediate joint, 03 - Fault monitoring device, 04 - Monitoring device;

[0030] 1 - Housing, 11 - Upper shell, 12 - Lower shell;

[0031] 2 - Traveling wave sensor;

[0032] 3 - Fiber optic temperature sensor, 31 - Temperature measuring optical fiber, 32 - Fiber optic interface;

[0033] 4 - Explosion-proof pressure relief cover;

[0034] 5 - Thermal conductive silica gel sheet. Detailed implementation manners

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0036] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] The core of the present utility model is to provide a fault monitoring and early warning system for high-voltage cable joints, which can perform real-time fault monitoring on the intermediate joint 02 of the high-voltage cable 01, and can accurately predict whether a fault occurs inside and outside the intermediate joint 02, so as to improve the monitoring accuracy of the system.

[0038] Please refer to Figure 1 , Figure 2 and Figure 3 , a fault monitoring and early warning system for high-voltage cable joints includes a plurality of intermediate joints 02 for connecting the high-voltage cable 01 and a fault monitoring device 03 arranged on the outer periphery of the intermediate joint 02. By setting the fault monitoring device 03 to perform real-time fault monitoring on the intermediate joint 02, the faults of the intermediate joint 02 can be detected in time and measures can be taken to eliminate potential safety hazards. The plurality of fault monitoring devices 03 are connected by a temperature measurement optical fiber 31, and one of the fault monitoring devices 03 is connected to a monitoring device 04. Through the temperature measurement optical fiber 31, the connection between the plurality of fault monitoring devices 03 can be realized. When any one of the intermediate joints 02 fails, the temperature measurement optical fiber 31 of the fault monitoring device 03 arranged on the failed intermediate joint 02 is disconnected, and directly connected to the fault monitoring device 03 on the next fault-free intermediate joint 02 through the temperature measurement optical fiber 31, which can ensure that when any one of the intermediate joints 02 fails, it will not affect the system's fault judgment of other intermediate joints 02.

[0039] The fault monitoring device 03 includes a housing 1, a traveling wave sensor 2 and a temperature measurement component. Specifically, the housing 1 is detachably arranged on the outer periphery of the high-voltage cable 01 and the intermediate joint 02, and is used to protect the intermediate joint 02 to prevent the intermediate joint 02 from being directly exposed to the air, resulting in moisture and corrosion at the connection position between the intermediate joint 02 and the high-voltage cable 01, causing the intermediate joint 02 to fail. The traveling wave sensor 2 is detachably arranged on the outer periphery of the housing 1. Through the detachable design, the traveling wave sensor 2 can be quickly and conveniently installed on the housing 1 for easy use. The traveling wave sensor 2 is used to monitor the traveling wave signal inside the high-voltage cable 01 in real time. The traveling wave sensor 2 has the characteristic of ultra-high-speed operation, can quickly and accurately calculate the fault distance of the high-voltage cable 01, and can output the result quickly.

[0040] The optical fiber temperature sensor 3 is arranged inside the housing 1. The optical fiber temperature sensor 3 is signal-connected to the traveling wave sensor 2. The traveling wave sensor 2 sends the monitored traveling wave signal to the optical fiber temperature sensor 3. The optical fiber temperature sensor 3 is used to monitor the temperature signal at the intermediate joint 02 in real time, and send the monitored temperature signal and the received traveling wave signal to the monitoring device 04. By setting the optical fiber temperature sensor 3, the operating temperature of the intermediate joint 02 can be monitored and transmitted in real time. The monitored temperature signal is sent to the monitoring device 04, and at the same time the traveling wave signal is sent to the monitoring device 04. The monitoring device 04 performs fault prediction on the intermediate joint 02 according to the received temperature signal and traveling wave signal. The staff can take corresponding protection measures for the position corresponding to the high-voltage cable 01 according to the fault prediction result, avoiding accidents such as breakdown or burning of the intermediate joint 02, thereby realizing the protection of the intermediate joint 02. Through the combined setting of the optical fiber temperature sensor 3 and the traveling wave sensor 2, it is possible to accurately predict whether a fault has occurred inside and outside the intermediate joint 02, so as to improve the monitoring accuracy of the system.

[0041] Among them, due to the use of the traveling wave after the transmission line fails in the traveling wave distance protection, the protection device has the characteristic of ultra-high-speed operation. Moreover, by using the characteristics of traveling wave reflection and refraction, the fault distance can be accurately calculated, and at the same time, it serves as both the protection action discrimination quantity and the ranging output result, that is, it integrates protection and ranging. The optical fiber temperature sensor 3 is essentially a fire and explosion-proof device and does not require explosion-proof measures, which is very safe and reliable. Compared with electrical sensors, it can not only reduce costs but also improve sensitivity.

[0042] The fault monitoring and early warning system can monitor and give fault early warnings to multiple intermediate joints 02 on the cable lines laid in the same direction, such as Figure 2 shown. The optical fiber temperature sensor 3 is used for the transmission of temperature signals and data. The data of the traveling wave sensor 2 can also be communicated with the monitoring device 04 through the optical fiber temperature sensor 3. The configuration and combination of the monitoring device 04 are simple and convenient, suitable for the application scenarios of most photovoltaic power station cable lines. The fault monitoring device 03 has the functions of physical protection and protection for the intermediate joint 02 of the cable. At the same time, it adopts the technical idea of intelligent prediction and early warning of potential hazards before the fault of the intermediate joint 02 and fast and accurate diagnosis after the fault, realizing real-time perception of the operating state of the photovoltaic field cable line and intelligent operation and maintenance decision-making, comprehensively improving the reliability of photovoltaic power generation and the level of operation and maintenance management.

[0043] The fault monitoring and early warning system of the high-voltage cable joint set in the above way integrates the comprehensive monitoring analysis and fault early warning functions of optical fiber temperature measurement and traveling wave detection, can timely discover and take measures to eliminate potential safety hazards, reduce the loss of power generation of the power station caused by sudden faults, and improve the safety and reliability of the operation of the high-voltage cable 01.

[0044] In the above embodiment, the optical fiber temperature sensor 3 includes a temperature-measuring optical fiber 31, which is spirally arranged on the inner wall of the housing 1. Fiber optic connectors 32 are provided at both ends of the outer periphery of the housing 1. One of the fiber optic connectors 32 is connected to the monitoring device 04 through the temperature-measuring optical fiber 31, and the other fiber optic connector 32 is connected to the fiber optic connector 32 of another optical fiber temperature sensor 3 through the temperature-measuring optical fiber 31.

[0045] It should be noted that fiber optic connectors 32 are provided at both ends of the housing 1, and a temperature-measuring optical fiber 31 is installed inside the housing 1. The temperature-measuring optical fiber 31 is arranged and fixed along the inner wall of the housing 1 in a spiral shape. The spiral arrangement can increase the contact length between the temperature-measuring optical fiber 31 and the intermediate joint 02. Compared with the conventional laying method of optical fiber temperature measurement, it can improve the accuracy of temperature measurement data.

[0046] Among them, in this embodiment, the fault monitoring devices 03 on multiple intermediate joints 02 are connected in series and finally connected to the monitoring device 04. By using the fault monitoring device 03 to perform real-time fault monitoring on the intermediate joint 02, the fault of the intermediate joint 02 can be detected in time and measures can be taken to eliminate potential safety hazards. When any one of the intermediate devices fails, the temperature-measuring optical fiber 31 of the housing 1 on the faulty intermediate joint 02 is disconnected and directly connected to the fiber optic connector 32 of the housing 1 on the next fault-free intermediate joint 02 through the temperature-measuring optical fiber 31. This can ensure that when any one of the intermediate joints 02 fails, it will not affect the system's fault judgment of other intermediate joints 02.

[0047] In the above situation, detachable explosion-proof pressure relief covers 4 are provided at both ends of the housing 1. The end of the explosion-proof pressure relief cover 4 in contact with the housing 1 is provided with a clamping member, and clamping grooves cooperating with the clamping member are provided on both end faces of the housing 1, so that the clamping member can be detachably clamped in the clamping groove.

[0048] It can be understood that movable explosion-proof pressure relief covers 4 are provided at both ends of the housing 1 as explosion-proof energy release ports. When a serious fault such as a short circuit breakdown occurs in the intermediate joint 02 inside the housing 1, the explosion-proof pressure relief cover 4 can be separated from the housing 1 within a short time under the action of high-pressure and high-temperature gas, so that the high-pressure and high-temperature gas inside the housing 1 can be discharged, avoiding consequences such as deflagration of the fault monitoring device 03 itself.

[0049] Furthermore, the end of the explosion-proof pressure relief cover 4 in contact with the housing 1 is provided with a clamping groove, and clamping members cooperating with the clamping groove are provided on both end faces of the housing 1. The clamping members can be detachably clamped in the clamping groove.

[0050] It should be noted that during installation, align the clamping part of the housing 1 with the card slot of the explosion-proof pressure relief cover 4, and snap the clamping part into the card slot to achieve the clamping connection between the explosion-proof pressure relief cover 4 and the housing 1. When a serious fault such as a short circuit breakdown occurs in the intermediate joint 02, the explosion-proof pressure relief cover 4 can be detached from the housing 1 within a short time under the action of high-pressure and high-temperature gas, so that the high-pressure and high-temperature gas inside the housing 1 can be discharged, thereby avoiding consequences such as deflagration of the body of the fault monitoring device 03.

[0051] Alternatively, a clamping part may be provided at the end of the explosion-proof pressure relief cover 4 in contact with the housing 1, and card slots cooperating with the clamping part are provided on both end faces of the housing 1. The clamping part is detachably clamped in the card slot. During installation, align the clamping part of the explosion-proof pressure relief cover 4 with the card slot of the housing 1, and snap the clamping part into the card slot to achieve the clamping connection between the explosion-proof pressure relief cover 4 and the housing 1. When a serious fault such as a short circuit breakdown occurs in the intermediate joint 02, the explosion-proof pressure relief cover 4 can be detached from the housing 1 within a short time under the action of high-pressure and high-temperature gas, so that the high-pressure and high-temperature gas inside the housing 1 can be discharged, thereby avoiding consequences such as deflagration of the body of the fault monitoring device 03. There is no limit to the clamping method between the housing 1 and the explosion-proof pressure relief cover 4, and other methods other than the above two schemes can also be adopted as long as the above technical effects can be achieved.

[0052] Please refer to Figure 3 and Figure 4 , the housing 1 is a flame-retardant housing 1, and the housing 1 includes an upper shell 11 and a lower shell 12 that are detachably connected. A temperature-measuring optical fiber 31 is provided on the inner wall of the upper shell 11, and optical fiber interfaces 32 are provided at both ends of the outer periphery of the upper shell 11.

[0053] It can be understood that the housing 1 is made of flame-retardant materials such as fiberglass to prevent the housing 1 from being ignited when a serious fault such as a short circuit breakdown occurs in the intermediate joint 02. In this embodiment, the housing 1 is divided into an upper shell 11 and a lower shell 12. The upper shell 11 and the lower shell 12 can be connected by clamping or bolt connection, and there is no limit to this as long as the above technical effects can be achieved.

[0054] On the basis of the above embodiment, a groove for installing the temperature-measuring optical fiber 31 is provided on the inner wall of the upper shell 11.

[0055] It should be noted that in actual production, for the convenience of installing the temperature-measuring optical fiber 31, a groove for installing the temperature-measuring optical fiber 31 can be directly machined when producing the upper shell 11, or the temperature-measuring optical fiber 31 can be directly bonded to the inner wall of the upper shell 11.

[0056] Among them, in this embodiment, the groove should be spirally provided on the inner wall of the upper shell 11, but in actual applications, there is no limit to this as long as the above technical effects can be achieved.

[0057] In the above embodiment, a heat-conducting silica gel sheet 5 is sleeved inside the upper shell 11.

[0058] It can be understood that during on-site installation, an appropriate heat-conducting silica gel sheet 5 can be added on the side of the intermediate joint 02 of the high-voltage cable 01 close to the temperature-measuring optical fiber 31, so as to ensure that the temperature at the position of the intermediate joint 02 is conducted to the temperature-measuring optical fiber 31, and the accuracy and precision of optical fiber temperature measurement can be increased.

[0059] Among them, there are no restrictions on the quantity, thickness, etc. of the heat-conducting silica gel sheet 5, which is determined according to the actual application scenario.

[0060] As a preferred embodiment, the traveling wave sensor 2 is of a through-hole openable and closable structure.

[0061] It should be noted that the traveling wave sensor 2 is installed at the middle position outside the housing 1. The traveling wave sensor 2 is divided into upper and lower parts and adopts a through-hole openable and closable structure, which forms the function of an induction coil after the upper shell 11 and the lower shell 12 are closed.

[0062] In the above situation, the monitoring device 04 includes a detection unit for detecting whether the traveling wave signal and the temperature signal are within a preset range.

[0063] It can be understood that the monitoring device 04 receives the traveling wave signal and the temperature signal through the receiving unit. The preset traveling wave signal range and the preset temperature signal range have been pre-input in the detection unit. Here, the preset traveling wave signal range is the traveling wave value range inside the intermediate joint 02 under normal conditions, and the preset temperature signal range is the temperature value range of the intermediate joint 02 inside the housing 1 under normal conditions. The detection unit compares the real-time received traveling wave signal with the preset traveling wave signal range. When the real-time received traveling wave signal is within the preset traveling wave signal range, it indicates that the intermediate joint 02 has no fault. When the real-time received traveling wave signal is not within the preset traveling wave signal range, it indicates that the intermediate joint 02 has a fault; at the same time, the detection unit compares the real-time received temperature signal with the preset temperature signal range. When the real-time received temperature signal is within the preset temperature signal range, it indicates that the intermediate joint 02 has no fault. When the real-time received temperature signal is not within the preset temperature signal range, it indicates that the intermediate joint 02 has a fault.

[0064] In the above embodiment, the monitoring device 04 further includes a display screen for displaying the detection result and an alarm for alarming. The alarm is connected to the detection unit.

[0065] It should be noted that the monitoring device 04 displays the result detected by the detection unit through the display screen to prompt the staff about the fault signal of the intermediate joint 02, and alarms the fault signal detected by the detection unit through the alarm to prompt the staff to process the intermediate joint 02 with the fault signal.

[0066] In summary, the fault monitoring and early warning system for high-voltage cable joints provided by the present utility model can simultaneously monitor and analyze the waveform data of the operating temperature and the internal current change trend of the intermediate joint 02 of the high-voltage cable 01 through the device for temperature monitoring and internal partial discharge detection during operation. The monitoring data is analyzed by the monitoring device 04 to determine the operating state of the cable, make relevant predictions and alarms for the occurrence of cable faults, help the power station operation and maintenance personnel to timely discover the hidden faults of the intermediate joint 02 of the cable and conduct relevant treatments in a timely manner, and avoid the occurrence of breakdown or burning accidents of the intermediate joint 02 of the cable.

[0067] In the present specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0068] The above has introduced in detail a fault monitoring and early warning system for a high-voltage cable joint provided by the present utility model. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A fault monitoring and early warning system for a high-voltage cable joint, characterized in that, The invention comprises a plurality of intermediate joints (02) for connecting high-voltage cables (01) and a fault monitoring device (03) provided on the periphery of the intermediate joints (02), wherein the plurality of fault monitoring devices (03) are connected via a temperature measuring optical fiber (31), and one of the fault monitoring devices (03) is connected to a monitoring device (04), and the fault monitoring device (03) comprises: A housing (1) is detachably arranged on the outer periphery of the high-voltage cable (01) and the intermediate joint (02); A traveling wave sensor (2) is detachably arranged on the outer periphery of the housing (1), and the traveling wave sensor (2) is used to monitor the traveling wave signal inside the high-voltage cable (01) in real time; An optical fiber temperature sensor (3) is disposed in the housing (1), the optical fiber temperature sensor (3) being connected to the traveling wave sensor (2) for signal transmission, the optical fiber temperature sensor (3) being used to monitor the temperature signal of the intermediate joint (02) in real time, and to transmit the monitored temperature signal and the received traveling wave signal to the monitoring device (04).

2. The fault monitoring and early warning system for high-voltage cable joints according to claim 1, wherein, The optical fiber temperature sensor (3) comprises the temperature measuring optical fiber (31), the temperature measuring optical fiber (31) is spirally arranged on the inner wall of the shell (1), and optical fiber interfaces (32) are provided at both ends of the outer periphery of the shell (1), one of the optical fiber interfaces (32) is connected to the monitoring device (04) through the temperature measuring optical fiber (31), and the other optical fiber interface (32) is connected to the optical fiber interface (32) of another optical fiber temperature sensor (3) through the temperature measuring optical fiber (31).

3. The fault monitoring and warning system for high-voltage cable joints according to claim 1, wherein, Both ends of the shell (1) are provided with detachable explosion-proof pressure relief covers (4), the ends of the explosion-proof pressure relief covers (4) in contact with the shell (1) are provided with clamping parts, and both end surfaces of the shell (1) are provided with clamping grooves that cooperate with the clamping parts, so that the clamping parts can be detachably clamped in the clamping grooves.

4. The fault monitoring and early warning system for high-voltage cable joints according to claim 3, characterized in that, The end of the explosion-proof pressure relief cover (4) in contact with the housing (1) is provided with the card slot, and the two end surfaces of the housing (1) are provided with the card connector that cooperates with the card slot, and the card connector is detachably connected to the card slot.

5. The fault monitoring and early warning system for high-voltage cable joints according to claim 2, characterized in that, The housing (1) is a flame-retardant housing, comprising a detachably connected upper housing (11) and a lower housing (12), the inner wall of the upper housing (11) being provided with the temperature measuring optical fiber (31), and the optical fiber interfaces (32) being provided at both ends of the outer periphery of the upper housing (11).

6. The fault monitoring and early warning system for high-voltage cable joints according to claim 5, characterized in that, The inner wall of the upper shell (11) is provided with a groove for installing the temperature measuring optical fiber (31).

7. The fault monitoring and warning system for the high-voltage cable joint according to claim 6, characterized in that, A heat-conducting silica gel sheet (5) is sleeved inside the upper shell (11).

8. The fault monitoring and early warning system for the high-voltage cable joint according to claim 1, characterized in that, The traveling wave sensor (2) is a through-hole openable and closable structure.

9. The fault monitoring and early warning system for the high-voltage cable joint according to claim 1, characterized in that, The monitoring device (04) comprises a receiving unit for receiving the traveling wave signal and the temperature signal and a detecting unit for detecting whether the traveling wave signal and the temperature signal are within a preset range.

10. The fault monitoring and early warning system for high-voltage cable joints according to claim 9, characterized in that, The monitoring device (04) further comprises a display screen for displaying the detection result and an alarm for giving an alarm, wherein the alarm is connected to the detection unit.

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