A fall-out fuse monitoring device

Abstract

The application provides a kind of drop-out fuse monitoring device, it is related to the technical field of measurement electric variable, it includes fixed part and module part, fixed part and module part can be detached connection.Fixed part is installed at fuse static contact, including protective shell, current sensor, temperature sensor and pressure detection component;Protective shell surrounds part static contact conductive circuit, current sensor is covered in the conductive circuit, temperature sensor is installed on the side of line, and the detection end of pressure detection component is in contact with static contact, and the detection end is in compression state when closing.The module part and the fixed part are plug-in connected, including module shell, embedded module and power supply, the embedded module and the power supply are arranged in the shell, and each sensor is connected through the sliding electrical connection structure of the module shell.The application has simple structure, low cost, modular design will easily failure maintenance main circuit independent packaging, simplifies operation and maintenance;Pressure detection component can also long-term accurate monitoring closing state and contact reliability, realize early warning.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of measuring electrical variables, and in particular to a drop-out fuse monitoring device. BACKGROUND

[0002] In a power distribution network, a drop-out fuse is a core device for realizing short-circuit protection and overload protection of an overhead transmission line. Due to its simple structure, low cost, and convenient maintenance, the drop-out fuse is widely used in key nodes such as branch lines and power distribution transformer inlet terminals of 10 kV and below power distribution lines, and plays an important role in isolating fault sections and ensuring normal power supply in non-fault areas. Some power grids in remote areas have characteristics such as long line span, scattered distribution of towers, and complex terrain and topography. Due to the limitations of construction cost and operation and maintenance conditions, the degree of line automation is low, and therefore the stable operation of the drop-out fuse directly determines the reliability of regional power supply.

[0003] The existing drop-out fuse mainly consists of a static contact, a dynamic contact, a load fuse, and an insulating support. In normal operation, the dynamic contact and the static contact are in a closed state, and the load fuse maintains reliable contact with the static contact through an elastic structure, so that the line current forms a complete loop through the static contact conductor line, the load fuse, and the dynamic contact. When an overload or short-circuit fault occurs in the line, the fuse melts due to heat, and the load fuse automatically drops under the action of gravity and spring force, thereby realizing physical isolation of the fault section from the main line and protecting downstream devices such as power distribution transformers and cables from damage.

[0004] During long-term operation, the structural characteristics of the drop-out fuse cause two types of problems, as follows:

[0005] The first type of problem is the fault isolation mechanism after overload protection. When the line overload causes the fuse to melt, the drop of the load fuse can achieve fault isolation, but this process is a passive fault response and cannot provide real-time feedback of the specific location of the fault to the operation and maintenance personnel. Moreover, the power distribution lines in remote areas are often erected along fields and slopes, and after a fault occurs, the position of the load fuse drop may be blocked or in an area that is difficult for personnel to quickly reach, which makes it impossible for the operation and maintenance personnel to know the fault node in the first time and only allows them to rely on manual inspection of each pole and section, greatly prolonging the fault location time. More importantly, the drop of the load fuse directly causes the power outage of the corresponding branch line or power distribution transformer, and in remote areas, the power supply load, such as agricultural irrigation equipment, small-scale processing enterprise electricity, and residential electricity, is highly bound. Long-time power outage not only causes production delay, but also affects the basic life of residents.

[0006] The second type of problem is the closing contact reliability problem of the static contact and the moving contact: under the normal closing state, the reliable contact of the moving contact and the static contact relies on the contact pressure therebetween, and if the contact pressure is insufficient, the contact resistance of the contact surface of the two will be significantly increased, a large amount of Joule heat will be generated, the heat accumulation will not only cause the temperature of the static contact conductive line to be abnormally high, but also can cause the oxidation and ablation of the surface of the contact, and in severe cases, can even cause the static contact conductive line to be fused, the insulating support to be carbonized, and further cause the line to be single-phase grounded, inter-phase short-circuited and other more serious faults. More hiddenly, the process of increasing the contact resistance and increasing the temperature is often gradual, and there is no obvious external feature before the fault occurs, so the maintenance personnel cannot find such potential hidden dangers through routine visual inspection, and can only repair after the fault occurs, and cannot realize early warning and prevention of the fault.

[0007] From the existing monitoring technology, the monitoring equipment for the drop-out fuse at present is mostly a single parameter monitoring device, for example, a current transformer for monitoring only the line current, which lacks multi-dimensional monitoring means and is difficult to find hidden problems, and a single means is also prone to false reporting; further, the existing monitoring device is mostly designed in an integrated manner, and due to environmental influence and electromagnetic influence, the main circuit part of the monitoring device is prone to failure, and disassembling and maintaining the whole device not only affects the power supply reliability, but also increases the operation and maintenance complexity. In particular, some intelligent monitoring equipment also needs to be regularly upgraded and maintained.

[0008] In summary, the traditional drop-out fuse has the problems of difficult positioning of the drop-out position of the overload carrying fuse, increased contact resistance caused by insufficient contact pressure and no early warning, low efficiency of manual inspection and untimely repair, the existing intelligent monitoring technology lacks multi-dimensional monitoring means, and the disassembly and electrical connection mode of the device cannot adapt to the outdoor operation and maintenance requirements. Practical new type content

[0009] The present application provides a drop-out fuse monitoring device with multi-parameter synchronous monitoring function, detachable module structure and reliable electrical connection to solve the above problems.

[0010] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0011] The present application provides a drop-out fuse monitoring device, which mainly comprises a fixed part and a module part; the fixed part and the module part are detachably connected;

[0012] The fixed part is installed at the static contact of the drop-out fuse, and is provided with a protective shell, a current sensor, a temperature sensor and a pressure detection assembly; the protective shell encloses at least part of the static contact conductive circuit; the current sensor is located inside the protective shell, and the current sensor is sleeved on the static contact conductive circuit; the temperature sensor is located inside the protective shell, and the temperature sensor is installed beside the static contact conductive circuit;

[0013] The pressure detection assembly is also installed in the protective shell, and the detection end of the pressure detection assembly abuts against the static contact; when the moving contact and the static contact of the drop-out fuse are in the closed state, the detection end of the pressure detection assembly is in the compressed state;

[0014] The module part is plug-in connected with the fixed part; the module part is provided with a module shell, an embedded module and a power supply; the embedded module and the power supply are located inside the module shell, and the power supply is connected with the embedded module; the embedded module is connected with the current sensor, the temperature sensor and the pressure detection assembly through the sliding electrical connection structure on the module shell.

[0015] Optionally, the pressure detection assembly comprises a mounting box, a sliding seat, a pressure sensor and a pressure guide rod;

[0016] The top of the mounting box is an open structure, and the mounting box is inverted on the top cover of the static contact mounting position;

[0017] The sliding seat is located in the mounting box, and the sliding seat is slidingly matched with the mounting box; at least one set of springs is arranged between the sliding seat and the mounting box, and is used for thrusting the sliding seat;

[0018] The pressure sensor is installed on the sliding seat, and the detection end of the pressure sensor is matched with the pressure guide rod;

[0019] The top cover of the static contact mounting position is also processed with a pressure detection through hole; the end of the pressure guide rod passes through the pressure detection through hole, and is in contact with the static contact in the closed state of the fuse.

[0020] Optionally, one end of the pressure guide rod is a sliding block structure, and the other end is a ball head structure;

[0021] The sliding block structure is slidingly matched with the inside of the mounting box, and abuts against the detection end of the pressure sensor in the closed state of the fuse.

[0022] Optionally, a U-shaped fixing frame is fixedly installed on the surface of the protective shell; two sides of the U-shaped fixing frame are respectively provided with L-shaped sliding grooves, and the top end of the U-shaped fixing frame is provided with a sunken clamping groove; a limiting spring sheet is installed in the sunken clamping groove;

[0023] The module shell is a sealed square box structure, the bottom edge is provided with a transversely protruding guide piece; the guide piece is matched with a corresponding L-shaped sliding groove; the top of the module shell is provided with a limiting head, and the limiting head is detachably clamped with the limiting elastic sheet.

[0024] Optionally, a sealing layer is arranged between the U-shaped fixing frame and the protective shell.

[0025] A elastic layer is arranged between the U-shaped fixing frame and the module shell.

[0026] Optionally, the mounting surface of the U-shaped fixing frame is a slope structure.

[0027] Optionally, the sliding electrical connection structure comprises a conductive sheet and a sliding contact;

[0028] The outer surface of the protective shell is provided with a plurality of conductive sheets, and the conductive sheets are connected with the current sensor, the temperature sensor and the pressure detection assembly through wires;

[0029] The outer surface of the module shell is provided with a plurality of sliding contacts; when the module part is inserted with the fixed part, each sliding contact is in contact with a corresponding conductive sheet.

[0030] Optionally, the power supply is a super capacitor or a battery; a photovoltaic panel is mounted on the surface of the module shell, and the photovoltaic panel is connected with the power supply through a charging circuit.

[0031] Optionally, the current sensor is a power taking CT.

[0032] Optionally, the embedded module is further connected with a positioning module and a wireless communication module through an expansion interface.

[0033] Compared with the prior art, the application has the following beneficial effects:

[0034] The application has simple structure and low cost, and through modularization and detachable design, the main circuit part which is prone to failure and needs regular maintenance is independently packaged, and is connected with each sensor by means of an electrical connection structure, so that the purpose of simplifying operation and maintenance is achieved; further, based on the pressure detection assembly, not only the closed state can be accurately monitored for a long time, but also the closed contact reliability can be accurately monitored, so that the early warning effect is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0036] Figure 1 Fig. 1 is a schematic diagram of the internal structure and installation position structure of the monitoring device in the embodiments of the present application;

[0037] Figure 2 Fig. 2 is a perspective view of the pressure detection assembly in the embodiments of the present application;

[0038] Figure 3 Fig. 3 is an exploded view of the pressure detection assembly in the embodiments of the present application;

[0039] Figure 4 Fig. 4 is an exploded view of the module installation structure in the embodiments of the present application;

[0040] Figure 5 Fig. 5 is a rear perspective view of the module shell in the embodiments of the present application;

[0041] Figure 6 Fig. 6 is a rear perspective view of the U-shaped fixing frame in the embodiments of the present application.

[0042] In the figure: 1, insulating base, 2, fuse carrier, 3, movable contact, 4, static contact, 5, compression spring, 6, top cover, 7, super capacitor, 8, module shell, 9, micro control unit, 10, photovoltaic panel, 11, wire, 12, pressure detection assembly, 1201, installation box, 1202, spring, 1203, sliding seat, 1204, pressure sensor, 13, wiring terminal, 14, current sensor, 15, folded edge, 16, temperature sensor, 17, wiring terminal conductive rod, 18, bolt, 19, pressure guide rod, 20, protective shell, 21, conductive sheet, 22, sliding contact, 23, U-shaped fixing frame, 24, L-shaped sliding groove, 25, guide sheet, 26, limit head, 27, limit spring sheet. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0044] It should be noted that: similar labels and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0045] In the description of the present application, it should be understood that the relative relationship indicated by the terms "upper", "lower", "back" and the like is described based on the position shown in the drawings for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific position, and therefore cannot be understood as a limitation on the present application.

[0046] In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0047] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] It should be noted that the methods used in the present application are conventional methods unless otherwise specified; the raw materials and devices used are conventional commercially available products unless otherwise specified, and their sources are not specifically limited.

[0049] It should be noted that the present embodiment takes a conventional drop-out fuse as an example to describe the device, as shown in Figure 1 The fuse adapted in the present embodiment includes an insulating base 1, a fuse carrying member 2, a movable contact 3 and a static contact 4. The static contact 4 is fixedly connected with a wiring terminal conductive rod 17 through a bolt 18, and the top of the wiring terminal conductive rod 17 is provided with a wiring terminal 13. The installation position of the static contact 4 is generally provided with an insulating top cover 6, and a compression spring 5 is installed between the static contact 4 and the top cover 6, for pressing the static contact 4 against the movable contact 3.

[0050] As shown in Figures 1-6 The present embodiment provides a drop-out fuse monitoring device, which mainly includes a fixed part and a module part, and the fixed part and the module part are detachably connected.

[0051] Among them, combined with Figure 4As shown, the fixed part includes the protective shell 20, the current sensor 14, the temperature sensor 16 and the pressure detection assembly 12. The protective shell 20 is designed in an insulating structure and is made of non-metallic material, which is fixedly installed on the top cover 6 and surrounds the terminal conducting rod 17 to form a closed cavity structure. The current sensor 14, the temperature sensor 16 and the pressure detection assembly 12 are installed in the cavity of the protective shell 20 to achieve a stable sensor operating environment and prolong the service life of the sensors. The terminal conducting rod 17 serves as a main part of the static contact conducting circuit, and in this embodiment, the current sensor 14 is sleeved on the terminal conducting rod 17, specifically a power-taking CT is selected, which can detect the current size in the circuit and is installed without disassembly or modification of the conducting circuit. The temperature sensor 16 is installed beside the terminal conducting rod 17 to monitor temperature changes.

[0052] Further, the pressure detection assembly 12 is also installed in the protective shell 20, with its detection end abutting against the static contact 4; when the moving contact of the drop-out fuse is in the closed state, the detection end of the pressure detection assembly 12 is in a compressed state. Specifically, in combination with Figure 2 and Figure 3 As shown, the pressure detection assembly 12 includes the installation box 1201, the sliding seat 1203, the pressure sensor 1204 and the pressure guide rod 19. The installation box 1201 is in a box structure as a whole, with an open top and folded edges 15 on both sides for providing the installation position of the installation box 1201. As shown in Figure 1 As shown, the installation box 1201 is inverted on the top cover 6 of the static contact installation position and is fixedly connected with the top cover 6 by screws. The sliding seat 1203 is located in the installation box 1201 and is in sliding cooperation with the installation box 1201. The sliding seat 1203 is designed in a flat plate structure, with a circular sunken table and a wiring groove on the surface for installing the adapted pressure sensor 1204; correspondingly, a slot is processed on the side of the installation box 1201 to pass out the data line of the pressure sensor 1204. A plurality of springs 1202 are arranged between the sliding seat 1203 and the installation box 1201 for thrusting the sliding seat 1203. The pressure guide rod 19 is in a sliding block structure at one end and a ball head structure at the other end. The sliding block structure is in sliding cooperation with the inner side of the installation box 1201, and in the closed state of the fuse, the bottom surface thereof abuts against the detection head of the pressure sensor 1204 to realize the cooperation of the detection end of the pressure sensor and the pressure guide rod 19. The ball head structure is threadedly connected with the rod body, and the pressure guide rod as a whole is made of non-metallic insulating material, and a pressure detection through hole is processed on the top cover 6 of the static contact installation position; the rod body of the pressure guide rod passes through the pressure detection through hole, and then the ball head structure is threadedly connected with the rod body, and in the closed state of the fuse, the ball head structure is in contact with the static contact. Lubricating grease is applied between the rod body and the pressure detection through hole to reduce the occurrence rate of jamming.

[0053] Based on the hardware design of the pressure detection assembly 12, the embodiment can monitor the cooperation of the static contact 4 and the moving contact 3 in real time. Compared with the traditional micro switch design, the aging and jamming problem caused by long-term exposure of the micro switch does not need to be considered, and the contact pressure of the static contact 4 and the moving contact 3 can be obtained through the pressure data. At the same time, the embodiment is also different from the conventional fixed pressure sensor design. The pressure sensor is installed on the floating structure, which can effectively amplify the travel range of the pressure detection, and can avoid the situation that the sensor has no reading due to the deformation of the static contact 4 in the later stable operation period. The embodiment can distinguish different states through pressure changes, such as initial closing, stable operation period, poor dynamic static contact, and falling opening. Each of the above states corresponds to a pressure range. In particular, when the falling opening occurs, the fixed position detection will have a pressure value of 0. Although it also includes the falling opening situation, it also includes the sensor failure or line failure situation. The detection pressure of the embodiment will decrease sharply in a short time, thereby accurately judging the falling situation and being obviously distinguished from the pressure value of 0 or other pressure abnormal situations, which helps the operation and maintenance personnel to more accurately judge the current situation.

[0054] The main circuit part of the embodiment is independently modularized and packaged, specifically a module part and a fixed part are plug-in connected. As shown in Figure 1 、 Figures 4-6 , the module part is provided with a module shell 8, an embedded module and a power supply. The module shell 8 is a square box structure, and the embedded module and the power supply are installed inside. The embedded module adopts an embedded development board, and is integrated with a micro control unit 9, a carrier board, a storage medium and other supporting structures, and has a data interface and an expansion interface. The power supply of the embodiment is a super capacitor 7, which is connected to the embedded module through a power supply circuit. In order to realize long-time operation, the embodiment also installs a photovoltaic panel 10 on the surface of the module shell 8, and connects the super capacitor 7 through a charging circuit. Further, in order to realize waterproof sealing design, the internal part of the module part adopts a glue filling sealing process, thereby reducing the erosion influence of rainwater or humid air on the circuit and electronic components.

[0055] In order to realize the quick plug operation, the U-shaped fixing frame 23 is fixedly installed on the surface of the protection shell 20. The installation surface of the U-shaped fixing frame 23 is a slope structure, which can make the subsequent installed module part also in an inclined state, on the one hand, solves the problem of accumulated water placed horizontally, and on the other hand, can ensure that the electrical connection structure required for plugging is in the connected state under the action of gravity, avoiding the problem of loose contact caused by vertical installation. The two sides of the U-shaped fixing frame 23 are respectively provided with L-shaped sliding grooves 24, when the U-shaped fixing frame 23 is fixed with the protection shell 20 by screws, the two L-shaped sliding grooves 24 on the two sides form two symmetrical limiting sliding grooves with the surface of the protection shell 20. Correspondingly, the two side bottom edges of the module shell 8 are provided with guide pieces 25 protruding in the transverse direction. The guide piece 25 cooperates with the corresponding L-shaped sliding groove 24, so that the module shell 8 can be slid from the lower side into the U-shaped fixing frame 23. The back of the horizontal frame at the top of the U-shaped fixing frame 23 is provided with a sunken clamping groove, and T-shaped sunken grooves are symmetrically processed on the two sides for installing limiting elastic pieces 27. The limiting elastic piece 27 is a T-shaped structure made of elastic material, and the two limiting elastic pieces 27 are first placed into the U-shaped fixing frame 23, and then the U-shaped fixing frame 23 is fixedly installed with the protection shell 20. Correspondingly, a limiting head 26 is arranged at the top of the module shell 8, and the limiting head 26 is a rhombus structure, which forms a detachable clamping structure with the limiting elastic piece 27, that is, when the module shell 8 is pushed obliquely upward to the top horizontal frame of the U-shaped fixing frame 23, the limiting head 26 abuts against the two opposite limiting elastic pieces 27, and then the pushing force is increased, so that the limiting elastic piece 27 is elastically deformed, so that the limiting head 26 is completely pushed into the last segment of the sunken clamping groove, and the installation operation is completed.

[0056] Further, a sealing layer is arranged between the back of the U-shaped fixing frame 23 and the protection shell 20, specifically, a waterproof rubber strip is attached to the back of the U-shaped fixing frame 23 to prevent rainwater or dew from penetrating. An elastic layer is also arranged between the U-shaped fixing frame 23 and the module shell 8, specifically, rubber gaskets are attached in the L-shaped sliding grooves 24 and the sunken clamping groove, thereby increasing the connection stability after insertion, and also having a certain waterproof effect. Further, in the actual installation process, in order to prevent the module part from falling off due to external forces such as hail impact, the operator can use glass glue to seal the gap at the bottom side of the module part after the module part is inserted in place, and then when it needs to be replaced or maintained, the rubber strip is scraped off using a degumming knife, and then the module part is manually removed.

[0057] In order to realize the electrical connection of each sensor in the module part and the fixed part, the embedded module is connected with the current sensor, the temperature sensor and the pressure detection assembly through the sliding electrical connection structure on the module shell. Optionally, the sliding electrical connection structure comprises a conductive sheet 21 and a sliding contact 22. The outer surface of the protective shell 20 is provided with a plurality of conductive sheets 21, and the conductive sheet 21 is arranged at the mounting area of the U-shaped fixing frame 23. Each conductive sheet is connected with the corresponding current sensor 14, temperature sensor 16 and pressure detection assembly 12 through the lead wire 11 in the fixed part. The back surface of the module shell 8 is provided with a plurality of sliding contacts 22, which are V-shaped elastic sheet contacts. When the module part is plugged with the fixed part, each sliding contact is in contact with the corresponding conductive sheet, thereby forming a sensor-embedded module path.

[0058] Optionally, the embedded module is also connected with a positioning module and a wireless communication module through the expansion interface. The positioning module can be a GPS module or a Beidou module.

[0059] Working principle:

[0060] State monitoring: After the operator installs the device in place, the embedded module periodically collects data through the current sensor, temperature sensor and pressure detection assembly, packages the data in combination with the power supply information and the geographic position information collected by the positioning module, and sends the data to the remote control center through the wireless communication module. After the packaged data is analyzed by the remote control center, the current fuse operating state can be obtained, and it is determined whether there is poor contact between the moving and static contacts: the pressure data decreases to the corresponding pressure range of poor contact, and the temperature rises to the preset temperature range; drop opening: the pressure data decreases at a rate greater than the threshold value and enters the corresponding pressure range of opening, the current decreases below the threshold value or returns to zero; over-temperature alarm: the temperature rises rapidly and exceeds the maximum temperature threshold.

[0061] Replacement, maintenance or firmware upgrade: the remote control center sends a shutdown instruction, and the embedded module stops the work of each sensor after receiving the instruction; the operator removes the module part sealant and presses the module part downward to make it come out of the U-shaped fixing frame, and then performs replacement, maintenance or firmware upgrade operation on the module part according to the task requirement.

[0062] Finally, it should be pointed out that the above content is only used to illustrate the technical solutions of the present application, and is not a limitation on the protection scope of the present application. Simple modifications or equivalent replacements of the technical solutions of the present application made by those skilled in the art do not deviate from the essence and scope of the technical solutions of the present application.

Claims

1. A drop-out fuse monitoring device characterized by: The fixed part and the module part are detachably connected; The fixed part is installed at the static contact of the drop-out fuse, and the fixed part is provided with a protective shell, a current sensor, a temperature sensor and a pressure detection assembly; the protective shell encloses at least part of the static contact conductive circuit; The current sensor is located inside the protective shell, and the current sensor is sleeved on the static contact conductive circuit; the temperature sensor is located inside the protective shell, and the temperature sensor is installed beside the static contact conductive circuit; The pressure detection assembly is also installed in the protective shell, and the detection end of the pressure detection assembly abuts against the static contact; when the moving contact and the static contact of the drop-out fuse are in the closed state, the detection end of the pressure detection assembly is in the compressed state; The module part is provided with a module shell, an embedded module and a power supply; the embedded module and the power supply are located inside the module shell, and the power supply is connected with the embedded module; The embedded module is connected with the current sensor, the temperature sensor and the pressure detection assembly through the sliding electrical connection structure on the module shell.

2. The monitoring device for a drop-out fuse according to claim 1, characterized in that: The pressure detection assembly comprises a mounting box, a sliding seat, a pressure sensor and a pressure guide rod; The top of the mounting box is an open structure, and the mounting box is inverted on the top cover of the static contact installation position; The sliding seat is located in the mounting box, and the sliding seat is in sliding fit with the mounting box; at least one set of springs is arranged between the sliding seat and the mounting box for thrusting the sliding seat; The pressure sensor is installed on the sliding seat, and the detection end of the pressure sensor is matched with the pressure guide rod; The top cover of the static contact installation position is also processed with a pressure detection through hole; the end of the pressure guide rod passes through the pressure detection through hole and contacts the static contact in the closed state of the fuse.

3. The monitoring device for a drop-out fuse according to claim 2, characterized in that: One end of the pressure guide rod is a sliding block structure, and the other end is a ball head structure; The sliding block structure is in sliding fit with the inside of the mounting box and abuts against the detection end of the pressure sensor in the closed state of the fuse.

4. The monitoring device for a drop-out fuse according to claim 1, characterized in that: A U-shaped fixing frame is fixedly installed on the surface of the protective shell; both sides of the U-shaped fixing frame are respectively provided with L-shaped sliding grooves, and the top end of the U-shaped fixing frame is provided with a sunken clamping groove; a limiting spring is installed in the sunken clamping groove; The module shell is a sealed square box structure, and the bottom edge is provided with a guide piece protruding in the transverse direction; the guide piece is matched with the corresponding L-shaped sliding groove; the top of the module shell is provided with a limiting head, and the limiting head is detachably clamped with the limiting spring.

5. The monitoring device of claim 4, wherein: A sealing layer is arranged between the U-shaped fixing frame and the protective shell; An elastic layer is arranged between the U-shaped fixing frame and the module shell.

6. The monitoring device of claim 4, wherein: The mounting surface of the U-shaped fixing frame is a slope structure.

7. The monitoring device of any one of claims 1-6, wherein: The sliding electrical connection structure comprises a conductive piece and a sliding contact; The outer surface of the protective shell is provided with a plurality of conductive pieces, and the conductive pieces are connected with the current sensor, the temperature sensor and the pressure detection assembly through wires; The outer surface of the module shell is provided with a plurality of sliding contacts; when the module part is inserted with the fixed part, each sliding contact contacts the corresponding conductive piece.

8. The monitoring device of a drop-out fuse according to claim 1, characterized in that: The power supply is a super capacitor or a battery; a photovoltaic panel is mounted on the surface of the module shell, and the photovoltaic panel is connected with the power supply through a charging circuit.

9. The monitoring device of a drop-out fuse according to claim 1, characterized in that: The current sensor is a power-taking CT.

10. The monitoring device of a drop-out fuse according to claim 1, characterized in that: The embedded module is further connected with a positioning module and a wireless communication module through an expansion interface.

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