Fault fixed-point detection device of power distribution network

Abstract

The invention discloses a power distribution network fault fixed-point detection device which comprises a protection box, a sealing cover connected to the protection box through a hinge, a line fault detector arranged in the protection box, a pair of lock boxes arranged on the inner surface of the front end of the protection box, and a pair of insertion buckles arranged on the front surface of the sealing cover. When the inserting buckle is inserted into the lock box, the sealing cover and the protection box are closed and fixed, a containing groove is formed in the lock box, the bottom of the containing groove is integrally communicated with an extending groove, and a pair of blocking rollers are connected into the containing groove in a rolling mode. Sealing protection is carried out on the line fault detector through the protection box, the locking structure is arranged and used for controlling the box body and the box cover of the protection box to be opened and closed, the locking mechanism is not exposed as well, packaging and transportation are facilitated, the locking mechanism is simple in structure and convenient to operate, the locking mechanism is inserted into the lock box mainly through an insertion buckle, and the locking mechanism is convenient to operate. When the blocking roller in the lock box is used for limiting the inserting buckle, the inserting buckle cannot be pulled out of the inserting hole formed in the lock box, and therefore locking is completed.

Description

Technical Field

[0001] The invention belongs to the field of power grid detection, and in particular relates to a fault fixed-point detection device for a distribution network. Background Art

[0002] The neutral point is not grounded. This operation mode has the advantage of high power supply reliability. When a single-phase grounding fault occurs in a small current grounding system, no short-circuit loop is formed and there is no short-circuit current with a large value. However, after a single-phase grounding occurs, the voltage between the non-grounded phase and the ground will increase, and arc overvoltage will be generated when the arc is grounded intermittently. Long-term operation may damage its insulation and cause serious phase-to-phase faults. Therefore, when a single-phase grounding fault occurs in the system, efforts should be made to eliminate the fault immediately, that is, to find the faulty line and fault point as soon as possible. The cable fault detector is a professional test instrument specially developed for the wiring and maintenance of cables such as security monitoring, integrated wiring, and communication circuits. It integrates cable breakpoint testing, short-circuit testing, cable finding, cable sorting and other functions. It is an essential tool for fault point protection detection in distribution networks.

[0003] Chinese patent CN116106673A discloses a fault fixed-point protection type detection device based on a distribution network. The connection components include a docking plate, a fixing plate and a spring. When the protective cover is opened to use the line fault detector, the fixing plate is directly pressed to leave the positioning groove, and the protective cover can be rotated to open for use. When closing the protective cover, the protective cover is directly rotated onto the protective box so that the bevel can contact the protective box. As the protective cover is closed, the fixing plate can be squeezed into the connection groove so that the docking plate docks in the docking groove. Then the fixing plate can be engaged into the positioning groove under the action of the spring, thereby completing the closure of the protective cover. This method not only prevents the connector between the protective box and the protective cover from being exposed, which is convenient for packaging and transportation, but also makes it easy to open and close the protective cover, which is conducive to the use of the line fault detector and makes the overall detection device have a good use effect.

[0004] The existing opening and closing locking mechanism of the protection box may not be exposed, which is convenient for packaging and transportation. However, the components controlling the opening and closing of the locking mechanism may still be accidentally resisted and triggered, thereby accidentally opening the protection box. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] A fault fixed-point detection device for a distribution network comprises a protection box, a sealing cover is connected to the protection box by a hinge, a line fault detector is built into the protection box, a pair of lock boxes are provided on the front inner surface of the protection box, and a pair of buckles are provided on the front surface of the sealing cover. When the buckles are inserted into the lock boxes, the sealing cover and the protection box are closed and fixed.

[0008] A receiving groove is provided inside the lock box, and an extension groove is integrally connected to the bottom of the receiving groove. A pair of stop rollers are rollingly connected in the receiving groove. When the buckle is plugged into the lock box, the ends abut the stop rollers so that the stop rollers move to both sides to reveal the receiving groove, and the length of the stop rollers is longer than the length of the buckle.

[0009] The bottom of the accommodating groove has arc structures on both sides, and the length of the horizontal section of the bottom of the accommodating groove is equal to the width of the extension groove. The width of the extension groove is smaller than the sum of the diameters of a pair of stop rollers, and a spring is installed in the extension groove.

[0010] Stoppers are symmetrically arranged inside the accommodating groove, and opposite sides of the two stoppers are vertical surfaces, and chamfers are arranged at the bottoms of the stoppers.

[0011] A lever is symmetrically arranged inside the accommodating groove and above the stopper, and a rotating shaft is integrally connected to the inner wall of the lock box at the center of the front and rear ends of the lever, and a coil spring is fixedly connected to the rotating shaft.

[0012] The buckle is an anchor-shaped structure. When the buckle is inserted into the extension groove and pulled upward, the stop roller is located on the buckle, and the side of the stop roller protrudes from the edge of the buckle. A connecting piece is integrally connected to the upper surface of the buckle, and a pull buckle is integrally connected to the outer surface of the connecting piece.

[0013] A connecting hole is provided on the upper surface of the lock box, and the length of the connecting hole is equal to the length of the buckle. Arc grooves are provided at both ends of the buckle, and a rotating bar is movably connected in the groove. The rotating bar is rotatably connected in the arc groove at the end of the buckle by a torsion spring.

[0014] A pair of rectangular notches are provided on the front surfaces of the protective box and the sealing cover, wherein the lock box is installed inside the protective box and located at the notch, the buckle is slidably installed inside the sealing cover and located at the notch, and the width of the connecting piece is larger than the notch. A tension spring is provided on the rear surface of the connecting piece, and the end of the tension spring is connected to the inner upper surface of the sealing cover.

[0015] Universal wheels are installed at the four corners of one end of the protection box, and a hand pull rod is installed on the lower surface of the protection box. A first cooling fan is embedded on one side of the front surface of the protection box, and a second cooling fan is embedded on one side of the rear surface of the protection box.

[0016] The line fault detector comprises a receiver, a display screen, a transmitter and a power supply, and a mounting groove is arranged in the protection box for the receiver, the display screen, the transmitter and the power supply to be embedded and installed.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) In the present application, the line fault detector is placed in a protective box, and the line fault detector is sealed and protected by the protective box. At the same time, multiple cooling fans are installed on the device to dissipate the heat generated when the line fault detector is working, thereby ensuring the normal operation of the line fault detector and preventing it from being damaged due to excessive temperature.

[0019] (2) Since the cooling fan enables the interior of the protective box to be connected with the outside world, in order to prevent dust from entering the protective box through the cooling fan during non-operation, the present application places the main heating elements in the line fault detector separately in an independent cavity and dissipates heat through the cooling fan, while other components that generate relatively less heat are concentrated in another independent cavity, and a cooling fan is installed on the upper surface of the cavity. When the line fault detector is working, the protective box is opened and the cooling fan is started.

[0020] (3) At the same time, in order to facilitate the carrying of the device, a hand handle is installed on the lower surface of the protective box. The installation of the hand handle adopts the same retractable structure as the existing luggage handle structure, so that the hand handle is pulled out when in use, and the protective box is pulled for transportation by the universal wheels set on the other side of the protective box.

[0021] (4) The present application is provided with a locking structure for controlling the opening and closing of the box body and the box cover of the protective box. The locking mechanism is also not exposed, which is convenient for packaging and transportation. The structure of the locking mechanism is relatively simple, which is convenient for operation. The buckle is inserted into the lock box and the buckle is limited by the stop roller in the lock box. The buckle cannot be pulled out of the socket opened on the lock box to complete the locking.

[0022] (5) In the present application, when the buckle is inserted into the lock box, the two fitting stop rollers will be separated first, so that the end of the buckle enters the extension groove. Since the two ends of the buckle are provided with rotating bars through the coil spring, the buckle can enter the extension groove. When the buckle moves upward, the rotating bars are unfolded under the action of the coil spring to lift the two stop rollers. During the process of the buckle continuing to rise, the stop roller will resist in the insertion hole opened on the upper surface of the lock box, so that the buckle cannot be pulled out of the lock box, thereby achieving the fixation between the protective box and the sealing cover. When it needs to be opened, the buckle is moved downward again. During the downward movement of the buckle, the stop roller will be resisted by the end of the lever, so that the stop roller rolls onto the lever and slides back to the bottom of the accommodating groove along the other end of the lever. At this time, the buckle can move upward through the connecting hole of the lock box. In order to prevent one of the two stop rollers from falling into the extension groove due to excessive movement speed, a spring is provided in the extension groove to prevent the stop roller from falling therein. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the appearance structure diagram of the protective box.

[0024] Figure 2 This is the structural diagram of the protective box rollover.

[0025] Figure 3 This is the rear view of the protective box.

[0026] Figure 4 This is a bottom view of the protective box.

[0027] Figure 5 Open the schematic for the shield box.

[0028] Figure 6 Expand the structural diagram for the protective box and its detector.

[0029] Figure 7 This is the structural diagram of the locking mechanism.

[0030] Figure 8 Insert steps for locking mechanism Figure 1 .

[0031] Fig. 9 Insert steps for locking mechanism Figure 2 .

[0032] Fig.10 Locking Mechanism Insertion Steps Figure 3 .

[0033] The corresponding relationship between the illustrations and component names in the figure is as follows:

[0034] 100, protective box; 100a, first cooling fan; 100b, second cooling fan; 100c, hand pull rod; 101, lock box; 101a, receiving groove; 101a-1, extension groove; 101b, lever; 101c, stopper; 101d, stop roller; 200, sealing cover; 201, buckle; 201a, connecting piece; 300, line fault detector; 301, receiver; 302, display screen; 303, transmitter; 304, power supply. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0037] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. The present invention provides the following embodiments.

[0038] Example

[0039] See also Figure 1-5 A fault fixed-point detection device for a distribution network includes a protection box 100, a sealing cover 200 is connected to the protection box 100 by a hinge, a line fault detector is built in the protection box 100, and the line fault detector 300 is protected by a closed structure composed of the protection box 100 and the sealing cover 200. In order to make the protection box 100 and the sealing cover 200 airtight, a locking mechanism is usually required. The traditional key lock is not convenient for opening the protection box 100, while other locking mechanisms are external and easier to trigger. Therefore, in order to facilitate the opening and closing of the protection box 100 and the sealing cover 200, the present application provides a pair of lock boxes 101 on the inner surface of the front end of the protection box 100, and a pair of buckles 201 are provided on the front surface of the sealing cover 200. When the buckles 201 are inserted into the lock boxes 101, the sealing cover 200 and the protection box 100 are closed and fixed.

[0040] exist Figure 7 and 10In the embodiment, a receiving groove 101a is provided inside the lock box 101, and an extension groove 101a-1 is integrally connected to the bottom of the receiving groove 101a. A pair of stop rollers 101d are rollingly connected in the receiving groove 101a. When the buckle 201 is plugged into the lock box 101, the end thereof abuts against the stop rollers 101d, causing the stop rollers 101d to move to both sides. After the stop rollers 101d are separated by the buckle 201, the extension groove 101a-1 is revealed, so that the end of the buckle 201 enters the extension groove 101a-1. The buckle 201 is a ship The anchor-like structure makes the upper surface of the buckle 201 an arc-shaped structure with the arc surface facing inward, so that the blocking roller 101d can roll down into the arc-shaped groove on the upper surface of the buckle 201. When the buckle 201 is inserted into the extension groove 101a-1 and pulled upward, the blocking roller 101d is lifted by the buckle 201. A connecting piece 201a is integrally connected to the upper surface of the buckle 201, and a pull buckle is integrally connected to the outer surface of the connecting piece 201a. The pull buckle is used to manually push the connecting piece 201a downward, so that the connecting piece 201a can be pulled upward. a drives the plug buckle 201 to move into the lock box 101. When the plug buckle 201 is inserted into the extension groove 101a-1 and lifts the blocking roller 101d, a tension spring is provided on the rear surface of the connecting piece 201a, and the end of the tension spring is connected to the inner upper surface of the sealing cover 200. The tension spring is used to pull the connecting piece 201a upward, so that the plug buckle 201 drives the blocking roller 101d to move toward the connecting hole opened on the upper surface of the lock box 101. Since the plug buckle 201 needs to enter the lock box 101 through the connecting hole, Therefore, the maximum length of the buckle 201 cannot exceed the length of the connection hole. In order to ensure the contact area, the length of the buckle 201 is set to be equal to the length of the connection hole, and the length of the blocking roller 101d is longer than the length of the buckle 201. Therefore, the length of the blocking roller 101d is greater than the length of the connection hole. When the buckle 201 drives the blocking roller 101d to move toward the connection hole, the blocking roller 101d abuts against the connection hole, so that the buckle 201 cannot be pulled out of the connection hole, thereby achieving locking;Furthermore, in order to facilitate the insertion of the buckle 201 into the extension groove 101a-1, so that the buckle 201 is located below the blocking roller 101d and lifts the blocking roller 101d after rising, the present application provides arc grooves at both ends of the buckle 201, and a rotating bar is movably connected in the groove, and the rotating bar is rotatably connected to the arc groove at the end of the buckle 201 by a torsion spring. In order to ensure that the blocking roller 101d will roll down to the upper surface of the buckle 201 after the buckle 201 separates from the blocking roller 101d and enters the extension groove 101a-1, the bottom two sides of the accommodating groove 101a are arc structures. With this structure, when the buckle 201 blocks After the roller 101d is separated, a certain resistance force will be generated on the blocking roller 101d. The blocking roller 101d rolls toward the two ends of the receiving groove 101a through the resistance force. When the buckle 201 enters the extension groove 101a-1, the blocking roller 101d will move in the opposite direction to reset due to the arc-shaped structures on both sides of the bottom of the receiving groove 101a, so as to roll down to the upper surface of the buckle 201. The length of the horizontal section at the bottom of the receiving groove 101a is equal to the width of the extension groove 101a-1. The width of the extension groove 101a-1 is less than the sum of the diameters of the pair of blocking rollers 101d, and a spring is installed in the extension groove 101a-1. ;

[0041] In the above embodiment, in the present application, when the buckle 201 is inserted into the lock box 101, the two fitted stop rollers 101d will be separated first, so that the end of the buckle 201 enters the extension groove 101a-1. Since the two ends of the buckle 201 are provided with rotating bars through coil springs, the buckle 201 can enter the extension groove 101a-1. When the buckle 201 moves upward, the rotating bars are unfolded under the action of the coil spring to lift the two stop rollers 101d. When the buckle 201 continues to rise, the stop rollers 101d will resist in the insertion hole opened on the upper surface of the lock box 101, so that the buckle 201 cannot be pulled out of the lock box 101, thereby achieving the fixation between the protective box 100 and the sealing cover 200.

[0042] exist Figure 7 and 10In the middle, the side of the stop roller 101d protrudes from the edge of the buckle 201. In order to keep the stop roller 101d stable when it is lifted up by the buckle 201, stoppers 101c are symmetrically arranged inside the accommodating groove 101a. During the rising process of the stop roller 101d, it is protected by the stopper 101c and will not fall. The spacing between the stoppers 101c is equal to the sum of the diameter of a pair of stop rollers 101d and the thickness of the connecting piece. The opposite sides of the two stoppers 101c are vertical surfaces to ensure that the stop roller 101d will not be blocked during the rising process and cannot rise. The bottom of the stopper 101c is set The chamfered corners are convenient for the blocking roller 101d to avoid being interfered with by the bottom of the blocking block 101c when it contacts the blocking block 101c, so that the blocking roller 101d cannot enter the side of the blocking block 101c. When the protective box 100 needs to be opened, the connecting piece 201a is manually pushed downward by the lever, so that the plug buckle 201 moves downward again. When the plug buckle 201 moves downward, a lever 101b is symmetrically arranged inside the accommodating groove 101a and above the blocking block 101c, and a rotating shaft is integrally connected to the inner wall of the lock box 101 at the center of the front and rear ends of the lever 101b. A coil spring is fixedly connected to the shaft, and the blocking roller 101d will be resisted by the end of the lever 101b, so that the blocking roller 101d rolls onto the lever 101b, and slides back to the bottom of the accommodating groove 101a along the other end of the lever 101b. At this time, the buckle 201 can move upward through the connecting hole of the lock box 101. In order to prevent one of the two blocking rollers 101d from falling into the extension groove 101a-1 due to excessive movement speed, a spring is arranged in the extension groove 101a-1 to prevent the blocking roller 101d from falling into it. Furthermore, in order to facilitate manual Push the connecting piece 201a integrally connected to the buckle 201, so that the connecting piece 201a can drive the buckle 201 to move downward into the lock box 101 under manual push, and a pair of rectangular notches are opened on the front surface of the protection box 100 and the front surface of the sealing cover 200, wherein the lock box 101 is installed inside the protection box 100 and is located at the notch, and the buckle 201 is slidably installed inside the sealing cover 200 and is located at the notch, and the notch is used to show the connecting piece 201a to facilitate manual operation, and the width of the connecting piece 201a is greater than the notch and can cover the notch.

[0043] It is worth noting that the set block 101c can not only protect the blocking roller 101d and prevent the blocking roller 101d from falling when the buckle 201 drives the blocking roller 101d to rise, but also can separate the rising and falling paths of the blocking roller 101d. When the blocking roller 101d rises, its rising path is located between the inner sides of the two blocks 101c, and when the blocking roller 101d is resisted by the lever 101b and rolls to the bottom of the accommodating groove 101a, it will be in the falling channel between the outer sides of the two blocks 101c and the inner wall of the accommodating groove 101a.

[0044] exist Figure 1-5 In order to facilitate the carrying of the device in the protective box 100, universal wheels are installed at the four corners of one end of the protective box 100, and a hand pull rod 100c is installed on the lower surface of the protective box 100. The installation of the hand pull rod 100c adopts the same pull rod structure of the existing luggage and can be retracted, so that when in use, the hand pull rod 100c is pulled out, and the protective box is transported by pulling the universal wheel set on the other side of the protective box 100. A first cooling fan 100a is embedded on one side of the front surface of the protective box 100, and a second cooling fan 100a is embedded on one side of the rear surface of the protective box 100. Fan 100b, a first cooling fan 100a and a second cooling fan 100b are installed on the protective box 100 to dissipate the heat generated when the line fault detector 300 is working, thereby ensuring the normal operation of the line fault detector 300 and preventing it from being damaged due to excessive temperature; the line fault detector 300 includes a receiver 301, a display screen 302, a transmitter 303 and a power supply 304, and an installation groove is provided in the protective box 100 for the receiver 301, the display screen 302, the transmitter 303 and the power supply 304 to be embedded and installed.

[0045] It is worth noting that the Figure 5 and attached Figure 6 It can be seen that a fan is also installed on the fault detector 300 and the protective box 10 is provided with two independent cavities. This is because the first cooling fan 100a and the second cooling fan 100b enable the interior of the protective box 100 to be connected with the outside world. Therefore, in order to prevent dust from entering the interior of the protective box 100 through the mounting holes of the first cooling fan 100a and the second cooling fan 100b during non-operation, the present application places the main heating element power supply 304 in the line fault detector 300 separately in an independent cavity, and dissipates heat through the first cooling fan 100a and the second cooling fan 100b, while other components with relatively less heat are concentratedly installed in another independent cavity, and a fan is installed on the upper surface of the cavity. When the line fault detector 300 is working, the protective box 100 is opened and the fan is started for heat dissipation. When the sealing cover 20 is closed, no external dust will enter.

[0046] In summary, the line fault detector 300 is placed in the protective box 100, and the line fault detector 300 is sealed and protected by the protective box 100. At the same time, the first cooling fan 100a and the second cooling fan 100b are installed on the device to dissipate the heat generated when the line fault detector 300 is working, thereby ensuring the normal operation of the line fault detector 300 and preventing it from being damaged due to excessive temperature. In order to facilitate the carrying of the device, a hand pull rod 100c is installed on the lower surface of the protective box 100. The installation of the hand pull rod 100c adopts the same pull rod structure of the existing luggage and can be retracted, so that the hand pull rod 100c can be pulled out when in use, and the hand pull rod 100c is set on the other side of the protective box 100. The universal wheel pulls the protective box 100 for transportation, and a locking structure is provided to control the opening and closing of the box body and the sealing cover 200 of the protective box 100. The locking mechanism is also not exposed, which is convenient for packaging and transportation, and the structure of the locking mechanism is relatively simple, which is convenient for operation. It is mainly through inserting the buckle 201 into the lock box 101, and using the stop roller 101d in the lock box 101 to limit the buckle 201 so that the buckle 201 cannot be pulled out from the connecting hole opened on the lock box 200 to complete the locking. In the present application, when the buckle 201 is inserted into the lock box 101, the two fitted stop rollers 101d will be separated first, so that the end of the buckle 201 enters the extension groove 101a-1. The two ends of the lock box 101 are provided with rotating strips through coil springs, so that the plug buckle 201 can enter the extension groove 101a-1. When the plug buckle 201 moves upward, the rotating strip is expanded under the action of the coil spring to lift the two blocking rollers 101d. When the plug buckle 201 continues to rise, the blocking rollers 101d will resist the insertion holes opened on the upper surface of the lock box 101, so that the plug buckle 201 cannot be pulled out of the lock box 101, thereby achieving the fixation between the protection box 100 and the sealing cover 200. When the protection box 100 needs to be opened, the connecting piece 201a is manually pushed downward by the pull button, so that the plug buckle 201 moves downward again. When the plug buckle 201 moves downward, it is located inside the accommodating groove 101a and at the blocking roller. A lever 101b is symmetrically arranged above the block 101c, and a rotating shaft is integrally connected to the inner wall of the lock box 101 at the center of the front and rear ends of the lever 101b, and a coil spring is fixedly connected to the rotating shaft, and the blocking roller 101d will be resisted by the end of the lever 101b, so that the blocking roller 101d rolls onto the lever 101b, and slides down to the bottom of the accommodating groove 101a along the other end of the lever 101b. At this time, the buckle 201 can move upward through the connecting hole of the lock box 101, and in order to prevent one of the two blocking rollers 101d from falling into the extension groove 101a-1 due to excessive movement speed, a spring is arranged in the extension groove 101a-1 to prevent the blocking roller 101d from falling therein;Further, in order to facilitate manual pushing of the connecting piece 201a integrally connected to the plug buckle 201, so that the connecting piece 201a can drive the plug buckle 201 to move downward into the lock box 101 under manual pushing, a pair of rectangular notches are provided on the front surface of the protection box 100 and the front surface of the sealing cover 200, wherein the lock box 101 is installed inside the protection box 100 and is located at the notch, and the plug buckle 201 is slidably installed inside the sealing cover 200 and is located at the notch, and the notch is used to show the connecting piece 201a, so as to facilitate manual operation, and the width of the connecting piece 201a is greater than the notch and can cover the notch. ;

[0047] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the scope of protection determined by the claims submitted for the present invention.

Claims

1. A fault fixed-point detection device for a distribution network, comprising a protection box (100), a sealing cover (200) being connected to the protection box (100) by a hinge, and a line fault detector (300) being built in the protection box (100). Features: A pair of lock boxes (101) are provided on the inner surface of the front end of the protection box (100), and a pair of plug buckles (201) are provided on the front surface of the sealing cover (200). When the plug buckles (201) are inserted into the lock boxes (101), the sealing cover (200) and the protection box (100) are closed and fixed.

2. The fault fixed-point detection device for a distribution network according to claim 1, characterized in that: A receiving groove (101a) is provided inside the lock box (101), and an extension groove (101a-1) is integrally connected to the bottom of the receiving groove (101a). A pair of blocking rollers (101d) are rollingly connected in the receiving groove (101a). When the plug buckle (201) is plugged into the lock box (101), the ends thereof abut against the blocking rollers (101d), causing the blocking rollers (101d) to move to both sides to reveal the receiving groove (101a), and the length of the blocking rollers (101d) is longer than the length of the plug buckle (201).

3. The fault fixed-point detection device for a distribution network according to claim 2, characterized in that: Both sides of the bottom of the accommodating groove (101a) are arc-shaped structures, and the length of the horizontal section of the bottom of the accommodating groove (101a) is equal to the width of the extension groove (101a-1), the width of the extension groove (101a-1) is smaller than the sum of the diameters of a pair of stop rollers (101d), and a spring is installed in the extension groove (101a-1).

4. The fault fixed-point detection device for a distribution network according to claim 3, characterized in that: Stoppers (101c) are symmetrically arranged inside the containing groove (101a), and opposite surfaces of the two stoppers (101c) are vertical surfaces, and the bottoms of the stoppers (101c) are chamfered.

5. The fault fixed-point detection device for a distribution network according to claim 4, characterized in that: A lever (101b) is symmetrically arranged inside the receiving groove (101a) and above the stopper (101c), and a rotating shaft is integrally connected to the inner wall of the lock box (101) at the center of the front and rear ends of the lever (101b), and a coil spring is fixedly connected to the rotating shaft.

6. The fault fixed-point detection device for a distribution network according to claim 2, characterized in that: The plug buckle (201) is an anchor-shaped structure. When the plug buckle (201) is inserted into the extension groove (101a-1) and pulled upward, the stop roller (101d) is located on the plug buckle (201), and the side of the stop roller (101d) protrudes from the edge of the plug buckle (201). A connecting piece (201a) is integrally connected to the upper surface of the plug buckle (201), and a pull buckle is integrally connected to the outer surface of the connecting piece (201a).

7. The fault fixed-point detection device for a distribution network according to claim 6, characterized in that: A connection hole is provided on the upper surface of the lock box (101), and the length of the connection hole is equal to the length of the buckle (201). Arc grooves are provided at both ends of the buckle (201), and a rotating bar is movably connected in the groove. The rotating bar is rotatably connected in the arc groove at the end of the buckle (201) by a torsion spring.

8. The fault fixed-point detection device for a distribution network according to claim 7, characterized in that: A pair of rectangular notches are provided on the front surface of the protection box (100) and the front surface of the sealing cover (200), wherein the lock box (101) is installed inside the protection box (100) and is located at the notch, the buckle (201) is slidably installed inside the sealing cover (200) and is located at the notch, and the width of the connecting piece (201a) is greater than the notch, and a tension spring is provided on the rear surface of the connecting piece (201a), and the end of the tension spring is connected to the inner upper surface of the sealing cover (200).

9. The fault fixed-point detection device for a distribution network according to claim 1, characterized in that: Universal wheels are installed at the four corners of one end of the protection box (100), and a hand pull rod (100c) is installed on the lower surface of the protection box (100). A first heat dissipation fan (100a) is embedded on one side of the front surface of the protection box (100), and a second heat dissipation fan (100b) is embedded on one side of the rear surface of the protection box (100).

10. The fault fixed-point detection device for a distribution network according to claim 1, characterized in that: The line fault detector (300) comprises a receiver (301), a display screen (302), a transmitter (303) and a power supply (304), and a mounting groove is provided in the protection box (100) for the receiver (301), the display screen (302), the transmitter (303) and the power supply (304) to be mounted and installed.

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