Electric meter box internal fault detection device

Abstract

The invention discloses an electric meter box internal fault detection device, and relates to the technical field of electric meter box internal fault detection. Comprising a shell and jaws, the two oppositely-arranged jaws are installed at the top of the shell, a pushing frame is vertically arranged on the surface of the shell in a limiting and sliding mode, two sliding tables are installed on the surface of the jaw located on the left side of the shell, sliding rods are arranged in the sliding tables in a limiting and sliding mode, and abutting rods are installed at the ends, close to the interiors of the jaws, of the sliding rods. According to the invention, through arrangement of the pushing frame, the sliding table, the sliding rod and the abutting rod, a cable can be clamped and limited when the equipment detects electric leakage of the cable in an electric meter box, and the cable is located in the central area of the jaw during detection, so that the contact position of a detection probe and the cable is ensured to be accurate and symmetrical; and the situation that the position of the unlimited cable is easy to shake due to slight touch in the detection process, so that the current magnetic field of the surrounding cable is superposed in the magnetic field of the detected cable, and the detection value jumps is avoided.

Description

Technical Field

[0001] This invention relates to the field of fault detection technology inside electric meter boxes, specifically to a fault detection device for inside electric meter boxes. Background Technology

[0002] Meter boxes, as devices for installing and protecting electricity meters, play an indispensable role in power systems. Most meter boxes currently in use are made of metal. When a leakage occurs in the meter or wiring, the metal casing of the meter box will also become live, posing a risk of electric shock and even death to workers and pedestrians. It can also cause electrical fires. Leakage current detectors use specific technologies and equipment to monitor the internal wiring and electrical components (such as meters, switches, and terminals) of the meter box for abnormal current leakage and promptly issue warnings or trigger protective actions. Their core purpose is to prevent safety risks such as electric shock accidents, electrical fires, and equipment damage caused by leakage, ensuring the stable operation of the power system and the safety of personnel. Therefore, leakage current detectors are necessary to ensure safety.

[0003] Existing clamp-type leakage current detectors require the cable to be positioned in the central area of ​​the clamp when testing cables inside a meter box. When the cable passes through the clamp, the magnetic field generated by the current in the cable induces an electromotive force in a coil within the clamp, which is then processed by the circuit to obtain the current value. When the cable is in the central area of ​​the clamp, the magnetic field distribution is most uniform, and the intensity of the induced magnetic field in the coil more accurately reflects the actual current in the cable. However, existing equipment makes it inconvenient to position the cable in the center of the clamp during measurement, thus affecting the test results. Furthermore, due to differences in cable specifications, smaller cables are farther from the current transformer, resulting in a weaker alternating magnetic field, which diffuses radially outward along the cable, causing the displayed current value to be lower than the actual current value.

[0004] To address the aforementioned issues, innovative design based on existing methods is urgently needed. Summary of the Invention

[0005] The purpose of this invention is to provide a fault detection device inside an electric meter box, which solves the problem in the background art where it is inconvenient to place the cable in the center of the clamp when measuring the cable, which affects the detection results. Furthermore, due to the different specifications of the cables, the alternating magnetic field strength generated by the cables is relatively weak, causing the current value displayed by the instrument to be less than the actual current value. The technical solution of this invention addresses the problem that the existing technical solutions are too simplistic and provides a solution that is significantly different from the existing technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fault detection device inside an electric meter box, comprising a housing and jaws, wherein two opposing jaws are installed on the top of the housing, a pusher is vertically limited and slidable on the surface of the housing, two sets of slides are installed on the surface of the jaws on the left side of the housing, a slide rod is limited and slidable inside the slides, an abutment rod is installed at one end of the slide rod near the inside of the jaws, a sensing block is provided in the sliding groove inside the jaws, a centering adjustment mechanism is provided on the surface of the jaws, and a sensing adjustment mechanism is installed inside the jaws; The centering adjustment mechanism includes a connecting platform mounted on the surface of the jaws, a thin rod that slides within the connecting platform, an mounting plate mounted on one end of the thin rod away from the sliding platform, an abutment block mounted on the other end of the thin rod, a pressing rod mounted on the surface of the mounting plate, and a pressing block mounted on the top of the pusher frame.

[0007] Preferably, the pusher is elastically connected to the inner wall of the groove on the surface of the housing; a ball bearing is rotatably connected to one end of the abutment rod near the inside of the jaws; a tension spring is installed at the other end of the abutment rod, and the other end of the tension spring is connected to the end of the slide table near the inside of the jaws.

[0008] Preferably, the top protrusions of the two sets of internal slide rods of the slide table are limited to slide within the slide grooves on the slide table surface, and telescopic rods are installed on the surfaces of the two sets of internal slide rods of the slide table.

[0009] Preferably, the slide table has a groove inside, and the groove size at the end of the slide table near the slide rod is larger than the notch at the end of the slide table away from the slide rod; a protrusion is installed at the end of the slide rod away from the jaws, and the protrusion slides and engages with the groove at the end of the slide table away from the jaws; the surface of the slide rod slides and engages with the notch at the end of the slide table near the jaws.

[0010] Preferably, both the sidewall of the slide table and the interior of the slide rod are provided with square grooves, and the right end of the square groove on the sidewall of the slide table coincides with the left end of the square groove inside the slide rod.

[0011] Preferably, the inner square groove of the slide bar has a rounded corner at one end near the inside of the jaws, and both the abutting block and the squeezing block are trapezoidal blocks. The inclined surface of the abutting block contacts the inner square groove of the slide bar at one end near the inside of the jaws.

[0012] Preferably, a spring is installed on the surface of the connecting platform, and the other end of the spring is connected to the mounting plate. A limit rod is installed on the surface of the connecting platform, and the limit rod slides within the mounting plate. The extrusion rod has an L-shaped design, and the end of the extrusion rod away from the mounting plate contacts the inclined surface of the extrusion block.

[0013] Preferably, the sensing adjustment mechanism includes a contact plate installed on the inner wall of the jaw cavity, and a connecting rod that slides within a notch on the jaw surface. The top of the connecting rod is connected to a slide rod, and a square platform is installed at the bottom of the connecting rod. The end of the square platform away from the inner wall is connected to the sensing block.

[0014] Preferably, the contact plate is made of metal, and a thin metal rod is installed on its surface. The side end of the square platform protrudes and slides on the surface of the thin rod. A spring is installed inside the square platform, and the other end of the spring contacts the contact plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention, through the design of a pusher, slide, slide bar, and abutment bar, enables the device to clamp and limit the cable during leakage current detection inside the meter box, ensuring that the cable is positioned in the central area of ​​the clamp jaws during detection. Fixing the cable in the central area of ​​the clamp jaws ensures accurate and symmetrical contact between the detection probe and the cable. This prevents cables that are not clamped from shifting due to slight contact during detection, which could cause the magnetic field of surrounding cables to superimpose on the magnetic field of the cable under test, resulting in a "jump" in the detection value. The "rigid fixation" formed by clamping and limiting prevents cable swaying, ensures a stable distance between the cable under test and surrounding interference sources, and prevents dynamic interference from affecting the leakage current detection signal, significantly reducing the false judgment rate.

[0016] This invention, through a central adjustment mechanism, enables the clamps to limit and hold cables of different specifications. If the positions of different specifications of cables in the clamps are not fixed, uneven magnetic field induction may occur due to their proximity or distance from the current transformer, resulting in detection errors. The central adjustment mechanism can accurately position cables of different specifications in the central area of ​​the clamps, so that the magnetic field generated by the cables can be uniformly sensed by the current transformer, reducing measurement errors caused by positional deviations and improving the accuracy of leakage current detection.

[0017] This invention, through a specially designed induction adjustment mechanism, ensures that the distance between the induction block and cables of different specifications remains consistent while the jaws limit and clamp different cables. When detecting cables of different diameters, the induction block can automatically adjust its position by moving the contact rod, so that the distance between the cable surface and the induction block remains constant. This design ensures the consistency of the magnetic field strength. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a partial structural diagram of the jaws of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A; Figure 4This is a partial cross-sectional structural diagram of the jaws of the present invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point B; Figure 6 This is a partial structural schematic diagram of the centering adjustment mechanism of the present invention; Figure 7 This is an exploded view of the central adjustment mechanism of the present invention; Figure 8 This is a partial structural schematic diagram of the sensing and adjustment mechanism of the present invention.

[0019] In the diagram: 1. Housing; 2. Jaws; 3. Pusher frame; 4. Slide table; 5. Slide rod; 6. Abutment rod; 7. Telescopic rod; 8. Sensing block; 901. Connecting platform; 902. Mounting plate; 903. Abutment block; 904. Pressing rod; 905. Pressing block; 101. Contact plate; 102. Connecting rod; 103. Square platform. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-8 This invention provides a technical solution: a fault detection device inside an electric meter box, comprising a housing 1 and jaws 2. Two opposing jaws 2 are installed on the top of the housing 1. A pusher 3 is vertically limited and slidable on the surface of the housing 1, and the pusher 3 is elastically connected to the inner wall of a groove on the surface of the housing 1. A ball bearing is rotatably connected to one end of an abutment rod 6 near the inside of the jaws 2. A tension spring is installed at the other end of the abutment rod 6, and the other end of the tension spring is connected to one end of a slide 4 near the inside of the jaws 2. Two sets of slides 4 are installed on the surface of the jaws 2 on the left side of the housing 1. The protrusion at the top of the slide rod 5 inside the two sets of slides 4 slides within a groove on the surface of the slide 4, and the protrusion fits into a groove on the side of the slide 4 away from the jaws 2. The groove of the slide 4 has a "variable diameter design", with a larger groove size at the end near the slide rod 5 and a narrower opening at the end away from the slide rod 5. The surface of the slide rod 5 fits into the narrow opening of the slide 4 near the inside of the jaws 2, forming a "bidirectional limiting". The sliding constraint is that the sliding rod 5 inside the two sets of sliding tables 4 is equipped with a telescopic rod 7, the sliding rod 5 is limited to slide inside the sliding table 4, the sliding rod 5 is equipped with an abutment rod 6 at one end of the sliding rod 5 near the inside of the jaw 2, the sliding groove inside the jaw 2 is equipped with a sensing block 8, the surface of the jaw 2 is equipped with a centering adjustment mechanism, and the inside of the jaw 2 is equipped with a sensing adjustment mechanism. The slide table 4 has a groove inside, and the size of the groove at the end of the slide table 4 near the slide rod 5 is larger than the notch at the end of the slide table 4 away from the slide rod 5; a protrusion is installed at the end of the slide rod 5 away from the jaw 2, and the protrusion slides and engages in the groove at the end of the slide table 4 away from the jaw 2; the surface of the slide rod 5 slides and engages in the notch at the end of the slide table 4 near the jaw 2; square grooves are provided on the side wall of the slide table 4 and inside the slide rod 5, and the right end of the square groove on the side wall of the slide table 4 coincides with the left end of the square groove inside the slide rod 5; Fixing the cable in the central area of ​​jaw 2 ensures accurate and symmetrical contact between the probe and the cable, preventing the cable from shifting due to slight contact during testing. This would cause the magnetic field of the surrounding cables to be superimposed on the magnetic field of the cable under test, resulting in a "jump" in the test value. The "rigid fixation" formed by the clamping and limiting prevents the cable from shaking, ensuring a stable distance between the cable under test and surrounding interference sources, so that the leakage current detection signal is not subject to dynamic interference, and significantly reducing the false judgment rate.

[0022] In one embodiment of the present invention, the centering adjustment mechanism includes a connecting platform 901 mounted on the surface of the jaws 2. A thin rod is slidably limited inside the connecting platform 901. A mounting plate 902 is mounted on one end of the thin rod away from the slide table 4, and an abutment block 903 is mounted on the other end of the thin rod. A spring is mounted on the surface of the connecting platform 901, and the other end of the spring is connected to the mounting plate 902. A limiting rod is mounted on the surface of the connecting platform 901 and slides within the mounting plate 902. The pressing rod 904 is L-shaped, and the end of the pressing rod 904 away from the mounting plate 902 contacts the inclined surface of the pressing block 905. The pressing rod 904 is mounted on the surface of the mounting plate 902. The mechanism also includes a pressing block 905 mounted on the top of the pusher frame 3. The square groove inside the slide rod 5 has a rounded corner near the inside of the jaws 2. Both the abutment block 903 and the pressing block 905 are trapezoidal blocks. The inclined surface of the abutment block 903 contacts the end of the square groove inside the slide rod 5 near the inside of the jaws 2. The connecting platform 901... The surface spring is connected to the mounting plate 902. When the pressing rod 904 pushes the slide rod 5 to clamp the cable, the spring will undergo elastic deformation as the mounting plate 902 slides. If the cable diameter is small, the spring compression is small and the clamping force is gentle; if the cable diameter is large, the spring compression increases and the clamping force increases accordingly. This "elastic buffer" design, together with the ball bearing at the end of the contact rod 6, can ensure a firm clamping while avoiding hard contact that could scratch or damage the cable insulation layer. It is especially suitable for scenarios where the electrical meter box contains mostly thin-insulated low-voltage cables. Open jaw 2 and place the cable from the meter box into jaw 2. The electromagnetic coil inside jaw 2 detects the electromagnetic field on the cable surface. As the cable enters jaw 2, it pushes the pusher 3 towards jaw 2. The movement of the pusher 3 causes the pressing block 905 to move as well. The inclined surface of the pressing block 905 then contacts the pressing rod 904 and applies pressure. The pressing rod 904, under pressure, moves the mounting plate 902. Because the limiting rod on the surface of the connecting platform 901 slides within the mounting plate 902, the movement of the mounting plate 902 causes its thin rod to slide within the connecting platform 901, thus pushing the contact block 903 towards the slide table 4. At this point, the end of the contact block 903 inserts into the gap where the slide rod 5 overlaps with the square groove of the slide table 4, and the inclined surface of the contact block 903 contacts the end of the square groove of the slide rod 5 near the contact rod 6. The movement of the contact block 903 pushes the slide rod 5 to slide within the slide table 4. The protrusion at the end of the slide rod 5 away from the contact rod 6 limits the slide rod 5, preventing it from slipping out of the slide table 4. When the slide rod 5 slides, it drives another slide rod 5 to slide together in another set of slide tables 4 through the telescopic rod 7, thereby driving the contact rod 6 to gradually move towards the cable until the ball bearing on the surface of the contact rod 6 contacts the cable and clamps the cable, placing it in the central area of ​​the jaw 2. This allows the jaw 2 to limit and clamp cables of different specifications. If the position of different specifications of cables in the jaw 2 is not fixed, the magnetic field induction may be uneven due to being close to or far from the current transformer, resulting in detection errors. The centering adjustment mechanism can accurately position cables of different specifications in the central area of ​​the jaw 2, so that the magnetic field generated by the cable can be uniformly induced by the current transformer, reducing measurement errors caused by position deviation.

[0023] In one embodiment of the present invention, the sensing adjustment mechanism includes a contact plate 101 installed on the inner wall of the cavity of the jaw 2, and a connecting rod 102 that slides within a notch on the surface of the jaw 2. The top of the connecting rod 102 is connected to the slide rod 5, and a square platform 103 is installed at the bottom of the connecting rod 102. The end of the square platform 103 away from the inner wall is connected to the sensing block 8. The contact plate 101 is made of metal, and a thin rod made of metal is installed on its surface. The side end of the square platform 103 protrudes and slides within the surface of the thin rod. A spring is installed inside the square platform 103, and the other end of the spring contacts the contact plate 101. While the slide bar 5 moves the contact bar 6, the connecting rod 102 at the side of the slide bar 5 drives the protrusion at the side of the square platform 103 to slide on the upper limit of the thin rod on the surface of the contact plate 101, so that the sensing block 8 gradually contacts the cable. When the cable size is small, it can better sense the changes in the magnetic field around the cable. While the jaws 2 limit and clamp different cables, it can ensure that the distance between the sensing block 8 and cables of different sizes remains consistent. When detecting cables of different diameters, the sensing block 8 can automatically adjust its position through the movement of the contact bar 6, so that the distance between the cable surface and the sensing block 8 always remains constant, ensuring the consistency of the magnetic field strength.

[0024] Working principle: During testing, jaws 2 are first opened, and the cable from the meter box is placed inside jaws 2. At this time, the electromagnetic coil inside jaws 2 detects the electromagnetic field on the surface of the cable. When the cable enters jaws 2, it pushes the pusher 3 towards jaws 2. The movement of the pusher 3 causes the pressing block 905 to move as well. The inclined surface of the pressing block 905 then contacts the pressing rod 904 and applies pressure. The pressing rod 904, under pressure, causes the mounting plate 902 to move as well. Because the limiting rod on the surface of the connecting platform 901 slides within the mounting plate 902, the movement of the mounting plate 902 causes its surface rod to slide within the connecting platform 901, thus pushing and contacting the pressing rod. Block 903 moves toward the slide table 4. At this time, the end of the contact block 903 is inserted into the gap where the slide rod 5 and the square groove of the slide table 4 overlap. The inclined surface of the contact block 903 abuts against the square groove of the slide rod 5 near the end of the contact rod 6. At this time, the movement of the contact block 903 pushes the slide rod 5 to slide within the slide table 4. The protrusion at the end of the slide rod 5 away from the contact rod 6 limits the slide rod 5 and prevents it from slipping out of the slide table 4. When the slide rod 5 slides, it drives another slide rod 5 to slide together in another set of slide tables 4 through the telescopic rod 7, thereby driving the contact rod 6 to gradually move toward the cable until the ball bearing on the surface of the contact rod 6 contacts the cable and clamps the cable, so that it is in the central area of ​​the jaw 2. While the slide bar 5 moves the contact bar 6, the side connecting rod 102 of the slide bar 5 drives the side protrusion of the square platform 103 to slide on the upper limit of the thin rod on the surface of the contact plate 101, so that the sensing block 8 gradually contacts the cable. When the cable specification is small, it can better sense the changes in the magnetic field around the cable. After the test is completed, the pusher 3 is released. At this time, the tension spring at the end of the contact rod 6 near the slide rod 5 loses its tension and automatically resets, pushing the slide rod 5 to move away from the jaw 2. The spring inside the square platform 103 loses its tension and drives the sensing block 8 to reset. While the slide rod 5 moves, it makes reverse contact with the inclined surface of the contact block 903, causing it to move to the initial position. When the contact block 903 moves due to the reverse contact, it drives the pressing rod 904 to move, and the pressing block 905 makes the pusher 3 return to its original position.

[0025] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An electrical meter box internal fault detection device comprising a housing (1) and a jaw (2), characterized in that: The shell (1) top is provided with two opposite setting jaw (2), the shell (1) surface vertical limit sliding has push frame (3), the surface of the left side jaw (2) in the shell (1) is provided with two groups of slide platform (4), the slide platform (4) inside limit sliding has slide rod (5), the slide rod (5) is close to the inside one end of jaw (2) and is installed with the abutment rod (6), the inside slide groove of jaw (2) is provided with induction block (8), the surface of jaw (2) is provided with centering adjusting mechanism, the inside jaw (2) is installed with induction adjusting mechanism; The centering adjusting mechanism includes a connecting table (901) installed on the surface of the jaw (2), a thin rod limitingly sliding in the connecting table (901), an installation plate (902) installed on the end of the thin rod away from the slide platform (4), an abutment block (903) installed on the other end of the thin rod, an extrusion rod (904) installed on the surface of the installation plate (902), and an extrusion block (905) installed on the top of the push frame (3).

2. The internal fault detection device for an electric meter box according to claim 1, characterized in that: The push frame (3) is elastically connected with the inner wall of the surface sliding groove of the shell (1); the abutment rod (6) is rotatably connected with a ball bearing at the end close to the inside of the jaw (2); and the other end of the abutment rod (6) is connected with the end of the slide platform (4) close to the inside of the jaw (2).

3. The apparatus for detecting internal faults of an electric meter box according to claim 1, wherein: The top end protrusions of the two sets of slide rods (5) inside the slide platforms (4) limitingly slide in the surface sliding grooves of the slide platforms (4); and the surfaces of the slide rods (5) inside the slide platforms (4) are provided with telescopic rods (7).

4. The apparatus for detecting internal faults of an electric meter box according to claim 3, wherein: The slide platforms (4) are provided with recesses inside, and the size of the recess close to the end of the slide rod (5) of the slide platform (4) is greater than that of the recess away from the end of the slide rod (5) of the slide platform (4); the slide rod (5) is provided with a protrusion at the end away from the jaw (2), and the protrusion is embeddedly and slidably arranged in the recess at the end away from the inside of the jaw (2) of the slide platform (4); and the surface of the slide rod (5) is embeddedly and slidably arranged in the recess at the end close to the inside of the jaw (2) of the slide platform (4).

5. An electrical meter box internal fault detection apparatus as claimed in claim 4, wherein: The side walls of the slide platforms (4) and the inside of the slide rods (5) are both provided with square grooves, and the right end area of the square groove of the side wall of the slide platform (4) is coincided with the left end area of the square groove of the inside of the slide rod (5).

6. The electrical meter box internal fault detection apparatus of claim 1, wherein: The inside of the square groove of the slide rod (5) is provided with a rounded corner close to the inside of the jaw (2); the abutment block (903) and the extrusion block (905) are both designed as trapezoidal blocks; and the inclined surface of the abutment block (903) is in contact with the inside of the square groove of the slide rod (5) close to the inside of the jaw (2).

7. The apparatus for detecting internal faults of an electric meter box according to claim 1, wherein: The surface of the connecting table (901) is provided with a spring, the other end of the spring is connected with the installation plate (902), the surface of the connecting table (901) is provided with a limiting rod, the limiting rod is limitingly and slidably arranged in the inside of the installation plate (902), the extrusion rod (904) is designed as an L shape, and the end of the extrusion rod (904) away from the installation plate (902) is in contact with the inclined surface of the extrusion block (905).

8. The electrical meter box internal fault detection apparatus of claim 1, wherein: The induction adjusting mechanism comprises a contact plate (101) mounted on the inner wall of the cavity of the jaw (2), and a connecting rod (102) slidingly limited in the notch on the surface of the jaw (2), the top of the connecting rod (102) being connected with the slide rod (5), and the bottom of the connecting rod (102) being provided with a square platform (103), the end of the square platform (103) away from the inner wall of the jaw (2) being connected with the induction block (8).

9. An electrical meter box internal fault detection apparatus as claimed in claim 8, wherein: The contact plate (101) is made of metal, and a thin rod made of metal is mounted on the surface of the contact plate (101), the side end of the square platform (103) being protruded on the surface of the thin rod for limited sliding, and a spring being mounted in the square platform (103), the other end of the spring being in contact with the contact plate (101).

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