Power distribution cabinet voltage variable measurement and detection equipment

Abstract

The invention relates to the technical field of voltage detection, and particularly discloses a power distribution cabinet voltage variable measurement and detection device which comprises an auxiliary detection mechanism arranged on the outer side of a transient ground voltage sensor and used for enabling the detection end of the transient ground voltage sensor to be attached to a metal shell of a power distribution cabinet. The auxiliary detection mechanism is matched with the monitoring mechanism, the positions of the two ends of the bridge plate are judged, the bridge plate, the transient ground voltage sensor and the end of the outer shell are arranged in parallel, the bridge plate and the transient ground voltage sensor are arranged in parallel, the bridge plate and the transient ground voltage sensor are arranged in parallel, and the transient ground voltage sensor is arranged in the bridge plate. Therefore, the angle between the transient ground voltage sensor and the outer shell can be conveniently judged, so that the transient ground voltage sensor can be vertically attached to the metal shell of the power distribution cabinet, partial discharge signals in the power distribution cabinet can be more accurately captured, and the transient ground voltage detection accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage detection, and specifically to a measuring and detecting device for voltage variables of a distribution cabinet. Background Art

[0002] The distribution cabinet is an important part of the intelligent power distribution system, and its operating state is directly related to the safety and stability of the entire system. The transient ground voltage refers to the short-term ground voltage fluctuation generated in the distribution cabinet during the operation process due to internal faults or external interferences. Such fluctuations may cause damage to the equipment and even trigger more serious faults. Therefore, it is crucial to detect the transient ground voltage of the distribution cabinet.

[0003] The publication number CN118409150B discloses a continuous measuring device for electrical variables of a distribution cabinet. By setting an arc-shaped cover plate, when the continuous measuring device for electrical variables of the distribution cabinet is idle, it can cooperate with the protective box to completely cover the electrical variable test device body, thereby achieving a good protection effect and facilitating the test operation by the staff.

[0004] Combining the existing technologies, the following problems exist:

[0005] When detecting the transient ground voltage of the distribution cabinet, it is necessary to vertically attach the detector to the distribution cabinet to receive the electromagnetic wave signal to the maximum extent, so as to improve the sensitivity and accuracy of the detection. However, when detecting the transient ground voltage of the existing distribution cabinet, it is usually the staff who hold the detector to detect the distribution cabinet. The fitting effect between the detector and the distribution cabinet depends only on the experience of the staff, thus affecting the accuracy of detecting the transient ground voltage of the distribution cabinet. And before detecting the transient voltage of the distribution cabinet, it is necessary to detect the transient ground voltage under the air background where the distribution cabinet is located through a metal plate to judge whether the transient ground voltage of the distribution cabinet is abnormal by comparison. When detecting the transient ground voltage of the existing distribution cabinet, it is only the staff who hold the metal plate and the detector to fit for detection, reducing the detection accuracy, thus affecting the accuracy of detecting the transient ground voltage of the distribution cabinet. Referring to the above application document, it only detects the electrical variables by the staff holding the detector in the existing technology, which has certain deficiencies. To solve the above problems, a measuring and detecting device for voltage variables of a distribution cabinet is proposed. Summary of the Invention

[0006] In order to overcome the above deficiencies of the existing technologies, the present invention provides a measuring and detecting device for voltage variables of a distribution cabinet, which is convenient to assist the staff to vertically attach the detector to the distribution cabinet to receive the electromagnetic wave signal to the maximum extent, so as to improve the sensitivity and accuracy of the detection, and is convenient to attach the metal plate and the detector for detection, thus improving the accuracy of detecting the transient ground voltage of the distribution cabinet.

[0007] To achieve the above object, the present invention is realized through the following technical solutions: A voltage variable measurement and detection device for a power distribution cabinet, including a detector, the detector includes a housing, a transient ground voltage sensor provided at the end of the housing for transient ground voltage detection of the power distribution cabinet, and operation grooves opened on both sides of the housing. It further includes an auxiliary detection mechanism provided outside the transient ground voltage sensor for making the detection end of the transient ground voltage sensor fit with the metal housing of the power distribution cabinet. The auxiliary detection mechanism includes:

[0008] A bridge plate, sleeved outside the transient ground voltage sensor, and the middle end of the bridge plate is hinged to the end of the housing. An installation through groove for sleeving the transient ground voltage sensor is opened at the center of the bridge plate, and a space for the bridge plate to rotate is reserved on the inner wall of the installation through groove. The transient ground voltage sensor extends along the installation through groove to the side of the bridge plate away from the housing. Vacuum suction cups are fixedly provided at both outer ends of the bridge plate, and the vacuum suction cups are located on the side of the transient ground voltage sensor away from the housing. The bridge plate, the transient ground voltage sensor, and the end of the housing are arranged in parallel. Monitoring mechanisms are provided at both ends of the side of the bridge plate close to the housing. The monitoring mechanisms include:

[0009] A universal ball seat, embedded in the end of the side of the bridge plate close to the housing, and a ball head extending outside the universal ball seat is sleeved inside the universal ball seat.

[0010] Furthermore, the monitoring mechanism further includes:

[0011] A limit seat, fixedly provided at the end of the housing. A limit groove is opened on the side of the limit seat away from the housing. A limit plate and a limit rod are sleeved on the inner wall of the limit groove. The limit rod and the limit plate are fixedly connected to each other on the side close to each other. The side of the limit rod away from the limit plate is fixedly connected to the side of the ball head outside the universal ball seat to limit the rotation of the bridge plate;

[0012] A pressure sensor, fixedly provided on the inner wall of the limit groove, and the central axis of the pressure sensor and the central axis of the limit plate are on the same horizontal straight line. After the vacuum suction cup fits with the metal shell of the power distribution cabinet, the stress degree at both ends of the bridge plate is judged to judge the positions of both ends of the bridge plate. Identification mechanisms for mastering the positions of both ends of the bridge plate are provided at both ends of the bridge plate.

[0013] Furthermore, the monitoring mechanism further includes:

[0014] An elastic rubber block, sleeved on the inner wall of the limit groove and located between the pressure sensor and the limit plate;

[0015] A collar, fixedly sleeved on the inner wall of the limit groove, and the inner wall of the collar is sleeved on the outside of the elastic rubber block to limit the space for the limit plate to move in the limit groove and limit the deformation degree of the elastic rubber block.

[0016] Further, the side wall diameter of the limiting plate is greater than the side wall diameter of the limiting rod, so that the limiting plate and the limiting groove are in a stop fit, thereby restricting the separation of the limiting rod from the limiting groove;

[0017] A space for the movement of the limiting plate and the limiting rod is left on the inner wall of the limiting groove and on the side of the collar close to the limiting plate.

[0018] Further, the marking mechanism includes:

[0019] A hinged frame, fixedly arranged at the end of the bridge plate;

[0020] Connecting plates, movably arranged on both sides of the outer housing. A connecting block is fixedly arranged on the side of the connecting plate close to the hinged frame. The connecting block is located inside the hinged frame and is hinged to the hinged frame. A sliding groove is formed on the side of the connecting plate away from the outer housing. A first limiting mechanism is arranged on the inner wall of the sliding groove. A limiting component is arranged at one end of the first limiting mechanism close to the transient ground voltage sensor. Second limiting mechanisms arranged symmetrically with respect to the center point of the outer housing are arranged at the end of the outer housing. The first limiting mechanism, the limiting component and the second limiting mechanism cooperate to limit the metal plate.

[0021] Further, the marking mechanism further includes:

[0022] A first marking plate, fixedly arranged at the top of one side of the connecting plate located in the operation groove. A moving through groove communicating with the operation groove and used for sleeving the first marking plate is formed at the top of the outer housing. A first marking block is fixedly arranged at the top of the first marking plate;

[0023] A scale plate, fixedly arranged at the top of the outer housing, and the first marking block points to the scale plate.

[0024] Further, the first limiting mechanism includes:

[0025] A sliding plate, sleeved in the sliding groove. A second marking plate is fixedly arranged at the top of one side of the sliding plate located outside the sliding groove. A second marking block pointing to the scale plate is fixedly arranged at the top of the second marking plate;

[0026] A moving groove is formed on the side wall of the outer housing and communicates with the operation groove. The second marking plate is sleeved in the moving groove. A baffle for limiting the second marking plate is fixedly arranged on the side wall of the outer housing and outside the moving groove.

[0027] Further, the first limiting mechanism further includes:

[0028] A support groove is formed on one side of the sliding plate located in the sliding groove;

[0029] A support plate, fixedly arranged on the inner wall of the sliding groove and extending into the support groove. A spring is fixedly arranged on the side of the support plate away from the limiting component, and one end of the spring away from the support plate is fixedly connected to the inner wall of the support groove;

[0030] The identification mechanism further includes:

[0031] A first installation groove is formed in the side wall of the outer housing. A second installation groove is formed in the inner wall of the first installation groove. Both the first installation groove and the second installation groove communicate with the operation groove. The connecting plate is sleeved in the first installation groove, and the side of the sliding plate outside the sliding groove is sleeved in the second installation groove.

[0032] Furthermore, the limiting component includes:

[0033] A fixing plate is fixedly arranged at one end of the sliding plate close to the transient earth voltage sensor and is designed in an arc shape. Fixing blocks are fixedly arranged at both ends of the fixing plate.

[0034] The second limiting mechanism includes:

[0035] Fixing rods are fixedly arranged at intervals at the end of the outer housing. A rubber seat is fixedly arranged at the end of the fixing rod away from the outer housing.

[0036] A rotating hole is formed in the side wall of the bridge plate and is sleeved on the side wall of one of the fixing rods. The inner diameter of the inner wall of the rotating hole is larger than the side wall diameter of the fixing rod.

[0037] Furthermore, the auxiliary detection mechanism further includes:

[0038] Abnormal-shaped rods are fixedly arranged at the top and bottom of the bridge plate and are located at the central axis of the bridge plate.

[0039] Hinge seats are fixedly arranged at the upper end and the lower end of one side of the outer housing close to the bridge plate. The ends of the abnormal-shaped rods away from the bridge plate are rotatably connected to the hinge seats.

[0040] The present invention provides a power distribution cabinet voltage variable measurement and detection device. Compared with the prior art, it has the following beneficial effects:

[0041] 1. The auxiliary detection mechanism of the present invention cooperates with the monitoring mechanism to judge the positions of both ends of the bridge plate. Since the bridge plate, the transient earth voltage sensor and the end of the outer housing are arranged in parallel, it is convenient to judge the angle between the transient earth voltage sensor and the outer housing, so that the transient earth voltage sensor can be vertically attached to the metal housing of the power distribution cabinet, thereby being able to more accurately capture the partial discharge signal inside the power distribution cabinet and improving the accuracy of transient earth voltage detection.

[0042] 2. The present invention cooperates the monitoring mechanism and the identification mechanism, which is convenient to judge the stress degree of both ends of the bridge plate while facilitating the mastery of the positions of both ends of the bridge plate, thereby further improving the accuracy of the transient earth voltage sensor vertically attaching to the metal housing of the power distribution cabinet to improve the accuracy of transient earth voltage detection, and does not affect the subsequent use of transient earth voltage detection on the metal plate in the air background.

[0043] 3. The present invention restricts the rotation angle of the bridge plate through the limiting plate and the limiting rod, avoiding excessive rotation angle of the bridge plate, which affects the efficiency of making the bridge plate parallel to the transient earth voltage sensor. The elastic rubber block continuously monitors the deflection degree of the bridge plate, and the elastic rubber block is restricted by the collar, so that the elastic rubber block can only move closer to the pressure sensor after being squeezed, enabling the pressure sensor to better detect the change of force, thus facilitating the grasp of the position change at both ends of the bridge plate.

[0044] 4. The present invention makes the metal plate fit on the detection end of the transient earth voltage sensor through the first limiting mechanism, the second limiting mechanism and the limiting component, and grasps the positions of the sliding plates on both sides of the outer shell through the scale plate, so that the limiting positions of the limiting components and the second limiting mechanism on both sides of the end of the outer shell for the metal plate are the same, thus facilitating the fitting of the metal plate with the detection end of the transient earth voltage sensor to improve the accuracy of transient earth voltage detection in the air background;

[0045] During the process of the metal plate approaching the transient earth voltage sensor, both ends of the bridge plate deflect, and the monitoring mechanism and the auxiliary detection mechanism assist the staff to judge the fitting effect between the metal plate and the detection end of the transient earth voltage sensor, thereby further improving the accuracy of transient earth voltage detection in the air background.

[0046] 5. The present invention conducts transient earth voltage detection in the air background by making the metal plate approach the transient earth voltage sensor, and conducts transient earth voltage detection on the metal shell of the power distribution cabinet by making the transient earth voltage sensor approach the metal shell of the power distribution cabinet, so as to facilitate judging whether the transient earth voltage of the power distribution cabinet is abnormal by comparing the detection data, and to facilitate grasping potential faults of the power distribution cabinet, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is the overall structural schematic diagram of the present invention;

[0048] Figure 2 is the side view structural schematic diagram of the detector of the present invention;

[0049] Figure 3 is the structural schematic diagram of the auxiliary detection mechanism of the present invention;

[0050] Figure 4 is the structural schematic diagram of the auxiliary detection mechanism and the monitoring mechanism of the present invention;

[0051] Figure 5 is the horizontal sectional structural schematic diagram of the universal ball seat and the limiting seat of the present invention;

[0052] Figure 6 is the horizontal sectional structural schematic diagram of the limiting seat and the collar of the present invention;

[0053] Figure 7 Schematic structural diagram of the identification mechanism of the present invention;

[0054] Figure 8 Schematic exploded structural diagram of the hinge frame and connecting plate of the present invention;

[0055] Figure 9 Schematic structural diagram of the limit component, first limit mechanism, connecting plate and scale plate of the present invention;

[0056] Figure 10 Schematic structural diagram of the connecting plate and sliding plate of the present invention;

[0057] Figure 11 Schematic horizontal sectional structural diagram of the connecting plate and sliding plate of the present invention;

[0058] Figure 12 Schematic structural diagram of the hinge frame, sliding plate, connecting plate and chute of the present invention;

[0059] Figure 13 Schematic structural diagram of the support groove, sliding plate and connecting plate of the present invention;

[0060] Figure 14 Schematic structural diagram of the second limit mechanism and limit component of the present invention;

[0061] Figure 15 Schematic structural diagram of the first installation groove, second installation groove, operation groove, moving through groove, moving groove and baffle of the present invention.

[0062] Reference numerals involved in the above-mentioned drawings: 1, detector; 2, auxiliary detection mechanism; 3, monitoring mechanism; 4, identification mechanism; 5, first limit mechanism; 6, limit component; 7, vacuum suction cup; 8, second limit mechanism;

[0063] 11, outer housing; 12, transient earth voltage sensor; 13, operation groove;

[0064] 21, hinge seat; 22, bridge plate; 23, installation through groove; 24, special-shaped rod;

[0065] 31, universal ball seat; 32, limit groove; 33, limit seat; 34, collar; 35, limit plate; 36, limit rod; 37, ball head; 38, pressure sensor; 39, elastic rubber block;

[0066] 41, connecting plate; 42, connecting block; 43, hinge frame; 44, first identification plate; 45, moving through groove; 46, first identification block; 47, scale plate; 48, chute; 49, second installation groove; 491, first installation groove;

[0067] 51. Skateboard; 52. Second identification board; 53. Baffle; 54. Second identification block; 55. Support groove; 56. Support plate; 57. Moving groove;

[0068] 61. Fixed plate; 62. Fixed block;

[0069] 81. Rubber seat; 82. Rotation hole; 83. Fixed rod. Detailed implementation mode

[0070] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0071] Embodiment 1: Please refer to Figure 1 and Figure 2 , a power distribution cabinet voltage variable measurement and detection device, including a detector 1. The detector 1 includes a housing 11, a transient ground voltage sensor 12 provided at the end of the housing 11 for transient ground voltage detection of the power distribution cabinet, and operation grooves 13 opened on both sides of the housing 11. It further includes an auxiliary detection mechanism 2 provided outside the transient ground voltage sensor 12 for making the detection end of the transient ground voltage sensor 12 fit with the metal housing of the power distribution cabinet.

[0072] Please refer to Figure 3 and Figure 4 , the auxiliary detection mechanism 2 includes:

[0073] A bridge plate 22, sleeved outside the transient ground voltage sensor 12, and the middle end of the bridge plate 22 is hinged to the end of the housing 11. An installation through groove 23 for sleeving the transient ground voltage sensor 12 is opened at the center of the bridge plate 22, and a space for the bridge plate 22 to rotate is reserved on the inner wall of the installation through groove 23. The transient ground voltage sensor 12 extends along the installation through groove 23 to the side of the bridge plate 22 away from the housing 11. Vacuum suction cups 7 are fixedly provided at both outer ends of the bridge plate 22. The vacuum suction cups 7 are located on the side of the transient ground voltage sensor 12 away from the housing 11. The bridge plate 22, the transient ground voltage sensor 12 and the end of the housing 11 are arranged in parallel. Monitoring mechanisms 3 for monitoring the positions of both ends of the bridge plate 22 are provided at both ends of the side of the bridge plate 22 close to the housing 11. The monitoring mechanism 3 includes:

[0074] A universal ball seat 31, embedded in the end of the side of the bridge plate 22 close to the housing 11, and a ball head 37 extending outside the universal ball seat 31 is sleeved inside the universal ball seat 31.

[0075] The auxiliary detection mechanism 2 further includes:

[0076] The special-shaped rod 24 is fixedly arranged at the top and bottom of the bridge plate 22 and is located on the central axis of the bridge plate 22;

[0077] The hinge seats 21 are fixedly arranged at the upper end and the lower end of one side of the outer housing 11 close to the bridge plate 22, and the ends of the special-shaped rod 24 far from the bridge plate 22 are rotatably connected to the hinge seats 21.

[0078] In specific implementation, the hinge seats 21 and the special-shaped rod 24 for hinging the bridge plate 22 and the outer housing 11 are arranged at the central axis of the bridge plate 22, and the bridge plate 22 is of an integral structure, so that when one end of the bridge plate 22 deflects, the other end of the bridge plate 22 deflects correspondingly, and by cooperating with the monitoring mechanism 3, the positions of both ends of the bridge plate 22 are judged. And because the ends of the bridge plate 22, the transient earth voltage sensor 12 and the outer housing 11 are arranged in parallel, it is convenient to judge the angle between the transient earth voltage sensor 12 and the outer housing 11, so that the transient earth voltage sensor 12 can be vertically attached to the metal housing of the power distribution cabinet, and thus the partial discharge signal inside the power distribution cabinet can be captured more accurately to improve the accuracy of transient earth voltage detection;

[0079] During specific detection, the staff holds the outer housing 11 of the detector 1, makes the vacuum suction cup 7 close to the metal housing of the power distribution cabinet and squeezes it. During the process of the vacuum suction cup 7 being squeezed, the vacuum suction cup 7 shrinks. Since the transient earth voltage sensor 12 extends along the installation through groove 23 to the side of the bridge plate 22 far from the outer housing 11, and the vacuum suction cup 7 is located on the side of the transient earth voltage sensor 12 far from the outer housing 11, the detection end of the transient earth voltage sensor 12 is attached to the metal housing of the power distribution cabinet. At the same time, the stress levels on both sides of the bridge head are judged through the monitoring mechanism 3 until the values of the monitoring mechanism 3 at both ends of the bridge head are the same, and the value detected by the detector 1 is read as the comparison value to be compared with the detection vertical under the air background, so as to judge whether the transient earth voltage of the power distribution cabinet is abnormal, so as to master potential faults of the power distribution cabinet, etc.;

[0080] When the values of the monitoring mechanism 3 at both ends of the bridge plate 22 are the same, it indicates that the forces on both sides of the bridge plate 22 are the same. At this time, the ends of the bridge plate 22, the transient earth voltage sensor 12 and the outer housing 11 are parallel, thus assisting the staff to make the detection end of the transient earth voltage sensor 12 vertically attached to the metal housing of the power distribution cabinet, so as to be able to capture the partial discharge signal inside the power distribution cabinet more accurately, thereby improving the accuracy of transient earth voltage detection.

[0081] By arranging the installation through groove 23, no obstruction is generated between the bridge plate 22 and the transient earth voltage sensor 12 during the rotation of the bridge plate 22, avoiding affecting the actual use of transient earth voltage detection.

[0082] Please refer to Figure 4 、 Figure 5 and Figure 6, the monitoring mechanism 3 further includes:

[0083] A limit seat 33 is fixedly arranged at the end of the outer housing 11. A limit groove 32 is provided on the side of the limit seat 33 away from the outer housing 11. The inner wall of the limit groove 32 is sleeved with a limit plate 35 and a limit rod 36. The side of the limit rod 36 and the limit plate 35 close to each other are fixedly connected. The side of the limit rod 36 away from the limit plate 35 is fixedly connected to the side of the ball head 37 outside the universal ball seat 31 to limit the rotation of the bridge plate 22.

[0084] A pressure sensor 38 is fixedly arranged on the inner wall of the limit groove 32, and the central axis of the pressure sensor 38 and the central axis of the limit plate 35 are on the same horizontal straight line. After the vacuum suction cup 7 is attached to the metal shell of the power distribution cabinet, the force on both ends of the bridge plate 22 is judged to determine the positions of both ends of the bridge plate 22. Marking mechanisms 4 for grasping the positions of both ends of the bridge plate 22 are provided at both ends of the bridge plate 22.

[0085] The monitoring mechanism 3 further includes:

[0086] An elastic rubber block 39 is sleeved on the inner wall of the limit groove 32 and is located between the pressure sensor 38 and the limit plate 35.

[0087] A collar 34 is fixedly sleeved on the inner wall of the limit groove 32. The inner wall of the collar 34 is sleeved on the outside of the elastic rubber block 39 to limit the moving space of the limit plate 35 in the limit groove 32 and limit the deformation degree of the elastic rubber block 39.

[0088] In specific implementation, when the force on the end of the bridge plate 22 changes, the bridge plate 22 drives the universal ball seat 31 to rotate along the side wall of the ball head 37. During this process, the ball head 37 at one end of the bridge plate 22 drives the limit rod 36 and the limit plate 35 to squeeze the elastic rubber block 39 along the inner wall of the limit groove 32, so that the value of the pressure sensor 38 changes. At the same time, the ball head 37 at the other end of the bridge plate 22 drives the limit rod 36 and the limit plate 35 to rotate correspondingly, and the value of the pressure sensor 38 changes correspondingly, so as to facilitate grasping the force on both ends of the bridge plate 22 and thus facilitate grasping the positions of both ends of the bridge plate 22.

[0089] By allowing the limit plate 35 and the limit rod 36 to have a certain moving space in the limit groove 32, the rotation angle of the bridge plate 22 is restricted, avoiding the situation that the rotation angle of the bridge plate 22 is too large and affecting the efficiency of making the bridge plate 22 parallel to the transient earth voltage sensor 12. And when not in use, the space occupied by the bridge plate 22 due to deflection is reduced, which is convenient for actual carrying and use.

[0090] By arranging the elastic rubber block 39 between the pressure sensor 38 and the limit plate 35, it is convenient for the pressure sensor 38 to continuously monitor the degree of deflection of the bridge plate 22. And the elastic rubber block 39 is restricted by the collar 34, so that after being squeezed, the elastic rubber block 39 can only move closer to the pressure sensor 38, enabling the pressure sensor 38 to better detect the change of force, thus facilitating the grasp of the change of the positions at both ends of the bridge plate 22.

[0091] By arranging the bridge plate 22 and the like at the end of the outer housing 11, it occupies less space outside the detector 1, which is convenient for actual contact with the metal housing of the power distribution cabinet and reduces the subsequent adverse effects on carrying and the like.

[0092] The side wall diameter of the limit plate 35 is larger than the side wall diameter of the limit rod 36, so that the limit plate 35 is in a stop fit with the limit groove 32, thereby restricting the separation of the limit rod 36 from the limit groove 32;

[0093] A space for the movement of the limit plate 35 and the limit rod 36 is left on the inner wall of the limit groove 32 and on the side of the collar 34 close to the limit plate 35.

[0094] Please refer to Figure 7 、 Figure 8 、 Figure 9 and Figure 15 , the marking mechanism 4 includes:

[0095] The hinged frame 43 is fixedly arranged at the end of the bridge plate 22;

[0096] The connecting plate 41 is movably arranged on both sides of the outer housing 11. A connecting block 42 is fixedly arranged on the side of the connecting plate 41 close to the hinged frame 43. The connecting block 42 is located inside the hinged frame 43 and is hinged to the hinged frame 43. A sliding groove 48 is formed on the side of the connecting plate 41 far from the outer housing 11. A first limiting mechanism 5 is arranged on the inner wall of the sliding groove 48. A limiting component 6 is arranged at one end of the first limiting mechanism 5 close to the transient ground voltage sensor 12. The second limiting mechanism 8 arranged symmetrically with respect to the center point of the outer housing 11 is arranged at the end of the outer housing 11. The first limiting mechanism 5, the limiting component 6 and the second limiting mechanism 8 cooperate to limit the metal plate.

[0097] The marking mechanism 4 further includes:

[0098] The first marking plate 44 is fixedly arranged at the top of the side of the connecting plate 41 located in the operation groove 13. A moving through groove 45 communicating with the operation groove 13 and used for sleeving the first marking plate 44 is formed at the top of the outer housing 11. A first marking block 46 is fixedly arranged at the top of the first marking plate 44;

[0099] The scale plate 47 is fixedly arranged at the top of the outer housing 11, and the first marking block 46 points to the scale plate 47.

[0100] In specific implementation, when both ends of the bridge plate 22 deflect, the bridge plate 22 drives the connecting block 42 and the connecting plate 41 to displace in the second installation groove 49 through the hinge frame 43, thereby driving the first identification plate 44 to move along the operation groove 13 and the moving through groove 45, so as to drive the first identification block 46 to move. Thus, the position of the first identification block 46 pointing to the scale plate 47 is further used to judge the positions of both ends of the bridge plate 22.

[0101] Embodiment 2: Please refer to Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 and Figure 15 , the different technical solution of this embodiment compared with Embodiment 1 is that the first limiting mechanism 5 includes:

[0102] A sliding plate 51, sleeved in the sliding groove 48. A second identification plate 52 is fixedly arranged at the top of one side of the sliding plate 51 outside the sliding groove 48. A second identification block 54 pointing to the scale plate 47 is fixedly arranged at the top of the second identification plate 52;

[0103] A moving groove 57 is opened on the side wall of the outer housing 11 and communicated with the operation groove 13. The second identification plate 52 is sleeved in the moving groove 57. A baffle 53 for limiting the second identification plate 52 is fixedly arranged on the side wall of the outer housing 11 and outside the moving groove 57.

[0104] The first limiting mechanism 5 further includes:

[0105] A support groove 55 is opened on one side of the sliding plate 51 located in the sliding groove 48;

[0106] A support plate 56 is fixedly arranged on the inner wall of the sliding groove 48 and extends into the support groove 55. A spring is fixedly arranged on the side of the support plate 56 away from the limiting component 6, and one end of the spring away from the support plate 56 is fixedly connected with the inner wall of the support groove 55;

[0107] The identification mechanism 4 further includes:

[0108] A first installation groove 491 is opened on the side wall of the outer housing 11. A second installation groove 49 is opened on the inner wall of the first installation groove 491. Both the first installation groove 491 and the second installation groove 49 are communicated with the operation groove 13. The connecting plate 41 is sleeved in the first installation groove 491, and one side of the sliding plate 51 outside the sliding groove 48 is sleeved in the second installation groove 49.

[0109] Please refer to Figure 11 and Figure 14 , the limiting component 6 includes:

[0110] The fixing plate 61 is fixedly arranged at one end of the sliding plate 51 close to the transient earth voltage sensor 12, and is designed in an arc shape. Fixed blocks 62 are fixedly arranged at both ends of the fixing plate 61;

[0111] Please refer to Figure 14 , the second limiting mechanism 8 includes:

[0112] The fixed rod 83 is fixedly arranged at intervals at the end of the outer housing 11. A rubber seat 81 is fixedly arranged at one end of the fixed rod 83 away from the outer housing 11;

[0113] The rotating hole 82 is opened on the side wall of the bridge plate 22 and sleeved on the side wall of one of the fixed rods 83. The inner diameter of the inner wall of the rotating hole 82 is larger than the side wall diameter of the fixed rod 83.

[0114] In specific implementation, when performing transient earth voltage detection on a metal plate in an air background, the outer housing 11 is placed at the tiger's mouth of the staff's palm. Then, the sliding plate 51 is pushed along the sliding groove 48 by the thumb and index finger, so as to drive the fixing plate 61 and the fixed block 62 away from the transient earth voltage sensor 12, leaving a gap for placing the metal plate between the fixed block 62 and the rubber seat 81. Then, the metal plate is placed, and the sliding plate 51 is pulled in the reverse direction, so that the fixed block 62 presses the metal plate, so that the metal plate presses the rubber seat 81 and fits against the transient earth voltage sensor 12. During this process, the sliding plate 51 is continuously pulled, so that the metal plate fits against the detection end of the transient earth voltage sensor 12, and when the sliding plate 51 moves, it drives the second identification plate 52 to move along the moving through groove 45 and the operation groove 13, so as to drive the second identification block 54 to move, so as to master the positions of the sliding plates 51 on both sides of the outer housing 11 through the scale plate 47, so that the limiting components 6 and the second limiting mechanism 8 on both ends of the outer housing 11 limit the metal plate to the same position, so as to facilitate the fitting of the metal plate and the detection end of the transient earth voltage sensor 12, so as to improve the accuracy of transient earth voltage detection in an air background.

[0115] During the process of the metal plate approaching the transient earth voltage sensor 12, the metal plate presses the vacuum suction cup 7, so that both ends of the bridge plate 22 deflect, so as to, through the steps of the above-mentioned Embodiment 1, assist the staff to judge the fitting effect between the metal plate and the detection end of the transient earth voltage sensor 12 through the monitoring mechanism 3, so as to further improve the accuracy of transient earth voltage detection in an air background.

[0116] By moving the sliding plate 51 in the sliding groove 48 on the side wall of the connecting plate 41, it does not affect the identification of the positions of both ends of the bridge plate 22 by the identification mechanism 4, and does not affect the driving of the first limiting mechanism 5 to drive the limiting component 6 to move, which is convenient for actual use. By setting the spring, the support plate 56 and the support groove 55, when the transient earth voltage detection is not performed on the metal plate, the limiting component 6 approaches the bridge plate 22, which does not affect the transient earth voltage detection of the metal shell of the power distribution cabinet.

[0117] When the present invention is implemented, when the staff enters the power distribution cabinet machine room and conducts a transient ground voltage detection on the power distribution cabinet, it is necessary to first conduct a transient ground voltage detection in the power distribution cabinet machine room under an air background. During this process, the staff places the pre-prepared metal plate at the detection end of the transient ground voltage sensor 12, and uses the first limiting mechanism 5, the second limiting mechanism 8 and the limiting component 6 to cooperate to limit the metal plate, so that the metal plate fits with the detection end of the transient ground voltage sensor 12, so as to conduct a transient ground voltage detection under an air background. By conducting a transient ground voltage detection under an air background now, it has the advantages of calibrating the detection equipment, verifying the reliability of the detection method and eliminating external interference, etc., so as to improve the accuracy of the transient ground voltage detection of the power distribution cabinet. When conducting a transient ground voltage detection under an air background through the metal plate;

[0118] Among them, the selection of the metal plate detection position usually selects at least 3 detection points on the upper, middle and lower parts of the metal plate, and takes the median value to ensure the accuracy of the detection.

[0119] After finishing under an air background, remove the metal plate and reset the first limiting mechanism 5. Immediately afterwards, the staff holds the detector 1 close to the metal shell of the power distribution cabinet, and through the cooperation of the auxiliary detection mechanism 2, the marking mechanism 4 and the monitoring mechanism 3, the detection end of the transient ground voltage sensor 12 is made to fit with the metal shell of the power distribution cabinet, avoiding the traditional method of only judging the fitting degree between the detection end of the transient ground voltage sensor 12 and the metal shell of the power distribution cabinet by the experience of the staff, so as to reduce the error and thus improve the accuracy of the detection. After the detection is completed, judge whether the transient ground voltage of the power distribution cabinet is abnormal by the difference between the detection under an air background environment and the detection under the metal shell of the power distribution cabinet;

[0120] Among them, the selection of the power distribution cabinet detection position usually selects at least five detection points in the middle and lower parts of the front panel of the power distribution cabinet, and the upper, middle and lower parts of the rear panel, so as to ensure the accuracy of the transient ground voltage detection of the power distribution cabinet. For the power distribution cabinet located on the outermost side, three detection points on the upper, middle and lower sides of the side also need to be selected.

[0121] At the same time, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0122] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or apparatus.

[0123] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A voltage variable measurement and detection device for a power distribution cabinet, comprising a detector. The detector includes a housing, a transient ground voltage sensor disposed at the end of the housing for transient ground voltage detection of the power distribution cabinet, and operation grooves opened on both sides of the housing. It is characterized in that, It further includes an auxiliary detection mechanism arranged outside the transient ground voltage sensor for making the detection end of the transient ground voltage sensor fit with the metal shell of the power distribution cabinet. The auxiliary detection mechanism includes: A bridge plate sleeved outside the transient ground voltage sensor, with the middle end of the bridge plate hinged to the end of the outer shell. An installation through groove for sleeving the transient ground voltage sensor is provided at the center of the bridge plate, and a space for the bridge plate to rotate is reserved on the inner wall of the installation through groove. The transient ground voltage sensor extends along the installation through groove to the side of the bridge plate away from the outer shell. Vacuum suckers are fixedly arranged at both outer ends of the bridge plate, and the vacuum suckers are located on the side of the transient ground voltage sensor away from the outer shell. The bridge plate, the transient ground voltage sensor, and the end of the outer shell are arranged in parallel. Monitoring mechanisms for monitoring the positions of both ends of the bridge plate are arranged at both ends of the side of the bridge plate close to the outer shell. The monitoring mechanism includes: A universal ball seat embedded in the end of the side of the bridge plate close to the outer shell, and a ball head extending outside the universal ball seat is sleeved inside the universal ball seat.

2. The voltage variable measurement and detection device for a power distribution cabinet according to claim 1, wherein The monitoring mechanism further includes: A limit seat fixedly arranged at the end of the outer shell. A limit groove is provided on the side of the limit seat away from the outer shell. A limit plate and a limit rod are sleeved on the inner wall of the limit groove. The limit rod and the limit plate are fixedly connected to each other on the side close to each other, and the side of the limit rod away from the limit plate is fixedly connected to the side of the ball head outside the universal ball seat to limit the rotation of the bridge plate. A pressure sensor fixedly arranged on the inner wall of the limit groove, and the central axis of the pressure sensor and the central axis of the limit plate are on the same horizontal straight line. After the vacuum sucker fits with the metal shell of the power distribution cabinet, the force on both ends of the bridge plate is judged to judge the positions of both ends of the bridge plate. Identification mechanisms for mastering the positions of both ends of the bridge plate are arranged at both ends of the bridge plate.

3. The voltage variable measurement and detection device for a power distribution cabinet according to claim 2, characterized in that, The monitoring mechanism further includes: An elastic rubber block sleeved on the inner wall of the limit groove and located between the pressure sensor and the limit plate. A collar fixedly sleeved on the inner wall of the limit groove, and the inner wall of the collar is sleeved on the outside of the elastic rubber block to limit the space for the limit plate to move in the limit groove and limit the deformation degree of the elastic rubber block.

4. The voltage variable measurement and detection device for a power distribution cabinet according to claim 3, characterized in that, The side wall diameter of the limit plate is larger than the side wall diameter of the limit rod, so that the limit plate is in a stop fit with the limit groove, thereby restricting the limit rod from separating from the limit groove. A space for the limit plate and the limit rod to move is reserved on the inner wall of the limit groove and on the side of the collar close to the limit plate.

5. The voltage variable measurement and detection device for a power distribution cabinet according to claim 2, wherein, The identification mechanism includes: A hinged frame fixedly arranged at the end of the bridge plate. A connecting plate movably arranged on both sides of the outer shell. A connecting block is fixedly arranged on the side of the connecting plate close to the hinged frame. The connecting block is located inside the hinged frame and is hinged to the hinged frame. A sliding groove is provided on the side of the connecting plate away from the outer shell. A first limiting mechanism is arranged on the inner wall of the sliding groove. A limiting component is arranged at one end of the first limiting mechanism close to the transient ground voltage sensor. A second limiting mechanism symmetrically arranged with the center point of the outer shell is arranged at the end of the outer shell. The first limiting mechanism, the limiting component, and the second limiting mechanism cooperate to limit the metal plate.

6. The voltage variable measurement and detection device for a power distribution cabinet according to claim 5, wherein The identification mechanism further includes: The first identification plate is fixedly arranged at the top of one side of the connecting plate located in the operation groove. A moving through groove communicating with the operation groove and used for sleeving the first identification plate is opened at the top of the outer shell body. A first identification block is fixedly arranged at the top of the first identification plate. The scale plate is fixedly arranged at the top of the outer shell body, and the first identification block points to the scale plate.

7. The voltage variable measurement and detection device for a power distribution cabinet according to claim 6, characterized in that, The first limiting mechanism includes: The sliding plate is sleeved in the sliding groove. A second identification plate is fixedly arranged at the top of one side of the sliding plate located outside the sliding groove. A second identification block pointing to the scale plate is fixedly arranged at the top of the second identification plate. The moving groove is opened on the side wall of the outer shell body and communicates with the operation groove. The second identification plate is sleeved in the moving groove. A baffle for limiting the second identification plate is fixedly arranged on the side wall of the outer shell body and outside the moving groove.

8. A voltage variable measurement and detection device for a power distribution cabinet according to claim 7, characterized in that The first limiting mechanism further includes: The support groove is opened on one side of the sliding plate located in the sliding groove. The support plate is fixedly arranged on the inner wall of the sliding groove and extends into the support groove. A spring is fixedly arranged on one side of the support plate away from the limiting component, and one end of the spring away from the support plate is fixedly connected with the inner wall of the support groove. The identification mechanism further includes: The first installation groove is opened on the side wall of the outer shell body. The inner wall of the first installation groove is provided with a second installation groove. Both the first installation groove and the second installation groove communicate with the operation groove. The connecting plate is sleeved in the first installation groove, and one side of the sliding plate located outside the sliding groove is sleeved in the second installation groove.

9. The voltage variable measurement and detection device for a power distribution cabinet according to claim 7, characterized in that, The limiting component includes: The fixing plate is fixedly arranged at the end of one side of the sliding plate close to the transient ground voltage sensor and is designed in an arc shape. Fixing blocks are fixedly arranged at both ends of the fixing plate. The second limiting mechanism includes: The fixing rods are fixedly arranged at intervals at the end of the outer shell body. A rubber seat is fixedly arranged at one end of the fixing rod away from the outer shell body. The rotating hole is opened on the side wall of the bridge plate and is sleeved on the side wall of one of the fixing rods. The inner diameter of the inner wall of the rotating hole is larger than the side wall diameter of the fixing rod.

10. A voltage variable measurement and detection device for a power distribution cabinet according to claim 1, characterized in that, The auxiliary detection mechanism further includes: The special-shaped rods are fixedly arranged at the top and bottom of the bridge plate and are located at the central axis of the bridge plate. The hinge seats are fixedly arranged at the upper end and the lower end of one side of the outer shell body close to the bridge plate. One end of the special-shaped rod away from the bridge plate is rotatably connected with the hinge seat.

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