A high-safety power equipment live detection device

Abstract

This invention provides a high-safety live-line testing device for power equipment, belonging to the technical field of live-line testing equipment. The invention includes a testing box, a testing meter, and the cable under test. The testing box consists of an upper box and a lower box, and further includes: a flipping assembly; and a section testing assembly. Through the cooperation of a half-shaft sleeve, a testing kit, and a flexible ring, a geometrically fixed testing section is temporarily constructed on the cable, eliminating signal interference caused by macroscopic cable sway and laying the foundation for quantitative testing. An integrated cleaning and collection system and a near-field testing chamber actively remove and isolate contaminants, significantly improving the signal-to-noise ratio and signal fidelity. Combining axial movement and circumferential rotation scanning, it achieves full-coverage detection of the cable surface, significantly improving defect detection rate and positioning accuracy. The split-type box and automatic flipping mechanism allow for remote operation without personnel contacting the cable, fundamentally ensuring safety and supporting rapid online installation, greatly improving inspection efficiency.

Description

Technical Field

[0001] This invention relates to the field of live-line testing equipment technology, and more specifically, to a high-safety live-line testing device for power equipment. Background Technology

[0002] Power equipment testing devices are instruments used to test, verify, inspect, and accept equipment for power production and power grid operation. They provide reliable assurance for the safety and reliability of power operation. When a circuit grid fails, people use power equipment testing devices to conduct on-site inspections to ensure the normal operation of the power grid.

[0003] Existing live-line testing devices mostly use sealed enclosures for testing. While this physically isolates them from external interference such as wind, rain, and strong light, it neglects the impact of the testing operation itself on the microenvironment inside the enclosure. The cable insulation surface is often covered with dust, salt deposits, metal dust, and other contaminants accumulated during operation. When the testing head moves along the cable to scan, these contaminants are scraped and agitated, escaping and flying in the limited enclosed space. This not only contaminates the optical surface of the testing sensors (such as infrared lenses and ultraviolet windows), leading to signal attenuation or misreading, but may also induce partial discharge in a high electric field environment, generating severe background noise. This drowns out the real equipment defect signal, significantly reducing the signal-to-noise ratio and accuracy of the test. In addition, existing devices mostly use fixed ring array sensors or a limited number of detection points. This static detection mode has an inherent detection blind zone, especially for highly directional signals (such as partial discharge at a specific angle or overheating at the back). More importantly, due to the assembly gap between the device and the cable, and the fact that the cable is not an ideal straight line under its own weight and wind sway, the relative spatial position of the detection head and the cable is unstable and uncontrollable in the actual detection process. This "gap fluctuation" in non-contact detection will directly cause drastic fluctuations in the detection intensity of signals such as electric field and ultrasonic waves. It may misjudge normal position changes as abnormal equipment status, or make weak real defect signals unable to be captured due to increased distance.

[0004] How to invent a highly secure live-line detection device for electrical equipment to solve these problems has become an urgent issue for those skilled in the art. Summary of the Invention

[0005] To overcome the above deficiencies, the present invention provides a high-safety live-line detection device for electrical equipment, which aims to solve the problems mentioned in the background.

[0006] This invention is implemented as follows: This invention provides a high-safety live-line testing device for electrical equipment, comprising a testing box, a testing meter, and a cable to be tested. The testing box consists of an upper box and a lower box, and further includes: A flipping component is located at the rear of the detection box and is used to control the opening and closing state of the detection box. An interval detection component is installed inside the detection box and can detect the cable to be tested within a closed interval.

[0007] Preferably, a hinge one is fixedly connected to the upper housing, and a hinge two is fixedly connected to the lower housing. The hinge one and hinge two are matched and configured. A connecting rod is fixedly connected to the hinge two, and the connecting rod is rotatably connected to the hinge two.

[0008] Preferably, the flipping assembly includes a connecting plate fixedly connected to the bottom of the upper housing and a telescopic rod fixedly connected to the connecting plate. A rack is fixedly connected to the output end of the telescopic rod, and a guide rail is fixedly connected to the top of the telescopic rod. The rack and the guide rail are slidably connected. A gear is fixedly connected to the end of the connecting rod corresponding to the rack, and the gear meshes with the rack.

[0009] Preferably, the telescopic rod is a pneumatic push rod or an electric push rod.

[0010] Preferably, the interval detection assembly includes a half-shaft sleeve, a motor, a detection kit, a lead screw, and two arc-shaped plates; the detection kit consists of an upper detection element and a lower detection element, which form a complete cylindrical structure after docking; the motor is fixed inside the lower housing, and a second gear is fixedly connected to the output end of the motor; one end of the lead screw passes through the side wall of the lower housing and a third gear is fixedly connected to its end; the second gear and the third gear are meshed; a housing is fitted around the outer sides of the second gear and the third gear; the lead screw is rotatably connected to the corresponding half-shaft sleeve, and the lead screw is connected to the upper detection element by a helical transmission.

[0011] Preferably, the test gauge is fixedly installed inside the upper housing by a mounting bolt. The upper and lower housings are provided with corresponding notches, which are semi-circular in shape, and a half-shaft sleeve is fixedly connected in the corresponding notch. The inner diameter of the half-shaft sleeve matches the outer diameter of the cable to be tested.

[0012] Preferably, the helical drive is a threaded drive, and the upper detection element is provided with a threaded hole or nut structure that mates with the thread of the lead screw; a limit rod is fixedly connected between the two half-shaft sleeves located on the lower housing, and the upper detection element is slidably sleeved on the limit rod; a limit rod and a guide rod are fixedly connected between the two half-shaft sleeves located on the upper housing, and the lower detection element is slidably sleeved on the limit rod and the guide rod.

[0013] Preferably, both ends of the upper and lower detection elements are fixedly connected to flexible rings, the arc-shaped plate is disposed between the two flexible rings, the inner side of the arc-shaped plate is provided with a plurality of detection sensors, the outer side wall of the arc-shaped plate is fixedly connected to a connecting ring, and the upper and lower detection elements are provided with receiving cavities for the connecting ring to pass through; the lower detection element is also provided with a plurality of ball grooves, and the upper detection element corresponding to the ball grooves is fixedly connected with a plurality of balls that match the ball grooves.

[0014] Preferably, the upper detection element is further provided with a mounting groove, which is connected to the receiving cavity. A motor is fixedly installed in the mounting groove, and a friction wheel is fixedly connected to the output end of the motor. The position of the friction wheel corresponds to the position of the connecting ring, and the outer side wall of the friction wheel is in close contact with the outer side of the connecting ring. There is a gap between the detection sensor and the outer surface of the cable under test. The flexible ring is in close contact with the outer surface of the cable under test. A signal transmitter is provided on the outer side wall of one of the arc-shaped plates. A receiver is fixedly connected inside the receiving cavity on the lower detection element. The positions of the signal transmitter and the receiver correspond. The signal transmitter, the receiver, and the motor are electrically connected. An insulating shielding mesh is provided on the inner side of the arc-shaped plate. A signal reflection coating is applied to the inner side of the insulating shielding mesh. The arc-shaped plate, the detection sensor, and the detection meter are electrically connected.

[0015] Preferably, a baffle is fixedly connected to the port of the lower detection element, and a guide cavity is formed between the inner side of the baffle and the corresponding flexible ring. A slot is opened in the lower detection element corresponding to the guide cavity, and the end of the slot penetrates the side wall of the lower detection element. A collection box is also fixedly connected to the outer side of the lower detection element. The upper side of the collection box is open, and the outer sides of the baffle and the collection box are flush with the port of the lower detection element.

[0016] The beneficial effects of this invention are: 1. The device defines two radial constraint points with fixed spacing on the cable by using four half-shaft sleeves to locally lock a section of the cable. Then, the detection kit tightly wraps around this section of cable, and the flexible rings at both ends make elastic sealing contact with the cable surface. The cooperation of these three components temporarily creates a detection section with fixed length and controlled spatial orientation on the cable. The relative distance and angle between the detection sensor and the cable surface in this section are determined only by the internal mechanical dimensions of the detection kit (such as the installation radius of the arc plate and the thickness of the flexible ring), eliminating the interference of "spacing fluctuation" caused by long-range macroscopic movements such as cable sag and wind sway. This allows the fluctuation of the detection signal to truly reflect the changes in the local state of the cable, laying the physical foundation for high-precision and repeatable quantitative detection.

[0017] 2. At the port of the detection kit, the flexible ring scrapes away dirt from the cable surface as it moves axially. The baffle, guide cavity, trough, and collection box constitute a directional guidance and closed collection system, which discharges and seals the dirt to prevent it from being dispersed again inside the box. At the same time, the "near-field detection cavity" formed by the detection kit cylinder wall and the flexible rings at both ends isolates the core sensing area from the external box space. On the one hand, this greatly reduces the contamination of the optical sensor window by suspended particles and the random discharge noise induced by dirt, ensuring the original fidelity and high signal-to-noise ratio of the signal. On the other hand, the stable "near-field detection cavity" optimizes the electromagnetic and acoustic environment. Combined with the insulating shielding mesh and signal reflection coating on the inner side of the arc plate, it further shields external interference and enhances the collection efficiency of useful signals, improving the sensitivity and reliability of the detection from a hardware perspective.

[0018] 3. The axial movement scanning of the detection kit, plus the circumferential scanning of the arc plate and the sensor array on it around the cable axis, forms a two-dimensional gridded scanning path. This overcomes the detection blind spots of fixed sensor arrays and realizes the detection of designated cylindrical areas on the cable surface without dead angles. It can not only more effectively detect directional defects (such as partial discharge), but also cross-verify and stereoscopically image suspected points through multi-angle data, which significantly improves the defect detection rate, identification accuracy and positioning accuracy.

[0019] 4. The split-type detection box, consisting of an upper and lower housing, combined with a flip-up component, enables the device to be automatically opened and closed remotely from the side of the cable. This design eliminates the risk of falls and electric shocks for operators, ensuring inherent safety. Furthermore, the design supports rapid installation and disassembly at any point on the overhead line, enabling the device to be used online and reusable, greatly improving the efficiency of inspection operations. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the flipping component structure of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the detection box of the present invention; Figure 4 This is the invention Figure 3 Enlarged structural diagram at point B; Figure 5 This is a schematic diagram of the detection box of the present invention when it is opened; Figure 6 This is the invention Figure 5 Enlarged structural diagram at point A in the middle; Figure 7 This is a schematic diagram of the cross-sectional structure of the testing box and the cable under test of the present invention; Figure 8 This is the invention Figure 7 Enlarged structural diagram at point C; Figure 9 This is a schematic diagram of the cross-sectional structure of the trough of the present invention; Figure 10 This is a schematic diagram of the detection kit of the present invention in operation; Figure 11 This is a schematic diagram of the detection kit structure of the present invention; Figure 12 This is a schematic cross-sectional view of the detection kit of the present invention.

[0022] In the diagram: 1. Detection box; 2. Connecting plate; 3. Hinge 1; 4. Detection gauge; 5. Half-shaft sleeve; 6. Detection kit; 7. Arc plate; 8. Collection box; 9. Motor; 10. Cable under test; 11. Upper box; 12. Lower box; 21. Telescopic rod; 22. Rack; 23. Gear 1; 31. Hinge 2; 32. Connecting rod; 41. Mounting bolt; 61. Upper detection element; 62. Lower detection element; 63. Flexible ring; 64. Ball groove; 65. Motor; 66. Friction wheel; 71. Detection sensor; 72. Connecting ring; 73. Receiving cavity; 81. Baffle; 82. Guide cavity; 91. Gear 2; 92. Gear 3; 93. Housing; 94. Lead screw; 95. Limiting rod; 96. Guide rod; 221. Guide rail; 721. Signal transmitter; 731. Receiver; 821. Leakage groove. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0024] Example 1, refer to Figures 1-12A high-safety live-line testing device for power equipment includes a testing box 1, a testing meter 4, and a cable 10 to be tested. The testing box 1 consists of an upper box 11 and a lower box 12. The testing box 1 adopts a split box structure (upper box 11 and lower box 12), allowing the device to hug the cable from the side without needing to slip it onto the cable end. This greatly facilitates installation and testing at any point on a continuous overhead line, enabling online installation and reusability of the device, avoiding damage to the cable or permanent installation. It is suitable for inspection operations. The enclosed space formed by the box isolates the external environment (such as wind, rain, strong light, and electromagnetic interference), creating a stable environment for precise internal testing. It also includes: A flipping component is located at the rear of the detection box 1 and is used to control the opening and closing state of the detection box 1. The interval detection component is located inside the detection box 1 and can detect the cable 10 to be tested within a closed interval.

[0025] Furthermore, a hinge 3 is fixedly connected to the upper housing 11, and a hinge 31 is fixedly connected to the lower housing 12. The hinge 3 and the hinge 31 are matched and set together. A connecting rod 32 is fixedly connected to the hinge 31, and the connecting rod 32 is rotatably connected to the hinge 31.

[0026] The flipping assembly includes a connecting plate 2 fixedly connected to the bottom of the upper housing 11 and a telescopic rod 21 fixedly connected to the connecting plate 2. A rack 22 is fixedly connected to the output end of the telescopic rod 21, and a guide rail 221 is fixedly connected to the top of the telescopic rod 21. The rack 22 and the guide rail 221 are slidably connected. The guide rail 221 ensures that the rack 22 moves smoothly in a straight line under huge thrust, preventing jamming or deflection and improving transmission reliability. A gear 23 is fixedly connected to the end of the connecting rod 32 corresponding to the rack 22. The gear 23 meshes with the rack 22. The linear motion output by the telescopic rod 21 is converted into the rotational motion of the connecting rod 32 and the upper housing 11 through the gear 23 and the rack 22. This transmission method has a larger torque output and more stable motion characteristics than the direct hinge push rod. In particular, it can smoothly control the housing when starting and stopping, avoiding impact on the cable or the device itself.

[0027] It should be noted that the telescopic rod 21 is a pneumatic or electric push rod, which has a large thrust, accurate stroke control, and is suitable for harsh outdoor environments. The flipping component enables the remote, stable, and controllable automatic opening and closing of the test box 1. The operator can control the device to hold or release the cable without contact, which is highly safe. The mechanical locking structure can withstand a certain amount of wind load and vibration after closing, ensuring the stability of the structure during the test.

[0028] Furthermore, the interval detection assembly includes a half-shaft sleeve 5, a motor 9, a detection kit 6, a lead screw 94, and two arc-shaped plates 7; the detection kit 6 consists of an upper detection element 61 and a lower detection element 62. After the upper detection element 61 and the lower detection element 62 are connected, they form a complete cylindrical structure. The split detection kit 6 corresponds to the box structure, which is convenient to separate and close with the opening and closing of the box. After closing, it forms a complete detection cavity.

[0029] The motor 9 is fixed inside the lower housing 12. The output end of the motor 9 is fixedly connected to a second gear 91. One end of the lead screw 94 passes through the side wall of the lower housing 12 and is fixedly connected to a third gear 92. The second gear 91 and the third gear 92 are meshed together. When the motor 9 starts, the lead screw 94 is driven to rotate through the cooperation of the second gear 91 and the third gear 92. A housing 93 is fitted on the outside of the second gear 91 and the third gear 92. The housing 93 protects the gear pair from dust and moisture, improving long-term reliability. The lead screw 94 is rotatably connected to the corresponding half-shaft sleeve 5. The lead screw 94 is connected to the upper detection element 61 through a screw drive.

[0030] Furthermore, the test gauge 4 is fixedly installed inside the upper housing 11 by the mounting bolt 41. The upper housing 11 and the lower housing 12 are provided with corresponding notches, which are semi-circular in shape, and a half-shaft sleeve 5 is fixedly connected in the corresponding notch. The inner diameter of the half-shaft sleeve 5 matches the outer diameter of the cable 10 to be tested. The semi-circular notch on the housing and the half-shaft sleeve 5 together form a positioning and sealing channel for the cable. The inner diameter of the half-shaft sleeve 5 matches the outer diameter of the cable, which not only restricts the position of the cable in the housing, but also cooperates with the flexible ring 63 to form a relative seal at both ends of the test section, reducing external interference.

[0031] It should be noted that the screw drive is a threaded drive. The upper detection element 61 is provided with a threaded hole or nut structure that mates with the thread of the lead screw 94. The lead screw 94 converts the rotational motion of the motor 9 into the linear motion of the upper detection element 61. The threaded drive has good self-locking properties and can stop at any position, ensuring that the detection element can be stably positioned at any set point when scanning the cable. A limit rod 95 is fixedly connected between the two half-shaft sleeves 5 on the lower housing 12, and the upper detection element 61 is slidably sleeved on the limit rod 95. A limit rod 95 and a guide rod 96 are fixedly connected between the two half-shaft sleeves 5 on the upper housing 11, and the lower detection element 62 is slidably sleeved on the limit rod 95 and the guide rod 96. Through the cooperation of the limit rod 95 and the guide rod 96, the detection kit 6 can be limited to moving only along the cable axis. The detection kit 6 can scan a section of cable at a constant speed or move gradually to perform fixed-point measurements, greatly enriching the detection modes and data acquisition density.

[0032] Both ends of the upper detection element 61 and the lower detection element 62 are fixedly connected to flexible rings 63. The flexible rings 63 are made of elastic material (such as silicone rubber) and have three functions: ① Sealing: They fit tightly against the cable surface, reducing the flow of air and interference signals inside and outside the detection zone; ② Adaptability: They can adapt to cables of different diameters within a certain range, ensuring versatility; ③ Buffering: They prevent rigid parts from scratching the cable insulation layer; ④ Cleaning: They can clean dirt from the cable surface during movement, improving detection accuracy. An arc plate 7 is set between the two flexible rings 63. Several detection sensors 71 are set on the inner side of the arc plate 7. The arc plate 7 has multiple embedded sensors, forming a multi-point synchronous detection array in the circumferential direction of the cable. Compared with single-point sensors, it can acquire the electric field, temperature, partial discharge and other signal distribution of the cable around the circumference at one time, providing more comprehensive information. A connecting ring 72 is fixedly connected to the outer wall of the arc plate 7. The upper detection element 61 and the lower detection element 62 are equipped with The receiving cavity 73 through which the connecting ring 72 passes ensures that the connecting ring 72 can rotate within the receiving cavity 73 when the housing is closed. The lower detection element 62 is also provided with several ball grooves 64. The upper detection element 61 corresponding to the ball grooves 64 is fixedly connected with several balls that match the ball grooves 64. The ball grooves 64 and the balls form a simple positioning and locking mechanism. When the housing is closed, the balls fall into the ball grooves 64, providing a closing confirmation feeling, helping to maintain the relative position of the upper and lower elements, assisting in docking accuracy, and ensuring that the lower detection element 62 can move with the upper detection element 61 when it moves.

[0033] The upper detection element 61 is also provided with a mounting groove, which is connected to the receiving cavity 73. A motor 65 is fixedly installed in the mounting groove, and a friction wheel 66 is fixedly connected to the output end of the motor 65. The position of the friction wheel 66 corresponds to the position of the connecting ring 72, and the outer side wall of the friction wheel 66 is in close contact with the outer side of the connecting ring 72. The motor 65 drives the friction wheel 66, and the friction wheel 66 drives the connecting ring 72 by friction, thereby driving the entire arc plate 7 to rotate around the cable axis. By rotating the arc plate 7, the limited sensors can simulate the effect of more detection points, or the same suspected defect can be re-checked from different angles, which greatly improves the flexibility of detection and the dimension of data. Combined with axial scanning, a two-dimensional fine grid scan of a section of cable cylinder surface is realized.

[0034] It should be noted that there is a gap between the detection sensor 71 and the outer surface of the cable under test 10. This is crucial for non-contact detection. Maintaining a fixed, tiny air gap allows for the sensing of electromagnetic fields, infrared radiation, and other signals from the cable while ensuring absolute electrical isolation and eliminating the risk of short circuits. The flexible ring 63 is tightly abutted against the outer surface of the cable under test 10. A signal transmitter 721 is located on the outer wall of one of the arc-shaped plates 7. A receiver 731 is fixedly connected inside the cavity 73 on the lower detection element 62. The positions of the signal transmitter 721 and the receiver 731 correspond, and the signal transmitter 721, the receiver 731, and the motor 65 are electrically connected. During the detection process, the controller of the motor 65 can control the motor 65 to drive the arc-shaped plate 7 to rotate a certain angle according to a preset program. The control method can be time-speed control or relative positioning through an encoder integrated on the motor 65. When a full scan is completed or calibration is required, the controller drives the arc-shaped plate 7 to rotate again until the "reference position" signal is found (see reference). Figure 8 (This is the reference position). At this time, the signal transmitter 721 is aligned with the receiver 731, the signal is received, and the motor 65 can be started and stopped accordingly. When a single detection task is completed or a stop command is received, the controller automatically drives the arc plate 7 to rotate back to the "reference position" and stop. This ensures that when the housing is opened, the arc plate 7 is in a retracted state that is flush with the joint point of the detection kit 6, avoiding interference or collision of internal moving parts during the opening and closing process, and improving the mechanical safety and lifespan of the device.

[0035] Furthermore, the inner side of the arc-shaped plate 7 is equipped with an insulating shielding mesh, forming a physical barrier between the detection sensor 71 and the operator. This isolates the weak leakage current that may be generated between the sensor and the cable, prevents arcing, and ensures the purity and safety of the sensor circuit. The inner side of the insulating shielding mesh is coated with a signal reflection coating, which can reflect the sound waves or electromagnetic wave signals generated on the cable surface and directed in all directions back to the sensor, enhancing the signal strength and improving the signal-to-noise ratio and detection sensitivity. Through the setting of the insulating shielding mesh and the signal reflection coating, the electromagnetic and acoustic environment inside the detection range is further optimized. On the one hand, it ensures safe isolation, and on the other hand, it actively enhances the signal to be measured, thereby improving the detection lower limit and reliability of the device at the hardware level. The arc-shaped plate 7, the detection sensor 71, and the detection meter 4 are electrically connected. The data collected by all detection sensors 71 (optional infrared, ultraviolet, ultrasonic, high-frequency current transformer, etc.) are transmitted to the detection meter 4 in real time through the shielded cable for processing, display, and storage.

[0036] In this embodiment, the operator controls the telescopic rod 21 to retract, which drives the upper housing 11 to open around the hinge through the transmission of rack 22-gear 23, sending the detection box 1 to the predetermined cable position, so that the cable is placed on the half-shaft sleeve 5 of the lower housing 12. Then, the operator controls the telescopic rod 21 to extend, driving the upper housing 11 to close smoothly, the ball meshes with the ball groove 64, the device is locked, the motor 9 is started, and the lead screw 94 is driven to rotate through the gear set. Under the drive of the lead screw 94 and the constraint of the limit rod 95, the upper detection element 61 will move along the cable axis with the lower detection element 62. The sensor array on the arc plate 7 inside performs continuous or point-by-point detection on the cable segment it passes through.

[0037] This embodiment aims to achieve comprehensive and repeatable scanning and inspection of the cable surface condition, wherein: Axial scanning motion: As the main scanning axis, it is driven by motor 9. Through the reduction and torque increase of gear 2 91 and gear 3 92, it drives the lead screw 94 to rotate. The upper detection element 61 forms a helical transmission pair with the rotating lead screw 94 through the internal thread structure. In order to prevent it from rotating with the lead screw 94, the limit rod 95 passes through the upper detection element 61 and forcibly restricts its degree of freedom to linear motion only along the cable axis. Thus, the continuous rotation of motor 9 is converted into uniform or stepping movement of the upper detection element 61 and its internal sensor array along the length of the cable.

[0038] Circumferential rotation scanning: As an auxiliary scanning axis, the motor 65 embedded in the upper detection element 61 drives the friction wheel 66, which drives the connecting ring 72 fixed to the arc plate 7 by friction, thereby driving the entire arc plate 7 and the detection sensor 71 mounted on it to rotate around the cable axis. Through integrated encoder or preset timing control, arbitrary angle indexing positioning can be achieved. The reference positioning system composed of signal transmitter 721 and receiver 731 provides an absolute physical zero point for rotational motion, which is used for system initialization and periodic error correction to ensure long-term repeatability accuracy of angle positioning.

[0039] The control unit can programmatically coordinate the two motion axes. A typical working mode is as follows: the axial scan advances by a set step, while the circumferential rotation performs a complete 360° scan or a fixed-point measurement of several equally divided angles (120°, 240°). This process essentially constructs a dense two-dimensional detection grid on the cylindrical surface of the cable, achieving point-by-point coverage of the detection area.

[0040] Traditional fixed ring sensor arrays have inherent dead angles related to their installation position. In this embodiment, the active rotation of the arc plate 7 enables a limited number of sensor units to detect every position in the circumferential direction of the cable. Combined with axial movement, this ultimately achieves a full-coverage scan of a section of cable cylindrical surface without dead angles. This significantly improves the detection rate of defects with directional characteristics (such as partial discharge and local overheating) and allows for cross-verification of suspected points from multiple angles, thereby improving the accuracy of defect identification and location.

[0041] The shielding and isolation strategy of this invention is hierarchical: First level: Macroscopic isolation of the outer casing. As mentioned above, the detection box 1, which consists of the upper casing 11 and the lower casing 12, serves as the outermost layer of protection, isolating it from wind, rain, strong light, and most external electromagnetic interference.

[0042] The second level: Inside the test box 1, the test kit 6 (composed of the upper test element 61 and the lower test element 62) itself constitutes a cylindrical structure. The flexible rings 63 installed at its two ends form a tight circumferential contact with the surface of the cable 10 under test due to their elasticity after the device is closed. Thus, the cylindrical wall of the test kit 6, the flexible rings 63 at both ends, and the surface of the cable segment being wrapped together define a "near-field test cavity" that is close to the cable and relatively isolated from the external box space.

[0043] The dynamic seal of the flexible ring 63 effectively limits the intrusion of possible airflow and dust dispersion into the core detection area within the detection chamber 1. The inner wall of the arc plate 7 is designed with an electromagnetic shielding layer, further filtering out low-frequency or high-frequency interference that seeps in from outside the chamber or is generated by other electrical components (such as motor 9 and driver) inside the chamber. This created "near-field detection cavity" has a relatively fixed size and shape, and the disturbance of the internal medium (air) is minimal, providing an extremely stable and clean working range for the detection sensor 71. Even with good shielding of the outer chamber, the operation of the drive mechanism inside the chamber (motor 9, gear meshing) may still generate vibration and electromagnetic noise. The near-field detection cavity formed by the detection kit 6, through physical separation and its own shielding design, greatly attenuates the impact of such internal interference sources on the high-sensitivity detection sensor 71. The sensor mainly senses the signal within its sealed small cavity, rather than the environmental noise of the entire chamber.

[0044] For the detection of electric fields, ultrasound, and ultra-high frequency signals, the detection efficiency of the sensor is closely related to the spatial structure between the signal sources. This "cavity-in-cavity" design standardizes this spatial structure, and the cylindrical structure also forms a beneficial waveguide or resonance effect (for specific frequencies), enhancing signal collection efficiency. The constant cavity size also makes sensor calibration and data interpretation more consistent. When the detection kit 6 moves along the cable axis, the flexible rings 63 at both ends continuously maintain the boundary of the near-field detection cavity during the sliding process. This allows the stable detection environment to move synchronously with the sensor array, ensuring that the sensor operates under optimized and consistent conditions throughout the scanning path, avoiding detection baseline drift caused by different positions.

[0045] Under the influence of its own weight, tension, wind load, and temperature changes, the overall shape (sag, swing, torsion) of overhead power transmission cables is large-scale, low-frequency, complex, and uncontrollable. In traditional non-contact testing, the sensor reference frame (such as a handheld stick or vehicle-mounted platform) is often independent of the cable. The relative motion between the two includes all the macroscopic shape changes of the cable from the detection point to the distant support point. This long-range uncertainty is directly coupled into the detection signal, forming severe background noise that is difficult to remove.

[0046] The device of the present invention does not attempt to track or adapt to the overall shape of the cable, but creatively constructs a "perfected detection section" with a finite length and highly defined geometric relationship on the cable temporarily.

[0047] Step 1: Establish two absolute spatial reference points (through the half-shaft sleeves 5). The upper housing 11 and lower housing 12 of the device each have two half-shaft sleeves 5. When the housing closes to hug the cable, these four half-shaft sleeves 5 form two radial constraint points with a fixed spacing on the cable. These two constraint points forcibly define the spatial positions of the two ends of the cable passing through this local section of the device. No matter how the cable hangs or swings outside these two points, the spatial direction of the cable segment between these two points has been basically determined by the rigid installation position of the half-shaft sleeves 5.

[0048] Step 2: Create an "ideal detection cavity" between reference points (through detection kit 6 and flexible ring 63). Within the section defined by the two half-shaft sleeves 5, detection kit 6 forms a rigid cylindrical structure that tightly wraps around the cable. The flexible rings 63 at both ends achieve sealed contact with the cable surface. The rigid cylinder further constrains any minor bends that may exist in this section of the cable, making its shape closer to the ideal cylindrical axis of the cylinder. The seal of the flexible ring 63 physically severs the continuous connection between the surface state of the cable within this detection section and the external cable. This allows the detection signals (such as surface electric field, temperature, and ultrasound) to mainly reflect the local state within this enclosed section, without being directly affected by the complex boundary conditions, vibration modes, or heat conduction from the external long cable.

[0049] Through the aforementioned partial interception and reshaping, the problem is fundamentally transformed from an infinitely long, uncertain object to a finitely long, definite object. The detection sensor 71 no longer needs to deal with an entire infinitely complex cable, but rather a standard space with a fixed length (determined by the length of the detection kit 6), clear boundaries, and controlled spatial orientation (defined by the half-shaft sleeve 5 and the detection kit 6). On this isolated section of cable, the relative distance and angular relationship between the array of detection sensors 71 and various points on the cable surface are determined solely by the internal mechanical structure of the detection kit 6 (such as the installation radius of the arc plate 7 and the thickness of the flexible ring 63). These are fixed dimensions that can be guaranteed during processing and assembly, and are independent of the macroscopic shape of the external cable.

[0050] Because the detection section is physically isolated, the electromagnetic field distribution, thermal field distribution, and sound propagation characteristics within it mainly depend on the local properties of the cable itself (such as insulation defects and poor contact of accessories), and are essentially decoupled from the changes in cable sag or vibration of support points hundreds of meters away. Therefore, the signal fluctuations measured by the sensor can be more purely attributed to changes in the local state of the cable, rather than long-range geometric fluctuations. Because background noise (caused by long-range macroscopic motion) is greatly suppressed, the signal-to-noise ratio of the detection signal is significantly improved. The detection results of the same device at the same location at different times or on different cables are highly comparable, providing a data foundation for quantitative state assessment and trend analysis. Traditional methods may only detect "abnormal signals here," but signal strength is greatly affected by macroscopic conditions. This invention enables signal strength to be more reliably correlated with the severity of local defects, supporting more accurate diagnosis and grading. This allows changes in detection signals (such as electric field strength, ultrasonic amplitude, and infrared temperature) to truly reflect changes in the cable surface state, rather than measuring geometric fluctuations, thereby fundamentally reducing the risk of false alarms and missed alarms and significantly improving the reliability and comparability of detection data.

[0051] Example 2, refer to Figures 5-12A baffle 81 is fixedly connected to the port of the lower detection element 62. A guide cavity 82 is formed between the inner side of the baffle 81 and the corresponding flexible ring 63. A slot 821 is opened in the lower detection element 62 corresponding to the guide cavity 82. The end of the slot 821 penetrates the side wall of the lower detection element 62. When the detection kit 6 moves, the flexible ring 63 scrapes off impurities on the surface of the cable. The scraped dust and dirt (such as salt frost and coal dust) are blocked by the baffle 81 and guided to the slot 821. The outer side of the lower detection element 62 is also fixedly connected to the baffle 81. A collection box 8 is fixedly connected. The upper side of the collection box 8 is open. The collection box 8 is used to collect dirt falling from the trough 821, preventing it from contaminating the inside of the device or scattering, and avoiding the impact of dust on detection. The outer side of the baffle 81 and the collection box 8 is flush with the port of the lower detection element 62. Cleaning the surface dirt not only improves the accuracy of subsequent detection (such as infrared temperature measurement and visible light inspection), but the dirt sample itself can also be used for analysis (such as equivalent salt density measurement). It is a multi-purpose device that improves inspection efficiency.

[0052] In this embodiment, after the detection kit 6 engages with the cable, the lip of the flexible ring 63 forms a tight contact with the cable surface. When the detection kit 6 begins axial movement (whether during detection scanning or resetting), the flexible ring 63, as the first contact element, physically scrapes away loose dust, salt deposits, oxides, and other contaminants adhering to the cable insulation surface. This step ensures that the cable surface and air medium within the near-field detection chamber are in optimal cleanliness before the formal scanning begins, eliminating background noise caused by contaminants (such as corona discharge and signal scattering) at the source. The scraped-off contaminants will not drift randomly within the detection range. At the port, the baffle 81 and the flexible ring 63 together form a funnel-shaped guide cavity 82. Under the influence of gravity and subsequent scraping, the contaminants are concentrated and guided to the entrance of the trough 821. The contaminants are discharged through the trough 821 out of the detection chamber and fall into the collection box 8 fixed outside the device. In the middle, the open upper side of the collection box 8 makes it easy to receive falling objects, while its closed side walls and bottom physically encapsulate the pollutants to prevent them from being scattered again.

[0053] The lenses and windows of optical sensors (such as infrared thermal imagers and ultraviolet imagers) have extremely high cleanliness requirements. This mechanism actively removes the main sources of contamination on the cable surface at the beginning of the scanning process and continues to clean it throughout the scanning process. This greatly reduces the particulate matter suspended in the confined space due to disturbance. This ensures the cleanliness of the optical path of the detection sensor 71 and avoids signal attenuation, scattering or image blurring caused by dirt adhesion, thus ensuring the original fidelity of the detection signal.

[0054] Contamination on cable surfaces, especially electrolytic contamination (such as salt), is a significant factor inducing surface leakage current and partial discharge under high-voltage electric fields. Within a closed enclosure, agitated dust particles may suspend near the high-voltage electrodes, forming random discharge points and generating strong background electrical noise. The active cleaning and collection mechanism of this device significantly reduces the risk of air ionization and the concentration of solid contaminants within the detection zone, thereby purifying the electromagnetic environment for detection and improving the signal-to-noise ratio and detection sensitivity of electromagnetic detection methods such as partial discharge and ultra-high frequency. The contaminants collected in collection box 8 are themselves information carriers of the cable's operating status, allowing for subsequent laboratory analysis (such as measuring equivalent salt density and analyzing contaminant composition). This provides direct evidence for assessing the external insulation condition and developing cleaning plans, achieving multi-purpose functionality and comprehensive diagnosis.

[0055] Example 2 involves the active physical removal of major contaminants (dust, salt deposits) before scanning. Example 1, through the construction of a "near-field detection chamber," isolates potentially residual trace suspended contaminants outside the core sensing area. The combination of these two methods achieves near-elimination of particulate contamination and electrolytic fouling noise, allowing the detection sensor 71 to operate in the clean medium environment of the "near-field detection chamber." This is fundamental to improving the clarity of infrared thermometry, the sensitivity of ultraviolet imaging, and the signal-to-noise ratio of partial discharge detection; half-shaft sleeve 5 By locking a local section of the cable, the limiting rod 95 / guide rod 96 and the detection kit 6 together create a scanning reference coordinate system with a defined spatial orientation. The constant thickness of the flexible ring 63 defines the nominal distance between the sensor and the cable surface. In embodiment two, active cleaning prevents uneven accumulation of dirt on the contact surface between the flexible ring 63 and the cable. Dirt accumulation can change the effective thickness and sealing of the ring, thereby disrupting the set constant gap. The cleaning mechanism ensures the long-term consistency of the "gap definition" function of the flexible ring 63, ensuring that the geometric relationship between the sensor and the target is highly repeatable and predictable for every measurement and every point acquisition along the entire scanning path. This directly transforms the signal amplitude changes caused by distance and angle fluctuations from "interference noise" into "negligible system errors," making the signal changes uniquely reflect the real changes in the cable surface state (temperature, discharge intensity), thus achieving quantitative detection.

[0056] Example 1 achieves data acquisition without blind spots through two-dimensional scanning, avoiding insufficient spatial sampling caused by fixed sensor arrangement. Example 2 reduces the electromagnetic and acoustic background noise level of the entire detection range through cleaning, and performs high spatial resolution full-domain signal acquisition in extremely low ambient background noise. This enables the device to not only detect weaker defect signals (improving sensitivity), but also to depict the spatial contour and intensity gradient of defects (improving positioning and quantification accuracy), thereby upgrading the detection from a simple "presence or absence judgment" to a complex "state imaging and level assessment".

[0057] Through the aforementioned synergy, this invention achieves a multidimensional leap in detection accuracy, ensuring high consistency in detection results for the same cable segment at different times, locations, and by different operators, supporting reliable trend analysis and lifespan prediction. The measured signal amplitudes (such as temperature, discharge, and ultrasonic dB values) can more realistically reflect the severity of defects, supporting risk classification and maintenance decisions. The combination of two-dimensional scanning and a stable geometric reference system can pinpoint the location of defects on the cable surface (axial distance, circumferential angle) at the centimeter or even millimeter level, greatly facilitating subsequent review and maintenance.

[0058] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail. The specific model and specifications of the relevant electrical components need to be selected and determined according to the actual specifications of the device. The specific selection and calculation method adopts the existing technology in the field, so it will not be described in detail.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A high-safety power equipment live detection device, comprising a detection box (1), a detection table (4) and a cable to be detected (10), the detection box (1) is composed of an upper box body (11) and a lower box body (12), characterized in that, Also includes: A flipping component is disposed on the rear side of the detection box (1) and is used to control the opening and closing state of the detection box (1); The interval detection component is located inside the detection box (1) and can detect the cable (10) to be tested within the closed interval.

2. The high-safety live-line detection device for power equipment according to claim 1, characterized in that, The upper housing (11) is fixedly connected to a hinge 1 (3), and the lower housing (12) is fixedly connected to a hinge 2 (31). The hinge 1 (3) and the hinge 2 (31) are matched and set together. The hinge 2 (31) is fixedly connected to a connecting rod (32), and the connecting rod (32) is rotatably connected to the hinge 2 (31).

3. The high-safety live-line detection device for power equipment according to claim 2, characterized in that, The flipping assembly includes a connecting plate (2) fixedly connected to the bottom of the upper housing (11) and a telescopic rod (21) fixedly connected to the connecting plate (2). A rack (22) is fixedly connected to the output end of the telescopic rod (21), and a guide rail (221) is fixedly connected to the top of the telescopic rod (21). The rack (22) and the guide rail (221) are slidably connected. A gear (23) is fixedly connected to the end of the connecting rod (32) corresponding to the rack (22), and the gear (23) meshes with the rack (22).

4. The high-safety live-line detection device for power equipment according to claim 3, characterized in that, The telescopic rod (21) is a pneumatic push rod or an electric push rod.

5. The high-safety live-line detection device for power equipment according to claim 1, characterized in that, The interval detection assembly includes a half-shaft sleeve (5), a motor (9), a detection kit (6), a lead screw (94), and two arc plates (7); the detection kit (6) consists of an upper detection element (61) and a lower detection element (62), and the upper detection element (61) and the lower detection element (62) are connected to form a complete cylindrical structure; the motor (9) is fixed inside the lower housing (12), and the output end of the motor (9) is fixedly connected to a gear two (91), one end of the lead screw (94) passes through the side wall of the lower housing (12) and its end is fixedly connected to a gear three (92), the gear two (91) and the gear three (92) are meshed, and a housing (93) is sleeved on the outer side of the gear two (91) and the gear three (92); the lead screw (94) is rotatably connected to the corresponding half-shaft sleeve (5), and the lead screw (94) is connected to the upper detection element (61) by a screw drive.

6. The high-safety live-line detection device for power equipment according to claim 5, characterized in that, The test gauge (4) is fixedly installed inside the upper housing (11) by the mounting bolt (41). The upper housing (11) and the lower housing (12) are provided with corresponding notches. The notches are semi-circular and a half-shaft sleeve (5) is fixedly connected in the corresponding notch. The inner diameter of the half-shaft sleeve (5) matches the outer diameter of the cable (10) to be tested.

7. The high-safety live-line detection device for power equipment according to claim 5, characterized in that, The helical drive is a threaded drive. The upper detection element (61) is provided with a threaded hole or nut structure that matches the thread of the lead screw (94). A limit rod (95) is fixedly connected between the two half-shaft sleeves (5) located on the lower housing (12), and the upper detection element (61) is slidably sleeved on the limit rod (95). A limit rod (95) and a guide rod (96) are fixedly connected between the two half-shaft sleeves (5) located on the upper housing (11), and the lower detection element (62) is slidably sleeved on the limit rod (95) and the guide rod (96).

8. The high-safety live-line detection device for power equipment according to claim 5, characterized in that, Both ends of the upper detection element (61) and the lower detection element (62) are fixedly connected to flexible rings (63). The arc plate (7) is disposed between the two flexible rings (63). The inner side of the arc plate (7) is provided with several detection sensors (71). The outer side wall of the arc plate (7) is fixedly connected to a connecting ring (72). The upper detection element (61) and the lower detection element (62) are provided with a receiving cavity (73) through which the connecting ring (72) passes. The lower detection element (62) is also provided with several ball grooves (64). The upper detection element (61) corresponding to the ball grooves (64) is fixedly connected with several spheres that match the ball grooves (64).

9. A high-safety live-line detection device for electrical equipment according to claim 8, characterized in that, The upper detection element (61) is also provided with a mounting groove, which is connected to the receiving cavity (73). A motor (65) is fixedly installed in the mounting groove. A friction wheel (66) is fixedly connected to the output end of the motor (65). The position of the friction wheel (66) corresponds to the position of the connecting ring (72). The outer wall of the friction wheel (66) is in close contact with the outer side of the connecting ring (72). There is a gap between the detection sensor (71) and the outer surface of the cable (10) to be tested. The flexible ring (63) is in close contact with the outer surface of the cable (10) to be tested. The outer wall of the arc plate (7) is provided with a signal transmitter (721), and the inside of the cavity (73) located on the lower detection element (62) is fixedly connected with a receiver (731). The positions of the signal transmitter (721) and the receiver (731) correspond. The signal transmitter (721), the receiver (731) and the motor (65) are electrically connected. The inner side of the arc plate (7) is provided with an insulating shielding mesh. The inner side of the insulating shielding mesh is coated with a signal reflection coating. The arc plate (7), the detection sensor (71) and the detection meter (4) are electrically connected.

10. A high-safety live-line detection device for power equipment according to claim 5, characterized in that, A baffle (81) is fixedly connected to the port of the lower detection element (62). A guide cavity (82) is formed between the inner side of the baffle (81) and the corresponding flexible ring (63). A slot (821) is opened in the lower detection element (62) corresponding to the guide cavity (82). The end of the slot (821) penetrates the side wall of the lower detection element (62). A collection box (8) is also fixedly connected to the outer side of the lower detection element (62). The upper side of the collection box (8) is open. The outer sides of the baffle (81) and the collection box (8) are flush with the port of the lower detection element (62).

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