A photovoltaic box transformer core insulation detection device

Abstract

The present invention relates to the field of power detection technology, and more specifically, to a photovoltaic box transformer core insulation detection device, comprising a support device, a fixing device arranged above the support device, a driving device arranged inside the fixing device, a detection system for core insulation detection, and a transmission device for transmitting power of the driving device. The photovoltaic box transformer core insulation detection device fixes the clamp current sensor in the detection system on the outer wall of the limit slider, and cooperates with the support device, so that when the detection personnel perform the core insulation detection, the clamp current sensor can always remain perpendicular to the core, effectively reducing the angle error caused by manual hand-holding, thereby ensuring the stability of the detection.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power detection, and in particular to a photovoltaic box transformer iron core insulation detection device. Background Art

[0002] The insulation test of the PV box transformer core is an important part of ensuring the safe operation of the PV power station. During the test, attention should be paid to safe operation, and standard safety measures and professional testing instruments should be used to ensure the accuracy of the test results. Through regular insulation testing, insulation problems can be discovered and dealt with in a timely manner to ensure the safe operation of the PV box transformer core.

[0003] The patent application number CN202321334137.1 discloses a photovoltaic box transformer core insulation detection device, including a megohmmeter, a terminal, a dial, a generator, a crank and a uniform rocker mechanism. The left sides of the front and rear parts of the megohmmeter are connected to the terminal, the top of the megohmmeter is connected to the dial, the right side of the megohmmeter is connected to the generator, the right side of the generator is rotatably connected to the crank, and the megohmmeter is provided with a uniform rocker mechanism for uniformly rotating the crank. By pulling the pull rope to wind up the spring box, the spring box controls the uniform rotating part to rotate, and then through the operation of the connection sleeve and the crank, the crank can be driven to move at a uniform speed to generate electricity for the generator, thereby improving the convenience of the detection operation.

[0004] In the existing manual detection method, when the inspector holds the clamp current sensor for detection, it is difficult to ensure that the sensor always remains perpendicular to the iron core, and the angle deviation may cause measurement errors and affect the stability of the detection. In addition, when the manual hand-held sensor is moved up and down, it is difficult to control the speed and stability of the movement. At the same time, the clamp current sensor may accidentally contact the iron core, which will affect the measurement results.

[0005] In view of this, we propose a photovoltaic box transformer core insulation detection device. Summary of the invention

[0006] The object of the present invention is to provide a photovoltaic box transformer core insulation detection device to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A photovoltaic box transformer core insulation detection device comprises a supporting device, a fixing device arranged above the supporting device, a driving device arranged inside the fixing device, a detection system for core insulation detection, and a transmission device for transmitting power of the driving device;

[0009] The detection system includes a clamp current sensor and a current tester and a transmission line connected therebetween;

[0010] The fixing device comprises a fixing bracket, an outer convex bin arranged at the upper and lower ends of the right side wall of the fixing bracket, and a rotating part arranged inside the fixing bracket;

[0011] The rotating part includes a rotating rod and a limiting slider that moves as the rotating rod rotates;

[0012] The driving device comprises a driving motor, a screw rod arranged on the output shaft of the driving motor, and a moving frame that moves as the screw rod rotates;

[0013] The detection system also includes two parallel limit rods and a docking gear arranged at the top of the limit rods;

[0014] The transmission device comprises two parallel transmission wheels and a transmission belt sleeved between the two transmission wheels.

[0015] In the technical solution of the present invention, the supporting device includes a tripod, a supporting rod threadedly connected to the center rod at the top of the tripod, and a fixing clamp arranged on the outer side wall of the supporting rod.

[0016] In the technical solution of the present invention, the fixed bracket is clamped and fixed at the top position of the support rod, and a limiting slide groove that penetrates inside and outside is opened on the right side wall of the fixed bracket. The external convex warehouse is fixedly connected to the outer wall of the fixed bracket by screws, and the outer walls of the left and right ends of the external convex warehouse located above are provided with warehouse wall slide grooves.

[0017] In the technical solution of the present invention, the upper and lower ends of the rotating rod are respectively rotatably connected to the outer side walls of the upper and lower ends of the fixed bracket, the center rod at the top of the rotating rod extends to the top surface of the fixed bracket, a cam groove is opened on the outer side wall of the rotating rod, and the top of the center rod of the rotating rod is clamped with a rod end gear.

[0018] In the technical solution of the present invention, the transverse cross-section of the limit slider is L-shaped, the limit slider is slidably connected to the inside of the limit slide groove, the inside of the limit slider is rotatably connected to a block cam shaft, and the end of the block cam shaft extends to the inside of the cam groove.

[0019] In the technical solution of the present invention, the driving motor is fixedly connected to the outer wall of the outer convex plate at the top of the fixed bracket by screws, the screw rod is coaxially connected to the output shaft of the driving motor and is rotatably connected to the outer wall of the outer convex plate at the top of the fixed bracket, the movable frame is threadedly connected to the screw rod, and the movable frame is slidably connected to the inside of the warehouse wall slide groove.

[0020] In the technical solution of the present invention, a second tooth plate is welded on the front side wall of the moving frame, and a first tooth plate is welded on the rear side wall of the moving frame.

[0021] In the technical solution of the present invention, the clamp current sensor is fixedly connected to the outer wall of the limit slider by screws, and a slot matching the size of the limit rod is opened inside the center rod at the end of the two clamp heads inside the clamp current sensor, and the current tester is clamped inside the fixing clamp.

[0022] In the technical solution of the present invention, the convex rods at the upper and lower ends of the limit rod are rotatably connected to the outer side walls of the upper and lower outer convex bins respectively, and docking gears are clamped and fixed at the end positions of the limit rod, and the two docking gears are meshed with each other.

[0023] In the technical solution of the present invention, the transmission wheel is rotatably connected to the inner warehouse wall of the upper outer convex warehouse, and the outer wall of the transmission wheel close to one end of the mobile frame is provided with a wheel wall ring tooth, and the wheel wall ring tooth is meshed with the second tooth plate, and the transmission wheel away from one end of the mobile frame is fixed on the top surface of one of the docking gears through the center rod at the bottom end.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The photovoltaic box transformer core insulation detection device fixes the clamp current sensor in the detection system on the outer wall of the limit slider, and cooperates with the support device to enable the detection personnel to always keep the clamp current sensor perpendicular to the core when performing core insulation detection, effectively reducing the angle error caused by manual holding and ensuring the stability of the detection.

[0026] 2. The photovoltaic box transformer core insulation detection device drives the mobile frame to move through the driving motor. It will first cooperate with the transmission device to connect the front ends of the two clamp heads of the clamp current sensor. The detection personnel can use the current tester to detect the insulation of the core in a stable state, and then cooperate with the rotating part to let the clamp current sensor perform dynamic detection on the core. While automating the detection, it improves the accuracy of the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic cross-sectional view of a part of the structure of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the supporting device in the present invention;

[0030] Figure 4 It is a schematic cross-sectional view of the structure of the fixing device in the present invention;

[0031] Figure 5 It is a structural schematic diagram of the rotating part in the present invention;

[0032] Figure 6 It is a schematic diagram of the structure of the driving device in the present invention;

[0033] Figure 7 It is a structural schematic diagram of the detection system in the present invention;

[0034] Figure 8 It is a partial structural schematic diagram of the detection system in the present invention;

[0035] Fig. 9 It is a structural schematic diagram of the transmission device in the present invention;

[0036] Description of reference numerals:

[0037] 100, supporting device; 110, tripod; 120, supporting rod; 130, fixing clamp;

[0038] 200, fixing device; 210, fixing bracket; 211, limiting slide groove; 220, outer convex bin; 221, bin wall slide groove; 230, rotating part; 231, rotating rod; 2310, cam groove; 232, rod end gear; 233, limiting slider; 234, block convex shaft;

[0039] 300, driving device; 310, driving motor; 320, screw rod; 330, moving frame; 340, first tooth plate; 350, second tooth plate;

[0040] 400, detection system; 410, clamp current sensor; 420, current tester; 430, transmission line; 440, limit rod; 450, docking gear;

[0041] 500, transmission device; 510, transmission wheel; 520, transmission belt; 530, wheel wall ring teeth. DETAILED DESCRIPTION

[0042] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] See also Figure 1-Figure 9 As shown, this embodiment provides a technical solution:

[0044] A photovoltaic box transformer core insulation detection device comprises a supporting device 100, a fixing device 200 arranged above the supporting device 100, a driving device 300 arranged inside the fixing device 200, a detection system 400 for core insulation detection, and a transmission device 500 for transmitting power of the driving device 300;

[0045] In the present invention, the support device 100 includes a tripod 110, a support rod 120 threadedly connected to the top center rod of the tripod 110, and a fixing clamp 130 disposed on the outer side wall of the support rod 120;

[0046] Furthermore, the tripod 110 cooperates with the support rod 120 to ensure the stability of the supporting device 100 and improve the fixing base point for the fixing device 200 , and the fixing clamp 130 is used to improve the fixing base point for the structure in the detection system 400 .

[0047] In this embodiment, Figure 4-Figure 5 As shown, the fixing device 200 includes a fixing bracket 210, an outer convex chamber 220 disposed at the upper and lower ends of the right side wall of the fixing bracket 210, and a rotating part 230 disposed inside the fixing bracket 210;

[0048] Specifically, the rotating portion 230 includes a rotating rod 231 and a limiting slider 233 that moves as the rotating rod 231 rotates.

[0049] Furthermore, the fixed bracket 210 is clamped and fixed at the top position of the support rod 120, and a limiting slide groove 211 that penetrates inside and outside is opened on the right side wall of the fixed bracket 210. The external convex warehouse 220 is fixedly connected to the outer wall of the fixed bracket 210 by screws, and the outer walls of the left and right ends of the external convex warehouse 220 located at the top are provided with warehouse wall slide grooves 221.

[0050] Furthermore, the upper and lower ends of the rotating rod 231 are respectively rotatably connected to the outer side walls of the upper and lower ends of the fixed bracket 210, the center rod at the top of the rotating rod 231 extends to the top surface of the fixed bracket 210, and a cam groove 2310 is opened on the outer side wall of the rotating rod 231, and the top of the center rod of the rotating rod 231 is clamped with a rod end gear 232.

[0051] Furthermore, the transverse cross-section of the limit slider 233 is L-shaped, the limit slider 233 is slidably connected to the inside of the limit slide groove 211, and the inside of the limit slider 233 is rotatably connected to the block cam shaft 234, and the end of the block cam shaft 234 extends to the inside of the cam groove 2310.

[0052] Furthermore, the fixed bracket 210 is used to ensure the strength of the overall structure of the fixing device 200, the limiting slide groove 211 is used to limit the moving range of the limiting slider 233, and the outer convex warehouse 220 located above is used to increase the placement range for the structures in the transmission device 500 and the driving device 300. When the rotating rod 231 rotates as a whole, the position where the end of the block convex shaft 234 contacts the wall of the cam groove 2310 continuously changes, thereby driving the limiting slider 233 to move in the limiting slide groove 211.

[0053] In this embodiment, Figure 6 As shown, the driving device 300 includes a driving motor 310, a screw rod 320 disposed on the output shaft of the driving motor 310, and a moving frame 330 that moves as the screw rod 320 rotates;

[0054] Specifically, the driving motor 310 is fixedly connected to the outer wall of the outer convex plate at the top of the fixed bracket 210 by screws, the screw rod 320 is coaxially connected to the output shaft of the driving motor 310 and is rotatably connected to the outer wall of the outer convex plate at the top of the fixed bracket 210, the moving frame 330 is threadedly connected to the screw rod 320, and the moving frame 330 is slidably connected to the inside of the warehouse wall slide groove 221.

[0055] Furthermore, a second tooth plate 350 is welded on the front side wall of the moving frame 330 , and a first tooth plate 340 is welded on the rear side wall of the moving frame 330 .

[0056] Furthermore, after the driving motor 310 is started, it drives the lead screw 320 to rotate, and drives the moving frame 330 to move. When the moving frame 330 moves, the first tooth plate 340 and the second tooth plate 350 are moved at the same time. The first tooth plate 340 is used to cooperate with the rod end gear 232 to drive the rotating rod 231 to rotate, and the second tooth plate 350 is used to cooperate with the structure in the transmission device 500 to drive the internal structure to rotate.

[0057] In this embodiment, Figure 7-Figure 8 As shown, the detection system 400 includes a clamp current sensor 410 and a current tester 420 and a transmission line 430 connected therebetween;

[0058] Specifically, the detection system 400 further includes two limit rods 440 arranged in parallel and a docking gear 450 arranged at the top of the limit rods 440 .

[0059] Furthermore, the clamp current sensor 410 is fixedly connected to the outer wall of the limit slider 233 by screws, and a slot matching the size of the limit rod 440 is opened inside the center rods of the two clamp heads inside the clamp current sensor 410, and the current tester 420 is clamped inside the fixing clamp 130.

[0060] Furthermore, the convex rods at the upper and lower ends of the limiting rod 440 are rotatably connected to the outer side walls of the upper and lower outer convex bins 220 respectively, and the end positions of the limiting rod 440 are clamped and fixed with docking gears 450, and the two docking gears 450 are meshed with each other.

[0061] Furthermore, the clamp current sensor 410 uses the principle of current transformer to measure the current in the iron core. If there is an insulation problem with the iron core at this time, an additional current loop will be generated, and the clamp current sensor 410 can then detect these abnormal currents. The current tester 420 is used to receive and process the current signal measured by the clamp current sensor 410, convert the current signal into a voltage signal, and finally display the measurement result after amplification, filtering, and A / D conversion. By comparing the current under normal circumstances with the detected current, it is determined whether there is an insulation fault in the iron core. The transmission line 430 is used to transmit the electrical signal of the clamp current sensor 410 to the interior of the current tester 420. When the docking gear 450 rotates, it drives the two limit rods 440 to rotate, and drives the two clamp heads in the clamp current sensor 410 to rotate.

[0062] In this embodiment, Fig. 9 As shown, the transmission device 500 includes two parallel transmission wheels 510 and a transmission belt 520 sleeved between the two transmission wheels 510;

[0063] Specifically, the transmission wheel 510 is rotatably connected to the inner wall of the upper outer convex warehouse 220, and a wheel wall ring tooth 530 is sleeved on the outer wall of the transmission wheel 510 close to one end of the movable frame 330, and the wheel wall ring tooth 530 is meshed with the second gear plate 350, and the transmission wheel 510 away from the movable frame 330 is fixed on the top surface of one of the docking gears 450 through the center rod at the bottom.

[0064] Furthermore, as the moving frame 330 moves, the second tooth plate 350 will come into contact with the wheel wall ring tooth 530 in the transmission device 500, driving the wheel wall ring tooth 530 and the transmission wheel 510 to rotate together, and through the transmission belt 520, driving the other transmission wheel 510 to rotate, and then driving the docking gear 450 below to rotate at the same time, so that the two clamp heads of the clamp current sensor 410 will wrap the iron core inside it.

[0065] Finally, it should be noted that the drive motor 310, clamp current sensor 410 and current tester 420 involved in the present invention are all universal standard parts or parts known to technical personnel in this field, and their structures and principles are all known to technical personnel in this field through technical manuals or through conventional experimental methods. In the idle space of this device, the drive motor 310 is connected to the external power supply through a wire. The specific connection method should refer to the working principle of the present invention. The electrical connection between each electrical component is completed in a sequential working order, and the detailed connection methods are all well-known technologies in the field.

[0066] When the photovoltaic box transformer core insulation detection device of the present invention is used, first, the support device 100 is placed at the rear end where the core detection is required, and the clamp head end of the clamp current sensor 410 in the detection system 400 is ensured to extend to the front of the core;

[0067] Next, the driving motor 310 in the driving device 300 is started to drive the screw rod 320 to rotate, thereby driving the moving frame 330 to move;

[0068] As the moving frame 330 moves, the second tooth plate 350 will collide with the wheel wall ring gear 530 in the transmission device 500, driving the wheel wall ring gear 530 and the transmission wheel 510 to rotate together, and through the transmission belt 520, driving the other transmission wheel 510 to rotate, and then driving the docking gear 450 below to rotate at the same time, so that the two clamp heads of the clamp current sensor 410 will cover the iron core inside;

[0069] Subsequently, the driving motor 310 is turned off, and the clamp current sensor 410 and the current tester 420 are turned on. The clamp current sensor 410 uses the principle of current transformer to measure the current in the iron core. If there is an insulation problem in the iron core at this time, an additional current loop will be generated, and the clamp current sensor 410 can then detect these abnormal currents. The current tester 420 is used to receive and process the current signal measured by the clamp current sensor 410, convert the current signal into a voltage signal, and finally display the measurement result after amplification, filtering, and A / D conversion processing, and judge whether there is an insulation fault in the iron core by comparing the current under normal conditions with the detected current;

[0070] After that, the driving motor 310 is started again to drive the moving frame 330 to move, and the first tooth plate 340 then contacts the rod end gear 232, so that the rotating rod 231 rotates as a whole. At this time, the contact position between the end of the block convex shaft 234 and the groove wall of the cam groove 2310 keeps changing, thereby driving the limit slider 233 to move in the limit slide groove 211, thereby driving the clamp current sensor 410 to move up and down on the outside of the iron core;

[0071] Subsequently, the inspector observes the value on the current tester 420, records the average value of the dynamic value change, and compares the current under normal conditions with the detected current again to ensure the accuracy of the detected value.

[0072] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the specification and its equivalents.

Claims

1. A photovoltaic box transformer core insulation detection device, comprising a supporting device (100), a fixing device (200) arranged above the supporting device (100), a driving device (300) arranged inside the fixing device (200), a detection system (400) for core insulation detection, and a transmission device (500) for transmitting power of the driving device (300); The detection system (400) comprises a clamp current sensor (410) and a current tester (420) and a transmission line (430) connected therebetween; Features: The fixing device (200) comprises a fixing bracket (210), an outer convex bin (220) arranged at the upper and lower ends of the right side wall of the fixing bracket (210), and a rotating part (230) arranged inside the fixing bracket (210); A limiting sliding groove (211) that penetrates inside and outside is opened on the right side wall of the fixed bracket (210), and a warehouse wall sliding groove (221) is opened on the outer side walls of the left and right ends of the outer convex warehouse (220) located above; The rotating part (230) comprises a rotating rod (231) and a limiting slider (233) that moves as the rotating rod (231) rotates; The upper and lower ends of the rotating rod (231) are respectively rotatably connected to the outer side walls of the upper and lower ends of the fixed bracket (210); the center rod at the top end of the rotating rod (231) extends to the top surface of the fixed bracket (210); a cam groove (2310) is provided on the outer side wall of the rotating rod (231); and a rod end gear (232) is clamped at the top end of the center rod of the rotating rod (231); The transverse cross section of the limiting slider (233) is L-shaped, the limiting slider (233) is slidably connected to the inside of the limiting slide groove (211), the inside of the limiting slider (233) is rotatably connected to a block convex shaft (234), and the end of the block convex shaft (234) extends to the inside of the cam groove (2310); The driving device (300) comprises a driving motor (310), a screw rod (320) arranged on the output shaft of the driving motor (310), and a moving frame (330) that moves as the screw rod (320) rotates, and the moving frame (330) is slidably connected to the interior of the warehouse wall slide groove (221); The detection system (400) further comprises two parallel-arranged limiting rods (440) and a docking gear (450) arranged at the top of the limiting rods (440); The clamp current sensor (410) is fixedly connected to the outer wall of the limit slider (233) by means of screws, a slot matching the size of the limit plug rod (440) is provided inside the center rods at the ends of the two clamp heads inside the clamp current sensor (410), and the current tester (420) is clamped inside the fixing clamp (130); The transmission device (500) comprises two parallel transmission wheels (510) and a transmission belt (520) sleeved between the two transmission wheels (510).

2. The photovoltaic box transformer core insulation detection device according to claim 1 is characterized in that: The support device (100) comprises a tripod (110), a support rod (120) threadedly connected to a center rod at the top of the tripod (110), and a fixing clamp (130) arranged on an outer side wall of the support rod (120).

3. The photovoltaic box transformer core insulation detection device according to claim 2 is characterized in that: The fixing bracket (210) is clamped and fixed at the top end of the support rod (120), and the outer convex bin (220) is fixedly connected to the outer side wall of the fixing bracket (210) by means of screws.

4. The photovoltaic box transformer core insulation detection device according to claim 3 is characterized in that: The driving motor (310) is fixedly connected to the outer wall of the outer convex plate at the top of the fixed bracket (210) by screws, the screw rod (320) is coaxially connected to the output shaft of the driving motor (310) and is rotatably connected to the outer wall of the outer convex plate at the top of the fixed bracket (210), and the movable frame (330) is threadedly connected to the screw rod (320).

5. The photovoltaic box transformer core insulation detection device according to claim 4 is characterized in that: A second tooth plate (350) is welded on the front side wall of the moving frame (330), and a first tooth plate (340) is welded on the rear side wall of the moving frame (330).

6. The photovoltaic box transformer core insulation detection device according to claim 5 is characterized in that: The convex rods at the upper and lower ends of the limiting rod (440) are rotatably connected to the outer side walls of the upper and lower outer convex bins (220), and a docking gear (450) is clamped and fixed at the end position of the limiting rod (440), and the two docking gears (450) are meshed with each other.

7. The photovoltaic box transformer core insulation detection device according to claim 6 is characterized in that: The transmission wheel (510) is rotatably connected to the inner wall of the upper outer convex warehouse (220); a wheel wall ring tooth (530) is sleeved on the outer wall of the transmission wheel (510) close to one end of the movable frame (330); the wheel wall ring tooth (530) and the second tooth plate (350) are meshed with each other; the transmission wheel (510) at one end away from the movable frame (330) is fixed to the top surface of one of the docking gears (450) by clamping the center rod at the bottom end.

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