A non-disassembly lightning arrester fault current detection device

Abstract

The utility model relates to circuit fault detection device technical field, and disclose a kind of non-disassembly lightning arrester fault current detection device, including detector, two connecting wires and fixed component, two micro-current transmitters are built-in detector, each phase line has multiple lightning arrester, normal time is parallel ground connection, after breakdown fault of certain branch, the rest normal lightning arrester is connected in series with fault lightning arrester, device is output adjustable DC high voltage by high voltage generator, most of the fault lightning arrester forms fault loop, another road is formed normal leakage loop by line and multiple parallel lightning arrester, fault current is much larger than normal leakage current, two micro-current transmitters detect tiny current value, PLC receives signal analysis and judges fault side line, touch screen displays current value and points out fault side, power fast repair, lower clamp seat and upper clamp seat are fixed by coil spring drive and mutually close, recess surface and assembly cylinder, rotating roller and other structures, guarantee and line connection stability, improve detection accuracy.

Description

Technical Field

[0001] This utility model relates to the technical field of circuit fault detection devices, and in particular to a non-disassembly surge arrester fault current detection device. Background Technology

[0002] During the operation of a wind farm, if the surge arrester breaks down and becomes grounded when the collector line is struck by lightning, it will cause the high-voltage circuit breaker of the collector line to trip, resulting in the entire collector line losing power due to the lightning strike. In this case, it is necessary to find the grounding point of the line in time and deal with the fault. Power can only be restored after the insulation resistance of the line returns to normal.

[0003] Among various fault points, locating high-resistance breakdown faults in line surge arresters is a challenging aspect of maintenance. A typical collector line connects 4-11 box-type transformers, each equipped with 3 surge arresters on its drop-out fuse mechanism. Adding the 3 surge arresters on the line terminal tower, the total number of surge arresters on the entire collector line can reach up to 36. Furthermore, the length of the collector line is typically 5-15 kilometers, which undoubtedly increases the difficulty of maintenance caused by high-resistance breakdown faults in surge arresters.

[0004] Because high-resistance breakdown faults in surge arresters do not leave obvious external traces, damaged arresters are difficult to detect through ordinary line inspections. Current maintenance methods require removing suspected damaged arresters one by one from the line for testing, with 12 arresters per phase. This method is not only time-consuming and labor-intensive but also inefficient, severely impacting the speed of power restoration to the collector lines and adversely affecting the normal operation of wind farms. Summary of the Invention

[0005] The technical problem to be solved by this utility model is that the existing technology has the disadvantages of difficulty in finding high-resistance breakdown faults in surge arresters and low efficiency of existing maintenance methods. Therefore, a non-disassembly surge arrester fault current detection device is proposed.

[0006] To achieve the above objectives, this application adopts the following technical solution: a non-detachable surge arrester fault current detection device, comprising a detector, wherein two micro current transmitters are installed inside the detector, two connecting wires are fixedly connected to one end of the detector, and a fixing component is fixedly connected to the end of the connecting wires away from the detector, the fixing component comprising a lower clamp and an upper clamp, an assembly cylinder is fixedly connected to the side of the lower clamp near the upper clamp, a rotating roller is built into the assembly cylinder, multiple coil springs are sleeved at both ends of the rotating roller, a moving seat is provided in the middle of the rotating roller, an assembly hole is opened at one end of the moving seat, the moving seat is sleeved and fixed to the surface of the rotating roller through the assembly hole, a protruding window is opened on the side of the assembly cylinder away from the lower clamp, and the end of the moving seat away from the rotating roller passes through the protruding window and is fixedly connected to the upper clamp.

[0007] Preferably, both the lower clamp and the upper clamp have multiple evenly distributed perforated windows on their surfaces.

[0008] Preferably, the end faces of the lower clamp and the upper clamp that are close to each other are provided with grooves.

[0009] Preferably, a connecting seat is fixedly connected to one end of the lower clamp, and the end of the connecting seat away from the lower clamp is fixedly connected to the connecting wire.

[0010] Preferably, the rotating roller coincides with the axis of the assembly cylinder.

[0011] Preferably, a fixing plate is rotatably sleeved at both ends of the rotating roller, and the end of the fixing plate away from the rotating roller is fixedly connected to the lower clamp.

[0012] Preferably, the plurality of coil springs are arranged uniformly along the length of the assembly cylinder.

[0013] Preferably, one end of the coil spring is fixedly connected to the inner wall of the assembly cylinder, and the other end of the coil spring is fixedly connected to the rotating roller.

[0014] The technical effects and advantages of this utility model are as follows: This utility model device consists of a detector, two connecting wires, and a fixing assembly. The detector has two built-in micro-current transmitters. Taking the collector lines of multiple transformer substations as an example, each phase of the line has multiple surge arresters, which are normally connected in parallel to ground. After one arrester breaks down, the remaining normal surge arresters are connected in series with the faulty arrester. The device outputs an adjustable DC high voltage (with low current limiting to ensure safety) through a high-voltage generator. The current is divided into two paths: most of it forms a fault loop through the faulty surge arrester, and the other path forms a normal leakage loop through the line and multiple parallel surge arresters. The fault current is much larger than the normal leakage current. The two micro-current transmitters detect the minute current value, the PLC receives the signal, analyzes and judges the faulty side of the line, and the touch screen displays the current value and indicates the faulty side, facilitating rapid repair. Its lower and upper clamps are driven to approach and fix each other by a coil spring. The hollowed-out window, grooved surface, assembly cylinder, and rotating roller structure ensure stable connection with the line and improve detection accuracy. The device can find faults without removing other surge arresters, saving disassembly and assembly steps and improving efficiency. High voltage current limiting ensures safety, and the detection logic reduces the risk of misoperation. The micro current transmitter and PLC ensure accurate detection. It is suitable for lines with long distances and a large number of surge arresters, effectively solving the problem of finding high-resistance breakdown faults. Attached Figure Description

[0015] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2For the present utility model Figure 1 Enlarged structural diagram at point A in the middle; Figure 3 This is a schematic diagram of the fixing component structure of this utility model; Figure 4 This is an exploded view of the fixing component of this utility model; Figure 5 This is a schematic diagram of the detection method of this utility model.

[0016] Legend: 1. Detector; 101. Connecting wire; 2. Fixing component; 201. Lower clamp; 202. Upper clamp; 203. Hollowed-out window; 204. Groove surface; 205. Connecting seat; 206. Assembly cylinder; 207. Rotating roller; 208. Fixing plate; 209. Coil spring; 210. Protruding window; 211. Moving seat; 212. Assembly hole. Detailed Implementation

[0017] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0018] Reference Figures 1 to 5 As shown, this utility model provides a technical solution: a non-detachable surge arrester fault current detection device, including a detector 1. Two micro-current transmitters are installed inside the detector 1. Two connecting wires 101 are fixedly connected to one end of the detector 1, and a fixing component 2 is fixedly connected to the end of the connecting wires 101 away from the detector 1. Taking the collector lines of 11 transformer substations as an example, each phase of the collector line has 12 surge arresters. This can be understood as 12 surge arresters connected between that phase line and the ground. Under normal circumstances, all surge arresters are connected to ground in parallel. When one surge arrester experiences a breakdown fault, it can be understood that the 11 normal surge arresters are connected in parallel to that phase line and in series with the faulty surge arrester, connected to the ground. The above analysis leads to the following conclusions: If a high-voltage current is applied at the connection point between the ground and the surge arrester, the current flow in the line is as follows: most of the high-voltage current generated by the high-voltage generator flows back from the faulty surge arrester through the ground to the high-voltage generator, forming a fault current loop. The other path flows through the line, the 11 parallel surge arresters, the ground, and the high-voltage generator, forming a normal leakage current loop. The fault current in this case is much larger than the normal leakage current. Therefore, by simply detecting the current values ​​of the two branches at the surge arrester connection point, the damaged surge arrester can be quickly located. This method does not require the removal of any other surge arresters before locating the faulty one, making it convenient, fast, safe, and reliable.

[0019] The detector 1 has a built-in PLC. The function of the PLC is to receive the detection signals transmitted from the micro current transmitter, perform logic processing and analysis on these signals, and then determine which micro current transmitter is detecting the faulty side of the circuit, providing a basis for the subsequent display of fault information on the touch screen.

[0020] The high-voltage generator outputs adjustable DC 1-25kV high-voltage electricity (current limited to below 10mA to ensure the personal safety of maintenance personnel in case of accidents). Two micro-current detection transmitters detect a current value of 5mA. The PLC receives the detection signals from the transmitters and performs logic processing and analysis to determine which micro-current transmitter is detecting the faulty line. The current values ​​of the two lines are displayed on the touch screen, indicating the line where the faulty micro-current transmitter is located. Maintenance personnel can use the instrument to analyze the fault and quickly repair it.

[0021] Furthermore, the fixing assembly 2 includes a lower clamping seat 201 and an upper clamping seat 202. Both the lower clamping seat 201 and the upper clamping seat 202 have multiple evenly distributed perforated windows 203 on their surfaces. The end faces of the lower clamping seat 201 and the upper clamping seat 202 that are close to each other have grooved surfaces 204. A connecting seat 205 is fixedly connected to one end of the lower clamping seat 201. The end of the connecting seat 205 away from the lower clamping seat 201 is fixedly connected to a connecting wire 101. An assembly cylinder 206 is fixedly connected to the side of the lower clamping seat 201 closest to the upper clamping seat 202. A rotating roller 207 is built into the assembly cylinder 206. The axis of the rotating roller 207 coincides with that of the assembly cylinder 206. Fixing plates 208 are rotatably sleeved at both ends of the rotating roller 207. The fixing plates 208 are located away from the upper clamping seat 202. One end of the rotating roller 207 is fixedly connected to the lower clamp 201. Multiple coil springs 209 are sleeved at both ends of the rotating roller 207, evenly arranged along the length of the assembly cylinder 206. One end of each coil spring 209 is fixedly connected to the inner wall of the assembly cylinder 206, and the other end is fixedly connected to the rotating roller 207. A moving seat 211 is located in the middle of the rotating roller 207. One end of the moving seat 211 has an assembly hole 212, through which it is sleeved and fixed to the surface of the rotating roller 207. A protruding window 210 is provided on the side of the assembly cylinder 206 away from the lower clamp 201. The end of the moving seat 211 away from the rotating roller 207 passes through the protruding window 210 and is fixedly connected to the upper clamp 202. The coil springs 209 drive the two clamps to move closer together and fix them in place, ensuring a sufficiently stable connection with the circuit and improving detection accuracy.

[0022] Before locating the faulty surge arrester, no other surge arresters need to be removed, saving the tedious steps of removing and reinstalling other surge arresters, greatly shortening the preparation time before maintenance and improving maintenance efficiency.

[0023] Safe and reliable: The high-voltage generator limits the current to below 10mA, ensuring the personal safety of maintenance personnel in case of accidents; at the same time, the device can accurately identify the faulty side of the circuit through scientific current detection and logic analysis, reducing the safety risks caused by misoperation.

[0024] Precise detection: Two micro-current transmitters can accurately detect current values ​​of 5mA. The PLC performs logical processing and analysis on the detection signals, which can accurately identify the faulty side of the circuit. The touch screen clearly displays relevant information, providing maintenance personnel with precise fault location guidance.

[0025] Highly adaptable: Suitable for power line lengths of 5-15 kilometers and up to 36 surge arresters, capable of handling complex line environments and effectively solving the problem of difficult fault location for high-resistance breakdown of line surge arresters.

[0026] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A non-disassembly surge arrester fault current detection device, characterized in that, The device includes a detector, which has two microcurrent transmitters installed inside. Two connecting wires are fixedly connected to one end of the detector. A fixing component is fixedly connected to the end of the connecting wires away from the detector. The fixing component includes a lower clamp and an upper clamp. An assembly cylinder is fixedly connected to the side of the lower clamp near the upper clamp. A rotating roller is built into the assembly cylinder. Multiple coil springs are sleeved at both ends of the rotating roller. A moving seat is provided in the middle of the rotating roller. An assembly hole is opened at one end of the moving seat. The moving seat is sleeved and fixed to the surface of the rotating roller through the assembly hole. A protruding window is opened on the side of the assembly cylinder away from the lower clamp. The end of the moving seat away from the rotating roller passes through the protruding window and is fixedly connected to the upper clamp.

2. The non-detachable surge arrester fault current detection device according to claim 1, characterized in that: Both the lower clamp and the upper clamp have multiple evenly distributed perforated windows on their surfaces.

3. The non-detachable surge arrester fault current detection device according to claim 1, characterized in that: The lower clamp and the upper clamp both have grooved surfaces on their close-to-each end faces.

4. The non-detachable surge arrester fault current detection device according to claim 1, characterized in that: One end of the lower clamp is fixedly connected to a connecting seat, and the end of the connecting seat away from the lower clamp is fixedly connected to a connecting wire.

5. The non-detachable surge arrester fault current detection device according to claim 1, characterized in that: The rotating roller coincides with the axis of the assembly cylinder.

6. The non-detachable surge arrester fault current detection device according to claim 1, characterized in that: The rotating roller is rotatably sleeved with fixed plates at both ends, and the end of the fixed plate away from the rotating roller is fixedly connected to the lower clamp.

7. The non-detachable surge arrester fault current detection device according to claim 1, characterized in that: The multiple coil springs are evenly arranged along the length of the assembly cylinder.

8. The non-detachable surge arrester fault current detection device according to claim 1, characterized in that: One end of the coil spring is fixedly connected to the inner wall of the assembly cylinder, and the other end of the coil spring is fixedly connected to the rotating roller.

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