On-site calibration device for voltage transformer

Abstract

The invention relates to a voltage transformer on-site calibration device, and belongs to the technical field of calibration, the voltage transformer on-site calibration device comprises a calibration device body, the side surface of the calibration device body is provided with a cable maintenance mechanism, the cable maintenance mechanism comprises a storage box and a cleaning assembly, and a cable body is stored in the storage box; the cleaning assembly comprises a limiting sliding rail, an adjusting sleeve is rotationally inserted into the middle of the limiting sliding rail in a penetrating mode, an adjusting plate is fixedly connected to the end, close to the storage box, of the adjusting sleeve, a plurality of arc-shaped adjusting grooves are evenly formed in the adjusting plate in the circumferential direction, and an adjusting block is slidably clamped into each arc-shaped adjusting groove. Sliding blocks in one-to-one correspondence with the adjusting blocks are installed on the limiting sliding rail in a sliding mode, movable supports are further vertically and fixedly connected to the sliding blocks, self-adaptive clamping assemblies are installed on the movable supports, and the other end of the cable body is arranged between the self-adaptive clamping assemblies. According to the invention, pollution of dust, moisture and the like on site to the cable is effectively avoided, the service life of the cable is remarkably prolonged, and the connection reliability is guaranteed.

Description

Technical Field

[0001] This invention relates to a field calibration device for voltage transformers, belonging to the field of calibration technology. Background Technology

[0002] In power systems, voltage transformers, as key measurement and protection devices, bear the important task of converting high-voltage signals into standard low-voltage signals. Their measurement accuracy and operational reliability directly affect the accuracy of core functions such as energy metering, relay protection, and system monitoring. To ensure the long-term stable operation of voltage transformers, their performance must be tested and calibrated periodically using dedicated calibration devices.

[0003] Verification equipment typically comes with multiple cables for signal transmission and power connection. These cables need to be stored after use, and their surfaces generally need to be cleaned before storage to remove dust, oil, moisture, or other contaminants adhering to the insulation sheath, thereby preventing contaminants from accelerating cable sheath aging and inducing a decline in insulation performance.

[0004] Currently, cleaning is mainly done manually. The effectiveness of manual cleaning is greatly affected by the skills, sense of responsibility, and working conditions of the personnel. It is easy to cause problems such as uneven cleaning, omissions, or secondary pollution, making it difficult to guarantee the cleaning quality of various parts of the cable, especially the joints and cable body connections. Therefore, it is urgent to improve the process. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, this invention designs a field calibration device for voltage transformers, which effectively avoids contamination of cables by dust and moisture on site, significantly extends the service life of cables, and ensures connection reliability.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A voltage transformer field calibration device includes a calibration device body, a cable maintenance mechanism installed on the side of the calibration device body, the cable maintenance mechanism including a storage box and a cleaning component, the cable body is stored inside the storage box, and one end of the cable body is electrically connected to the calibration device body. The cleaning component includes a limiting slide rail, with an adjusting sleeve rotatably inserted through the center of the limiting slide rail. An adjusting plate is fixedly connected to one end of the adjusting sleeve near the storage box. Multiple arc-shaped adjusting grooves are evenly arranged circumferentially on the adjusting plate, and an adjusting block is slidably engaged in each arc-shaped adjusting groove. A slider corresponding to each adjusting block is slidably installed on the limiting slide rail, and a movable support is vertically fixedly connected to each slider. An adaptive clamping component is installed on each movable support. The other end of the cable body passes through the side wall of the storage box and is positioned between the adaptive clamping components.

[0007] Furthermore, the adaptive clamping assembly includes a telescopic component vertically fixedly installed on the movable support, a cleaning wiper plate installed at the free end of the telescopic component, and a compression spring disposed between the telescopic component and the cleaning wiper plate. The telescopic component includes several telescopic rods arranged in parallel, and the compression spring is sleeved on the telescopic rods and fixedly connected to the cleaning wiper plate. The cleaning wipers of the multiple adaptive clamping assemblies are all sleeved around the cable body.

[0008] Furthermore, the storage box has a detachable lid on the front, and a sealing gasket is provided between the lid and the storage box.

[0009] Furthermore, the calibration device body is equipped with an overheat protection mechanism, which includes a transfer pump and a heat dissipation pipe. One end of the heat dissipation pipe is connected to the output end of the transfer pump, and the other end of the heat dissipation pipe extends outside the calibration device body. The heat dissipation pipe is provided with multiple heat dissipation fins evenly spaced on its body outside the calibration device body.

[0010] Furthermore, the calibration device body is equipped with a control circuit board and a storage battery inside. A control panel is installed on the top of the calibration device body. The control circuit board is electrically connected to the control panel. The control panel is electrically connected to the storage battery through a power cord. A box cover is also provided on the top of the calibration device body. The box cover is hinged to the calibration device body. A voltage transformer body that is electrically connected to the control circuit board is also installed on the outside of the calibration device body.

[0011] Furthermore, the main body of the calibration device is also equipped with a temperature control power-off mechanism, which includes an electric push rod and a temperature control switch for controlling the extension of the electric push rod. The output end of the electric push rod is connected to the power line, and both the electric push rod and the transfer pump are electrically connected to the temperature control switch.

[0012] Furthermore, the control circuit board includes an A / D module, a programmable gate array module, a CPU module, a control module, a voltage switching output module, a secondary bus, and a bus body.

[0013] Furthermore, a heat sink is mounted on the top of the control circuit board.

[0014] Furthermore, the cleaning wiping plate is equipped with a scraper.

[0015] Furthermore, the limiting slide rail is a cross-shaped slide rail, and the limiting slide rail is fixedly connected to the storage box through a mounting rod. Two sets of moving blocks are slidably installed on the limiting slide rail, and each set of moving blocks includes two relatively sliding sliders.

[0016] Compared with the prior art, the present invention has the following features and beneficial effects: 1. The cable maintenance mechanism of the present invention, consisting of an adjusting sleeve, adjusting plate, slider, movable support, and adaptive clamping assembly, combines cable cleaning function with cable storage process and can adapt to cables of different diameters. Under the action of a compression spring, the cleaning wiping plate, in conjunction with the scraper, can automatically and evenly scrape and clean the surface of the cable body when loading and unloading the cable, which can prevent corrosion caused by long-term accumulation of impurities. It solves the problems of low efficiency, easy omission, and uneven effect of manual cleaning. At the same time, the cleaned cable is neatly stored in a storage box with a sealed lid, which effectively avoids the contamination of the cable by dust and moisture on site, significantly extends the service life of the cable, and ensures the reliability of the connection.

[0017] 2. This invention, through the setting of an overheat protection mechanism, can actively exhaust internal hot air and efficiently dissipate heat, fundamentally improving the heat dissipation environment of the sealed chassis. At the same time, a temperature control power-off mechanism consisting of a temperature control switch and an electric push rod is added. When the internal temperature exceeds the limit, it can automatically cut off the connection between the power cord and the battery, realizing forced power-off protection. Through the dual safety design of active heat dissipation and active power-off, it effectively prevents the performance degradation, damage or even safety accidents of components caused by prolonged overheating, and greatly improves the working stability and safety of the device in harsh field environments.

[0018] 3. In terms of signal processing, the A / D module, through a grouped design, performs parallel acquisition and processing of signals from different groups of voltage transformers, significantly improving the real-time performance and accuracy of data processing. Simultaneously, the grouped design of the A / D module reduces signal interference, ensuring efficient acquisition and accurate analysis of the high-voltage signal from the busbar in complex field environments. Furthermore, the grouped design of the control module, responsible for switching between different signal paths, combined with the unified instruction distribution architecture of the CPU module, gives the device greater flexibility and reliability, enabling rapid response to voltage switching demands and avoiding the risk of system failure due to a single module malfunction. The programmable gate array (GGMA) module is used for real-time digital signal processing and logic generation, not only enhancing signal analysis capabilities but also dynamically updating logic according to field requirements, improving the device's adaptability and working efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the cable maintenance mechanism of the present invention; Figure 3 This is an exploded structural diagram of the cleaning component of the present invention; Figure 4 This is a schematic diagram of the internal structure of the verification device body of the present invention; Figure 5 yes Figure 4A magnified schematic diagram of the structure at point A; Figure 6 This is a schematic diagram of the installation structure of the overheat protection mechanism of the present invention; Figure 7 This is a schematic diagram of the connection of the control circuit board of the present invention.

[0020] The attached figures are labeled as follows: 1. Verification device body; 2. Overheat protection mechanism; 201. Radiator; 202. Transfer pump; 203. Battery; 204. Power cord; 205. Electric push rod; 206. Temperature control switch; 207. Heat dissipation fins; 208. Heat dissipation pipe; 3. Control panel; 4. Cable maintenance mechanism; 401. Storage box; 402. Box cover; 403. Mounting rod; 404. Adjusting sleeve; 405. Limiting slide rail; 406. 407. Slider; 408. Telescopic rod; 409. Compression spring; 4000. Adjusting plate; 4001. Adjusting block; 410. Arc-shaped adjusting groove; 411. Cleaning wiper; 412. Scraper; 413. Moving support; 5. A / D module; 6. Programmable gate array module; 7. CPU module; 8. Control module; 9. Voltage switching output module; 10. Secondary busbar; 11. Busbar body; 12. Voltage transformer body; 13. Cable body. Detailed Implementation

[0021] The present invention will now be described in more detail with reference to the embodiments.

[0022] Example 1 Please see Figures 1 to 3 The voltage transformer field calibration device of this embodiment includes a calibration device body 1, and a cable maintenance mechanism 4 is installed on the side of the calibration device body 1.

[0023] Specifically, the cable maintenance mechanism 4 includes a storage box 401 and a cleaning component. The storage box 401 contains the cable body 13. One end of the cable body 13 is electrically connected to the calibration device body 1. By storing the cable body 13 in the storage box 401, excessively long cable bodies 13 can be prevented from being exposed to the outside and causing wear, thus extending the service life of the cable body 13.

[0024] In this embodiment, a cover 402 is slidably and detachably installed on the front of the storage box 401. A sealing gasket is also provided between the cover 402 and the storage box 401. A winding rod is fixedly and rotatably installed in the storage box 401. By rotating the winding rod, the cable body 13 can be easily wound on the winding rod to prevent the cable body 13 from getting tangled. The cover 402 and the sealing design can protect the cable body 13 from the invasion of dust, moisture and impurities in the external environment.

[0025] Specifically, one end of the cable body 13 is electrically connected to the calibration device body 1, and the other end is provided to pass through the side wall of the storage box 401 and then be wrapped by the cable maintenance mechanism 4, and finally connected to the device to be tested for easy cleaning. The cable body 13 inside the storage box 401 is wound on the winding rod.

[0026] Please see Figure 3 , Figure 3 This is an exploded view of the cleaning component, which includes a limiting slide rail 405, which is a cross-shaped slide rail.

[0027] An adjusting sleeve 404 is rotatably inserted through the middle of the limiting slide rail 405. A circular adjusting plate 408 is fixedly connected to one end of the adjusting sleeve 404 near the storage box 401. Four arc-shaped adjusting grooves 410 are evenly arranged around the circumference of the adjusting plate 408. An adjusting block 409 is slidably engaged in each arc-shaped adjusting groove 410. A slider 406 corresponding to the adjusting block 409 is slidably installed on the limiting slide rail 405.

[0028] In this embodiment, there are four arc-shaped adjustment grooves 410, four adjustment blocks 409, and four sliders 406. The arc-shaped adjustment grooves 410, four adjustment blocks 409, and four sliders 406 correspond one-to-one. The four sliders 406 are divided into two groups of moving blocks. Each group of moving blocks includes two sliders 406 that slide relative to each other, which correspond to the cross-shaped limit rails 405.

[0029] Among them, a movable support 413 is vertically fixedly connected to the slider 406, and an adaptive clamping component is installed on each movable support 413. The other end of the cable body 13 passes through the side wall of the storage box 401 and is set between each adaptive clamping component. At the same time, the free end of the cable body 13 also moves through the adjusting sleeve 404.

[0030] In this embodiment, the number of adaptive clamping components is also four.

[0031] Operators can rotate the adjusting sleeve 404, causing the adjusting sleeve 404 to drive the adjusting plate 408 to rotate. As the adjusting plate 408 rotates, under the limiting action of the arc-shaped adjusting groove 410, it can push the adjusting block 409 to move. Since the adjusting block 409 is connected to the slider 406, and the slider 406 can only slide on the cross-shaped limiting slide rail 405, the slider 406 can drive the adaptive clamping component to move. Under the action of the cross-shaped limiting slide rail 405, the two relatively set adaptive clamping components can clamp or loosen synchronously, thereby adapting to cable bodies 13 of different diameters.

[0032] Please see Figure 2In this embodiment, the limiting slide rail 405 is fixedly connected to the storage box 401 by two mounting rods 403. One end of the mounting rod 403 is fixedly connected to the side of the limiting slide rail 405 away from the storage box 401, and the other end is fixedly connected to the side wall of the storage box 401.

[0033] Please see Figure 3 The adaptive clamping assembly includes a telescopic assembly vertically fixed on the movable support 413, a cleaning wiper 411 installed at the free end of the telescopic assembly, and a compression spring 4071 disposed between the telescopic assembly and the cleaning wiper 411.

[0034] Specifically, the telescopic assembly includes two telescopic rods 407 arranged in parallel. The telescopic ends of the telescopic rods 407 are fixedly connected to the cleaning wipers 411. A compression spring 4071 is sleeved on the telescopic ends of the telescopic rods 407 and fixedly connected to the cleaning wipers 411. The four cleaning wipers 411 are arranged around the cable body 13.

[0035] When the adaptive clamping assembly clamps the cable body 13, although the cleaning plate 411 will be subjected to the reaction force of the cable body 13, the elastic force of the compression spring 4071 can keep the cleaning plate 411 under pressure on the cable body 13, thereby enabling the cleaning plate 411 to always clean the cable body 13 and reverse clamping.

[0036] In this embodiment, the cleaning plate 411 is an arc-shaped plate to adapt to the shape of the cable body 13. A flexible scraper 412 is fixedly installed on the inner ring of the cleaning plate 411 near the adjustment plate 408. When the cable body 13 is retracted, the dirt on the cable body 13 can be scraped off by the scraper 412.

[0037] As can be seen from the above description, the beneficial effect of the present invention is that when storing cables, the operator rotates the adjusting sleeve 404 to drive the adjusting plate 408 to rotate, so that the adjusting block 409, which is engaged in the arc-shaped adjusting groove 410, moves, thereby driving the slider 406 to slide along the cross-shaped limiting slide rail 405. At this time, the adaptive clamping components on the four moving supports 413 can move closer or further away synchronously, thereby adapting to cable bodies 13 of different diameters.

[0038] When the cable body 13 passes through the space formed by the four cleaning wipers 411, the cleaning wipers 411 can continuously apply uniform pressure to the surface of the cable under the action of the compression spring 4071. Together with the scraper 412 on its inner side, the dust, attachments and other dirt on the surface of the cable body 13 can be automatically scraped off during the cable winding process, realizing automatic cleaning. This effectively solves the problems of low efficiency, easy omission and uneven effect of manual cleaning, and significantly improves the maintenance quality of the cable.

[0039] Meanwhile, the cable body 13 is neatly wound and stored in a storage box 401 with a sealing gasket and a cover 402, which avoids wear, moisture and contamination that may be caused by exposure to complex field environments, greatly extends the service life of the cable body 13 and ensures the reliability of the calibration device connection.

[0040] Example 2 Please see Figure 1 , Figure 4 , Figure 5 and Figure 6 The voltage transformer field verification device of this embodiment, based on the above embodiment one, has an overheat protection mechanism 2 installed inside the verification device body 1.

[0041] Please see Figure 6 The overheat protection mechanism 2 includes a transfer pump 202 and a heat dissipation pipe 208. The transfer pump 202 is fixedly connected to the inner wall of the calibration device body 1. One end of the heat dissipation pipe 208 is connected to the output end of the transfer pump 202, and the other end of the heat dissipation pipe 208 extends out of the calibration device body 1. The heat dissipation pipe 208 is provided with multiple heat dissipation fins 207 evenly spaced on the pipe body outside the calibration device body 1.

[0042] The transfer pump 202 is used to send the air inside the calibration device body 1 into the heat sink 208, and then the heat sink 208 transfers the heat to the heat sink fins 207 for heat dissipation.

[0043] The main body 1 of the verification device is equipped with a control circuit board and a storage battery 203. The top of the main body 1 of the verification device is equipped with a control panel 3. The control panel 3 is used to realize human-computer interaction. The control circuit board is electrically connected to the control panel 3. The control panel 3 is electrically connected to the storage battery 203 through a power cord 204. The storage battery 203 is used to provide power to maintain the normal operation of the equipment.

[0044] The top of the calibration device body 1 is also covered with a box cover, which is hinged to the calibration device body 1. The box cover serves to protect the control panel 3. A voltage transformer body 12 that is electrically connected to the control circuit board is also installed on the outside of the calibration device body 1.

[0045] In this embodiment, a temperature control power-off mechanism is also provided inside the body 1 of the calibration device. The temperature control power-off mechanism includes an electric push rod 205 and a temperature control switch 206 for controlling the extension of the electric push rod 205. One end of the electric push rod 205 is fixedly connected to the inner wall of the body 1 of the calibration device, and the other end of the electric push rod 205, that is, the output end of the electric push rod 205, is connected to the power line 204. The electric push rod 205 and the transfer pump 202 are both electrically connected to the temperature control switch 206.

[0046] When the temperature control switch 206 detects that the temperature inside the calibration device body 1 exceeds the preset safety threshold, it controls the start electric push rod 205 to extend, thereby pushing the power line 204 to disconnect from the battery 203, cutting off the power supply and protecting the equipment safety.

[0047] In this embodiment, the maximum temperature threshold set by the temperature control switch 206 is 50°C.

[0048] As can be seen from the above description, this embodiment uses an overheat protection mechanism 2 composed of a transfer pump 202, a heat pipe 208, and heat dissipation fins 207 to actively pump out the hot air inside the calibration device body 1 and efficiently dissipate heat through the heat dissipation fins 207, thereby effectively improving the heat dissipation environment inside the device and preventing the performance degradation or damage of core components caused by heat accumulation.

[0049] Meanwhile, the added temperature control power-off mechanism, consisting of a temperature control switch 206 and an electric push rod 205, enables real-time monitoring and active protection of the internal temperature. When the temperature control switch 206 detects that the temperature exceeds the safety threshold, it will immediately control the electric push rod 205 to move, pushing the power line 204 to disconnect it from the battery 203, thereby quickly cutting off the main power supply. This fundamentally avoids circuit failures, component burnout, or even safety accidents that may be caused by continuous overheating, greatly improving the reliability and safety of the device under complex on-site conditions, and providing dual protection for the long-term stable operation of the calibration device body 1.

[0050] Example 3 Please see Figure 7 The voltage transformer field verification device in this embodiment, based on the above embodiment two, includes an A / D module 5, a programmable gate array module 6, a CPU module 7, a control module 8, a voltage switching output module 9, a secondary bus 10, and a bus body 11 on the control circuit board.

[0051] Meanwhile, a heat sink 201 is installed on the top of the control circuit board. The heat sink 201 includes multiple heat sinks arranged in a uniform array. The heat sink 201 is attached to the CPU module 7 to quickly conduct and dissipate the heat generated by the CPU module 7 during operation.

[0052] In this embodiment, the control circuit board integrates signal acquisition, conversion, switching, and overheat protection functions through modular design and intelligent processing, comprehensively improving the performance and reliability of the device.

[0053] In terms of signal processing, A / D module 5 is divided into A / D module one and A / D module two. The verification device body 1 distributes the input signal acquisition and conversion functions to A / D module one and A / D module two, respectively, to perform parallel acquisition and processing of signals from different groups of voltage transformer bodies 12, which significantly improves the real-time performance and accuracy of data processing. At the same time, the grouping design of A / D module 5 reduces signal interference and ensures that the high voltage signal of bus body 11 can be efficiently acquired and accurately analyzed in complex field environments.

[0054] In addition, the control module 8 is divided into control module one and control module two, which are responsible for switching different signal paths respectively. Combined with the unified instruction distribution architecture of the CPU module 7, the device has higher flexibility and reliability, can quickly respond to voltage switching requirements, and avoid the risk of system failure due to the failure of a single module.

[0055] The Programmable Gate Array (GGMA) module 6 is used for real-time processing of digital signals and logic generation. It not only enhances signal analysis capabilities but also dynamically updates logic according to field requirements, improving the device's adaptability and working efficiency.

[0056] Meanwhile, the control panel 3 provides an intuitive human-computer interaction interface, enabling human-computer interaction functions, allowing users to monitor the device's operating status in real time and flexibly adjust parameter settings, thus improving the convenience of user operation and the reliability of device operation.

[0057] The voltage switching output module 9 is combined with the secondary bus 10 to ensure that the switched voltage signal is stably transmitted to downstream equipment.

[0058] As can be seen from the above description, this embodiment significantly improves the overall performance and reliability of the verification device through modular and intelligent control circuit board design. Specifically, the A / D module 5 adopts a group design (divided into A / D module one and A / D module two) to realize the parallel acquisition and processing of signals from different groups of voltage transformer bodies 12. This not only improves the real-time performance and accuracy of data processing, but also effectively reduces interference between signals, ensuring the acquisition accuracy and analysis reliability of the high voltage signal of the bus body 11 in complex field environments.

[0059] Meanwhile, the control module 8 also adopts a dual-module architecture (divided into control module one and control module two). Combined with the unified instruction distribution of the CPU module 7, the switching path control of the voltage signal is more flexible and reliable, which can quickly respond to switching requirements and effectively avoid the risk of system failure caused by the failure of a single module.

[0060] The programmable gate array module 6 enhances the device's real-time signal processing and logic generation capabilities, enabling it to be dynamically updated according to field requirements, thus improving adaptability and work efficiency. Furthermore, the heatsink 201, mounted on top of the control circuit board and attached to the CPU module 7, effectively strengthens the heat dissipation capacity of the core computing unit.

[0061] The coordinated operation of the voltage switching output module 9 and the secondary bus 10 ensures the stable transmission of the voltage signal to downstream equipment after switching. Combined with the human-machine interface provided by the control panel 3, it enables real-time monitoring of the operating status and flexible adjustment of parameters. This not only improves data processing capabilities, system reliability, and ease of operation, but also provides a high-performance and highly stable hardware foundation for the on-site verification of voltage transformers.

[0062] Working principle of the present invention: During operation, through the cable maintenance mechanism 4, when the user needs to connect the cable body 13 to the device to be tested, one end of the cable body 13 can be conveniently passed through the storage box 401 for operation. After the calibration is completed, the operator retracts the cable body 13. Before entering the storage box 401, the cable body 13 first passes through a cleaning assembly consisting of four cleaning blades 411. By pre-rotating the adjusting sleeve 404, the operator can link the adjusting plate 408, adjusting block 409, and slider 406 to make the four cleaning blades 411 fit the diameter of the cable body 13. Under the action of the compression spring 4071, the cleaning blades 411 and the scrapers 412 on them continuously and evenly press the surface of the cable. As the cable body 13 continues to retract, the scrapers 412 and cleaning blades 411 automatically scrape off and wipe away the dust, deposits, and other dirt attached to the outer sheath of the cable body 13. The cleaned cable body 13 is then neatly wound and stored in the sealed storage box 401, effectively avoiding secondary pollution and physical damage, and preparing it for the next use. Meanwhile, during the operation of the device, the control circuit board will generate heat. The transfer pump 202 of the overheat protection mechanism 2 will work continuously to pump the hot air inside the calibration device body 1 into the heat dissipation pipe 208. When the air flows through the pipe section outside the device equipped with heat dissipation fins 207, the heat is quickly dissipated into the surrounding environment to achieve active forced heat dissipation. At the same time, the temperature control power-off mechanism monitors the internal temperature in real time. Once the temperature control switch 206 detects that the temperature exceeds the preset safety threshold, it will immediately start the protection program: on the one hand, the transfer pump 202 will accelerate to enhance heat dissipation; on the other hand, the temperature control switch 206 will control the electric push rod 205 to extend and push the power cord 204 to disconnect it from the battery 203, thereby forcibly cutting off the power supply of the whole machine to prevent the components from being damaged or malfunctioning due to overheating. Finally, during voltage transformer verification, the secondary side signal input device of the voltage transformer under test 12 is used. After the high-voltage signal is introduced through the bus body 11, it is converted into a low-voltage signal by the voltage transformer body 12. The signal is then converted into a digital signal in groups and in parallel by A / D module one and A / D module two to reduce interference and improve acquisition accuracy. The converted digital signal is processed in real time by the programmable gate array module 6. The CPU module 7 acts as the control core to coordinate the process and issue instructions. According to the verification requirements, control module one and control module two switch the signal path through the voltage switching output module 9, so that the standard signal and the signal under test are sent into the comparison measurement circuit through the secondary bus 10. The control panel 3 provides a human-machine interface for parameter setting and status monitoring. The heat sink 201 and the overheat protection mechanism 2 work together to ensure the working temperature stability of the core components.

[0063] In the description of this invention, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0064] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0065] Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A field calibration device for voltage transformers, comprising a calibration device body (1), characterized in that: The side of the main body (1) of the verification device is equipped with a cable maintenance mechanism (4). The cable maintenance mechanism (4) includes a storage box (401) and a cleaning component. The storage box (401) contains a cable body (13). One end of the cable body (13) is electrically connected to the main body (1) of the verification device. The cleaning component includes a limiting slide rail (405), an adjusting sleeve (404) is rotatably inserted through the middle of the limiting slide rail (405), an adjusting plate (408) is fixedly connected to one end of the adjusting sleeve (404) near the storage box (401), a plurality of arc-shaped adjusting grooves (410) are evenly arranged along the circumference of the adjusting plate (408), an adjusting block (409) is slidably engaged in each arc-shaped adjusting groove (410), a slider (406) corresponding to the adjusting block (409) is slidably installed on the limiting slide rail (405), and a movable support (413) is vertically fixedly connected to the slider (406), an adaptive clamping component is installed on each movable support (413), and the other end of the cable body (13) passes through the side wall of the storage box (401) and is arranged between each adaptive clamping component.

2. The voltage transformer field verification device according to claim 1, characterized in that: The adaptive clamping assembly includes a telescopic assembly vertically fixedly installed on the movable support (413), a cleaning wiper (411) installed at the free end of the telescopic assembly, and a compression spring (4071) disposed between the telescopic assembly and the cleaning wiper (411). The telescopic assembly includes several telescopic rods (407) arranged in parallel. The compression spring (4071) is sleeved on the telescopic rods (407) and fixedly connected to the cleaning wiper (411). The cleaning wipers (411) of the multiple adaptive clamping assemblies are all sleeved on the outside of the cable body (13).

3. The voltage transformer field verification device according to claim 1, characterized in that: The storage box (401) has a detachable lid (402) on the front, and a sealing gasket is provided between the lid (402) and the storage box (401).

4. The voltage transformer field verification device according to claim 1, characterized in that: The verification device body (1) is equipped with an overheat protection mechanism (2). The overheat protection mechanism (2) includes a transfer pump (202) and a heat sink (208). One end of the heat sink (208) is connected to the output end of the transfer pump (202), and the other end of the heat sink (208) extends out of the verification device body (1). The heat sink (208) is provided with multiple heat sink fins (207) evenly spaced on the tube body outside the verification device body (1).

5. The voltage transformer field verification device according to claim 4, characterized in that: The main body (1) of the verification device is equipped with a control circuit board and a storage battery (203). A control panel (3) is installed on the top of the main body (1). The control circuit board is electrically connected to the control panel (3). The control panel (3) is electrically connected to the storage battery (203) through a power line (204). A box cover is also provided on the top of the main body (1). The box cover is hinged to the main body (1). A voltage transformer body (12) electrically connected to the control circuit board is also installed on the outside of the main body (1).

6. The voltage transformer field verification device according to claim 5, characterized in that: The main body (1) of the calibration device is also equipped with a temperature control power-off mechanism. The temperature control power-off mechanism includes an electric push rod (205) and a temperature control switch (206) for controlling the extension of the electric push rod (205). The output end of the electric push rod (205) is connected to the power line (204), and the electric push rod (205) and the transfer pump (202) are both electrically connected to the temperature control switch (206).

7. A voltage transformer field verification device according to claim 5, characterized in that: The control circuit board includes an A / D module (5), a programmable gate array module (6), a CPU module (7), a control module (8), a voltage switching output module (9), a secondary bus (10), and a bus body (11).

8. The voltage transformer field verification device according to claim 5, characterized in that: A heat sink (201) is installed on the top of the control circuit board.

9. A voltage transformer field verification device according to claim 2, characterized in that: The cleaning wiping plate (411) is provided with a scraper (412).

10. A voltage transformer field verification device according to claim 2, characterized in that: The limiting slide rail (405) is a cross-shaped slide rail, and the limiting slide rail (405) is fixedly connected to the storage box (401) through the mounting rod (403). Two sets of moving blocks are slidably installed on the limiting slide rail (405), and each set of moving blocks includes two relatively sliding sliders (406).

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