Shielding device for partial discharge test of mutual inductor with voltage class of 35KV and below 35KV

Abstract

A shielding device for a partial discharge test of a mutual inductor with the voltage class of 35KV and below comprises a grounded shielding case and a moving part used for controlling the shielding case to be folded or unfolded, the whole shielding case is a conical shell composed of a plurality of arc-shaped shells, and the arc-shaped shells are arranged in a staggered mode; the moving part comprises a base and a track mounted on the base, a power source is arranged in the track and drives the arc-shaped shell to move along the track, the track guides and limits the movement of the arc-shaped shell, and the test accuracy and efficiency are improved by adopting an electromagnetic shielding technology. The design of the conical shell enhances the structural stability, optimizes the space utilization rate, and improves the electromagnetic shielding effectiveness. The quick unfolding and folding design of the movable arc-shaped shell improves the test preparation efficiency. The high-conductivity iron material ensures stable operation and long-term reliability of the shielding case. The device is flexible, efficient and suitable for various environments due to the design of moving parts, and the reliability and practicability of the system are improved.

Description

Technical Field

[0001] The invention relates to the technical field of partial discharge test equipment, and in particular to a shielding device for partial discharge test of transformers of voltage levels of 35KV and below. Background Art

[0002] The partial discharge test is a test item that must be carried out for the acceptance test of dry-type transformers with voltage levels of 35kV and below. Partial discharge is an early sign of aging, defects or damage of insulating materials. Through testing, potential problems can be discovered early to avoid equipment failures. By detecting partial discharge, the insulation state of the equipment can be evaluated, the risk of electrical fires and electric shocks can be reduced, and the safety of operators and equipment can be ensured. Regular partial discharge tests can help maintain and improve the long-term reliability of equipment and reduce unexpected downtime. The test results can provide data support for equipment maintenance and overhaul, help formulate scientific and reasonable maintenance plans, and optimize resource allocation. The regulations require that the discharge should not be greater than 50pC when the voltage is 1.2Um / √3 to prevent insulation breakdown caused by cumulative effects.

[0003] In the actual partial discharge test of dry-type transformers, due to the interference of the test environment, such as electromagnetic interference, temperature and humidity changes, noise interference, and poor grounding, the measured discharge amount is often much greater than 50pC, and it is difficult to make an accurate judgment on whether the test results are qualified. Among them, electromagnetic interference may come from nearby high-voltage equipment, transmission cables, communication facilities, and radio transmission sources, etc., causing the partial discharge detection instrument to receive false discharge signals, affecting the accuracy of the test results. Specifically, due to the interference of the test environment, the measured discharge amount is often much greater than 50pC, and it is difficult to make an accurate judgment on whether the test results are qualified. Summary of the invention

[0004] In view of the above-mentioned problems existing in the existing shielding device used for partial discharge test of transformers with voltage levels of 35KV and below, the present invention is proposed.

[0005] Therefore, the purpose of the present invention is to provide a shielding device for partial discharge test of transformers with voltage levels of 35KV and below, which aims to improve the accuracy and reliability of partial discharge test, so as to better evaluate the insulation state of dry-type transformers and ensure the safe and stable operation of power systems.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a shielding device for partial discharge test of transformers with voltage levels of 35KV and below, comprising a grounded shielding cover and a moving component for controlling the folding, stowing or unfolding of the shielding cover, wherein the shielding cover as a whole is a conical shell composed of multiple arc-shaped shells, and the multiple arc-shaped shells are arranged in an staggered manner; the moving component comprises a base and a track installed on the base, a power source is arranged in the track, the power source drives the arc-shaped shell to move along the track, and the track guides and limits the movement of the arc-shaped shell.

[0007] As a preferred solution of the shielding device for partial discharge test of transformers with voltage levels of 35KV and below described in the present invention, the shielding cover is made of high-conductivity material and is grounded through copper wire.

[0008] As a preferred solution of the shielding device for partial discharge test of transformers with voltage levels of 35KV and below described in the present invention, the base includes an annular bracket and a plurality of universal wheels installed at the bottom of the annular bracket, and the bottom of one of the arc-shaped shells is installed on the upper surface of the annular bracket.

[0009] As a preferred solution of the shielding device for partial discharge test of transformers with voltage levels of 35KV and below described in the present invention, the track includes two guide rails, both of which are arranged in a large semicircular ring shape, the two guide rails are staggered, and one end thereof is located on the same straight line, and an arc-shaped shell is slidably arranged on each guide rail.

[0010] As a preferred solution of the shielding device for partial discharge test of transformers with voltage levels of 35KV and below described in the present invention, the arc-shaped shell is provided with three pieces, one of which is fixed, and the other two pieces slide along the respective guide rails through guide wheels provided at the bottom.

[0011] As a preferred solution of the shielding device for partial discharge test of transformers with voltage levels of 35KV and below described in the present invention, the power source is provided with two groups, corresponding to the two guide rails respectively, and the power source is provided in the form of a belt and is connected to the two movable arc-shaped shells.

[0012] As a preferred solution of the shielding device for partial discharge test of transformer with voltage level of 35KV and below described in the present invention, the power source includes a belt, and a tensioning wheel and a driving wheel installed at both ends of the belt, and the driving wheel is connected to the motor.

[0013] As a preferred solution of the shielding device for partial discharge test of transformers with voltage levels of 35KV and below described in the present invention, a bending piece for adjusting the belt angle is also provided in the guide rail.

[0014] As a preferred solution of the shielding device for partial discharge test of transformers with voltage levels of 35KV and below described in the present invention, a belt clamp is also provided on the belt, the belt clamp is clamped on the belt and one end of the belt clamp is installed on the bottom of the movable arc-shaped shell.

[0015] As a preferred solution of the shielding device for partial discharge test of transformers with voltage levels of 35KV and below described in the present invention, the motor is also electrically connected to a controller, and the controller is wirelessly connected to an external wireless remote control switch for controlling the motor.

[0016] Beneficial effects of the present invention: It is specially designed for partial discharge tests of transformers with voltage levels of 35KV and below, and uses electromagnetic shielding technology to effectively suppress electromagnetic interference and improve test accuracy and efficiency. The conical shell design of the shielding cover not only enhances structural stability and optimizes space utilization, but also improves the electromagnetic shielding effectiveness, so that the internal space of the shielding cover is fully utilized, while keeping the external dimensions compact for easy transportation and storage. The rapid deployment capability benefits from the rapid unfolding and folding design of the movable arc-shaped shell, which significantly improves the test preparation efficiency. The selection of highly conductive iron materials combines multiple factors such as electromagnetic shielding performance, mechanical strength, heat dissipation performance and material processability to ensure the stable operation and long-term reliability of the shielding cover in various environments. The introduction of a wireless remote control switch improves the convenience and safety of operation, reduces maintenance costs and time, and makes the shielding device more flexible and efficient in practical applications.

[0017] The shielding device of the present invention has significant advantages in the design of moving parts, providing an efficient, flexible and stable operating experience. The annular bracket and multiple universal wheels equipped on the base enable the entire device to be easily moved and positioned, and the staggered large semicircular ring rails on the track cooperate with the power source to enable the arc-shaped shell to slide smoothly along the track, thereby realizing the rapid deployment and folding of the shielding cover. This design not only improves the deployment speed of the device, but also enhances its adaptability and flexibility in different environments. Each arc-shaped shell is grounded through a copper wire to ensure effective shielding of electromagnetic interference, while the belt drive method of the power source ensures the stability of power transmission and the accuracy of control. Overall, the design of the moving parts makes the shielding device more convenient to operate and more economical to maintain, while at the same time improving the reliability and practicality of the entire system while ensuring the shielding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 The overall structural diagram of the shielding device of the present invention used for partial discharge test of transformers with voltage levels of 35KV and below.

[0020] Figure 2 It is a schematic diagram of the overall structure of the arc-shaped housing of the present invention.

[0021] Figure 3 It is a schematic diagram of the overall structure of the moving parts of the present invention.

[0022] Figure 4 It is a schematic diagram of the overall structure of the guide rail of the present invention.

[0023] Figure 5 The figure is a schematic diagram of the power source structure of a partial internal section of the guide rail of the present invention.

[0024] In the figure:

[0025] 100, shielding cover; 101, arc-shaped housing; 101a, guide wheel; 101b, rotating ring; 102, copper wire;

[0026] 200, moving part; 201, base; 201a, ring bracket; 201b, universal wheel; 202, track; 202a, guide rail; 203, power source; 203a, belt; 203b, tensioning wheel; 203c, driving wheel; 203d, motor; 203e, bending piece; 203f, belt clamp; 203g, controller; 203h, stop body. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0030] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0031] Example 1

[0032] Reference Figure 1 , which is the first embodiment of the present invention, provides a shielding device for partial discharge test of transformers with voltage levels of 35KV and below. The design of the shielding device adopts electromagnetic shielding technology to effectively suppress electromagnetic interference. The main function of electromagnetic shielding technology is to control the propagation path, intensity and range of electromagnetic waves by blocking, reflecting or absorbing electromagnetic fields. The working principle of this technology includes three key aspects: Blocking: The shielding device uses shielding materials to confine the electromagnetic field to a specific area to prevent it from spreading outward to reduce the impact on the external environment. Reflection: When electromagnetic waves encounter shielding materials, part of the electromagnetic waves will be reflected back, which can reduce the amount of electromagnetic waves that penetrate to the other side of the shielding material. Absorption: Shielding materials can also absorb part of the energy of electromagnetic waves and convert them into other forms of energy (such as heat energy), further reducing the propagation of electromagnetic waves.

[0033] Through this shielding device, the dry-type transformer can shield the external high-frequency pulse interference signal during the partial discharge test, thereby improving the accuracy of the test results. In addition, the device can shorten the test time and significantly improve the test efficiency. The shielding device optimizes the operation process of the transformer partial discharge test, solves the problem of the lack of dedicated shielding devices in the current market, and reduces the stringent requirements for the on-site test environment. In short, this shielding device not only improves the accuracy and efficiency of the test, but also simplifies the test process and reduces dependence on the environment.

[0034] Specifically, the shielding cover 100 is made of high-conductivity iron material. The detailed explanation is as follows: (1) High conductivity: High-conductivity iron material means that this material has high conductivity and can conduct electricity effectively. This is crucial for electromagnetic shielding, because high-conductivity materials can quickly guide electromagnetic interference to the ground line, thereby reducing the impact of electromagnetic waves on the equipment. (2) Reduce electric field concentration: High-conductivity iron materials can reduce the concentration and uneven distribution of electric fields. This is because metal materials can redistribute the electric field to make it more uniform, thereby reducing the impact of partial discharge and ensuring the accuracy of test results. (3) Electromagnetic shielding performance: High-conductivity iron materials have good electromagnetic shielding performance and can effectively isolate external electromagnetic interference. This material can block, reflect or absorb electromagnetic fields, control the propagation path, intensity and range of electromagnetic waves, protect test equipment and measurement results, and ensure the stability of the experimental environment. (4) Mechanical strength and durability: High-conductivity iron materials generally have high mechanical strength and durability and can withstand mechanical stress that may occur during the experiment. This protects the internal test equipment and prevents damage caused by mechanical stress. (5) Heat dissipation performance: When current passes through, high-conductivity iron materials can effectively disperse heat and help maintain the stability of the test environment. Good heat dissipation performance can avoid additional failures caused by temperature rise and ensure the stable operation of the equipment. (6) Considerations for material selection: When selecting the material of the shielding cover 100, in addition to high conductivity, factors such as material processability, cost, corrosion resistance, weight, heat dissipation performance, and whether welding is required should also be considered. The performance of high-conductivity iron materials in these aspects makes them an ideal choice for the shielding cover 100. (7) Factors affecting shielding effectiveness: Shielding effectiveness is affected by many factors, including the electrical conductivity, magnetic permeability, thickness, etc. of the material. The high electrical conductivity and appropriate magnetic permeability of high-conductivity iron materials, as well as sufficient thickness, work together to provide effective shielding effectiveness. In summary, high-conductivity iron materials as materials for the shielding cover 100 can provide efficient electromagnetic shielding, reduce electric field concentration, protect test equipment, ensure the accuracy of test results, and maintain the stability of the experimental environment.

[0035] Example 2

[0036] Reference Figure 1-Figure 5 In order to improve the convenience and efficiency of the test, we have made further improvements to the shielding device. The following is the second embodiment of the present invention, which is mainly different from the first embodiment in that we have developed a shielding device specifically for partial discharge testing of transformers with voltage levels of 35kV and below. The design of this device takes into account the convenience of actual operation and aims to provide a more effective partial discharge test environment for transformers with voltage levels of 35kV and below. Through this improvement, we expect to achieve a more accurate and efficient test process.

[0037] It includes a shielding cover 100 and a moving component 200 for controlling the folding, stowing or unfolding of the shielding cover 100, wherein the shielding cover 100 as a whole is a conical shell composed of multiple arc-shaped shells 101, and the multiple arc-shaped shells 101 are arranged in a staggered manner; the moving component 200 includes a base 201 and a track 202 installed on the base 201, and a power source 203 is arranged in the track 202. The power source 203 drives the arc-shaped shell 101 to move along the track 202, and the track 202 guides and limits the movement of the arc-shaped shell 101.

[0038] It should be explained that the shielding cover 100 of the present invention is composed of multiple arc-shaped shells 101 that are staggered to achieve convenient and efficient deployment. Specifically, one of the arc-shaped shells 101 is fixed and does not participate in the movement; in the folded state, the three arc-shaped shells 101 overlap together for easy storage and transportation. The other two arc-shaped shells 101 are respectively located inside and outside the fixed arc-shaped shell 101. They are movable and can be driven by the power source 203 at the bottom to perform unfolding and folding operations. And a swivel 101b is provided at the upper end of each arc-shaped shell 101, and the three swivels 101b overlap and are locked by plugging and plugging the rotating shaft to ensure the connection and rotation between the upper ends of the three arc-shaped shells 101.

[0039] When the shielding cover 100 needs to be unfolded, the two movable arc-shaped shells 101 inside and outside are driven by their respective power sources 203 to move to the left and right along the preset track 202, one arc-shaped shell 101 moves to the left and the other moves to the right, until one side of them overlaps with each other, and the other side of the arc-shaped shell 101 that has not been separated from the fixed arc-shaped shell 101 also overlaps with it, and finally forms a closed and complete conical shielding cover 100 shell. When the shielding cover 100 needs to be folded, the two movable arc-shaped shells 101 inside and outside are driven by their respective power sources 203 to move in the opposite direction, so that the three arc-shaped shells 101 overlap.

[0040] Designing the shielding cover 100 as a conical shell has the following advantages: Structural stability: The conical shape has natural geometric stability, can evenly disperse external pressure, and enhance the overall strength of the shielding cover 100. Electromagnetic shielding effect: The conical shape helps to guide and reflect electromagnetic waves more effectively, reduce the penetration of electromagnetic waves, and thus improve the shielding effectiveness. Space utilization: The conical design makes full use of the internal space of the shielding cover 100, providing sufficient protection space for internal equipment while keeping the external dimensions compact. Rapid deployment: Through the rapid unfolding and folding of the movable arc shell 101, the shielding cover 100 can be quickly deployed in place, improving the efficiency of the test. Easy maintenance: The block design makes the maintenance and replacement of the shielding cover 100 more convenient, and the maintenance or replacement of a single arc shell 101 will not affect the use of the entire shielding cover 100. In summary, the design of the conical shell not only improves the practicality and functionality of the shielding cover 100, but also enhances its structural stability and electromagnetic shielding effect, making the shielding device more efficient and reliable.

[0041] When using the shielding device for partial discharge test of transformers with voltage levels of 35KV and below, first, by pressing the wireless remote control switch, the driving motor 203d starts to operate, and the motor 203d drives the belt 203a to rotate, so that the two movable arc-shaped shells 101 move under the guidance of their respective tracks 202, so as to achieve the purpose of rotating and opening the shielding cover 100, and then the dry-type transformer sample is placed in the shielding cover 100, and the position of the dry-type transformer sample is fixed by bolts; then, one end of the conductive copper wire 102 is connected to the dry-type current transformer sample, and the motor 203d is controlled to reverse and close the shielding cover 100, and then the partial discharge test of the voltage transformer can be carried out.

[0042] The remaining structures are the same as those of Example 1.

[0043] Example 3

[0044] Reference Figure 2-Figure 5, which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: the matching part of the shielding cover 100, that is, the moving part 200, is specifically described in design: the base 201 includes an annular bracket 201a and a plurality of universal wheels 201b installed at the bottom of the annular bracket 201a, and the bottom of one of the arc-shaped shells 101 is installed on the upper surface of the annular bracket 201a. The track 202 includes two guide rails 202a, both of which are arranged in a large semicircular ring shape. The two guide rails 202a are arranged alternately, and one end of each guide rail 202a is located on the same straight line. An arc-shaped shell 101 is slidably arranged on each guide rail 202a. The arc-shaped shell 101 is arranged in three pieces, each of which is provided with a copper wire 102 for grounding. One of the pieces is fixed and the other two pieces slide along their respective guide rails 202a through the guide wheels 101a arranged at the bottom. There are two groups of power sources 203, corresponding to the two guide rails 202a respectively. The power source 203 is arranged in the form of a belt 203a and is connected to the two movable arc-shaped shells 101.

[0045] It should be explained that the base 201 of the shielding device is designed to include an annular bracket 201a, which is the basic structure of the entire shielding device, and a plurality of universal wheels 201b are installed at the bottom thereof, which provide the device with flexibility and mobility on a plane, so that the shielding device can be easily adjusted in position as needed. An arc-shaped shell 101 is fixed on the upper surface of the annular bracket 201a, and the arc-shaped shell 101 is a part of the shielding device, and works together with the other two arc-shaped shells 101 to form a complete shielding structure.

[0046] The track 202 of the shielding device is composed of two large semicircular guide rails 202a, which are staggered and one end is located on the same straight line. This layout allows the two movable arc shells 101 to overlap on one side when unfolding to form a conical shell, forming a complete and sealed conical shell. An arc shell 101 is slidably arranged on each guide rail 202a, one of which is fixed and the other two are movable. These movable arc shells 101 slide along their respective guide rails 202a through the bottom bracket, which is provided with guide wheels 101a, to achieve the unfolding and folding of the shielding cover 100. In order to drive the movement of the arc shell 101, the device is equipped with two sets of power sources 203, which are connected to the movable arc shell 101 in the form of belts 203a. The sliding of the arc shell 101 is achieved through the traction of the belts 203a, thereby controlling the opening and closing of the shielding cover 100. Each arc-shaped housing 101 is grounded via a copper wire 102 to ensure effective shielding of electromagnetic interference and operational safety.

[0047] The key components and their functions included in the power source 203 are as follows:

[0048] Belt 203a: Belt 203a is a flexible transmission belt, one end of which is mounted on the driving wheel 203c of the motor 203d, and the other end is mounted on the tensioning wheel 203b. The main function of belt 203a is to transmit the power generated by the motor 203d, push the shielding cover 100 to complete the opening and closing actions, and realize the automatic operation of the shielding cover 100.

[0049] Tensioning wheel 203b: installed at one end of the guide rail 202a, its main function is to adjust the tension of the belt 203a sleeved thereon. By adjusting the tension of the belt 203a, the tensioning wheel 203b ensures that the belt 203a remains tight during the operation of the device and avoids loosening, thereby ensuring that the arc-shaped housing 101 can move smoothly.

[0050] Stopper 203h: It is installed on the guide rail 202a and matches the switch position of the shielding cover 100. The function of the stopper 203h is to limit the opening and closing positions of the shielding cover 100, prevent the device from exceeding the preset opening and closing range during operation, and ensure the safety of operation.

[0051] Bending piece 203e: It is installed on the guide rail 202a and is used to adjust the bending angle of the belt 203a. When the shielding cover 100 is opened or closed, the bending piece 203e of the belt 203a adjusts the bending angle of the belt 203a to ensure that the arc-shaped shell 101 can move smoothly, while reducing the friction between the belt 203a and the guide rail 202a to improve the operating efficiency.

[0052] Belt clamp 203f: This is a clamping device used to connect the belt 203a with the movable arc-shaped housing 101. The function of the belt clamp 203f is to transmit power, ensure that the belt 203a drives the arc-shaped housing 101 to move during operation, and maintain the stability of power transmission.

[0053] The controller 203g is the brain of the shielding device, responsible for receiving instructions from the wireless remote control switch and adjusting the operation of the motor 203d accordingly. It not only performs simple on-off control, but also more complex speed and direction control. The controller 203g is electrically connected to the motor 203d through wires or circuits, directly sending control signals such as start, stop and speed adjustment. In addition, the controller 203g has built-in safety logic, such as overload protection and limit switch monitoring, to ensure the safe operation of the device.

[0054] The wireless remote control switch allows the operator to wirelessly control the motor 203d within a certain distance to remotely open and close the shielding cover 100. This wireless control method is based on infrared, radio waves or other wireless technologies, providing convenience of operation, which is particularly important when physical contact needs to be avoided or when operating in a dangerous environment.

[0055] The motor 203d not only provides power in the system, but also may integrate electronic control functions such as speed control and direction control. The motor 203d is connected to the controller 203g and the belt 203a, and the power is transmitted to the shielding cover 100 through the belt 203a to realize its switching action. This driving effect of the motor 203d is the key to the automatic operation of the shielding device, which enables the operator to quickly and conveniently control the shielding cover 100, thereby improving the efficiency and safety of the operation.

[0056] These components work together to ensure that the shielding device can operate safely, smoothly and efficiently. The tensioning wheel 203b and the belt 203a clamp ensure the stable operation of the belt 203a, the stopper 203h ensures the safety of operation, and the belt 203a bending piece 203e improves the stability and efficiency of the device movement. As the key to power transmission, the belt 203a effectively transmits the power of the motor 203d to the shielding cover 100 to achieve the movement of the shielding cover 100. The motor 203d, the controller 203g and the wireless remote control switch constitute the control chain of the shielding device. The three work together to ensure that the shielding device can complete the automated operation safely and accurately.

[0057] The remaining structure is the same as that of Example 2.

[0058] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only several embodiments are described in detail in this disclosure, it should be easily understood by the personnel referring to this disclosure that many modifications are possible (for example, the size, scale, structure, shape and ratio of various elements, and parameter values ​​(for example, temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of a plurality of parts or elements, the position of the element can be inverted or otherwise changed, and the property or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method step can be changed or reordered according to alternative embodiments. Therefore, the present invention is not limited to specific embodiments, but extends to a variety of modifications still falling within the scope of the appended claims.

[0059] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0060] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A shielding device for partial discharge test of transformers with voltage levels of 35KV and below, characterized in that: The invention comprises a grounded shielding cover (100) and a moving part (200) for controlling the folding, stowing or unfolding of the shielding cover (100), wherein the shielding cover (100) as a whole is a conical shell composed of a plurality of arc-shaped shells (101), and the plurality of arc-shaped shells (101) are arranged in a staggered manner; the moving part (200) comprises a base (201) and a track (202) installed on the base (201), a power source (203) is arranged in the track (202), and the power source (203) drives the arc-shaped shell (101) to move along the track (202), and the track (202) guides and limits the movement of the arc-shaped shell (101).

2. The shielding device for partial discharge test of transformers with voltage levels of 35KV and below according to claim 1 is characterized in that: The shielding cover (100) is made of a high-conductivity material and is grounded via a copper wire (102).

3. The shielding device for partial discharge test of transformer with voltage level of 35KV and below according to claim 1 is characterized in that: The base (201) comprises an annular support (201a) and a plurality of universal wheels (201b) mounted on the bottom of the annular support (201a), wherein the bottom of one of the arc-shaped shells (101) is mounted on the upper surface of the annular support (201a).

4. The shielding device for partial discharge test of transformers with voltage levels of 35KV and below according to claim 3 is characterized in that: The track (202) comprises two guide rails (202a), both of which are arranged in a large semicircular ring shape. The two guide rails (202a) are arranged in a staggered manner, and one end thereof is located on the same straight line. An arc-shaped shell (101) is slidably arranged on each guide rail (202a).

5. The shielding device for partial discharge test of transformer with voltage level of 35KV and below according to claim 4 is characterized in that: The arc-shaped housing (101) is provided in three pieces, one of which is fixed, and the other two pieces slide along the respective guide rails (202a) via guide wheels (101a) provided at the bottom.

6. The shielding device for partial discharge test of transformers with voltage levels of 35KV and below according to claim 4 or 5, characterized in that: The power source (203) is provided with two groups, corresponding to the two guide rails (202a) respectively. The power source (203) is provided in the form of a belt and is connected to the two movable arc-shaped shells (101).

7. The shielding device for partial discharge test of transformer with voltage level of 35KV and below according to claim 6 is characterized in that: The power source (203) comprises a belt (203a), and a tensioning wheel (203b) and a driving wheel (203c) installed at both ends of the belt (203a), and the driving wheel (203c) is connected to a motor (203d).

8. The shielding device for partial discharge test of transformers with voltage levels of 35KV and below according to claim 7 is characterized in that: A bending piece (203e) for adjusting the angle of the belt (203a) is also provided in the guide rail (202a).

9. The shielding device for partial discharge test of transformers with voltage levels of 35KV and below according to claim 7 is characterized in that: The belt (203a) is also provided with a belt clamp (203f), which is clamped on the belt (203a) and has one end mounted on the bottom of the movable arc-shaped housing (101).

10. The shielding device for partial discharge test of transformers with voltage levels of 35KV and below according to claim 7 is characterized in that: The motor (203d) is also electrically connected to a controller (203g), and the controller (203g) is wirelessly connected to an external wireless remote control switch for controlling the motor (203d).

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