A transformer testing device

Abstract

This invention discloses a transformer testing device, whose switching mechanism includes: three busbar assemblies for electrical connection to the three-phase bushing terminals of the transformer; two sliding contact assemblies, each comprising multiple slidingly engaged slider contacts spaced apart, with each busbar assembly connected and disconnected via the sliding contact assemblies; and a pushing device for driving the slider contacts of the sliding contact assemblies to move, thereby electrically connecting or disconnecting the slider contacts. Operators can quickly connect and disconnect the transformer terminals by controlling the pushing device. The device is simple in structure and easy to operate. Furthermore, when the switching mechanism is in the closed state, the contact is achieved through the contact of the slider contacts. Compared to a disconnector, the contact between the slider contacts is surface contact, which is more reliable, has a larger contact area, and eliminates the shearing force experienced during disconnection and opening of a disconnector, thus solving the problem of contact surface wear.

Description

Technical Field

[0001] This invention relates to the field of transformer temperature rise testing technology, and in particular to a transformer testing device. Background Technology

[0002] In temperature rise tests of liquid-immersed transformers, it is usually necessary to short-circuit the low-voltage side terminals of the transformer. When measuring the winding temperature rise, the winding resistance needs to be measured quickly after the power is disconnected, and then the average winding temperature is derived from the resistance. Resistance measurement should be performed as soon as possible after the winding is connected to the measuring device. National standard GB / T1094.2 recommends that the time from power disconnection to the measurement of the first effective thermal resistance should not exceed: 2 minutes for transformers with a rated capacity of less than 100MVA; 3 minutes for transformers with a rated capacity of not less than 100MVA and less than 500MVA; and 4 minutes for transformers with a rated capacity of not less than 500MVA.

[0003] In existing technologies, transformer terminal short-circuit connections often employ fasteners. This involves connecting the copper busbars to the low-voltage side terminals of the transformer using fasteners. Because fasteners are required to achieve the short circuit, removal or installation takes considerable time. To quickly achieve short-circuit and open-circuit connections, another existing technology uses disconnect switches to achieve transformer terminal short-circuit connections. Disconnect switches are added to the lines shorting each low-voltage side terminal, enabling the opening and closing of the short circuit. However, the contact surfaces of disconnect switches are typically line contacts, which are prone to wear during opening and closing, reducing their reliability.

[0004] Therefore, how to reduce wear on the contact surface and improve the reliability of switching on and off while achieving rapid switching between transformer terminals is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a transformer testing device that can reduce wear on the contact surface and improve the reliability of the switching on and off while achieving rapid switching between transformer terminals.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A transformer testing device includes a switching device, the switching device comprising:

[0008] The busbar assembly consists of three sections, each electrically connected to one of the three phase bushing terminals of the transformer.

[0009] There are two sliding contact assemblies, each comprising a plurality of relatively slidingly engaged slider contacts, the slider contacts being arranged at intervals. The first and second busbar assemblies are electrically connected to different slider contacts of one of the sliding contact assemblies, and the second and third busbar assemblies are electrically connected to different slider contacts of the other sliding contact assembly.

[0010] A pushing device is used to drive the slider contacts of the sliding contact assembly to move so that each of the slider contacts is electrically connected or disconnected.

[0011] Optionally, in the above-mentioned transformer testing apparatus, the busbar assembly includes:

[0012] Copper busbar support device;

[0013] There are multiple busbars, each of which is spaced apart on the busbar support device by a corresponding insulating bracket, and at least two of the busbars are electrically connected to two different slider contacts of the sliding contact assembly.

[0014] Optionally, in the above-described transformer testing apparatus, one or more of the busbars of the busbar assembly are electrically connected to one of the slider contacts of the sliding contact assembly.

[0015] Optionally, in the above-mentioned transformer testing apparatus, the driving device includes:

[0016] Drive unit;

[0017] A lifting mechanism is provided, wherein the driving device is used to drive the lifting mechanism to perform lifting and lowering actions, and the slider contacts of the sliding contact assembly are arranged at intervals along the height direction. When the lifting mechanism performs lifting and lowering actions, it pushes the slider contacts to achieve electrical connection or disconnection.

[0018] Optionally, in the above-mentioned transformer testing device, the sliding contact assembly further includes a first elastic element, which is disposed between the lifting mechanism and the lowermost slider contact of the sliding contact assembly.

[0019] Optionally, in the above-mentioned transformer testing device, the sliding contact assembly further includes a sliding guide rod, each of the slider contacts is slidably fitted on the sliding guide rod, and the sliding guide rod is provided with a limiting member for limiting the lower limit position of the upper slider contact. The upper slider contact is the other slider contacts except for the slider contact located at the lowest side.

[0020] Optionally, in the above-mentioned transformer testing device, the sliding contact assembly further includes a second elastic element sleeved on the sliding guide rod and located below the uppermost slider contact.

[0021] Optionally, in the above-mentioned transformer testing device, the lifting mechanism is a lead screw mechanism or a gear and rack mechanism, the driving device is a drive motor, and the driving device drives the rotating part of the lifting mechanism to rotate through the transmission mechanism, and the moving part of the lifting mechanism performs lifting and lowering actions.

[0022] Optionally, in the above-mentioned transformer testing device, the busbar assembly includes four busbars, and the sliding contact assembly includes five sliding contacts;

[0023] The two upper busbars of the first busbar assembly are electrically connected to the second slider contact of the first sliding contact assembly from top to bottom, and the two lower busbars of the first busbar assembly are electrically connected to the fourth slider contact of the first sliding contact assembly from top to bottom.

[0024] The uppermost busbar of the second busbar assembly is electrically connected to the first slider contact of the two sliding contact assemblies from top to bottom. The two busbars in the middle of the second busbar assembly are electrically connected to the third slider contact of the two sliding contact assemblies from top to bottom. The lowermost busbar of the second busbar assembly is electrically connected to the fifth slider contact of the two sliding contact assemblies from top to bottom.

[0025] The two upper busbars of the third busbar assembly are electrically connected to the second slider contact of the second sliding contact assembly from top to bottom, and the two lower busbars of the third busbar assembly are electrically connected to the fourth slider contact of the second sliding contact assembly from top to bottom.

[0026] Optionally, in the above-mentioned transformer testing device, the switching device further includes a base, and the busbar assembly, the sliding contact assembly and the pushing device are all disposed on the base.

[0027] Optionally, the above-mentioned transformer testing apparatus further includes a mobile lifting platform, which comprises:

[0028] The chassis has wheels at the bottom.

[0029] A scissor linkage mechanism is installed on the walking chassis, and a lifting platform is provided on the upper part of the scissor linkage mechanism, with the base installed on the lifting platform;

[0030] The lifting hydraulic cylinder is used to drive the scissor linkage mechanism to move the lifting platform to perform lifting actions.

[0031] Optionally, in the above-mentioned transformer testing device, the traveling chassis is provided with support feet.

[0032] Optionally, in the above-mentioned transformer testing device, the mobile lifting platform further includes a tensioning wire rope, one end of which is connected to the traveling chassis or the supporting foot, and the other end is connected to the lifting platform.

[0033] The transformer testing device provided by this invention electrically connects the three phase bushing terminals of the transformer to three busbar assemblies. The first and second busbar assemblies are electrically connected by moving the slider contact of one sliding contact assembly, and the second and third busbar assemblies are electrically connected by moving the slider contact of the other sliding contact assembly. This achieves electrical connection of the three busbar assemblies, effectively short-circuiting the three phase bushing terminals of the transformer. In this state, the switching device is closed. After the transformer fluid temperature stabilizes, the temperature rise of the top layer of the transformer fluid can be measured.

[0034] When it is necessary to measure the temperature rise of the transformer winding, the sliding contact of the two sliding contact assemblies is moved by the pushing device so that the sliding contact is disconnected, which means that the three-phase bushing terminals of the transformer are disconnected. In this state, the opening and closing device is in the open state. At this time, the winding is connected to the measuring device for resistance measurement, which can measure the temperature rise of the transformer winding.

[0035] The transformer testing device provided by this invention allows operators to quickly connect and disconnect transformer terminals by controlling the push device, achieving a rapid switching effect. It also features a simple structure and convenient operation. Furthermore, when the device is in the closed state, the contact is achieved through the sliding contactor. Compared to a knife switch, the contact between the sliding contacts is surface contact, which is more reliable, has a larger contact area, and eliminates the shearing force experienced during knife switch operation, thus solving the problem of contact surface wear. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1This is a schematic diagram of the structure of the transformer testing device disclosed in an embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the opening and closing device disclosed in an embodiment of the present invention;

[0039] Figure 3 This is a top view of the opening and closing device disclosed in an embodiment of the present invention;

[0040] Figure 4 This is a side view of the opening and closing device disclosed in an embodiment of the present invention;

[0041] Figure 5 This is a front view of the mobile lifting platform disclosed in an embodiment of the present invention;

[0042] Figure 6 This is a side view of the mobile lifting platform disclosed in an embodiment of the present invention.

[0043] The meanings of the various reference numerals in the figure are as follows:

[0044] 100 is the opening and closing device, 110 is the base, 120 is the busbar assembly, 121 is the busbar, 122 is the busbar support device, 130 is the sliding contact assembly, 131 is the first elastic element, 132 is the slider contact, 133 is the sliding guide rod, 134 is the second elastic element, 135 is the sliding bearing, 140 is the flexible connection wire, 150 is the pushing device, 151 is the driving device, 152 is the transmission mechanism, and 153 is the lifting mechanism.

[0045] 200 is a mobile lifting platform, 201 is a scissor linkage mechanism, 202 is a tensioning wire rope, 203 is a lifting hydraulic cylinder, 204 is a walking chassis, 205 is a walking wheel, 206 is a lifting platform, and 207 is a support foot. Detailed Implementation

[0046] The core of this invention lies in providing a transformer testing device that can reduce wear on the contact surface and improve the reliability of opening and closing while achieving rapid opening and closing between transformer terminals;

[0047] Another core aspect of this invention is to provide a massage chair with the aforementioned transformer testing device.

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] like Figures 1-4As shown in the figure, an embodiment of the present invention discloses a transformer testing device for assisting in relevant temperature rise tests of transformers, such as assisting in measuring the temperature rise of the liquid top layer of the transformer and the temperature rise of the transformer windings.

[0050] The transformer testing device includes a switching device 100 for quickly connecting or disconnecting the three-phase bushing terminals of the transformer. The switching device 100 includes a busbar assembly 120, a sliding contact assembly 130, and a pushing device 150.

[0051] The busbar assembly 120 corresponds to three 3-phase bushing terminals of the transformer. The three busbar assemblies 120 are electrically connected to the 3-phase bushing terminals of the transformer respectively. The electrical connection of the 3-phase bushing terminals can be achieved by electrically connecting the three busbar assemblies 120, and the disconnection of the 3-phase bushing terminals can be achieved by disconnecting the three busbar assemblies 120.

[0052] Two sliding contact assemblies 130 are provided. Each sliding contact assembly 130 includes multiple sliding contact 132 that are relatively slidably engaged. The sliding contact 132 is arranged at intervals, that is, in the natural state, each sliding contact 132 remains electrically disconnected.

[0053] Each sliding contact assembly 130 is used to electrically connect two of the busbar assemblies 120, thereby enabling the electrical connection of three busbar assemblies 120. Specifically, the first and second busbar assemblies 120 are electrically connected to different slider contacts 132 of one of the sliding contact assemblies 130, and the second and third busbar assemblies 120 are electrically connected to different slider contacts 132 of the other sliding contact assembly 130.

[0054] For ease of understanding, the three busbar assemblies 120 are respectively defined as the first busbar assembly, the second busbar assembly, and the third busbar assembly. The two sliding contact assemblies 130 are respectively defined as the first sliding contact assembly and the second sliding contact assembly.

[0055] The electrical relationships of the three busbar assemblies 120 and the two sliding contact assemblies 130 disclosed in the above embodiments are as follows.

[0056] The first busbar assembly is electrically connected to one or more slider contacts 132 of the first sliding contact assembly, and the second busbar assembly is electrically connected to another or more slider contacts 132 of the first sliding contact assembly. By controlling the contact and disconnection of the slider contacts 132 of the first sliding contact assembly, the electrical connection and disconnection of the first busbar assembly and the second busbar assembly are achieved.

[0057] The second busbar assembly is electrically connected to one or more slider contacts 132 of the second sliding contact assembly, and the third busbar assembly is electrically connected to another or more slider contacts 132 of the second sliding contact assembly. By controlling the contact and disconnection of the slider contacts 132 of the second sliding contact assembly, the electrical connection and disconnection of the second and third busbar assemblies are achieved.

[0058] The pushing device 150 is used to drive the slider contact 132 of the sliding contact assembly 130 to move, so that the slider contacts 132 are electrically connected or disconnected. Those skilled in the art will understand that driving devices capable of moving the slider contacts 132 are common in the prior art, such as cylinders, hydraulic cylinders, lead screw mechanisms, gear and rack mechanisms, linear motors, etc. This embodiment of the invention does not limit the specific structure of the pushing device 150, as long as it can perform the above actions.

[0059] In summary, the transformer testing device provided by this invention electrically connects the three phase bushing terminals of the transformer to three busbar assemblies 120 respectively. The first and second busbar assemblies 120 are electrically connected by the movement of the slider contact 132 of one sliding contact assembly 130, and the second and third busbar assemblies 120 are electrically connected by the movement of the slider contact 132 of another sliding contact assembly 130. Thus, the electrical connection of the three busbar assemblies 120 can be achieved, which means that the three phase bushing terminals of the transformer are short-circuited. In this state, the switching device is in the closed state. After the transformer liquid temperature stabilizes, the temperature rise of the top layer of the transformer liquid can be measured.

[0060] When it is necessary to measure the temperature rise of the transformer winding, the sliding contact 132 of the two sliding contact assemblies 130 is moved by the pushing device 150 so that each sliding contact 132 is disconnected, which means that the three-phase bushing terminals of the transformer are disconnected. In this state, the opening and closing device is in the open state. At this time, the winding is connected to the measuring device for resistance measurement, which can measure the temperature rise of the transformer winding.

[0061] The transformer testing device provided by this invention allows operators to quickly connect and disconnect transformer terminals by controlling the push device, achieving a rapid switching effect. It also features a simple structure and convenient operation. Furthermore, when the closing device is in the closed state, it achieves this through the contact of the slider contact 132. Compared to a knife switch, the contact between the slider contacts 132 is a surface contact, which is more reliable, has a larger contact area, and eliminates the shearing force experienced during the opening and closing of a knife switch, thus solving the problem of contact surface wear.

[0062] There is a close relationship between the size of the copper busbar and the current. Its current-carrying capacity mainly depends on its cross-sectional area; the larger the current, the larger the cross-sectional area is required to ensure it can withstand the current without overheating. Similarly, the larger the cross-sectional area of ​​the copper busbar, the larger the current it can carry. Different transformers have different rated currents. For transformers with high rated currents, the busbar assembly 120 needs to have a thicker copper busbar during testing, while for transformers with low rated currents, a thicker copper busbar is not necessary. How to adjust the cross-sectional area of ​​the busbar according to the rated current has become a technical problem that urgently needs to be solved by those skilled in the art.

[0063] Based on this, such as Figures 2-4 As shown, in a specific embodiment of the present invention, the busbar assembly 120 includes a busbar support device 122 and a busbar 121. The busbar support device 122 is used to provide an installation foundation for the busbar 121.

[0064] Multiple busbars 121 are provided, each busbar 121 being spaced apart on a busbar support device 122 via corresponding insulating supports. The insulating supports are then fixed to their respective insulating supports. At least two busbars 121 are electrically connected to two different slider contacts 132 of the sliding contact assembly 130. Because the slider contacts 132 connected to at least two busbars 121 are different, the number of slider contacts 132 electrically connected can be selected according to the transformer's rated current. This not only achieves electrical connection between the two busbar assemblies 120 but also controls the number of busbars 121 involved in the electrical connection. In this embodiment, one or more sets of busbars 121 can be used based on the transformer's rated current.

[0065] It should be noted that one busbar 121 of the busbar assembly 120 can be electrically connected to one slider contact 132 of the sliding contact assembly 130, or multiple busbars 121 of the busbar assembly 120 can be electrically connected to one slider contact 132 of the sliding contact assembly 130.

[0066] In a specific embodiment of the present invention, the busbar assembly 120 includes four busbars 121, and the sliding contact assembly 130 includes five slider contacts 132. For ease of understanding, the four busbars 121 of the busbar assembly 120 are, from top to bottom, a first busbar, a second busbar, a third busbar, and a fourth busbar. The five slider contacts 132 of the sliding contact assembly 130 are, from top to bottom, a first slider contact, a second slider contact, a third slider contact, a fourth slider contact, and a fifth slider contact.

[0067] The two upper busbars 121 (i.e., the first busbar and the second busbar) of the first busbar assembly 120 are electrically connected to the second slider contact 132 (i.e., the second slider contact) of the first sliding contact assembly 130 from top to bottom. The two lower busbars 121 (i.e., the third busbar and the fourth busbar) of the first busbar assembly 120 are electrically connected to the fourth slider contact 132 (i.e., the fourth slider contact) of the first sliding contact assembly 130 from top to bottom.

[0068] The uppermost busbar 121 (i.e., the first busbar) of the second busbar assembly 120 is electrically connected to the first slider contact 132 (i.e., the first slider contact) of the two sliding contact assemblies 130 from top to bottom. The two busbars 121 in the middle of the second busbar assembly 120 (i.e., the second and third busbars) are electrically connected to the third slider contact 132 (i.e., the third slider contact) of the two sliding contact assemblies 130 from top to bottom. The lowermost busbar 121 (i.e., the fourth busbar) of the second busbar assembly 120 is electrically connected to the fifth slider contact 132 (i.e., the fifth slider contact) of the two sliding contact assemblies 130 from top to bottom.

[0069] The two upper busbars 121 (i.e., the first busbar and the second busbar) of the third busbar assembly 120 are electrically connected to the second slider contact 132 (i.e., the second slider contact) of the second sliding contact assembly 130 from top to bottom. The two lower busbars 121 (i.e., the third busbar and the fourth busbar) of the third busbar assembly 120 are electrically connected to the fourth slider contact 132 (i.e., the fourth slider contact) of the second sliding contact assembly 130 from top to bottom.

[0070] In this embodiment, the sliding contact 132 (i.e., the fifth sliding contact) at the bottom of the sliding contact assembly 130 is pushed by the pushing device 150, causing the fifth sliding contact to slide upward and contact the fourth sliding contact. This makes the third and fourth busbars of the first busbar assembly 120 electrically connected to the fourth busbar of the second busbar assembly 120 and the third and fourth busbars of the third busbar assembly 120. The operator can choose this method to conduct the test according to the rated current of the transformer to be tested.

[0071] It should be noted that the electrical connection between the busbar assembly 120 and the sliding contact assembly 130 can be achieved through the flexible connecting wire 140.

[0072] The pushing device 150 pushes the lowermost slider contact 132 (i.e., the fifth slider contact) of the sliding contact assembly 130, causing the fifth slider contact to slide upward and contact the fourth slider contact and the third slider contact. This then electrically connects the third and fourth busbars of the first busbar assembly 120 with the second, third, and fourth busbars of the second busbar assembly 120 and the third and fourth busbars of the third busbar assembly 120. The operator can select this method to conduct the test according to the rated current of the transformer to be tested.

[0073] The pushing device 150 pushes the lowermost slider contact 132 (i.e., the fifth slider contact) of the sliding contact assembly 130, causing the fifth slider contact to slide upward and contact the fourth slider contact, the third slider contact, and the second slider contact. This causes all the busbars of the first busbar assembly 120 to be electrically connected to the second busbar, the third busbar, the fourth busbar of the second busbar assembly 120, and all the busbars of the third busbar assembly 120. The operator can choose this method to conduct the test according to the rated current of the transformer to be tested.

[0074] The pushing device 150 pushes the lowermost slider contact 132 (i.e., the fifth slider contact) of the sliding contact assembly 130, causing the fifth slider contact to slide upward and make contact with the fourth slider contact, the third slider contact, the second slider contact, and the first slider contact. This then electrically connects all the busbars of the first busbar assembly 120 with all the busbars of the second busbar assembly 120 and all the busbars of the third busbar assembly 120. The operator can choose this method to conduct the test according to the rated current of the transformer to be tested.

[0075] It should be noted that the busbar assembly 120 includes four busbars 121, and the sliding contact assembly 130 includes five slider contacts 132. This is merely an example for ease of understanding; the actual number of busbars 121 and slider contacts 132 can be selected by those skilled in the art according to their needs. The first slider contact of the sliding contact assembly 130, since it does not need to move, can be designed to be in a fixed state, while the other slider contacts 132 are designed to be in a sliding state.

[0076] like Figure 2As shown, in a specific embodiment of the present invention, the pushing device 150 includes a driving device 151 and a lifting mechanism 153. The driving device 151 is used to drive the lifting mechanism 153 to perform lifting and lowering actions. The slider contacts 132 of the sliding contact assembly 130 are arranged at intervals along the height direction. When the lifting mechanism 153 performs lifting and lowering actions, it pushes the slider contacts 132 to achieve electrical connection or disconnection. The driving device 151 is used to provide power to the lifting mechanism 153. Each sliding contact assembly 130 can be equipped with a driving device 150, or two sliding contact assemblies 130 can be equipped with the same driving device 151 and each can be equipped with a lifting mechanism 153, with one driving device 151 providing power to both lifting mechanisms 153.

[0077] To maintain the clamping force between the slider contacts 132, the slider contact assembly 130 also includes a first elastic element 131, which is disposed between the lifting mechanism 153 and the lowermost slider contact 132 of the slider contact assembly 130. The first elastic element 131 can be an elastic element such as a compression spring. Due to the action of the first elastic element 131, the slider contacts 132 are strongly pressed together to form a reliable electrical connection.

[0078] The lifting mechanism 153 can be a lead screw mechanism or a rack and pinion mechanism, and the drive device 151 can be a drive motor. The drive device 151 drives the rotating part of the lifting mechanism 153 to rotate through the transmission mechanism 152, and the moving part of the lifting mechanism 153 performs lifting and lowering actions. The transmission mechanism 152 can be a gear mechanism, etc. When the lifting mechanism 153 is a lead screw mechanism, the rotating part of the lifting mechanism 153 is a lead screw nut, and the moving part of the lifting mechanism 153 is a lead screw; when the lifting mechanism 153 is a rack and pinion mechanism, the rotating part of the lifting mechanism 153 is a gear, and the moving part of the lifting mechanism 153 is a rack.

[0079] To ensure the sliding direction of the slider contact 132, in this embodiment, the slider contact assembly 130 further includes a sliding guide rod 133. Each slider contact 132 is slidably engaged with the sliding guide rod 133, specifically through a sliding bearing 135, so that each slider contact 132 slides along the extension direction of the sliding guide rod 133. The sliding guide rod 133 is provided with a limiting member to restrict the lower limit position of the upper slider contact. The upper slider contact refers to all slider contacts 132 except the lowermost slider contact 132. If the uppermost slider contact 132 is fixed to the sliding guide rod 133, then the upper slider contact does not include the uppermost slider contact 132; that is, the upper slider contact only applies to slider contacts 132 that can slide along the sliding guide rod 133. Under the action of the limiting component, as the lifting mechanism 153 descends, the slider contact 132 that slides along the sliding guide rod 133 also descends. When it is stopped by the limiting component, the descent stops, thus avoiding the problem that the slider contacts 132 cannot disconnect during the descent.

[0080] Furthermore, the sliding contact assembly 130 also includes a second elastic element 134 sleeved on the sliding guide rod 133 and located below the uppermost slider contact 132. When the slider contact 132 slides down, the elastic force of the second elastic element 134 ensures more reliable separation of the slider contact 132, preventing excessive lifting and clamping force from causing adhesion between the slider contacts 132 and hindering effective disconnection. The action of the second elastic element 134 increases the reliability of the transformer testing device.

[0081] The opening and closing device 100 also includes a base 110, on which the busbar assembly 120, the sliding contact assembly 130, and the pushing device 150 are all mounted. The busbar 121 of the busbar assembly 120 and the slider contact 132 of the sliding contact assembly 130 are at a preset distance from the base 110, which can be set according to requirements.

[0082] Because the transformer bushing is positioned high, in order to facilitate wiring with the transformer bushing terminals, in this embodiment, the transformer testing device may also include a movable lifting platform 200, such as... Figure 5 and Figure 6 As shown, the mobile lifting platform 200 includes a chassis 204, a scissor linkage mechanism 201, and a lifting hydraulic cylinder 203. The chassis 204 has wheels 205 at its bottom, allowing the mobile lifting platform 200 to move freely.

[0083] A scissor linkage mechanism 201 is mounted on a traveling chassis 204. A lifting platform 206 is mounted on top of the scissor linkage mechanism 201, and a base 110 is mounted on the lifting platform 206. A lifting hydraulic cylinder 203 drives the scissor linkage mechanism 201 to move the lifting platform 206 in a lifting motion. Figure 5 In the figure, 'a' represents the position of the lifting platform 206 after it has been lowered. The mobile lifting platform 200 is usually made of metal. Since the busbar 121 of the busbar assembly 120 and the slider contact 132 of the sliding contact assembly 130 are at a preset distance from the base 110, the busbar 121 of the busbar assembly 120 and the slider contact 132 of the sliding contact assembly 130 are at a certain distance from the mobile lifting platform 200, which reduces the impact of high current leakage flux on the metal frame.

[0084] To improve stability during the test, the chassis 204 is equipped with support feet 207. During the test, the support feet 207 support the chassis to the ground, preventing the wheels 205 from moving and affecting the test process.

[0085] To limit the upper limit position of the lifting platform 206 and prevent safety risks caused by excessive height, a tensioning wire rope 202 is also provided in this embodiment. One end of the tensioning wire rope 202 is connected to the traveling chassis 204 or the support foot 207, and the other end is connected to the lifting platform 206. After the lifting platform 206 rises to the point where the tensioning wire rope 202 is tensioned, the tensioning wire rope 202 will limit the lifting platform 206 from rising further. In this embodiment, the upper limit position of the lifting platform 206 is limited by the length of the tensioning wire rope 202. Two tensioning wire ropes 202 can be symmetrically arranged on both sides of the lifting platform 206, so that the tensioned wire ropes 202 can also prevent the lifting platform 206 from twisting.

[0086] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0087] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0088] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0089] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A transformer testing apparatus, characterized in that, Includes a circuit breaker opening and closing device (100), said circuit breaker opening and closing device (100) comprising: The busbar assembly (120) consists of three units, which are electrically connected to the three-phase bushing terminals of the transformer respectively; There are two sliding contact assemblies (130). Each sliding contact assembly (130) includes a plurality of slidingly engaged slider contacts (132). The slider contacts (132) are arranged at intervals. The first busbar assembly (120) and the second busbar assembly (120) are electrically connected to different slider contacts (132) of one of the sliding contact assemblies (130). The second busbar assembly (120) and the third busbar assembly (120) are electrically connected to different slider contacts (132) of the other sliding contact assembly (130). In the natural state, each slider contact (132) remains electrically disconnected. A pushing device (150) is used to drive the slider contacts (132) of the sliding contact assembly (130) to move so that each slider contact (132) is electrically connected or disconnected. The pushing device (150) includes a lifting mechanism (153). Each slider contact (132) of the sliding contact assembly (130) is arranged at intervals along the height direction. When the lifting mechanism (153) performs a lifting action, it pushes each slider contact (132) to achieve electrical connection or disconnection.

2. The transformer testing apparatus according to claim 1, characterized in that, The busbar assembly (120) includes: Copper busbar support device (122); There are multiple busbars (121), each of which is spaced on the busbar support device (122) by a corresponding insulating bracket. At least two of the busbars (121) are electrically connected to two different slider contacts (132) of the sliding contact assembly (130).

3. The transformer testing apparatus according to claim 2, characterized in that, One or more of the busbars (121) of the busbar assembly (120) are electrically connected to one of the slider contacts (132) of the slider contact assembly (130).

4. The transformer testing apparatus according to claim 2, characterized in that, The pushing device (150) includes: A drive device (151) is used to drive the lifting mechanism (153) to perform lifting and lowering actions.

5. The transformer testing apparatus according to claim 4, characterized in that, The sliding contact assembly (130) further includes a first elastic element (131), which is disposed between the lifting mechanism (153) and the lowermost slider contact (132) of the sliding contact assembly (130).

6. The transformer testing apparatus according to claim 5, characterized in that, The sliding contact assembly (130) further includes a sliding guide rod (133), each of the slider contacts (132) is slidably engaged on the sliding guide rod (133), and the sliding guide rod (133) is provided with a limiting member for limiting the lower limit position of the upper slider contact. The upper slider contact is the other slider contacts (132) except for the slider contact (132) located at the lowest side.

7. The transformer testing apparatus according to claim 6, characterized in that, The sliding contact assembly (130) also includes a second elastic element (134) sleeved on the sliding guide rod (133) and located below the uppermost slider contact (132).

8. The transformer testing apparatus according to claim 4, characterized in that, The lifting mechanism (153) is a lead screw mechanism or a gear and rack mechanism, the driving device (151) is a drive motor, the driving device (151) drives the rotating part of the lifting mechanism (153) to rotate through the transmission mechanism (152), and the moving part of the lifting mechanism (153) performs lifting and lowering actions.

9. The transformer testing apparatus according to claim 2, characterized in that, The busbar assembly (120) includes four busbars (121), and the sliding contact assembly (130) includes five sliding contacts (132). The two upper busbars (121) of the first busbar assembly (120) are electrically connected to the second slider contact (132) of the first sliding contact assembly (130) from top to bottom, and the two lower busbars (121) of the first busbar assembly (120) are electrically connected to the fourth slider contact (132) of the first sliding contact assembly (130) from top to bottom. The uppermost busbar (121) of the second busbar assembly (120) is electrically connected to the first slider contact (132) of the two sliding contact assemblies (130) from top to bottom. The two busbars (121) in the middle of the second busbar assembly (120) are electrically connected to the third slider contact (132) of the two sliding contact assemblies (130) from top to bottom. The lowermost busbar (121) of the second busbar assembly (120) is electrically connected to the fifth slider contact (132) of the two sliding contact assemblies (130) from top to bottom. The two upper busbars (121) of the third busbar assembly (120) are electrically connected to the second slider contact (132) of the second sliding contact assembly (130) from top to bottom, and the two lower busbars (121) of the third busbar assembly (120) are electrically connected to the fourth slider contact (132) of the second sliding contact assembly (130) from top to bottom.

10. The transformer testing apparatus according to any one of claims 1-9, characterized in that, The circuit breaker opening and closing device (100) also includes a base (110), on which the busbar assembly (120), the sliding contact assembly (130) and the pushing device (150) are all disposed.

11. The transformer testing apparatus according to claim 10, characterized in that, It also includes a mobile lifting platform (200), which comprises: The chassis (204) has wheels (205) at the bottom. A scissor linkage mechanism (201) is provided on the walking chassis (204), and a lifting platform (206) is provided on the upper part of the scissor linkage mechanism (201). The base (110) is provided on the lifting platform (206). The lifting hydraulic cylinder (203) is used to drive the scissor linkage mechanism (201) to move, so as to drive the lifting platform (206) to perform lifting action.

12. The transformer testing apparatus according to claim 11, characterized in that, The walking chassis (204) is provided with support feet (207).

13. The transformer testing apparatus according to claim 12, characterized in that, The mobile lifting platform (200) also includes a tensioning wire rope (202), one end of which is connected to the walking chassis (204) or the support foot (207), and the other end is connected to the lifting platform (206).

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