Dry-type transformer device

Abstract

The embodiment of the utility model discloses a dry-type transformer device which comprises a dry-type transformer body and a static contact unit, the dry-type transformer body is provided with a moving contact unit corresponding to the static contact unit, the static contact unit comprises a plurality of static contact mechanisms, and the moving contact unit comprises a moving contact mechanism. The moving contact mechanism comprises a bus current-conducting plate, a contact support frame and two duckbilled moving contacts, the two duckbilled moving contacts are oppositely arranged on the bus current-conducting plate, and pressure springs for clamping the two duckbilled moving contacts are arranged between the duckbilled moving contacts and the contact support frame; the static contact mechanism comprises a duckbilled static contact used for being inserted between the two duckbilled moving contacts of the moving contact mechanism. According to the utility model, the dry-type transformer can be quickly separated from a power supply end and a load end and can be quickly moved to a safe position so as to facilitate maintenance, so that the safety of maintenance personnel is ensured essentially, and quick power transmission can be realized by only replacing the dry-type transformer without repairing the dry-type transformer when a fault occurs.

Description

Technical Field

[0001] The utility model relates to the field of electrical equipment, in particular to a dry-type transformer device. Background Art

[0002] Data centers are important facilities in the information industry, requiring highly reliable power supplies and short power recovery times. Traditional information center power transformers use bolted connections on the busbars, making them difficult to disassemble and assemble. Maintenance and overhaul are limited by space, resulting in a small working surface and inconvenient repairs. Furthermore, due to their proximity to the power supply, safety procedures for overhaul are complex, and power outages can last for extended periods. Utility Model Content

[0003] The technical problem to be solved by the embodiments of the present invention is to provide a dry-type transformer device to improve maintenance safety and shorten power outage time.

[0004] In order to solve the above technical problems, an embodiment of the present utility model proposes a dry-type transformer device, including a dry-type transformer body and a stationary contact unit. A moving contact unit corresponding to the stationary contact unit is provided on the dry-type transformer body. The stationary contact unit includes a plurality of stationary contact mechanisms. The moving contact unit includes a plurality of moving contact mechanisms corresponding one to one to the stationary contact mechanisms. The moving contact mechanism includes a busbar conductive plate, a contact support frame and two duckbill moving contacts. The two duckbill moving contacts are relatively arranged on the busbar conductive plate. A pressure spring for clamping the two duckbill moving contacts is provided between the duckbill moving contact and the contact support frame. The static contact mechanism includes a duckbill static contact for inserting between the two duckbill moving contacts of the moving contact mechanism.

[0005] Furthermore, it also includes a withdrawable hydraulic mechanism, which includes a hydraulic push rod assembly and a hydraulic drive assembly for driving the hydraulic push rod assembly. The hydraulic push rod assembly is correspondingly connected to the dry-type transformer body and the stationary contact unit. The hydraulic push rod assembly enables the moving contact unit of the dry-type transformer body to dock or separate with the stationary contact unit.

[0006] Furthermore, the hydraulic push rod assembly includes a support tube, a piston push rod, and a hydraulic cylinder. The piston push rod is correspondingly installed in the hydraulic cylinder. The front end of the piston push rod is connected to the support tube, the hydraulic cylinder is connected to the dry-type transformer body, and the support tube is connected to the stationary contact unit.

[0007] Furthermore, the hydraulic drive assembly includes a main container, a pressure pump, a pressure motor, a crankshaft connecting rod, a main hydraulic cylinder, an oil return pipe, a return pipe, an oil filling pipe, a suction pipe, a Y-type output pipe, a return branch pipe A, a return branch pipe B, a return branch pipe C, an oil filling branch pipe A, and an oil filling branch pipe B. The main container is filled with lubricating fluid, and a main piston is correspondingly provided in the main hydraulic cylinder. The pressure pump sucks the lubricating fluid in the main container through the suction pipe. The Y-type output pipe consists of a main output pipe and two branch output pipes. The pressure pump injects lubricating fluid into one end or the other end of the main hydraulic cylinder through the Y-type output pipe. The pressure motor drives the pressure pump through the crankshaft connecting rod. One end of the main hydraulic cylinder is connected to the main container through the return oil pipe, and one end of the return pipe is connected to the main container through the return pipe. The flow branch pipe A and the return branch pipe B are respectively connected to the two ends of the hydraulic cylinder, the other end of the return pipe is connected to the main container and connected to the other end of the main hydraulic cylinder through the return branch pipe C, one end of the oil filling pipe is connected to the other end of the main hydraulic cylinder, and the other end of the oil filling pipe is respectively connected to the two ends of the hydraulic cylinder through the oil filling branch pipe A and the oil filling branch pipe B. Solenoid valves are provided in the return pipe, return pipe, oil filling pipe, return branch pipe A, return branch pipe B, return branch pipe C, oil filling branch pipe A, oil filling branch pipe B and the two branch output pipes of the Y-shaped output pipe. The hydraulic drive assembly drives the piston push rod of the hydraulic push rod assembly to move by controlling the opening / closing of each solenoid valve, so that the moving contact unit of the dry-type transformer body is connected or separated with the stationary contact unit.

[0008] Furthermore, the hydraulic drive assembly adopts a pulsating pressurization method for pressurization.

[0009] Furthermore, limit switches are correspondingly provided at both ends of the master hydraulic cylinder.

[0010] Furthermore, there are multiple groups of hydraulic push rod assemblies, and the multiple groups of hydraulic push rod assemblies are arranged in parallel.

[0011] Furthermore, the inner surface of the support cylinder is coated with a graphite lubricating layer.

[0012] Furthermore, it also includes a track for facilitating the docking or separation of the dry-type transformer body and the stationary contact unit. The bottom of the dry-type transformer body is provided with a track wheel corresponding to the track, and the dry-type transformer body is correspondingly arranged on the track.

[0013] Furthermore, the stationary contact unit also includes a low-voltage busbar device for outputting voltage and a high-voltage cable terminal for externally connecting high-voltage electricity. The output end of the dry-type transformer body is connected to the low-voltage busbar device through a stationary contact mechanism and a moving contact mechanism, and the input end of the dry-type transformer body is connected to the high-voltage cable terminal through a stationary contact mechanism and a moving contact mechanism.

[0014] The beneficial effects of this utility model are as follows: 1) This utility model allows the dry-type transformer to be quickly disconnected from the power supply and load terminals, quickly moving the dry-type transformer to a safe location for easy maintenance. By removing the transformer from the dangerous end, the safety of maintenance personnel is essentially ensured. 2) Depending on the importance of the information center, the dry-type transformer device of this utility model can also be used as a spare part, allowing for direct and rapid replacement in the event of a fault, ensuring rapid power restoration. Faulty dry-type transformer devices can be directly sent back to the factory for maintenance, achieving replacement without repair and rapid power restoration in the event of a fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural diagram of a dry-type transformer device according to an embodiment of the present utility model.

[0016] Figure 2 This is a schematic structural diagram of the dry-type transformer device according to an embodiment of the present utility model when it is switched on.

[0017] Figure 3 It is a structural schematic diagram of the dry-type transformer device of the embodiment of the utility model when it is disconnected.

[0018] Figure 4 It is a structural schematic diagram of the moving contact unit of an embodiment of the present utility model.

[0019] Figure 5 It is a structural schematic diagram of the main piston of the withdrawable hydraulic mechanism of the embodiment of the utility model when it moves upward for debugging.

[0020] Figure 6 It is a structural schematic diagram of the main piston of the withdrawable hydraulic mechanism of the embodiment of the utility model when it moves downward for debugging.

[0021] Figure 7 It is a structural schematic diagram of the withdrawable hydraulic mechanism of an embodiment of the utility model when hydraulically driven to move left.

[0022] Figure 8 It is a structural schematic diagram of the withdrawable hydraulic mechanism of an embodiment of the utility model when hydraulically driven to move right.

[0023] Figure 9 It is a schematic diagram of flow rate changes of the pressure pump in an embodiment of the utility model.

[0024] Explanation of Figure Numbers

[0025] Dry-type transformer body 10, track 11, track wheel 12, track limiter 13, stationary contact unit 20, duckbill stationary contact 21, low-voltage busbar device 22, high-voltage cable terminal 23, insulating plate 24, moving contact unit 30, busbar conductive plate 31, contact support frame 32, duckbill moving contact 33, pressure spring 34, temperature sensor 35, withdrawable hydraulic mechanism 40, support cylinder 41, 41a, 41b, 41c, 41d, piston push rod 42, Hydraulic cylinders 43, 43a, 43b, 43c, 43d, main container 44, pressure pump 45, pressure motor 46, crankshaft connecting rod 47, main hydraulic cylinder 48, oil return pipe 49, return pipe 50, oil injection pipe 51, suction pipe 52, Y-type output pipe 53, return branch pipe A54, return branch pipe B55, return branch pipe C56, oil injection branch pipe A57, oil injection branch pipe B58, main piston 59, limit switches 3LS1, 3LS2, solenoid valves V1~V10. DETAILED DESCRIPTION

[0026] It should be noted that, unless there is a conflict, the embodiments in this application and the features described in the embodiments can be combined with each other. The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] In the embodiments of the present invention, if there are directional indications (such as up, down, left, right, front, back, etc.), they are only used to explain the relative position relationship and movement status of the various components under a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In addition, in this utility model, the terms "first," "second," etc. 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. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of these features.

[0029] Please refer to Figures 1 to 8 The dry-type transformer device of the present invention includes a dry-type transformer body and a stationary contact unit. The dry-type transformer body is provided with a movable contact unit corresponding to the stationary contact unit (the movable contact unit may be insulated and mounted on the dry-type transformer body via an insulator or the like). The stationary contact unit is used to electrically connect a power supply terminal and a load terminal. The load terminal is the power module of the data center, which supplies power to the data center's power module. The dry-type transformer body is connected to a high-voltage power source, which converts the high-voltage power into a low-voltage power source to supply power to the data center's power module.

[0030] The stationary contact unit includes a number of stationary contact mechanisms, and the moving contact unit includes a number of moving contact mechanisms that correspond one to one with the stationary contact mechanisms. The stationary contact unit also includes a low-voltage busbar device for outputting voltage and a high-voltage cable terminal for externally connecting high-voltage electricity. The output end of the dry-type transformer body is connected to the low-voltage busbar device through the stationary contact mechanism and the moving contact mechanism, and the input end of the dry-type transformer body is connected to the high-voltage cable terminal through the stationary contact mechanism and the moving contact mechanism. Each stationary contact mechanism and each moving contact mechanism of the utility model are divided into two parts, high and low voltage. The stationary contact mechanism and the moving contact mechanism of the high-voltage part are preferably arranged at the top, and the stationary contact mechanism and the moving contact mechanism of the low-voltage part are preferably arranged at the bottom. An insulating plate partition is provided between the high-voltage part and the low-voltage part.

[0031] The moving contact mechanism includes a busbar conductive plate, a contact support frame and two duckbill moving contacts, and the two duckbill moving contacts are arranged opposite to each other on the busbar conductive plate. The contact support frame connects the duckbill moving contacts and transfers the duckbill moving contacts. A pressure spring for clamping the two duckbill moving contacts is provided between the duckbill moving contact and the contact support frame. The front ends of the two duckbill moving contacts are tilted outward and opened. The static contact mechanism includes a duckbill static contact for inserting between the two duckbill moving contacts of the moving contact mechanism. The utility model adopts the combination of duckbill static contact and duckbill moving contact, which can make the dry-type transformer body and the static contact unit quickly connected or disconnected.

[0032] The dry-type transformer device also includes a track that facilitates the connection and disconnection of the dry-type transformer body and the stationary contact unit. Track wheels corresponding to the track are located at the bottom of the dry-type transformer body. The dry-type transformer body is positioned on the track, further facilitating the rapid connection and disconnection between the dry-type transformer body and the stationary contact unit. A track limiter is also provided between the dry-type transformer body and the track wheel to limit the forward and backward movement of the dry-type transformer body.

[0033] As an embodiment, the moving contact mechanism includes a temperature sensor for detecting the temperature of the contact support frame, and the temperature sensor triggers the corresponding heat dissipation cooling air duct to blow air to dissipate heat from the duckbill moving contact.

[0034] As one embodiment, the dry-type transformer device further includes a withdrawable hydraulic mechanism, which includes a hydraulic push rod assembly and a hydraulic drive assembly for driving the hydraulic push rod assembly. The hydraulic push rod assembly is correspondingly connected to the dry-type transformer body and the stationary contact unit. The hydraulic push rod assembly connects and disconnects the moving contact unit of the dry-type transformer body with the stationary contact unit. The withdrawable hydraulic mechanism enables rapid connection and disconnection between the dry-type transformer body and the stationary contact unit. The withdrawable hydraulic mechanism allows the dry-type transformer body to be withdrawn away from the power supply and load terminals.

[0035] In one embodiment, a hydraulic push rod assembly includes a support tube, a piston push rod, and a hydraulic cylinder. The piston push rod is mounted within the hydraulic cylinder. The front end of the piston push rod is connected to the support tube, the hydraulic cylinder is connected to the dry-type transformer body, and the support tube is connected to the stationary contact unit. Multiple hydraulic push rod assemblies are arranged in parallel, preferably with four groups (a, b, c, and d). The inner surface of the support tube is coated with a graphite lubricating layer.

[0036] Under the action of hydraulic pressure, the withdrawable hydraulic mechanism can simultaneously connect or disconnect the movable contact mechanisms on the power supply side and the load side of the transformer of the present invention with the movable contact mechanisms on the opposite side. The movable contact mechanisms on the power supply side and the load side are plugged in to complete the operation of the electrical circuit.

[0037] The hydraulic drive assembly includes a main container, a booster pump, a booster motor, a crankshaft connecting rod, a main hydraulic cylinder, an oil return pipe, a return pipe, an oil injection pipe, a suction pipe, a Y-type output pipe, a return branch pipe A, a return branch pipe B, a return branch pipe C, an oil injection branch pipe A, and an oil injection branch pipe B. The main container is filled with lubricating fluid, and a main piston is provided in the main hydraulic cylinder. The booster pump sucks the lubricating fluid in the main container through the suction pipe. The Y-type output pipe consists of a main output pipe and two branch output pipes. The booster pump supplies oil to one end of the main hydraulic cylinder (i.e. Figure 5 The lubricating fluid is injected into the middle and lower end) or the other end, and the pressure motor drives the pressure pump through the crankshaft connecting rod. One end of the main hydraulic cylinder is connected to the main container through the return oil pipe, and one end of the return pipe is connected to the two ends of the hydraulic cylinder respectively through the return branch pipe A and the return branch pipe B. The other end of the return pipe is connected to the main container and the other end of the main hydraulic cylinder (i.e. Figure 5 The upper middle end of the oil filling pipe is connected to the other end of the main hydraulic cylinder, and the other end of the oil filling pipe is connected to the two ends of the hydraulic cylinder through the oil filling branch pipe A and the oil filling branch pipe B. Solenoid valves are provided in the return oil pipe, reflux pipe, oil filling pipe, reflux branch pipe A, reflux branch pipe B, reflux branch pipe C, oil filling branch pipe A, oil filling branch pipe B and the two branch output pipes of the Y-type output pipe. The hydraulic drive assembly drives the piston push rod of the hydraulic push rod assembly to move by controlling the opening / closing of each solenoid valve, so that the moving contact unit of the dry-type transformer body is connected or separated with the stationary contact unit. Limit switches are provided at the upper and lower ends of the main hydraulic cylinder (i.e. Figure 5-Figure 8 Limit switch 3LS1 and limit switch 3LS2 in the ).

[0038] like Figure 5-Figure 8 As shown, the solenoid valves in the oil return pipe, reflux pipe, oil injection pipe, reflux branch pipe A, reflux branch pipe B, reflux branch pipe C, oil injection branch pipe A, oil injection branch pipe B and the two branch output pipes of the Y-type output pipe are solenoid valve V6, solenoid valve V9, solenoid valve V10, solenoid valve V1, solenoid valve V2, solenoid valve V3, solenoid valve V4, solenoid valve V5, solenoid valve V7 and solenoid valve V8 respectively.

[0039] The working principle of the pull-out hydraulic mechanism of the utility model is:

[0040] 1) Main piston moves upward to debug:

[0041] In the test mode, first disconnect solenoid valves V9 and V10, then disconnect solenoid valves V6 and V8, and connect solenoid valves V3 and V7. This starts the booster motor and drives the reciprocating booster pump. Lubricating fluid is sucked from the main container and injected into the lower part of the main hydraulic cylinder through V7, pushing the main piston upward. The lubricating fluid on the main hydraulic cylinder flows back to the main container through V3 and the return pipe until the main piston moves upward to the upper end and presses the normally closed limit switch 3LS1. This switch disconnects the motor contactor circuit, and the booster motor is de-energized and stopped, completing the main piston upward movement process. The main piston leaves the corresponding position, and 3LS1 has a built-in spring to return it. Figure 5 .

[0042] 2) Main piston moves downward for debugging:

[0043] In the main piston return mode, first disconnect solenoid valves V9 and V10, then disconnect solenoid valves V3 and V7, connect solenoid valves V6 and V8, start the booster motor and drive the booster pump. Lubricating fluid is sucked from the main reservoir and injected into the lower part of the main hydraulic cylinder through V8, pushing the main piston downward. The lubricating fluid in the main hydraulic cylinder returns to the main reservoir through V6 and the return oil pipe until the main piston moves downward to the lower end and presses the normally closed limit switch 3LS2. This switch disconnects the motor contactor circuit, and the booster motor is de-energized and stopped, completing the main piston downward movement process. The main piston leaves the corresponding position, and 3LS2 has a built-in spring to return it. Figure 6 .

[0044] 3) The main body of the dry-type transformer of the utility model is powered in place:

[0045] After the necessary tests are completed, the main body of the dry-type transformer is on the track, and the contact plugging is completed by the pull-out hydraulic mechanism of the utility model. First, the solenoid valves V3, V6, V8, V4, and V2 are disconnected, and the solenoid valves V7, V10, V5, and V1 are turned on. The boosting motor is started to drive the boosting pump to work, and the lubricating fluid is sucked from the main container and injected into the lower part of the main hydraulic cylinder through V7, pushing the main piston to move upward. The lubricating fluid on the main hydraulic cylinder flows back to the main container through V3 and the return pipe until the main piston moves upward to the upper end to squeeze the normally closed limit switch 3LS1. The switch disconnects the motor contactor circuit, and the boosting motor is powered off and stopped, completing the main piston upward movement process. The main piston leaves the corresponding position, and 3LS1 has a built-in spring to return. The piston push rod of the pull-out hydraulic mechanism moves to the left to complete the contact plugging. Under the action of the hydraulic pressure, the power supply and load sides are plugged in to form an electrical path. For the working principle of the pull-out hydraulic mechanism, please refer to Figure 7 .

[0046] 4) The main body of the dry-type transformer of the utility model is separated from the power supply side and the load side:

[0047] The dry-type transformer body of the utility model is installed on a track, and the draw-out hydraulic mechanism of the utility model is used to drive the dry-type transformer body to separate from the power supply side and away from the load side.

[0048] First, confirm that the main piston is in the low position or reset, disconnect the solenoid valves V3, V6, V8, V5, and V1, and connect the solenoid valves V7, V10, V4, and V2. Start the booster motor to drive the booster pump. The hydraulic fluid is sucked from the main container and injected into the main hydraulic cylinder through V7, pushing the main piston upward. The lubricating fluid on the main hydraulic cylinder flows back to the main container through V3 and the return pipe until the main piston moves upward to the upper end and squeezes the normally closed limit switch 3LS1. The switch disconnects the motor contactor circuit, and the booster motor is powered off and stopped, completing the main piston upward movement process. The main piston leaves the corresponding position, and 3LS1 has a built-in spring to return. For the principle of contact plugging, the piston push rod of the pull-out hydraulic mechanism of this utility model moves to the left to complete the contact plugging, see Figure 8 .

[0049] The hydraulic drive assembly of this utility model adopts pulsating pressurization. The hydraulic drive assembly of this utility model rotates the pressurizing motor, drives the crankshaft connecting rod to reciprocate and suck the lubricating fluid in the main container, and pressurizes it into the main hydraulic cylinder to achieve the left and right movement of the piston push rod, driving the dry-type transformer body to move. The lubricating fluid is pulsating pressurized, see Figure 9 , Figure 9 This is a graph showing the flow rate Q of the booster pump changing with time T.

[0050] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dry-type transformer device, characterized in that: It includes a dry-type transformer body and a stationary contact unit. A moving contact unit corresponding to the stationary contact unit is provided on the dry-type transformer body. The stationary contact unit includes several stationary contact mechanisms. The moving contact unit includes several moving contact mechanisms corresponding to the stationary contact mechanisms one by one. The moving contact mechanism includes a busbar conductive plate, a contact support frame and two duckbill moving contacts. The two duckbill moving contacts are relatively arranged on the busbar conductive plate. A pressure spring for clamping the two duckbill moving contacts is provided between the duckbill moving contact and the contact support frame. The static contact mechanism includes a duckbill static contact for inserting between the two duckbill moving contacts of the moving contact mechanism.

2. The dry-type transformer device according to claim 1, characterized in that: It also includes a withdrawable hydraulic mechanism, which includes a hydraulic push rod assembly and a hydraulic drive assembly for driving the hydraulic push rod assembly. The hydraulic push rod assembly is correspondingly connected to the dry-type transformer body and the stationary contact unit. The hydraulic push rod assembly enables the moving contact unit of the dry-type transformer body to dock or separate with the stationary contact unit.

3. The dry-type transformer device according to claim 2, characterized in that: The hydraulic push rod assembly includes a support tube, a piston push rod, and a hydraulic cylinder. The piston push rod is installed in the hydraulic cylinder. The front end of the piston push rod is connected to the support tube, the hydraulic cylinder is connected to the dry-type transformer body, and the support tube is connected to the stationary contact unit.

4. The dry-type transformer device according to claim 3, characterized in that: The hydraulic drive assembly includes a main container, a booster pump, a booster motor, a crankshaft connecting rod, a master hydraulic cylinder, an oil return pipe, a reflux pipe, an oil injection pipe, a suction pipe, a Y-type output pipe, a reflux branch pipe A, a reflux branch pipe B, a reflux branch pipe C, an oil injection branch pipe A, and an oil injection branch pipe B. The main container is filled with lubricating fluid, and a main piston is correspondingly provided in the master hydraulic cylinder. The booster pump sucks the lubricating fluid in the main container through the suction pipe. The Y-type output pipe consists of a main output pipe and two branch output pipes. The booster pump injects lubricating fluid into one end or the other end of the master hydraulic cylinder through the Y-type output pipe. The booster motor drives the booster pump through the crankshaft connecting rod. One end of the master hydraulic cylinder is connected to the main container through the oil return pipe, and one end of the reflux pipe is connected to the main container through the reflux branch pipe. Pipe A and return branch pipe B are respectively connected to the two ends of the hydraulic cylinder, the other end of the return pipe is connected to the main container and connected to the other end of the main hydraulic cylinder through the return branch pipe C, one end of the oil filling pipe is connected to the other end of the main hydraulic cylinder, and the other end of the oil filling pipe is respectively connected to the two ends of the hydraulic cylinder through the oil filling branch pipe A and the oil filling branch pipe B. Solenoid valves are installed in the return pipe, return pipe, oil filling pipe, return branch pipe A, return branch pipe B, return branch pipe C, oil filling branch pipe A, oil filling branch pipe B and the two branch output pipes of the Y-shaped output pipe. The hydraulic drive assembly drives the piston push rod of the hydraulic push rod assembly to move by controlling the opening / closing of each solenoid valve, so that the moving contact unit of the dry-type transformer body is connected or separated with the stationary contact unit.

5. The dry-type transformer device according to claim 4, characterized in that: The hydraulic drive assembly is pressurized using a pulsating pressurization method.

6. The dry-type transformer device according to claim 4, characterized in that: Limit switches are provided at both ends of the main hydraulic cylinder.

7. The dry-type transformer device according to claim 2, characterized in that: There are multiple groups of hydraulic push rod assemblies, and the multiple groups of hydraulic push rod assemblies are arranged in parallel.

8. The dry-type transformer device according to claim 3, characterized in that: The inner surface of the support cylinder is coated with a graphite lubricating layer.

9. The dry-type transformer device according to claim 1, characterized in that: It also includes a track for facilitating the docking or separation of the dry-type transformer body and the stationary contact unit. A track wheel corresponding to the track is provided at the bottom of the dry-type transformer body, and the dry-type transformer body is correspondingly arranged on the track.

10. The dry-type transformer device according to claim 1, characterized in that: The stationary contact unit also includes a low-voltage busbar device for outputting voltage and a high-voltage cable terminal for externally connecting high-voltage electricity. The output end of the dry-type transformer body is connected to the low-voltage busbar device through a stationary contact mechanism and a moving contact mechanism, and the input end of the dry-type transformer body is connected to the high-voltage cable terminal through a stationary contact mechanism and a moving contact mechanism.

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