Method for installing and debugging transformer in power transmission and distribution engineering

Abstract

The invention relates to the technical field of transformers, in particular to a method for installing and debugging a transformer in power transmission and distribution engineering, which comprises the following steps: connecting a hoisting steel wire rope of a crane with a landing micro-control device, connecting the lower end of the landing micro-control device with the transformer in a hoisting manner, and hoisting the transformer above an installation foundation by the crane through the landing micro-control device, the position of the transformer is adjusted so that the transformer can be aligned with an embedded part or an installation bolt hole in the foundation; the installation and debugging method of the transformer is suitable for installation of the intelligent large transformer, the lifting impact on the intelligent large transformer can be reduced, and when the transformer descends to the foundation, the transformer is visually and accurately controlled to slowly descend at the position close to the transformer, so that descending control is finer and more stable.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a method for installing and debugging a transformer in a power transmission and distribution project. Background Art

[0002] When installing a large intelligent transformer, it is necessary to use a crane or other lifting equipment to lift the large transformer to the installation foundation. During this process, the workers on the installation foundation need to communicate with the crane driver over long distances to control the position of the transformer, especially at the moment when the transformer falls on the installation foundation. Since there is a certain delay in communicating with the crane driver at a long distance, and it is difficult for the crane itself to achieve extremely precise retraction and release when controlling the wire rope, it is very easy for the large transformer to generate a certain collision impact force when it falls on the foundation. Large intelligent transformers have strict requirements on transportation and installation. The inclination angle cannot be greater than 15 degrees during the entire transportation and installation process, and impact force is strictly prohibited. The impact force generated by the above-mentioned transformer falling on the foundation may cause the core clamping device to fail, resulting in misalignment of silicon steel sheets, damage to insulation, and stress on solder joints. Improvements are needed. Summary of the invention

[0003] The purpose of the present invention is to provide a method for installing and debugging a transformer in a power transmission and distribution project to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a method for installing and debugging a transformer in a power transmission and distribution project, the method comprising the following steps: Step 1: Connect the lifting wire rope of the crane to the landing micro-control device, the lower end of the landing micro-control device is connected to the transformer hoisting, the crane lifts the transformer to the top of the installation foundation through the landing micro-control device, and adjusts the position of the transformer to align it with the embedded parts or installation bolt holes on the foundation; Step 2: First, the crane controls the transformer to descend through the wire rope. After it is a certain distance away from the installation foundation, the transformer is controlled to descend through the landing micro-control device, so that the transformer falls smoothly onto the foundation to avoid collision and impact. Step 3: After the transformer is in place, use the jack and level to add or remove gaskets under the base of the transformer to make the transformer level. According to the specifications and installation requirements of the transformer, select bolts of appropriate specifications and tighten them according to the specified torque. Step 4: Install accessories and connect cables; Step five: debugging test, including insulation test, ratio test, polarity test, no-load test and load test.

[0005] In the fourth step, the accessories include a radiator, a gas relay, and an oil conservator. The oil conservator is installed at the corresponding position on the top of the transformer through a pipeline. The gas relay is installed on the pipeline between the transformer and the oil conservator. When installing, pay attention to the direction of the gas relay so that its arrow points to the oil conservator. Install the radiator on both sides of the transformer tank, and connect the pipeline between the radiator and the tank to ensure firm connection and reliable sealing.

[0006] The described landing micro-control device specifically includes an outer cylinder body and an inner cavity opened inside the outer cylinder body. A piston main disk is arranged in the inner cavity, and there is an airtight contact between the inner cavity and the piston main disk. A connecting shaft is fixedly arranged on the piston main disk. An exhaust check valve and a current-limiting structure are arranged on the outer cylinder body. Both the exhaust check valve and the current-limiting structure are communicated with the upper part of the inner cavity. Through the exhaust check valve, the gas in the inner cavity flows unidirectionally to the outside. When the current-limiting structure is closed, the outside gas will not enter the inner cavity. When the current-limiting structure is opened, the outside gas enters the inner cavity after being current-limited by the current-limiting structure.

[0007] The current-limiting structure includes a top groove, a current-limiting micropore, and a coaxial cavity. The top groove, the current-limiting micropore, and the coaxial cavity are all opened in the outer cylinder body. The top groove is communicated with the coaxial cavity through the current-limiting micropore, and the top groove is communicated with the upper part of the inner cavity.

[0008] An adjusting screw is spirally installed in the coaxial cavity. One end of the adjusting screw is fixedly provided with a conical head, and the other end of the adjusting screw is fixedly provided with an adjusting dial. By rotating the adjusting dial, the adjusting screw rotates, and then it can drive the adjusting screw and the conical head to move axially. When the conical head is in pressing contact with the end of the current-limiting micropore, the current-limiting micropore can be closed. When the conical head is separated from the current-limiting micropore, the current-limiting micropore is communicated with the coaxial cavity and opened.

[0009] An air intake filter hole is opened through the side wall of the coaxial cavity, and a filter cotton core is arranged in the air intake filter hole.

[0010] A sealing rubber ring is embedded and installed on the outer surface of the piston main disk. The piston main disk is in sliding sealing contact with the inner wall surface of the inner cavity through the sealing rubber ring. An elliptical ring cavity is opened in the sealing rubber ring. The elliptical ring cavity is circular and its cross-section is elliptical.

[0011] A sealing connection nozzle is arranged on the sealing rubber ring, and the sealing connection nozzle is communicated with the elliptical ring cavity. A connection groove hole is opened on the piston main disk, and the sealing connection nozzle is sealingly inserted into the connection groove hole. An interaction flow channel is arranged inside the piston main disk, and one end of the interaction flow channel is communicated with the elliptical ring cavity through the sealing connection nozzle.

[0012] A sealed shaft cavity is provided in the connecting shaft, and a metal corrugated cover is arranged in the sealed shaft cavity. The metal corrugated cover cooperates with the side wall and the top wall of the connecting shaft to form a sealed cavity, and this sealed cavity is communicated with the interaction flow channel; a liquid medium is filled in the above-mentioned sealed cavity, interaction flow channel and elliptical ring cavity.

[0013] A circular groove portion is provided on the upper end surface of the piston main disk, and a negative pressure corrugated cover is arranged in the circular groove portion. A synchronous sealing shaft is fixedly connected between the negative pressure corrugated cover and the metal corrugated cover. The synchronous sealing shaft penetrates through the piston main disk, and there is a sealed contact between the synchronous sealing shaft and the piston main disk.

[0014] When the upper part of the piston main disk is in a negative pressure state, the negative pressure acts on the negative pressure corrugated cover, which can drive the synchronous sealing shaft to move upward, so that the liquid medium above the metal corrugated cover is extruded and enters the elliptical ring cavity through the interaction flow channel; an inclined ventilation hole is externally communicated at the bottom of the circular groove portion.

[0015] A barometric sensor for detecting the internal gas pressure of the sealed shaft cavity is fixedly arranged on the inner wall surface of the sealed shaft cavity; A heat-resistant bracket and a heating wire are arranged in the sealed shaft cavity, and the heating wire is supported by the heat-resistant bracket. A secondary control jack is arranged outside the connecting shaft, and the heating wire and the barometric sensor are conductively connected to the outside through the secondary control jack.

[0016] Compared with the prior art, the beneficial effects of the present invention are: The installation and debugging method of the transformer of the present invention is applicable to the installation of intelligent large transformers. By means of the cooperatively arranged landing micro-control device, during the hoisting and lifting process, the pulling impact on the intelligent large transformer can be reduced. When the transformer lands on the foundation, the worker can visually and precisely control the slow descent of the transformer at the terminal position near the transformer through the landing micro-control device, making the landing control more precise and stable, greatly reducing the impact force generated when the transformer lands on the foundation, and reducing the risk of damage during installation.

[0017] Through the cooperation of structures such as the negative pressure corrugated cover, metal corrugated cover and synchronous sealing shaft provided by the present invention, the contact tightness between the sealing rubber ring and the inner cavity changes automatically according to the weight of different transformers; the heavier the transformer hoisted by the landing micro-control device, the higher the contact tightness between the sealing rubber ring and the inner cavity, realizing adaptive control, reducing the unnecessary wear caused when hoisting a slightly lighter transformer, and making the contact pressure between the sealing rubber ring and the inner cavity drop to the lowest after hoisting, which is convenient for manually pushing and squeezing the connecting shaft to reset into the outer cylinder body.

[0018] Through the cooperation of structures such as the sealed shaft cavity, air pressure sensor, and heating wire provided in the present invention, it is possible to actively change the contact tightness between the sealing rubber ring and the inner cavity, as well as the relationship ratio between the weight of the transformer when needed, and achieve secondary precise regulation according to different requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is a schematic diagram of another angle of the overall structure of the present invention.

[0021] Figure 3 It is a schematic diagram of a three-dimensional semi-section of the present invention.

[0022] Figure 4 It is Figure 3 an enlarged schematic diagram of area A in

[0023] Figure 5 It is a front view of a three-dimensional semi-section of the present invention.

[0024] Figure 6 It is Figure 5 an enlarged schematic diagram of area B in

[0025] In the figure: 1. Outer cylinder body; 2. Inner cavity; 3. Piston main disc; 4. Connecting shaft; 5. Exhaust check valve; 101. Top groove; 102. Flow-limiting micropore; 103. Coaxial cavity; 104. Adjusting screw; 105. Conical head; 106. Adjusting dial; 107. Intake filter hole; 108. Filter cotton core; 301. Sealing rubber ring; 302. Oval ring cavity; 303. Sealing connection nozzle; 304. Connecting slot hole; 305. Interaction flow channel; 306. Sealed shaft cavity; 307. Metal corrugated cover; 308. Round groove part; 309. Negative pressure corrugated cover; 310. Synchronous sealing shaft; 311. Oblique ventilation hole; 401. Air pressure sensor; 402. Heat-resistant bracket; 403. Heating wire; 404. Secondary control jack; 6. Hoop part; 7. Breathing bottom hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Please refer to Figures 1 to 6 , the present invention provides a technical solution: an installation and commissioning method for a transformer in a power transmission and distribution project, and this method includes the following steps: Step 1: Connect the lifting wire rope of the crane to the lowering micro-control device. The lower end of the lowering micro-control device is connected to the transformer for hoisting. The crane hoists the transformer above the installation foundation through the lowering micro-control device, and adjusts the position of the transformer to align it with the embedded parts or installation bolt holes on the foundation. Step 2: First, the crane controls the descent of the transformer through the wire rope. After the transformer is at a certain distance from the installation foundation, the lowering micro-control device is used to control the descent of the transformer, so that the transformer lands steadily on the foundation, avoiding collision and impact. Step 3: After the transformer is in place, use a jack and a level to add or subtract shims under the base of the transformer to make the levelness of the transformer qualified. According to the specifications and installation requirements of the transformer, select bolts of appropriate specifications and tighten them according to the specified torque. Step 4: Install accessories and connect cables. The oil conservator is installed at the corresponding position on the top of the transformer through a pipeline. The gas relay is installed on the pipeline between the transformer and the oil conservator. Pay attention to the direction of the gas relay during installation, so that its arrow points to the oil conservator. Install the radiator on both sides of the transformer tank, and connect the pipeline between the radiator and the tank to ensure firm connection and reliable sealing.

[0028] Step 5: Conduct commissioning tests, specifically including insulation tests, turns ratio tests, polarity tests, no-load tests and load tests. During the insulation test, use a megohmmeter to test the insulation resistance between the high-voltage and low-voltage windings of the transformer, between the winding and the iron core, and between the winding and the shell.

[0029] During the turns ratio test, use a turns ratio bridge to test the turns ratio of each tap position of the transformer. During the test, connect the test leads of the turns ratio bridge to the high-voltage and low-voltage windings of the transformer respectively, select the corresponding tap position for testing, read and record the turns ratio displayed by the turns ratio bridge. The turns ratio should be consistent with the nameplate parameters of the transformer.

[0030] During the polarity test, use a multimeter or a polarity tester to test the polarity of the transformer windings.

[0031] During the no-load test, connect the high-voltage side of the transformer to a power supply with rated voltage, and leave the low-voltage side open. Under no-load conditions, measure the no-load current and no-load loss of the transformer. The no-load current and no-load loss should meet the specified requirements. If they exceed the allowable range, find the reasons and deal with them.

[0032] During the load test, connect an appropriate load to the low-voltage side of the transformer, gradually increase the load current to make the transformer operate at rated load. During the load operation process, measure the load loss and short-circuit impedance of the transformer. The load loss and short-circuit impedance should meet the specified requirements.

[0033] The landing micro-control device specifically includes an outer cylinder body 1 and an inner cavity 2 opened inside the outer cylinder body 1. A piston main disc 3 is arranged in the inner cavity 2, and there is an airtight contact between the inner cavity 2 and the piston main disc 3. A connecting shaft 4 is fixedly arranged on the piston main disc 3. An exhaust check valve 5 and a flow-limiting structure are arranged on the outer cylinder body 1. As shown in Figure 4 shown, the exhaust check valve 5 is spirally and hermetically installed inside the outer cylinder body 1. Both the exhaust check valve 5 and the flow-limiting structure are communicated with the upper part of the inner cavity 2. Through the exhaust check valve 5, the gas in the inner cavity 2 flows unidirectionally to the outside. When the flow-limiting structure is closed, the outside gas will not enter the inner cavity 2. When the flow-limiting structure is opened, the outside gas enters the inner cavity 2 after being flow-limited through the flow-limiting structure.

[0034] The flow-limiting structure includes a top groove 101, a flow-limiting micropore 102, and a coaxial cavity 103. The top groove 101, the flow-limiting micropore 102, and the coaxial cavity 103 are all opened in the outer cylinder body 1. The top groove 101 is communicated with the coaxial cavity 103 through the flow-limiting micropore 102, and the top groove 101 is communicated with the upper part of the inner cavity 2. An adjusting screw 104 is spirally installed in the coaxial cavity 103. One end of the adjusting screw 104 is fixedly provided with a frustum-shaped top head 105, and the other end of the adjusting screw 104 is fixedly provided with an adjusting dial 106. By rotating the adjusting dial 106, the adjusting screw 104 rotates, and then the adjusting screw 104 and the frustum-shaped top head 105 can be driven to axially move. When the frustum-shaped top head 105 is in pressing contact with the end of the flow-limiting micropore 102, the flow-limiting micropore 102 can be closed. When the frustum-shaped top head 105 is separated from the flow-limiting micropore 102, the flow-limiting micropore 102 is communicated with the coaxial cavity 103 and opened.

[0035] An air intake filter hole 107 is opened through the side wall of the coaxial cavity 103, and a filter cotton core 108 is arranged in the air intake filter hole 107.

[0036] A sealing rubber ring 301 is embedded and installed on the outer surface of the piston main disc 3. The piston main disc 3 is in sliding and sealing contact with the inner wall surface of the inner cavity 2 through the sealing rubber ring 301. An elliptical ring cavity 302 is opened in the sealing rubber ring 301. The elliptical ring cavity 302 is circular, and its cross-section is elliptical.

[0037] A sealing connecting nozzle 303 is arranged on the sealing rubber ring 301. The sealing connecting nozzle 303 is communicated with the elliptical ring cavity 302. A connecting slot hole 304 is opened on the piston main disc 3. The sealing connecting nozzle 303 is hermetically inserted into the connecting slot hole 304. During installation, glue is applied between the sealing connecting nozzle 303 and the connecting slot hole 304. When the sealing connecting nozzle 303 and the connecting slot hole 304 are inserted and matched, the solidification of the glue can ensure the sealing performance between the sealing connecting nozzle 303 and the connecting slot hole 304.

[0038] An alternating flow channel 305 is provided inside the piston main disc 3 , and one end of the alternating flow channel 305 is communicated with the elliptical annular cavity 302 through a sealing connection nozzle 303 .

[0039] A closed shaft cavity 306 is opened in the connecting shaft 4, and a metal corrugated cover 307 is arranged in the closed shaft cavity 306. The metal corrugated cover 307 cooperates with the side wall and the top wall of the connecting shaft 4 to form a closed cavity, and the closed cavity is connected with the interactive flow channel 305; the above-mentioned closed cavity, the interactive flow channel 305 and the elliptical ring cavity 302 are all filled with liquid medium, and the liquid medium does not need to contact with the rubber material to generate corrosion. The pressure conduction efficiency is improved by the incompressible nature of the liquid.

[0040] A circular groove 308 is formed on the upper surface of the piston main disc 3, and a negative pressure corrugated cover 309 is arranged in the circular groove 308. A synchronous sealing shaft 310 is connected and fixedly arranged between the negative pressure corrugated cover 309 and the metal corrugated cover 307. The synchronous sealing shaft 310 penetrates through the piston main disc 3, and the synchronous sealing shaft 310 is in sealing contact with the piston main disc 3. The metal corrugated cover 307 and the negative pressure corrugated cover 309 are as shown in FIG. Figure 6 As shown in the figure, they are all made of metal and are connected to the inner wall of the circular groove 308 and the sealed shaft cavity 306 by welding to ensure stable sealing performance. The cross-sections of the metal corrugated cover 307 and the negative pressure corrugated cover 309 are both corrugated and can be deformed and moved.

[0041] When the upper part of the piston main disk 3 is in a negative pressure state, the negative pressure acts on the negative pressure corrugated cover 309, which can drive the synchronous sealing shaft 310 to move upward, so that the liquid medium above the metal corrugated cover 307 is squeezed and enters the elliptical annular cavity 302 through the interactive flow channel 305; the bottom of the circular groove part 308 is connected to the outside and is provided with an oblique ventilation hole 311.

[0042] A gas pressure sensor 401 for detecting the gas pressure inside the sealed shaft cavity 306 is fixedly arranged on the inner wall surface of the sealed shaft cavity 306; A heat-resistant bracket 402 and a heating wire 403 are provided in the closed shaft cavity 306 , and the heating wire 403 is supported by the heat-resistant bracket 402 . A secondary control socket 404 is provided on the outside of the connecting shaft 4 , and the heating wire 403 and the air pressure sensor 401 are connected to the outside through the secondary control socket 404 .

[0043] like Figure 2 and Figure 3 As shown in the figure, the upper part of the outer cylinder body 1 and the lower end of the connecting shaft 4 are respectively fixed with a lifting ring part 6. When in use, the lifting ring part 6 at the upper position of the outer cylinder body 1 is connected to the wire rope of the crane, and the lifting ring part 6 at the lower end position of the connecting shaft 4 is connected to the transformer hoisting.

[0044] like Figure 3As shown, a breathing bottom hole 7 is penetrated and opened at the bottom position of the outer cylinder body 1. Through the arrangement of the breathing bottom hole 7, when the piston main disk 3 moves up and down inside the inner cavity 2, the gas below the piston main disk 3 can communicate with the external atmospheric pressure through the breathing bottom hole 7. A filtering structure such as a filter membrane can be set in the breathing bottom hole 7 to prevent sundries such as sand and gravel from entering the inner cavity 2 through the breathing bottom hole 7 in the harsh construction environment, thus affecting the service life of the device.

[0045] When hoisting the transformer by the landing micro-control device, first, the connecting shaft 4 is completely retracted into the inner cavity 2. At this time, the piston main disk 3 is at the uppermost position in the inner cavity 2; initially, the frustum top 105 blocks and seals the current-limiting micropore 102. When the crane pulls the landing micro-control device upward through the steel wire rope, and the landing micro-control device drives the transformer to rise instantly, the upper part of the piston main disk 3 enters a negative pressure state, and the piston main disk 3 generates a negative pressure through a small elastic downward movement, so that the impact force of the steel wire rope traction and lifting is alleviated, reducing the lifting impact on the intelligent large transformer.

[0046] After moving the transformer to above the installation foundation by the crane, first, the crane releases the steel wire rope to control the transformer to move downward. When the transformer is within a certain range from the installation foundation, the worker on the installation foundation operates the landing micro-control device to make the transformer continue to move downward.

[0047] The worker manually rotates the adjusting dial 106 to make the frustum top 105 move away from the current-limiting micropore 102. At this time, the current-limiting micropore 102 communicates with the coaxial cavity 103. The external gas is filtered by the filter cotton core 108 and then enters the current-limiting micropore 102 through the air inlet filter hole 107 and the coaxial cavity 103. After being current-limited by the current-limiting micropore 102, it finally enters above the piston main disk 3. Since air enters above the piston main disk 3, at this time, the piston main disk 3 slowly moves downward inside the inner cavity 2, making the connecting shaft 4 extend downward relative to the outer cylinder body 1, and the transformer moves downward. The worker changes the distance between the current-limiting micropore 102 and the frustum top 105 by rotating the adjusting dial 106, thereby changing the air intake flow rate and opening and closing condition of the current-limiting micropore 102, enabling the transformer to achieve speed control and pause at any time during the slow descent process, greatly reducing the possibility of the transformer being impacted when it lands on the installation foundation.

[0048] After the landing is completed, the landing micro-control device is removed, and the connecting shaft 4 is directly pushed back into the outer cylinder body 1. The gas above the piston main disk 3 is unidirectionally discharged to the outside through the exhaust check valve 5.

[0049] In the above process, the heavier the weight of the hoisted transformer, the greater the negative pressure generated above the piston main disk 3, as Figure 4 and Figure 6As shown, a negative pressure acts on the negative pressure corrugated cover 309, causing the negative pressure corrugated cover 309 to bulge upward, driving the synchronous sealing shaft 310 to move upward. When the synchronous sealing shaft 310 moves upward, the metal corrugated cover 307, driven by the synchronous sealing shaft 310, further squeezes the liquid medium above the metal corrugated cover 307 into the elliptical ring cavity 302 through the interaction flow channel 305, causing the elliptical ring cavity 302 to expand and increasing the contact pressure between the sealing rubber ring 301 and the inner cavity 2. The greater the contact pressure, the higher the sealing performance. And the contact pressure is proportional to the weight of the transformer, achieving automatic adaptation.

[0050] By presetting the diameter ratio of the negative pressure corrugated cover 309 and the metal corrugated cover 307, the pressure acting area can be changed, thereby realizing the setting of the initial conversion ratio.

[0051] As Figure 4 and Figure 6 shown, the extrusion force on the liquid medium above the metal corrugated cover 307 is equal to the sum of the pressure generated by the upward movement of the synchronous sealing shaft 310 and the pressure on the lower surface of the metal corrugated cover 307. When the pressure in the sealed shaft cavity 306 increases, the pressure acts on the lower surface of the metal corrugated cover 307, which will assist the synchronous sealing shaft 310 in squeezing the liquid medium above the metal corrugated cover 307. Therefore, as Figure 2 and Figure 3 shown, when electronic control adjustment is required, the air pressure sensor 401 and the heating wire 403 are electrically connected to the outside through the secondary control jack 404, and the heating wire 403 is powered, causing the heating wire 403 to heat the gas in the sealed shaft cavity 306. The gas in the sealed shaft cavity 306 expands when heated, and the pressure increases, thereby increasing the pressure acting on the lower surface of the metal corrugated cover 307, so that when lifting a transformer of the same weight, the contact pressure between the sealing rubber ring 301 and the inner cavity 2 is increased, and secondary precise proportional control is carried out. The pressure in the sealed shaft cavity 306 is detected by the air pressure sensor 401 to achieve closed-loop feedback control and improve the accuracy.

[0052] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Installation and commissioning method of transformer in power transmission and distribution project, characterized in that, The method includes the following steps: Step 1: Connect the hoisting steel wire rope of the crane to the landing micro-control device. The lower end of the landing micro-control device is connected to the transformer for hoisting. The crane hoists the transformer above the installation foundation through the landing micro-control device, and adjusts the position of the transformer to align it with the embedded parts or installation bolt holes on the foundation; Step 2: First, the crane controls the descent of the transformer through the steel wire rope. After a certain distance from the installation foundation, the landing micro-control device is used to control the descent of the transformer, so that the transformer smoothly lands on the foundation, avoiding collision and impact; Step 3: After the transformer is in place, use a jack and a level to cooperate to add or subtract gaskets under the base of the transformer to make the level of the transformer qualified. Select bolts of appropriate specifications according to the specifications and installation requirements of the transformer, and tighten them according to the specified torque; Step 4: Install accessories and connect cables; Step 5: Conduct commissioning tests, specifically including insulation tests, ratio tests, polarity tests, no-load tests and load tests.

2. The installation and commissioning method of the transformer in the power transmission and distribution project according to claim 1, wherein: The accessories in Step 4 include a radiator, a gas relay and an oil conservator. The oil conservator is installed at the corresponding position on the top of the transformer through a pipeline. The gas relay is installed on the pipeline between the transformer and the oil conservator. Pay attention to the direction of the gas relay during installation so that its arrow points to the oil conservator; Install the radiator on both sides of the transformer tank, and connect the pipeline between the radiator and the tank to ensure firm connection and reliable sealing.

3. The installation and commissioning method of the transformer in the power transmission and distribution project according to claim 1, wherein: The landing micro-control device specifically includes an outer cylinder body and an inner cavity opened inside the outer cylinder body. A piston main disk is arranged in the inner cavity, and there is an airtight contact between the inner cavity and the piston main disk; A connecting shaft is fixedly arranged on the piston main disk. An exhaust check valve and a current-limiting structure are arranged on the outer cylinder body. Both the exhaust check valve and the current-limiting structure are communicated with the upper part of the inner cavity. The gas in the inner cavity can flow unidirectionally to the outside through the exhaust check valve; When the current-limiting structure is closed, the outside gas will not enter the inner cavity. When the current-limiting structure is opened, the outside gas enters the inner cavity after being limited by the current-limiting structure.

4. The installation and commissioning method of the transformer in the power transmission and distribution project according to claim 3, characterized in that: The current-limiting structure includes a top groove, a current-limiting micro-hole and a coaxial cavity. The top groove, the current-limiting micro-hole and the coaxial cavity are all opened in the outer cylinder body. The top groove is communicated with the coaxial cavity through the current-limiting micro-hole, and the top groove is communicated with the upper part of the inner cavity.

5. The installation and commissioning method of the transformer in the power transmission and distribution project according to claim 4, characterized in that: An adjusting screw is spirally installed in the coaxial cavity. One end of the adjusting screw is fixedly provided with a conical head, and the other end of the adjusting screw is fixedly provided with an adjusting dial. By rotating the adjusting dial, the adjusting screw can be rotated, and then the adjusting screw and the conical head can be driven to move axially. When the conical head squeezes and contacts the end of the current-limiting micro-hole, the current-limiting micro-hole can be closed. When the conical head is separated from the current-limiting micro-hole, the current-limiting micro-hole is communicated with the coaxial cavity and opened.

6. The installation and commissioning method of the transformer in the power transmission and distribution project according to claim 5, characterized in that: An air intake filter hole is opened through the side wall of the coaxial cavity, and a filter cotton core is arranged in the air intake filter hole.

7. The installation and commissioning method of the transformer in the power transmission and distribution project according to claim 3, characterized in that: A sealing rubber ring is embedded and installed on the outer surface of the piston main disk. The piston main disk is in sliding seal contact with the inner wall surface of the inner cavity through the sealing rubber ring. An elliptical ring cavity is opened in the sealing rubber ring. The elliptical ring cavity is circular and has an elliptical cross-section.

8. The installation and commissioning method of the transformer in the power transmission and distribution project according to claim 7, characterized in that: The sealing rubber ring is provided with a sealing connecting nozzle, the sealing connecting nozzle communicates with the elliptical ring cavity, a connecting groove hole is formed in the piston main disk, and the sealing connecting nozzle is hermetically inserted into the connecting groove hole; An interaction flow channel is arranged inside the piston main disk, and one end of the interaction flow channel communicates with the elliptical ring cavity through the sealing connecting nozzle.

9. The installation and commissioning method of the transformer in the power transmission and distribution project according to claim 8, characterized in that: A sealed shaft cavity is formed in the connecting shaft, a metal corrugated cover is arranged in the sealed shaft cavity, the metal corrugated cover cooperates with the side wall and the top wall of the connecting shaft to form a sealed cavity, and the sealed cavity communicates with the interaction flow channel; a liquid medium is filled in the sealed cavity, the interaction flow channel and the elliptical ring cavity.

10. The installation and commissioning method of the transformer in the power transmission and distribution project according to claim 9, characterized in that: A circular groove part is formed on the upper end surface of the piston main disk, a negative pressure corrugated cover is arranged in the circular groove part, a synchronous sealing shaft is fixedly connected between the negative pressure corrugated cover and the metal corrugated cover, the synchronous sealing shaft penetrates through the piston main disk, and the synchronous sealing shaft is in sealing contact with the piston main disk.

11. The installation and commissioning method of the transformer in the power transmission and distribution project according to claim 10, characterized in that: When the upper part of the piston main disk is in a negative pressure state, the negative pressure acts on the negative pressure corrugated cover, which can drive the synchronous sealing shaft to move upward, so that the liquid medium above the metal corrugated cover is extruded and enters the elliptical ring cavity through the interaction flow channel; an inclined ventilation hole is externally communicated with the bottom of the circular groove part.

12. The installation and commissioning method of the transformer in the power transmission and distribution project according to claim 9, characterized in that: A barometric pressure sensor for detecting the internal gas pressure of the sealed shaft cavity is fixedly arranged on the inner wall surface of the sealed shaft cavity; A heat-resistant bracket and a heating wire are arranged in the sealed shaft cavity, the heating wire is supported by the heat-resistant bracket, a secondary control jack is arranged outside the connecting shaft, and the heating wire and the barometric pressure sensor are electrically connected to the outside through the secondary control jack.

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