A Method for Overall Disassembly, Assembly, Transportation of Transformer Leads

Abstract

The present invention belongs to the technical field of disassembly, assembly, and transportation of disassembled transformer leads, and particularly relates to a method for disassembling and transporting the entire lead of a disassembled transformer. The method includes lead disassembly and transportation, and lead on-site installation. The lead disassembly and transportation is carried out in an integrated manner. After disassembly, the high-voltage lead, voltage-regulating lead, and insulating wooden components are fixed to a lead disassembly and transportation bracket. The bracket is then secured to a transport cover plate together with a support cushion using a locking device, and then transported to the installation site together with the transformer body. The present invention greatly improves the efficiency of disassembly and reassembly of the high-voltage lead, and the modular disassembly and assembly method is less likely to cause loss or damage to insulating components.

Description

Technical Field

[0001] The invention belongs to the technical field of disassembly, assembly and transportation of disassembled transformer leads, and in particular relates to a method for integrally disassembling, assembly and transportation of disassembled transformer leads. Background Art

[0002] In mountainous and plateau areas, the transportation of large equipment is limited by transportation constraints such as bridge loads and tunnel limits. Consequently, these areas often rely on disassembled transformers, which presents numerous challenges in transporting components such as the transformer's oil tank, core, coil, and leads. With the continuous development of power systems, the capacity of 500kV transformers has reached as high as 750MVA. When disassembling and transporting such large-capacity transformers, traditional disassembly methods are insufficient. Currently, the method for disassembling and transporting the leads of large-capacity transformers still relies on removing all leads and insulation components and reinstalling them on-site. This method is cumbersome and inefficient. Summary of the Invention

[0003] In response to the above problems, the purpose of the present invention is to provide a method for disassembling and transporting the leads of a dismantled transformer as a whole, so as to solve the problem that the existing method for transporting the leads of a dismantled transformer is to remove all the leads, wooden parts, wire clamps and other insulating clamping parts after completing the factory experiment, place them according to categories and transport them together with the dismantled transformer oil tank, and then reassemble them on site, which is cumbersome and inefficient.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for disassembling and transporting the leads of a dismantled transformer as a whole, the method comprising lead disassembly and transportation and lead on-site installation; wherein the lead disassembly and transportation adopts an integral transportation mode, wherein the high-voltage lead, voltage-regulating lead and insulating wooden pieces are disassembled and fixed as a whole on a lead disassembly and transportation bracket, and then fixed to a transportation cover together with a supporting cushion by a locking device, and then transported to the installation site together with the transformer body.

[0006] The lead removal process includes the following steps:

[0007] Step 1): Remove the external accessories of the transformer body, drain the oil in the oil tank, lift out the transformer body, and remove the no-load switch;

[0008] Step 2): Remove the insulation and shielding at the connection between the upper lead STT terminal and the lower lead STT terminal, and loosen the connecting bolts;

[0009] Step 3): Lift the lead assembly and transport bracket to the insulating wooden pieces of the high-voltage lead and the voltage regulating lead and place it close to the wooden pieces. After the position is determined, use a lock to secure the lead assembly and transport bracket to the high-voltage lead, the voltage regulating lead, and the insulating wooden pieces.

[0010] Step 4): Remove the high-voltage lead, voltage regulating lead and the connection between the insulating wood and the transformer body respectively;

[0011] Step 5): Lift the disassembled high-voltage lead, voltage regulating lead, insulating wood pieces and lead disassembly and transportation bracket above the transportation cover, place the lead disassembly and transportation bracket on the mat and secure it with a locker;

[0012] Step 6): The high-voltage lead, voltage regulating lead and insulating wood pieces are transported together with the transformer body to the dismantled transformer installation site.

[0013] The size of the lead assembly and disassembly transport bracket is determined according to the wiring size of the high-voltage lead, thereby ensuring that the insulation distance from the high-voltage lead to the metal part remains consistent with that at the factory.

[0014] The lead assembly and disassembly transport bracket includes a bracket body and an auxiliary support frame installed on the bracket body, wherein the bracket body is used to fix the high-voltage lead and the insulating wooden piece; the auxiliary support frame is used to fix the voltage regulating lead and keep the wiring position of the voltage regulating lead unchanged.

[0015] In step 4) of the lead disassembly and assembly, the auxiliary support frame is first installed on the bracket body; then the high-voltage leads on the upper part of the three-core high-voltage coils, the connection between the voltage regulating leads and the transformer body, the high-voltage leads on the lower part of the three-core high-voltage coils, the connection between the voltage regulating leads and the transformer body, and the connection between the insulating wooden pieces on the upper and lower parts of the high-voltage coils and the transformer body are disassembled in sequence.

[0016] The upper lead STT terminal and the lower lead STT terminal both include a high-voltage lead STT terminal and a voltage-regulating lead STT terminal.

[0017] The lead field installation includes the following steps:

[0018] Step 1): After the transformer body is in place, lift the lead assembly and transport bracket and the high-voltage lead and voltage regulating lead on it as a whole, keeping the high-voltage lead facing the side of the transformer body, and connect the high-voltage lead, voltage regulating lead and insulating wood parts to the transformer body;

[0019] Step 2): After the lead wires are installed, remove the locking belt between the high-voltage lead wire and the lead wire disassembly and transportation bracket, remove the auxiliary support frame, and lift the lead wire disassembly and transportation bracket away from the transformer body. The entire high-voltage lead and voltage regulating lead installation process is completed.

[0020] The connection process of the high-voltage lead, voltage regulating lead and insulating wooden pieces is: first connect the STT terminals of the high-voltage lead and voltage regulating lead and wrap them with insulation, then complete the connection of the high-voltage lead and voltage regulating lead on the upper part of the three-core high-voltage coil with the transformer body, the connection of the high-voltage lead and voltage regulating lead on the lower part of the three-core high-voltage coil with the transformer body, and the connection of the insulating wooden pieces on the upper and lower parts of the high-voltage coil with the transformer body.

[0021] The advantages and beneficial effects of the present invention are:

[0022] The present invention greatly improves the working efficiency of disassembling and reinstalling the high-voltage lead, and the modular disassembly and assembly method is not likely to cause loss and damage of insulating parts.

[0023] The present invention can not only reduce the wiring work of on-site installation of the lead wire, but also ensure that the insulation distance between the lead wire and the metal part remains consistent with that at the factory, thereby ensuring the performance of the disassembled transformer product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an application diagram of the lead wire disassembly and transportation bracket of the present invention;

[0025] Figure 2 for Figure 1 A top view of

[0026] Figure 3 This is a schematic structural diagram of the lead wire disassembly and transportation bracket of the present invention;

[0027] Figure 4 for Figure 3 Left view of;

[0028] Figure 5 It is a structural schematic diagram of the stool in the present invention.

[0029] In the figure: 1 is the bracket body, 2 is the auxiliary support frame, 3 is the insulating wooden piece, 4 is the cushion, 5 is the transformer body, 6 is the upper lead STT terminal, and 7 is the lower lead STT terminal. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] The present invention provides a method for disassembling and transporting the leads of a dismantled transformer as a whole, which includes lead disassembly and transportation and lead on-site installation; wherein the lead disassembly and transportation adopts an integral transportation method, and the high-voltage lead, voltage-regulating lead and insulating wooden parts are fixed as a whole on a lead disassembly and transportation bracket after disassembly, and then fixed to a transportation cover together with a support cushion through a locker, and then transported to the installation site together with the transformer body.

[0032] like Figure 1-2 As shown, in the embodiment of the present invention, the lead disassembly and transportation process includes the following steps:

[0033] Step 1): After the transformer is disassembled and tested and found to be qualified, the product is transported out of the test hall, the external accessories of the transformer body 5 are disassembled, the oil tank is drained, the transformer body 5 is lifted out and the no-load switch is disassembled. After the disassembly is completed, the lead wires and insulating wood parts are prepared for removal;

[0034] Step 2): Before disassembling the entire lead, first remove the insulation and shielding at the connection between the upper lead STT terminal 6 and the lower lead STT terminal 7, and loosen the connecting bolts; specifically, the upper lead STT terminal 6 and the lower lead STT terminal 7 include a high-voltage lead STT terminal and a voltage regulating lead STT terminal; specifically, a total of six STT terminal connections need to be disassembled;

[0035] Step 3): Lift the lead assembly and transport bracket to the position of the insulating wooden piece 3 of the high-voltage lead and the voltage regulating lead and close to the insulating wooden piece 3. After the position is determined, use a locker to fix the lead assembly and transport bracket to the high-voltage lead, the voltage regulating lead and the insulating wooden piece 3;

[0036] Specifically, after the lead disassembly and transportation bracket is lifted to the position of the wooden pieces for the high-voltage lead and the voltage-regulating lead and pressed against the wooden pieces, the bolt holes on the lead disassembly and transportation bracket for fixing the auxiliary support frame 2 are located outside the voltage-regulating lead between the B-pillar and the C-pillar, so as to facilitate the fixing of the auxiliary support frame 2; the height direction is consistent with the voltage-regulating insulating wooden piece, and after the position is determined, the lead disassembly and transportation bracket is fixed to the lead and the insulating wooden piece with a locker; during the fixing process, the crane must be kept in a lifting state so that the weight of the lead disassembly and transportation bracket itself is borne by the crane to avoid the lead disassembly and transportation bracket being too heavy and damaging the lead and the insulating wooden piece;

[0037] Step 4): Disassemble the high-voltage lead, the voltage regulating lead and the connection between the insulating wood piece 3 and the transformer body 5 respectively;

[0038] Step 5): Lift the disassembled high-voltage lead, voltage regulating lead, insulating wood piece 3 and lead disassembly and transportation bracket as a whole above the transportation cover, keeping the lead part facing upward, and place the lead disassembly and transportation bracket as a whole on the mat 4 and secure it with a locker;

[0039] Step 6): The high-voltage lead, the voltage-regulating lead and the insulating wooden piece 3 are transported together with the transformer body 5 to the dismantled transformer installation site.

[0040] In this embodiment, the size of the lead assembly and disassembly transport bracket is determined according to the wiring size of the high-voltage lead, thereby ensuring that the insulation distance from the high-voltage lead to the metal parts remains consistent with that at the factory. Figure 3-4As shown, the lead disassembly and transportation bracket includes a bracket body 1 and an auxiliary support frame 2 installed on the bracket body 1, wherein the bracket body 1 is used to fix the high-voltage lead and the insulating wooden piece; the auxiliary support frame 2 is used to fix the voltage-regulating lead and keep the wiring position of the voltage-regulating lead unchanged.

[0041] Specifically, in step 4), before officially starting to disassemble the leads and insulating wood pieces, first install the auxiliary support frame 2 on the bracket body 1; then sequentially disassemble the high-voltage leads on the upper parts of the three-core high-voltage coils, the connection between the voltage-regulating leads and the transformer body 5, the high-voltage leads on the lower parts of the three-core high-voltage coils, the connection between the voltage-regulating leads and the transformer body 5, and the connection between the insulating wood pieces 3 on the upper and lower parts of the high-voltage coils and the transformer body 5; after disassembling all the leads and insulating wood piece connections, separate the leads from the transformer body 5, and use the shrink band again to fix the disassembled leads and insulating wood pieces to the lead disassembly and transportation bracket; the wiring position of the voltage-regulating leads must be fixed to the auxiliary support frame 2 at least at four places to ensure that the relative position of the voltage-regulating leads remains unchanged. During the entire disassembly operation, the crane always maintains the lifting state of the lead disassembly and transportation bracket. After the disassembly work is completed, the weight of the leads, insulating wood pieces, and the lead disassembly and transportation bracket is all borne by the lifting rope to ensure that the wired leads are not deformed by external forces.

[0042] The above steps are the lead wire disassembly process in the factory. The entire process must ensure that the wiring shape and relative position of the tested leads remain unchanged.

[0043] The on-site installation of the leads includes the following steps:

[0044] Step 1): After the transformer body is in place, lift the lead assembly and transport bracket and the high-voltage lead and voltage regulating lead on it as a whole, keeping the high-voltage lead facing the side of the transformer body, and connect the high-voltage lead, voltage regulating lead and insulating wood piece 3 to the transformer body 5;

[0045] Specifically, first connect the STT terminals of the high-voltage lead and the voltage-regulating lead and wrap them with insulation, and then complete the connection of the upper ends of the three-core high-voltage coils and the voltage-regulating lead to the transformer body 5, the connection of the lower ends of the three-core high-voltage coils and the voltage-regulating lead to the transformer body 5, and the connection of the upper and lower insulating wooden pieces of the high-voltage coil to the transformer body 5 in sequence, and connect all the leads and insulating wooden pieces. During this process, the lifting rope always holds the entire lead disassembly and assembly transportation bracket and the lead.

[0046] Step 2): After the lead wires are installed, remove the locking belt between the high-voltage lead wire and the lead wire disassembly and transportation bracket, remove the auxiliary support frame 2, and lift the lead wire disassembly and transportation bracket away from the transformer body 5. The entire high-voltage lead wire and voltage regulating lead wire installation process is completed.

[0047] The connection process of the high-voltage lead, the voltage regulating lead and the insulating wooden piece 3 is: first connect the STT terminals of the high-voltage lead and the voltage regulating lead and wrap them with insulation, and then complete the connection of the high-voltage lead and the voltage regulating lead on the upper part of the three-core high-voltage coil with the transformer body 5, the connection of the high-voltage lead and the voltage regulating lead on the lower part of the three-core high-voltage coil with the transformer body 5, and the connection of the insulating wooden pieces 3 on the upper and lower parts of the high-voltage coil with the transformer body 5.

[0048] In this embodiment, the lead assembly and transport bracket is made of 50×50×4 square steel tube. The size of the lead assembly and transport bracket is determined according to the wiring size of the high-voltage lead. The auxiliary support frame 2 is connected to the bracket body 1 by bolts; Figure 5 As shown, the bench 4 is a square structure made of 50×50 angle steel. The leads are transported as a whole. The high-voltage leads, voltage-regulating leads, and insulating wooden pieces are fixed to the lead assembly and transport bracket. They are then secured to the temporary transport cover of the transformer body 5 with a locker, along with the support bench, and transported together to the installation site.

[0049] The method of the present invention greatly improves the efficiency of disassembling and reinstalling high-voltage leads, and the modular disassembly and assembly method is not likely to cause loss or damage to insulating parts. The method can not only reduce the wiring work of on-site installation of leads, but also ensure that the insulation distance from the leads to metal parts remains consistent with that at the factory, thereby ensuring the performance of the disassembled transformer product.

[0050] The above description is only an embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the present invention are included in the scope of protection of the present invention.

Claims

1. A method for disassembling and transporting the entire lead wire of a disassembled transformer, characterized in that: The method includes lead disassembly and transportation and lead on-site installation; wherein the lead disassembly and transportation adopts an integral transportation mode, wherein the high-voltage lead, voltage regulating lead and insulating wooden pieces are disassembled and fixed as a whole on a lead disassembly and transportation bracket, and then fixed together with a support cushion by a locker on a transportation cover, and then transported together with the transformer body to the installation site; The lead removal process includes the following steps: Step 1): Remove the external accessories of the transformer body, drain the oil in the oil tank, lift out the transformer body, and remove the no-load switch; Step 2): Remove the insulation and shielding at the connection between the upper lead STT terminal and the lower lead STT terminal, and loosen the connecting bolts; Step 3): Lift the lead assembly and transport bracket to the insulating wooden pieces of the high-voltage lead and the voltage regulating lead and place it close to the wooden pieces. After the position is determined, use a lock to secure the lead assembly and transport bracket to the high-voltage lead, the voltage regulating lead, and the insulating wooden pieces. Step 4): Remove the high-voltage lead, voltage regulating lead and the connection between the insulating wood and the transformer body respectively; Step 5): Lift the disassembled high-voltage lead, voltage regulating lead, insulating wood pieces and lead disassembly and transportation bracket above the transportation cover, place the lead disassembly and transportation bracket on the mat and secure it with a locker; Step 6): The high-voltage lead, voltage regulating lead and insulating wood pieces are transported together with the transformer body to the dismantling transformer installation site; The size of the lead assembly and disassembly transport bracket is determined according to the wiring size of the high-voltage lead, thereby ensuring that the insulation distance from the high-voltage lead to the metal parts remains consistent with that at the factory; The lead field installation includes the following steps: Step 1): After the transformer body is in place, lift the lead assembly and transport bracket and the high-voltage lead and voltage regulating lead on it as a whole, keeping the high-voltage lead facing the side of the transformer body, and connect the high-voltage lead, voltage regulating lead and insulating wood parts to the transformer body; Step 2): After the lead wires are installed, remove the locking belt between the high-voltage lead wire and the lead wire disassembly and transportation bracket, remove the auxiliary support frame, and lift the lead wire disassembly and transportation bracket away from the transformer body. The entire high-voltage lead and voltage regulating lead installation process is completed.

2. The method for disassembling and transporting the lead wires of a disassembled transformer according to claim 1, characterized in that: The lead assembly and disassembly transport bracket includes a bracket body and an auxiliary support frame installed on the bracket body, wherein the bracket body is used to fix the high-voltage lead and the insulating wooden piece; the auxiliary support frame is used to fix the voltage regulating lead and keep the wiring position of the voltage regulating lead unchanged.

3. The method for disassembling and transporting the lead wires of a disassembled transformer according to claim 2, characterized in that: In step 4) of the lead disassembly and assembly, the auxiliary support frame is first installed on the bracket body; then the high-voltage leads on the upper part of the three-core high-voltage coils, the connection between the voltage regulating leads and the transformer body, the high-voltage leads on the lower part of the three-core high-voltage coils, the connection between the voltage regulating leads and the transformer body, and the connection between the insulating wooden pieces on the upper and lower parts of the high-voltage coils and the transformer body are disassembled in sequence.

4. The method for disassembling and transporting the lead wires of a disassembled transformer according to claim 1, characterized in that: The upper lead STT terminal and the lower lead STT terminal both include a high-voltage lead STT terminal and a voltage-regulating lead STT terminal.

5. The method for disassembling and transporting the lead wires of a disassembled transformer according to claim 1, characterized in that: The connection process of the high-voltage lead, voltage regulating lead and insulating wooden pieces is: first connect the STT terminals of the high-voltage lead and voltage regulating lead and wrap them with insulation, then complete the connection of the high-voltage lead and voltage regulating lead on the upper part of the three-core high-voltage coil with the transformer body, the connection of the high-voltage lead and voltage regulating lead on the lower part of the three-core high-voltage coil with the transformer body, and the connection of the insulating wooden pieces on the upper and lower parts of the high-voltage coil with the transformer body.

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