A coupling correction method for transformer clamp force, deformation and noise control

Abstract

The present invention is a coupled correction method for transformer clamp force, deformation and noise control, which mainly solves the comprehensive calculation ability of existing clamps and fasteners, noise and self-structural stability. It includes calculation paths, logical processes, target guidance, joint analysis, etc., which can realize process-based mechanical analysis and control under different clamp structures. It has important numerical guidance significance for standardizing noise test states and deformation control of clamps, making the entire transformer clamp fastening process have normative value and scientific rationality, and at the same time has theoretical significance and execution benchmark. The advantages of the present invention: through reasonable and standardized calculation logic, the calculation connection between the three aspects of clamp force, deformation and noise is constructed, and the numerical matching of fasteners, deformation degree and noise conditions under stable surface pressure is realized, which has important guiding significance and value in mechanical analysis, process reference, application control, error correction and precise testing.

Description

Technical Field

[0001] The present invention relates to a coupling correction method for force, deformation and noise control of transformer clamps, and in particular to a coupling correction logic for force, deformation and noise control of transformer core clamps. Background Art

[0002] Transformer core clamps come in a variety of designs, and the types and sizes of fasteners used are also diverse. For different fastener and clamp structures, it is necessary to determine the appropriate tightening torque to match the stable surface pressure under different core structures.

[0003] At the same time, the deformation of different clamps under different stress conditions also needs to be controlled. If inappropriate fastener size and torque are selected, plastic deformation of the clamp will occur, and in severe cases, deformation of the protruding section of the clamp will occur.

[0004] In addition, the preload state of the clamp is closely related to the noise. Balancing the preload state of the clamp to achieve a stable surface pressure is of great significance for controlling noise.

[0005] In the existing technology, the selection of clamps and fasteners is based on experience or inherent references, lacking a theoretical calculation system and judgment standards. Fasteners are mostly tightened by direct operation, lacking data analysis and comprehensive consideration of rational selection. The deformation of the clamps and noise performance are not taken into account, and there is no complete calculation logic as numerical support. Summary of the Invention

[0006] The present invention proposes a coupling correction method for transformer clamp force, deformation and noise control, which aims to fill the above-mentioned gaps in the existing technology and achieve the numerical matching of fasteners, deformation degree and noise conditions under stable surface pressure.

[0007] The technical solution of the present invention mainly solves the comprehensive calculation capability of existing clamps and fasteners with noise and their own structural stability, including calculation path, logical process, target guidance, joint analysis, etc., which can realize process-based mechanical analysis and control under different clamp structures, and has important numerical guidance significance for standardizing noise test status and clamp deformation control, making the entire transformer clamp fastening process have normative value and scientific rationality, and at the same time has theoretical significance and implementation benchmark. Specifically,

[0008] A coupling correction method for transformer clamp force and deformation and noise control includes the following steps:

[0009] 1) Based on the default main stage surface pressure of 0.15MPa, the main stage bearing capacity is calculated to determine the design of the through screw, and different force distribution principles are differentiated. At the same time, feedback analysis is performed based on different distribution methods for a single distribution principle to calculate and output the screw force, screw strength, and screw torque;

[0010] 2) Conduct feedback analysis based on allowable conditions to confirm that all screw and related parameters meet the requirements of the material and structure ends;

[0011] 3) To confirm the screw and related forces to advance the deflection calculation logic;

[0012] 4) Using the nominal diameter of the side screw, the distance between the cantilever beam support points, the material elastic modulus, and the clamp force as input parameters, a differentiated verification is performed on the clamp structure, including L-shaped bends, U-shaped bends, channel steel parts, and steel plate clamps. For channel steel parts and U-shaped bends, the approximate channel steel calculation method is used;

[0013] 5) Logically calculate the static moment and moment of inertia, and confirm the centroid position;

[0014] 6) Using all the output values ​​from the above two steps, logically advance the deflection curve equation and the end interface angle, and select the deflection value and corresponding screw hole position that meet the requirements;

[0015] 7) Based on all the above output parameters, conduct noise standardization test, control 10 measuring points in horizontal state, perform reverse calculation of surface pressure based on distribution methods under different force distribution principles, adjust surface pressure cyclically, run logic test, use transformer core capacity as differentiation basis, feedback correction, and output optimal surface pressure parameters;

[0016] 8) Based on the above parameters, a series of noise tests were conducted. The longitudinal state was controlled according to the national standard at 12 measuring points. Based on the distribution method under different force distribution principles, the surface pressure was reversely controlled. The self-inductance magnetic field intensity was used as the scale to measure and control the section noise.

[0017] 9) Based on the relationship between serialized surface pressure and capacity, the mechanical feedback and deflection feedback calculations are re-completed, the criteria are revised, and the self-control and mutual regulation of each process quantity are realized.

[0018] The advantages of the present invention are: through reasonable and standardized calculation logic, the calculation connection between the clamp force, deformation and noise is established, and the numerical matching of the fastener, deformation degree and noise conditions under stable surface pressure is achieved. It has important guiding significance and value in mechanical analysis, process reference, application control, error correction and precision testing. Specifically:

[0019] 1) Complete specifications and guidelines for the transformer clamp fastening process have been formed, establishing an overall relationship between fastener preload, multi-fastener full force distribution, clamp extension section deformation control, and noise verification control, thus achieving multi-position feedback and correction;

[0020] 2) An overall logical judgment was made for the tightening process of transformer clamps, including primary surface pressure, force distribution criteria, fastener selection, and elastic deformation of the clamp extension section, logically analyzing the relationship between parameter variables.

[0021] 3) Based on the noise test analysis, the same-level feedback, upper-level feedback and lower-level correction are realized, and the noise standard is used as the judgment criterion to construct the interlocking and correction of the calculation logic, thereby enhancing the adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a flow chart of the calculation system of the screw mechanics part in the present invention.

[0023] Figure 2 It is a flow chart of the calculation system of the anti-bending deformation part in the present invention.

[0024] Figure 3 It is a flow chart of the noise and mechanics calculation system in the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to examples and specific implementation methods.

[0026] Example

[0027] The installation process of the power transformer's own clamps.

[0028] Power transformer clamps are divided into upper and lower, high and low voltage sides. The installation process relies on fasteners to control the clamping state. The installation process involves preload, structural deformation, gap control, and balance analysis, which directly affect the key noise performance indicators of the transformer core structure. Effective control and corrective analysis logic can achieve performance optimization.

[0029] This correction method can establish a joint control of force, deformation, and noise performance based on the preset surface pressure through multiple independent calculations and feedback mechanisms. At the same time, multiple internal logics involve judgment and correction, and adapt to different structural properties through loops and conditional classification. Its main execution process includes the following steps:

[0030] 1) If Figure 1 As shown, based on the default main stage surface pressure of 0.15MPa, the main stage bearing capacity is calculated, the design of the through screw is judged, different force distribution principles are differentiated, and feedback analysis is performed based on different distribution methods for a single distribution principle. The screw force, screw strength and screw torque are calculated and output. Specifically:

[0031] ①The surface pressure control is preset to 0.15MPa, and the main stage area is calculated.

[0032] ② Calculate the main stage sheet size to obtain the main stage area calculation sub-table, calculate the main stage bearing capacity to obtain the main stage bearing capacity calculation sub-table,

[0033] ③ Determine whether there is a through-screw. If not, obtain the variable area according to the first distribution principle of the force at different positions of the core and proceed to step ④. If yes, obtain the variable area according to the second distribution principle of the force at different positions of the core and proceed to step ⑤.

[0034] ④ Calculate the side screw distribution force, calculate the side screw torque to obtain the output value and judge whether it exceeds the allowable strength. If not, calculate the torque and obtain the output value. If so, change the screw grade to obtain the output value, change the screw size to obtain the variable area, and recalculate the side screw distribution force.

[0035] ⑤ Calculate the through screw distribution force and the side screw distribution force, and then determine whether the allowable strength is reached. If not, calculate the through screw torque and the side screw torque respectively and obtain the output value. If so, proceed to step 2);

[0036] 2) Conduct feedback analysis based on the allowable conditions to confirm that all screw and related parameters meet the requirements of the material and structure ends, specifically:

[0037] Adjust the screw selection requirements, change the screw material strength grade and calculate the material strength and allowable strength, change the screw size parameters and calculate the allowable strength under the new size, and then repeat step 1)⑤ to determine whether the allowable strength is reached;

[0038] 3) To confirm the screw and related forces to advance the deflection calculation logic, specifically:

[0039] The side screw distribution force calculated in step 1) ④, the through screw distribution force calculated in step 1) ⑤, and the side screw distribution force are all recorded in the deflection calculation sub-table. The clamp structure is confirmed according to the deflection calculation sub-table, and step 4) is performed;

[0040] 4) If Figure 2 As shown in the figure, the nominal diameter of the side screw, the distance between the cantilever beam support points, the elastic modulus of the material, and the force on the clamp are used as input parameters. At the same time, differentiated verification is performed on the clamp structure, including L-shaped bending parts, U-shaped bending parts, channel steel parts and steel plate clamps. The approximate channel steel calculation method is used for channel steel parts and U-shaped bending parts. Specifically:

[0041] ① Input the nominal diameter D of the side screw, the distance L between the side screw hole of the clamp and the cantilever beam support point, the elastic modulus E of the material, the moment of inertia I, and the force F of the clamp and get the output value.

[0042] ② According to the different clamp structures, L-shaped bending parts and steel plate clamps can be directly processed into step 5), U-shaped bending parts can be calculated based on the approximate channel steel and then into step 5), and channel steel parts can be calculated based on the channel steel and then into step 5.

[0043] 5) Logically calculate the static moment and moment of inertia, and confirm the centroid position. Specifically:

[0044] The static moment of L-shaped bending parts and steel plate clamps is calculated directly. The static moment of U-shaped bending parts is calculated based on the approximate channel steel and the channel steel parts are calculated based on the channel steel calculation. The static moment refers to the moment of gravity on the axis of rotation. Then the centroid and moment of inertia are calculated, which refers to the moment of inertia force on a certain axis of rotation.

[0045] 6) Using all the output values ​​from the above two steps, logically advance the deflection curve equation and the end interface angle, and select the deflection value and the corresponding screw hole position that meet the requirements. Specifically:

[0046] Combined with the output value of step 4)① and the centroid and moment of inertia of step 5), the deflection curve equation is calculated to obtain the output value, and then the end interface angle is calculated to obtain the output value, and then the maximum deflection is calculated to obtain the output value.

[0047] 7) If Figure 3 As shown, based on all the above output parameters, a noise standardization test is performed, 10 measuring points are controlled in a horizontal state, the surface pressure is reversely calculated based on the distribution method under different force distribution principles, the surface pressure is cyclically adjusted, and a logic test is performed. The transformer core capacity is used as the basis for differentiation, feedback correction is performed, and the optimal surface pressure parameters are output. Specifically:

[0048] ① Carry out 10-point core horizontal state noise test, comprehensively control the main stage surface pressure according to the control factors to proceed to step ②, and the second distribution principle of the core force at different positions to proceed to step ③,

[0049] ②The main stage surface pressure gradient is adjusted to 0.1-0.5, and the cyclic surface pressure test is fed back to step ③, and adapted to different transformer core capacities to output the optimal surface pressure.

[0050] ③ Determine whether the side screw is greater than or less than the through screw, obtain the change in noise balance, and obtain the force of different secondary surface pressures, that is, the weight of the clamp and the weight of the small stage. Then calculate the actual surface pressure and feed it back to step 7) ② to adapt to different transformer core capacities. At the same time, step 7) ② is used to calculate the force of different secondary surface pressures based on the adaptation of different transformer core capacities.

[0051] 8) Based on the above parameters, a series of noise tests were conducted. The longitudinal state was controlled according to the national standard at 12 measuring points. Based on the distribution method under different force distribution principles, the surface pressure was reversely controlled. The self-inductance magnetic field strength was used as the scale to measure and control the section noise. Specifically,

[0052] ① Different designed magnetic density segments 1.2-1.9 and 1.6-1.8 are subdivided into regions, and the output values ​​are obtained, and steps ② and ③ are performed respectively.

[0053] ② Carry out 12-point core installation state noise test to examine noise imbalance, analyze A-weighted sound pressure level noise, and output the optimal surface pressure.

[0054] ③According to the control factors, comprehensively control the main stage surface pressure to proceed to step ④, and the second distribution principle of the force at different positions of the core to proceed to step ⑤,

[0055] ④The main stage surface pressure gradient is adjusted to 0.1-0.5, and the cyclic surface pressure test is fed back to step ⑤, and adapted to different transformer core capacities to output the optimal surface pressure.

[0056] ⑤ Determine whether the side screw is greater than or less than the through screw, test the noise of different magnetic density sections, and output the optimal surface pressure;

[0057] 9) Based on the relationship between serialized surface pressure and capacity, the mechanical feedback and deflection feedback calculations are re-completed, the criteria are revised, and the self-control and mutual regulation of each process quantity are realized.

[0058] Based on the above execution steps, screw selection, torque confirmation, thickness change, noise optimization, optimal surface pressure, optimal elastic deformation, and plastic deformation elimination can be achieved. The secondary installation of clamps and the initial installation of accessories can be controlled through effective logic and methods, which is of great significance for maintaining the assembly stability and identity of batch transformer cores.

[0059] The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the creative concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A coupling correction method for transformer clamp force, deformation and noise control, characterized in that: The following steps are involved: 1) Based on the default main stage surface pressure of 0.15MPa, the main stage bearing capacity is calculated to determine the design of the through screw, differentiate different force distribution principles, and conduct feedback analysis based on different distribution methods for a single distribution principle to calculate and output the screw force, screw strength, and screw torque; 2) Conduct feedback analysis based on allowable conditions to confirm that all screw and related parameters meet the requirements of the material and structure ends; 3) Confirm the screw and related forces to advance the deflection calculation logic; 4) Using the nominal diameter of the side screw, the distance between the cantilever beam support points, the material elastic modulus, and the clamp force as input parameters, a differentiated verification is performed on the clamp structure, including L-shaped bends, U-shaped bends, channel steel parts, and steel plate clamps. For channel steel parts and U-shaped bends, the approximate channel steel calculation method is used; 5) Logically calculate the static moment and moment of inertia, and confirm the centroid position; 6) Using the nominal diameter of the side screw, the distance between the cantilever beam support points, the elastic modulus of the material, the force on the clamp, the static moment of the clamp, the moment of inertia and the centroid position as input parameters, the deflection curve equation and the end interface angle are logically advanced to select the required deflection value and the corresponding screw hole position; 7) Based on the default main stage surface pressure, screw torque, deflection value and screw hole position, a noise standardization test is performed. 10 measuring points are controlled in a horizontal state. Based on the distribution method under different force distribution principles, the surface pressure is reversely calculated, the surface pressure is cyclically adjusted, and a logic test is performed. The transformer core capacity is used as the basis for differentiation, feedback correction is performed, and the optimal surface pressure parameters are output; 8) Based on the default main stage surface pressure, screw torque, deflection value and screw hole position, a series of noise tests are carried out. The longitudinal state is controlled according to the national standard at 12 measuring points. Based on the distribution method under different force distribution principles, the surface pressure is reversely controlled. The self-inductance magnetic field strength is used as a scale to measure and control the section noise. 9) Based on the relationship between serialized surface pressure and capacity, the mechanical feedback and deflection feedback calculations are re-completed, the criteria are revised, and the self-control and mutual regulation of each process quantity are achieved.

2. A method for coupling correction of transformer clamp force, deformation and noise control according to claim 1, characterized in that: The step 1) specifically includes: ①The surface pressure control is preset to 0.15MPa, and the main stage area is calculated. ② Calculate the main stage sheet size to obtain the main stage area calculation sub-table, calculate the main stage bearing capacity to obtain the main stage bearing capacity calculation sub-table, ③ Determine whether there is a through-screw. If not, obtain the variable area according to the first distribution principle of the force at different positions of the core and proceed to step ④. If yes, obtain the variable area according to the second distribution principle of the force at different positions of the core and proceed to step ⑤. ④ Calculate the side screw distribution force, calculate the side screw torque to obtain the output value and judge whether it exceeds the allowable strength. If not, calculate the torque and obtain the output value. If so, change the screw grade to obtain the output value, change the screw size to obtain the variable area, and recalculate the side screw distribution force. ⑤ Calculate the distribution force of the through screw and the distribution force of the side screw, and then determine whether the allowable strength is reached. If not, calculate the through screw torque and the side screw torque respectively and obtain the output value. If so, proceed to step 2).

3. A method for coupling correction of transformer clamp force, deformation and noise control according to claim 2, characterized in that: The step 2) specifically includes: adjusting the screw selection requirements, changing the screw material strength grade and calculating the material strength and allowable strength, and changing the screw size parameters and calculating the allowable strength under the new size, and then re-performing step 1) ⑤ to determine whether the allowable strength is reached.

4. A method for coupling correction of transformer clamp force, deformation and noise control according to claim 3, characterized in that: The step 3) specifically includes: calculating the side screw distribution force in step 1) ④, calculating the through screw distribution force and the side screw distribution force in step 1) ⑤, recording them in the deflection calculation sub-table, confirming the clamp structure according to the deflection calculation sub-table, and proceeding to step 4).

5. The method for coupling correction of transformer clamp force, deformation and noise control according to claim 4, characterized in that: The step 4) specifically includes: ① Input the nominal diameter of the side screw, the distance from the side screw hole of the clamp to the cantilever beam support point, the material elastic modulus, the moment of inertia, and the clamp force and get the output value. ② Confirm according to different clamp structures. For L-shaped bending parts and steel plate clamps, proceed directly to step 5). For U-shaped bending parts, calculate the approximate channel steel first and then proceed to step 5). For channel steel parts, calculate the channel steel first and then proceed to step 5).

6. A method for coupling correction of transformer clamp force, deformation and noise control according to claim 5, characterized in that: The step 5) specifically includes: directly calculating the static moment of the L-shaped bending parts and the steel plate clamps, calculating the static moment of the U-shaped bending parts based on the approximate channel steel and calculation, and calculating the static moment of the channel steel parts based on the channel steel calculation. The static moment refers to the moment of gravity on the rotating axis, and then calculating the centroid and moment of inertia, which refers to the moment of inertia force on a certain rotating axis.

7. A method for coupling correction of transformer clamp force, deformation and noise control according to claim 6, characterized in that: The step 6) specifically includes: combining the output value of step 4) ① and the centroid and moment of inertia of step 5), calculating the deflection curve equation to obtain the output value, then calculating the end interface angle to obtain the output value, and then calculating the maximum deflection to obtain the output value.

8. The method for coupling correction of transformer clamp force, deformation and noise control according to claim 7, characterized in that: The step 7) specifically includes: ① Carry out 10-point core horizontal state noise test, comprehensively control the main stage surface pressure according to the control factors to proceed to step ②, and the second distribution principle of the core force at different positions to proceed to step ③, ②The main stage surface pressure gradient is adjusted to 0.1-0.5, and the cyclic surface pressure test is fed back to step ③, and adapted to different transformer core capacities to output the optimal surface pressure. ③ Determine whether the side screw is greater than or less than the through screw, obtain the change in noise balance, and obtain the force of different secondary surface pressures, that is, the weight of the clamp and the weight of the small stage. Then calculate the actual surface pressure and feed it back to step 7) ② to adapt to different transformer core capacities. At the same time, step 7) ② is used to calculate the force of different secondary surface pressures by adapting to different transformer core capacities.

9. The method for coupling correction of transformer clamp force, deformation and noise control according to claim 8, characterized in that: The step 8) specifically includes: ① Different designed magnetic density segments 1.2-1.9 and 1.6-1.8 are subdivided into regions, and the output values ​​are obtained, and steps ② and ③ are performed respectively. ② Carry out 12-point core installation state noise test to examine noise imbalance, analyze A-weighted sound pressure level noise, and output the optimal surface pressure. ③According to the control factors, comprehensively control the main stage surface pressure to proceed to step ④, and the second distribution principle of the force at different positions of the core to proceed to step ⑤, ④The main stage surface pressure gradient is adjusted to 0.1-0.5, and the cyclic surface pressure test is fed back to step ⑤, and adapted to different transformer core capacities to output the optimal surface pressure. ⑤ Determine whether the side screw is greater than or less than the through screw, test the noise of different magnetic density segments, and output the optimal surface pressure.

Images