CN111209691A - Dynamic mechanical characteristic analysis method and computer readable medium of transformer substation sleeve system - Google Patents
Dynamic mechanical characteristic analysis method and computer readable medium of transformer substation sleeve system Download PDFInfo
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Abstract
A dynamic mechanical characteristic analysis method for a transformer substation bushing system belongs to the field of transformer substation facility bearing characteristic analysis. It includes: acquiring a transformer substation sleeve system assembly model capable of inputting mechanical analysis software, wherein the transformer substation sleeve system assembly model can express the mechanical action relation among parts; loading an external dynamic load for simulating environmental disturbance in mechanical analysis software, and solving the dynamic response of the transformer substation sleeve system assembly model under the action of the external dynamic load; the external dynamic load comprises a wind field dynamic load; and acquiring dynamic mechanical characteristic data of the transformer substation sleeve system assembly model output by the mechanical analysis software. By adopting the method, the dynamic bearing characteristic data of the transformer substation bushing system can be accurately and comprehensively acquired under the condition of wasting few resources. The invention also discloses a computer readable medium storing the dynamic mechanical characteristic analysis program of the transformer substation bushing system, which comprises an input module, a mechanical analysis module and an output module.
Description
Technical Field
The invention relates to the technical field of analysis of bearing characteristics of transformer substation facilities, in particular to a dynamic mechanical characteristic analysis method of a transformer substation bushing system and a computer readable medium storing a dynamic mechanical characteristic analysis program of the transformer substation bushing system.
Background
Under the influence of severe weather such as ice, snow, strong wind and the like, phenomena such as wind vibration, galloping, ice (snow) removal jumping and the like easily occur on an overhead line which is in service in a field open environment, and dynamic impact load generated by the phenomena is applied to a fixed line rod through movable connecting parts such as insulators, hardware fittings and the like, so that the movable connecting parts are damaged by fatigue, deformed by buckling or broken. If the movable connecting member is deformed by buckling or broken, the insulation and sealing performance of the movable connecting member are generally reduced or deteriorated.
In high-voltage transmission transformer engineering, a transformer, a main transformer bushing and a lightning arrester are indispensable important components in the whole transmission system. When the overline and the down conductor of the high-voltage substation are affected by severe weather such as ice, snow, strong wind, etc., large displacement may occur along with phenomena such as wind vibration, waving, ice (snow) jumping, etc. After the dynamic impact load caused by the dynamic impact load acts on the end part of the main transformer sleeve, the fatigue damage, buckling deformation or breakage of the main transformer sleeve and the hardware fitting can be caused, the reduction or failure of the insulativity and the sealing performance of related equipment can be caused, and if the faults such as poor grounding, oil leakage, water inflow and the like are met, the faults of an electric appliance can be caused. These problems will seriously affect the operational safety and power supply reliability of the line.
At present, the research on the dynamic bearing characteristics of a transformer substation lead, overline and sleeve end system directly based on a field test has the problems of high cost, difficulty in test adjustment, limited data acquisition and the like.
Disclosure of Invention
The invention aims to provide a dynamic mechanical characteristic analysis method of a transformer substation bushing system, so as to accurately and comprehensively acquire dynamic bearing characteristic data of the transformer substation bushing system.
In order to solve the technical problems, the following technical scheme can be selected according to the needs:
a dynamic mechanical characteristic analysis method of a transformer substation sleeve system comprises an insulator string, a connecting hardware fitting, a crossover wire, a down lead and a transformer sleeve, and comprises the following steps:
acquiring a transformer substation sleeve system assembling model capable of inputting mechanical analysis software, wherein the transformer substation sleeve system assembling model can express a mechanical action relation among parts;
loading an external dynamic load for simulating environmental disturbance in mechanical analysis software, and solving the dynamic response of the transformer substation sleeve system assembly model under the action of the external dynamic load; the external dynamic load comprises a wind field dynamic load;
and acquiring dynamic mechanical characteristic data of the transformer substation sleeve system assembly model output by the mechanical analysis software.
Optionally, the method for obtaining the transformer substation bushing system assembly model includes establishing a parameterized entity model of the transformer substation bushing system by using computer aided design software, and assembling the transformer substation bushing system assembly model into a transformer substation bushing system assembly model capable of inputting mechanical analysis software. When the parameterized entity model of the transformer substation bushing system is established by using computer aided design software, parts or shape features which are irrelevant to mechanical characteristic analysis can be ignored.
In order to reduce hardware memory occupied by establishing a parameterized entity model of the transformer substation bushing system and reduce computing resources occupied by a dynamic mechanical characteristic analysis process of the transformer substation bushing system model, a space truss with enough rigidity is used for replacing the insulator string in the transformer substation bushing system assembly model; the space truss with sufficient rigidity comprises a plurality of beam unit structures so as to be equivalent to the beam unit properties of the insulator string.
In order to reduce hardware memory occupied by building a parameterized solid model of the transformer substation bushing system and reduce computing resources occupied by a dynamic mechanical characteristic analysis process of the transformer substation bushing system model, a square solid plate is used for replacing the connecting hardware fittings in the transformer substation bushing system assembly model, and the square solid plate is used for setting the distance between the overlines.
In order to reduce hardware memory occupied by establishing a parameterized solid model of a transformer substation bushing system and reduce computing resources occupied by a dynamic mechanical characteristic analysis process of the transformer substation bushing system model, if a lead used by an overline or a downlead of the transformer substation bushing system is a solid lead, a solid cylinder is used for replacing the solid lead in an assembly model of the transformer substation bushing system, and the outer diameter of the solid cylinder is the same as that of the solid lead; if the conductor used by the overline or the down conductor of the transformer substation casing system is a supporting type expanded diameter conductor, a concentric circular tube is used for replacing the supporting type expanded diameter conductor in the transformer substation casing system assembling model, the inner diameter of the concentric circular tube is the same as that of the supporting type expanded diameter conductor, and the outer diameter of the concentric circular tube is the same as that of the supporting type expanded diameter conductor.
Further, the transformer bushing's tip part includes protection casing, transformer terminal, flange, end cover board and wiring board, sets up mechanical action relation between the transformer bushing's tip part includes following substep: defining a contact pair; setting the connection relation and the contact tolerance between the contact pairs; and setting the mechanical conduction logic between the contact pairs.
Further, the method for acquiring the dynamic load of the wind field comprises the following steps: acquiring wind field data of a field installation environment of a transformer substation sleeve system, wherein the wind field data comprises wind speed and wind direction; verifying and perfecting the wind field data, including replacing data with wind speed or wind direction exceeding a reasonable range in the wind field data, and replacing data with wind speed increment exceeding the reasonable range in the wind field data; analyzing the wind field data in a frequency domain to obtain the alternating frequency of the dynamic load of the wind field; and calculating according to the alternating frequency, the wind direction and the wind speed of the wind field dynamic load to obtain the wind field dynamic load.
Preferably, the dynamic mechanical characteristic data of the transformer substation bushing system assembly model includes response frequencies of the overline and the downlead, maximum dynamic tension borne by the overline and the downlead, stress borne by end parts of the transformer bushing, radial deformation of the transformer bushing in a cylindrical coordinate, and radial deformation of the end cover plate in the cylindrical coordinate.
Preferably, the mechanical analysis software is finite element analysis software.
A computer readable medium storing a dynamic mechanical characteristic analysis program of a transformer substation sleeve system comprises an input module, a mechanical analysis module and an output module, wherein the input module is used for inputting assembly model data of the transformer substation sleeve system, and the assembly model of the transformer substation sleeve system can express a mechanical action relation among parts; the mechanical analysis module is used for calculating dynamic response data of the transformer substation sleeve system assembly model under the action of an external dynamic load after the external dynamic load for simulating environmental disturbance is applied to the transformer substation sleeve system assembly model; the output module is used for outputting dynamic mechanical characteristic data of the transformer substation sleeve system assembly model, and the dynamic mechanical characteristic data of the transformer substation sleeve system assembly model comprises response frequencies of the overline and the downlead, maximum dynamic tension borne by the overline and the downlead, stress borne by end parts of the transformer sleeve, radial deformation of the transformer sleeve under a cylindrical coordinate and radial deformation of an end cover plate under the cylindrical coordinate.
Compared with the prior art, the invention has the beneficial effects that:
1. by adopting the method, the dynamic bearing characteristic data of the transformer substation bushing system can be accurately and comprehensively acquired under the condition of wasting few resources. The method can be used for guiding decisions such as model selection, building and risk assessment of the transformer substation casing system.
2. After the parameterized entity model of the transformer substation bushing system is simplified, the hardware memory occupied by establishing the parameterized entity model of the transformer substation bushing system can be reduced, and the calculation resource occupied by the dynamic mechanical characteristic analysis process of the transformer substation bushing system model can be reduced.
3. The contact tolerance setting process is added in the mechanical action relation between the end parts of the transformer bushing, so that misjudgment of the contact state of the contact pair caused by the numerical error of the model size and the assembly error during the assembly of the model by finite element analysis software can be avoided.
4. The computer readable medium storing the dynamic mechanical characteristic analysis program of the transformer substation bushing system can reduce the requirement on the use technology of a user, and is convenient for popularization of the method.
Drawings
Fig. 1 is a simulated wind speed time course curve at a substation bushing system installation environment.
Fig. 2 is a wind load curve obtained by conversion from the wind speed time course curve shown in fig. 1.
Detailed Description
The present invention is described below in terms of embodiments in conjunction with the accompanying drawings to assist those skilled in the art in understanding and implementing the present invention. Unless otherwise indicated, the following embodiments and technical terms therein should not be understood to depart from the background of the technical knowledge in the technical field.
First part of the invention
A dynamic mechanical characteristic analysis method of a transformer substation bushing system comprises the following steps:
acquiring a transformer substation sleeve system assembling model capable of inputting mechanical analysis software, wherein the transformer substation sleeve system assembling model can express a mechanical action relation among parts;
setting and loading an external dynamic load for simulating environmental disturbance in mechanical analysis software, and solving the dynamic response of the transformer substation sleeve system assembly model under the action of the external dynamic load; the external dynamic load comprises a wind field dynamic load;
and obtaining the result of the dynamic mechanical characteristics of the transformer substation sleeve system assembly model.
In the prior art, finite element analysis software belongs to mechanical analysis software, and can be used as the mechanical analysis software of the invention.
Example 1: a dynamic mechanical characteristic analysis method of a transformer substation sleeve system comprises an insulator string, a connecting fitting, a crossover wire, a down lead and a transformer sleeve, wherein end parts of the transformer sleeve comprise a protective cover, a transformer binding post, a connecting flange, an end cover plate and a wiring board; the method comprises the following steps:
(1) and acquiring a transformer substation sleeve system assembling model capable of inputting finite element analysis software. The transformer substation bushing system assembling model can express mechanical action relations among parts, and the mechanical action relations among the parts comprise stress models and surface contact attributes. Specifically, the following procedure may be adopted:
(1a) and establishing a parameterized entity model of the parts of the transformer substation bushing system by using computer aided design software according to the design drawing of the transformer substation bushing system. When the parameterized entity model of the part is established by using computer aided design software, the part and the shape characteristics which are irrelevant to the mechanical characteristic analysis can be ignored by combining the mechanical characteristic analysis requirement of the invention.
In order to reduce hardware memory occupied by building parameterized entity models of parts and reduce computing resources occupied by a dynamic mechanical property analysis process of a transformer substation bushing system model, as insulator strings in the transformer substation bushing system are mainly used for supporting and suspending overlines and keeping reliable insulation between the overlines and a suspended tower and the ground, the electrical performance of the insulator strings can be ignored by combining the mechanical property analysis requirement of the invention, a space truss with enough rigidity is used for replacing the insulator strings in the transformer substation bushing system assembly model, and the space truss with enough rigidity comprises a plurality of beam unit structures to be equivalent to the beam unit properties of the insulator strings. According to the connection relation and the stress characteristic of the overline and the first connecting hardware fitting and the mechanical characteristic analysis requirement of the invention, a square solid plate can be used for replacing the first connecting hardware fitting in the transformer substation sleeve system assembling model, and the square solid plate is used for setting the distance of the overline. Because overhead transmission lines such as overlines and downleads are mostly stranded wires formed by stranding a plurality of metal wires, the mechanical characteristic analysis needs of the invention are combined, and the mutual contact among the stranded wires and the complex outer contour of the stranded wires of the lead can be ignored when the overall dynamic bearing characteristic of the system is analyzed. If the conductor used by the overline or the downlead of the transformer substation bushing system is a solid conductor, replacing the solid conductor in the transformer substation bushing system assembly model with a solid cylinder, wherein the outer diameter of the solid cylinder is the same as that of the solid conductor; if the conductor used by the overline or the down conductor of the transformer substation casing system is a supporting expanded-diameter conductor, a concentric circular tube is used for replacing the supporting expanded-diameter conductor in the transformer substation casing system assembly model, the inner diameter of the concentric circular tube is the same as that of the supporting expanded-diameter conductor, and the outer diameter of the concentric circular tube is the same as that of the supporting expanded-diameter conductor. The additional features such as the small holes, the chamfers, the bosses and the grooves which are made on the second connecting fitting due to the functional requirements such as processing, assembling and debugging are small in size and are not objects which are focused during mechanical analysis, but the problems of difficult meshing, node unit increase and the like are caused in the meshing process, so that the additional features are required to be deleted to simplify the geometric shape of the second connecting fitting. The methods can be used independently or in combination, and are beneficial to reducing hardware memory occupied by establishing a parameterized entity model of a part and reducing computing resources occupied by a transformer substation sleeve system model dynamic mechanical property analysis process.
(1b) And assembling the parameterized solid model of the parts in the finite element analysis software to obtain the transformer substation bushing system assembling model capable of being input into the finite element analysis software. When assembling the parameterized solid model of the parts, the interaction relationship among the parts needs to be set. Wherein, the movable mechanism comprises the following sub-steps: defining a contact pair; setting the connection relation and the contact tolerance between the contact pairs; and setting the mechanical conduction logic between the contact pairs. Specifically, the following procedure may be adopted:
binding constraints are mostly adopted for the constraint relationship among all parts in the transformer substation bushing system. In particular, different types of units are adopted between the insulator string and the first connecting hardware fitting for simulation, in the embodiment, the insulator string is simulated by the beam unit, the first connecting hardware fitting is simulated by the rod unit, so that the motion of one surface of the first connecting hardware fitting and the motion of one virtual constraint control point are constrained together by coupling constraint, and then the mutual relation between the insulator string and the end point of the insulator string is defined through the constraint control point.
The method for setting the mechanical action relationship between the end parts of the transformer bushing comprises the following steps:
the method comprises the steps of defining a contact pair, wherein the contact pair is composed of a pair of main surfaces and a secondary surface which are in contact with each other, considering the material property and the structural form of a model, taking the contact surface of a component with higher rigidity as the main surface and the contact surface of a component with lower rigidity as the secondary surface when rigidity difference exists between the components forming the contact pair, taking the contact surface with higher roughness as the main surface and the contact surface with lower roughness as the secondary surface when the rigidity difference between the components forming the contact pair is close, taking the contact surface with higher roughness as the secondary surface, taking the contact pair between a wiring board and a transformer post as an example, because the rigidity of the transformer post is lower than that of an aluminum alloy material, the surface of the wiring board is selected as the main surface, and taking a connecting flange with thicker grid cells as the main surface when the rigidity of the contact surface of the terminal board is similar, the number of grids needed to be generated by ①, the thickness of the grid cells to be considered for dividing the thickness of the grid cells into the thickness of the grid cells is larger than that of the mechanical analysis, and the contact angle of the grid cells is not limited by the mechanical analysis.
The connection relationship between the contact pairs and the contact tolerance are set. When the contact pair has relative sliding or relative rotation, the point sliding and the rotation sliding are determined according to the relative sliding quantity and the rotation quantity between the two contact surfaces. The connection board and the transformer terminal are easy to have large relative rotation under the action of torque, and point slippage and limited rotation slippage of any size between contact surfaces are selected to be allowed. When limited rotational slippage is set, the main surface is ensured to be smooth as much as possible, the arc surface is used for transition at the corner of the main surface, and a sufficient number of grid units are divided on the arc surface. The relative sliding and rotating amount of the contact pair formed by the end cover plate and the transformer wiring terminal is small (less than 20% of the unit size on the contact surface), and a small sliding algorithm is adopted.
Attention is paid to: when the connection relationship between the contact pairs is set but the contact tolerance is not set, the finite element analysis software determines the contact state of the main surface and the slave surface according to the distance between the main surface and the slave surface directly according to the size and the position of the assembly model, and the requirement is that the coordinates of the contact surfaces are accurately defined during modeling. The size of the model often has numerical errors, and the assembly errors (gaps or interference) are generated during the assembly of parts. Therefore, a position error limit (i.e., contact tolerance) is defined to adjust the initial coordinates of the slave surface nodes. The value of the contact tolerance is determined according to the size of the model grid cell and generally does not exceed the minimum grid cell.
And setting the mechanical conduction logic between the contact pairs. When two surfaces are in contact, normal force and tangential force can be simultaneously transmitted between the contact surfaces. The tangential force can be described using a friction model, the friction formula being:
wherein the content of the first and second substances,
is the critical tangential force;
is the coefficient of friction;
is the normal contact pressure.
The friction coefficient is related to the material property and the contact surface roughness, and the values of the friction coefficient in several pairs of contacts in the invention are as follows: the friction coefficient of a contact pair formed by the wiring board and the transformer terminal is mu =0.53, the friction coefficient of a contact pair formed by the end cover board and the connecting flange is mu =0.15, and the friction coefficient of a contact pair formed by the end cover board and the transformer terminal is mu = 0.51.
(2) Setting and loading an external dynamic load for simulating environmental disturbance in finite element analysis software, and solving the dynamic response of the transformer substation sleeve system assembly model under the action of the external dynamic load; the external dynamic loads include wind field dynamic loads.
The external dynamic load of the environmental disturbance on the outdoor power transmission and transformation equipment mainly consists of wind load. Wind load is a typical randomly alternating load. The method for acquiring the dynamic load of the wind field comprises the following steps: acquiring wind field data of a field installation environment of a transformer substation sleeve system, wherein the wind field data comprises wind speed and wind direction; verifying and perfecting the wind field data, including replacing data with wind speed or wind direction exceeding a reasonable range in the wind field data, and replacing data with wind speed increment exceeding the reasonable range in the wind field data; analyzing the wind field data in a frequency domain to obtain the alternating frequency of the dynamic load of the wind field; and calculating according to the alternating frequency, the wind direction and the wind speed of the wind field dynamic load to obtain the wind field dynamic load. Specifically, the following procedure may be adopted:
when external dynamic loads for simulating environmental disturbance are set, actually measured wind field data are adopted as much as possible. Before the measured wind field data is used, the wind field data is to be checked, and the method comprises the following steps:
1. and (4) data integrity inspection, namely checking whether the wind speed and wind direction data are lack of measurement.
2. And checking the reasonability of the wind field data, and checking whether the wind speed and the wind direction of the actually measured wind field data exceed the reasonable interval range. Generally, the average wind speed and wind direction per hour are reasonably in the range of 0-40 m/s and 0-360 degrees. In addition, the reasonability of the trend change of the wind power generation system is also required to be checked, and the difference value of the average wind speed in 1 hour in two adjacent hours is considered to be a reasonable value, wherein the difference value is less than 6 m/s.
3. And (4) data perfecting and supplementing, after wind field data inspection is carried out, if unreasonable data appears, removing is carried out, and a difference value calculation method is adopted to replace and supplement the unreasonable data removed by compensation.
After the actually measured wind field data is checked, the wind field data needs to be subjected to frequency domain analysis to obtain the main frequency change range and change frequency of the wind field change, and the alternating frequency of the dynamic load of the wind field is determined. And then calculating and determining the dynamic load of the wind field according to the alternating frequency of the dynamic load of the wind field, the actually measured wind speed and the actually measured wind direction.
If the actually measured wind field data cannot be obtained, the following wind speed numerical simulation method can be adopted for simulation calculation. When the wind field data is simulated through numerical values, the natural wind speed can be regarded as the superposition of the average wind speed and the fluctuating wind speed, and the simulation method comprises the following steps:
1. selecting different space node heights, and calculating to obtain average wind speeds at different heights through the following formula;
in the formula (I), the compound is shown in the specification,v 0 is a reference height ofh 0 Wind speed at =10m, here taken as 20 m/s;h 0 is a reference height;
different spatial node heights;
the wind pressure height variation coefficient is taken to be 0.16 here.
2. Calculating to obtain the pulsating wind speed by adopting a Davenport wind speed spectrum and a Davenport wind speed spectrum empirical formula, wherein the Davenport wind speed spectrum empirical formula is as follows:
in the formula (I), the compound is shown in the specification,
is the pulsation frequency (Hz);
wind speed (m/s) at a reference height of 10 m; k is the roughness coefficient of the ground. The value of the pulse frequency can be taken as required, and the alternating frequency obtained by the actual measurement can also be adopted;the values of the roughness coefficients of the ground with different landforms are shown in the following table
3. Based on a linear filtering method, writing a corresponding program in MATLAB, and simulating in a computer to obtain wind speed time courses of different node heights; the time course curve of the simulated wind speed at the height of 20.5m can be seen in fig. 1.
After wind field data (obtained by numerical simulation calculation or actual measurement) are obtained, the wind speed value can be converted into wind loads acting on the overline and the downlead, and the specific conversion formula is
Wherein the content of the first and second substances,
the wind load borne by the wire;
taking 1.0 as the wind speed uneven coefficient;
taking the aerodynamic coefficient as 1.2;
the projection area of the stress direction of the lead,
；
is the wind speed.
It was calculated that at a height of 20.5m, the wind load on the wire per unit length can be seen in fig. 2.
After an external dynamic load for simulating environmental disturbance is loaded in finite element analysis software, solving the dynamic response process of the transformer substation bushing system assembly model under the action of the external dynamic load is as follows: the damping of the flying and down conductor is first determined. Overhead power transmission conductors such as overlines and downlinks have special damping characteristics, and the damping ratios thereof in different directions of movement and torsion are significantly different, so that the damping ratios need to be defined for the three directions respectively. If the attention is not paid to the response results of the overline and the downlead, the damping of the overline and the downlead can be simplified, the damping ratio difference in each direction is not considered, the Rayleigh damping definition is directly used, and the formula is as follows:
wherein the content of the first and second substances,m ij is a unit mass element of the wire;k ij is a unit stiffness element of the wire; subscriptiRespectively taking 1, 2, 3 and 4; subscriptjRespectively taking 1, 2, 3 and 4; subscriptkRespectively taking 1, 2, 3 and 4; .β k1 Andβ k2 is determined by the following equation
Wherein the content of the first and second substances,ω k1 representing the system edgekThe 1 st order natural frequency of the direction,ω k2 representing the system edgekThe 2 nd order natural frequency of the direction,ξ k1to representkThe direction corresponds to the damping ratio of the first order mode,ξ k2to representkThe direction corresponds to the damping ratio of the second order mode, for wire-like suspension cable structures,ξ k1it may be taken to be 0.02,ξ k2 may be taken to be 0.02.
(3) And acquiring dynamic mechanical characteristic data of the transformer substation bushing system assembly model output by the finite element analysis software, wherein the dynamic mechanical characteristic data comprises response frequencies of the overline and the downlead, maximum dynamic tension borne by the overline and the downlead, stress borne by end parts of the transformer bushing, radial deformation of the transformer bushing in a cylindrical coordinate, and radial deformation of the end cover plate in the cylindrical coordinate. In specific application, response frequency of the overline and the downlead, maximum dynamic tension borne by the overline and the downlead, stress borne by end parts of the transformer bushing, radial deformation of the transformer bushing in a cylindrical coordinate, radial deformation of the end cover plate in the cylindrical coordinate and design of a transformer substation bushing system can be combined, and appropriate materials and shape structures are selected to meet safety standards. Specific reference may be made to the following description.
1. And (5) response frequency checking. And extracting the characteristics of displacement, speed, acceleration and the like of key nodes (1/2L, 1/4L, 1/8 and 3/4) and the like of the overline and the lead, performing Fourier transform on the time-course characteristics to obtain frequency domain characteristics of the time-course characteristics, finding out the main vibration frequency of the response of the lead under the action of alternating load, comparing the main vibration frequency with the natural frequency obtained from the modal analysis result, and checking whether co-frequency resonance occurs.
2. And evaluating the bearing reliability of the overline, the lead and the insulator string. And (4) extracting the tensions at the hanging points of the overline, the lead and the insulator string to obtain the maximum dynamic tension in the whole dynamic response process. And comparing the maximum dynamic tension with the breaking tension of the lead wires forming the overline and the lead wire and the maximum bearing capacity of the insulator string, and judging whether the insulator string is safe and reliable under the action of dynamic alternating load. It is generally considered reliable that the maximum dynamic tension is less than 50% of its maximum load bearing/breaking tension.
3. And checking the structural strength of the end part of the sleeve. The Mises stress of each part at the end part of the sleeve under a Cartesian coordinate system and the main stress in each direction are extracted, and for the sleeve part of the main transformer sleeve, the stress of the sleeve part under a cylindrical coordinate system needs to be extracted simultaneously. In addition, contact stress between the terminal plate and the transformer terminal, between the end cover plate and the transformer terminal, and between the end cover plate and the connecting flange, which are in contact with each other, must be extracted. And finding the position where the maximum stress of each part appears and the maximum stress value, and finding a stress concentration area. And comparing the maximum stress value of the stress concentration area with the material yield strength of the part, and considering that the maximum stress value of the part is 75% of the bending strength of the material, so that the part has a greater safety risk.
4. And (5) checking deformation of the main transformer sleeve and the end cover plate. And extracting radial deformation quantities of the main transformer sleeve and the end cover plate under the cylindrical coordinates, and checking whether the deformation of the main transformer sleeve and the end cover plate meets the design permission deformation or not under the action of the dynamic alternating load.
Second part of the invention
A computer readable medium storing a dynamic mechanical characteristic analysis program of a transformer substation bushing system, wherein the dynamic mechanical characteristic analysis program of the transformer substation bushing system comprises an input module, a mechanical analysis module and an output module, the input module is used for inputting assembly model data of the transformer substation bushing system, and the assembly model of the transformer substation bushing system can express a mechanical action relation among parts; the mechanical analysis module is used for calculating dynamic response data of the transformer substation sleeve system assembly model under the action of an external dynamic load after the external dynamic load for simulating environmental disturbance is applied to the transformer substation sleeve system assembly model; the output module is used for outputting dynamic mechanical characteristic data of the transformer substation sleeve system assembly model, and the dynamic mechanical characteristic data of the transformer substation sleeve system assembly model comprises response frequencies of the overline and the downlead, maximum dynamic tension borne by the overline and the downlead, stress borne by end parts of the transformer sleeve, radial deformation of the transformer sleeve under a cylindrical coordinate and radial deformation of an end cover plate under the cylindrical coordinate.
The external dynamic load data for simulating the environmental disturbance can be built in the mechanical analysis module, or can be obtained by a program in the mechanical analysis module executing the wind speed numerical simulation method and the wind speed value and wind load conversion method recorded in the first part of the invention, or can be wind load data obtained by the wind field data input by the input module after being operated by the mechanical analysis module.
The invention is described in detail above with reference to the figures and examples. It should be understood that in practice it is not intended to be exhaustive of all possible embodiments, and the inventive concepts of the present invention are presented herein by way of illustration. Without departing from the inventive concept of the present invention and without any creative work, a person skilled in the art should, in all of the embodiments, make optional combinations of technical features and experimental changes of specific parameters, or make a routine replacement of the disclosed technical means by using the prior art in the technical field to form specific embodiments, which belong to the content implicitly disclosed by the present invention.
Claims (7)
1. A dynamic mechanical characteristic analysis method of a transformer substation sleeve system comprises an insulator string, a connecting hardware fitting, a crossover wire, a down lead and a transformer sleeve, and is characterized by comprising the following steps of:
acquiring a transformer substation sleeve system assembling model capable of inputting mechanical analysis software, wherein the transformer substation sleeve system assembling model can express a mechanical action relation among parts;
loading an external dynamic load for simulating environmental disturbance in mechanical analysis software, and solving the dynamic response of the transformer substation sleeve system assembly model under the action of the external dynamic load; the external dynamic load comprises a wind field dynamic load;
and acquiring dynamic mechanical characteristic data of the transformer substation sleeve system assembly model output by the mechanical analysis software.
2. The method for analyzing the dynamic mechanical characteristics of the substation bushing system according to claim 1, wherein the method for obtaining the substation bushing system assembly model comprises establishing a parameterized solid model of the substation bushing system by using computer aided design software and assembling the parameterized solid model into the substation bushing system assembly model capable of inputting mechanical analysis software; when establishing a parameterized solid model of the transformer substation bushing system, at least one of the following measures is taken:
a first measure, replacing the insulator string in the substation bushing system assembly model with a space truss with sufficient rigidity, the space truss with sufficient rigidity comprising a plurality of beam unit structures to be equivalent to beam unit properties of the insulator string;
a second measure is to use a square solid plate to replace the connecting hardware in the transformer substation bushing system assembling model, wherein the square solid plate is used for setting the distance between the overlines;
in the third measure, if the lead used by the overline or the down lead of the transformer substation bushing system is a solid lead, a solid cylinder is used for replacing the solid lead in the transformer substation bushing system assembly model, and the outer diameter of the solid cylinder is the same as that of the solid lead; if the conductor used by the overline or the down conductor of the transformer substation casing system is a supporting type expanded diameter conductor, a concentric circular tube is used for replacing the supporting type expanded diameter conductor in the transformer substation casing system assembling model, the inner diameter of the concentric circular tube is the same as that of the supporting type expanded diameter conductor, and the outer diameter of the concentric circular tube is the same as that of the supporting type expanded diameter conductor.
3. The method for analyzing the dynamic mechanical characteristics of the substation bushing system according to claim 2, wherein the end parts of the transformer bushing comprise a protective cover, a transformer terminal, a connecting flange, an end cover plate and a wiring board, and the step of setting the mechanical action relationship between the end parts of the transformer bushing comprises the following sub-steps: defining a contact pair; setting the connection relation and the contact tolerance between the contact pairs; and setting the mechanical conduction logic between the contact pairs.
4. The method for analyzing the dynamic mechanical characteristics of the substation bushing system according to claim 1, wherein the method for acquiring the dynamic load of the wind field comprises the following steps: acquiring wind field data of a field installation environment of a transformer substation sleeve system, wherein the wind field data comprises wind speed and wind direction; verifying and perfecting the wind field data, including replacing data with wind speed or wind direction exceeding a reasonable range in the wind field data, and replacing data with wind speed increment exceeding the reasonable range in the wind field data; analyzing the wind field data in a frequency domain to obtain the alternating frequency of the dynamic load of the wind field; and calculating according to the alternating frequency, the wind direction and the wind speed of the wind field dynamic load to obtain the wind field dynamic load.
5. The method for analyzing the dynamic mechanical characteristics of the substation bushing system according to claim 1, wherein the dynamic mechanical characteristic data of the substation bushing system assembly model includes response frequencies of the overline and the downlead, maximum dynamic tensions borne by the overline and the downlead, stresses borne by end parts of the transformer bushing, radial deformation amounts of the transformer bushing in a cylindrical coordinate, and radial deformation amounts of the end cover plate in the cylindrical coordinate.
6. The method for analyzing the dynamic mechanical characteristics of the substation bushing system according to claim 1, wherein the mechanical analysis software is finite element analysis software.
7. A computer readable medium storing a dynamic mechanical characteristic analysis program of a transformer substation bushing system is characterized by comprising an input module, a mechanical analysis module and an output module, wherein the input module is used for inputting assembling model data of the transformer substation bushing system, and the assembling model of the transformer substation bushing system can express a mechanical action relation among parts; the mechanical analysis module is used for calculating dynamic response data of the transformer substation sleeve system assembly model under the action of an external dynamic load after the external dynamic load for simulating environmental disturbance is applied to the transformer substation sleeve system assembly model; the output module is used for outputting dynamic mechanical characteristic data of the transformer substation sleeve system assembly model, and the dynamic mechanical characteristic data of the transformer substation sleeve system assembly model comprises response frequencies of the overline and the downlead, maximum dynamic tension borne by the overline and the downlead, stress borne by end parts of the transformer sleeve, radial deformation of the transformer sleeve under a cylindrical coordinate and radial deformation of an end cover plate under the cylindrical coordinate.
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