CN112466627A - Design method and system of transformer oil tank and transformer oil tank - Google Patents

Design method and system of transformer oil tank and transformer oil tank Download PDF

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CN112466627A
CN112466627A CN202011254296.1A CN202011254296A CN112466627A CN 112466627 A CN112466627 A CN 112466627A CN 202011254296 A CN202011254296 A CN 202011254296A CN 112466627 A CN112466627 A CN 112466627A
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transformer
arc
oil tank
transformer oil
energy
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CN112466627B (en
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赵勇进
王革鹏
石毛毛
郭家元
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China XD Electric Co Ltd
Xian XD Transformer Co Ltd
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China XD Electric Co Ltd
Xian XD Transformer Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design

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  • Mathematical Analysis (AREA)
  • Computational Mathematics (AREA)
  • Housings And Mounting Of Transformers (AREA)

Abstract

The invention provides a design method and a system of a transformer oil tank and the transformer oil tank, wherein the first arc energy generated when a transformer fails is determined by utilizing the electrical design parameters and the discharge position of the transformer; determining second arc energy converted into the internal pressure of the transformer oil tank in the first arc energy by using the energy conversion coefficient, and calculating the acoustic power of the second arc energy; performing acoustic simulation on the transformer oil tank based on the acoustic power to obtain a sound pressure value inside the transformer oil tank; performing joint simulation processing on the sound field and the mechanical field by taking the sound pressure value as the input of the mechanical field to obtain a pressure distribution cloud chart of the transformer oil tank; according to the pressure distribution cloud picture, determining weak positions of the transformer oil tank, wherein the structural strength of the weak positions is smaller than a strength threshold value; and arranging a pressure release device at a weak position of the transformer oil tank. The method has the advantages that equivalent simulation is carried out on the arc energy caused by the transformer fault, explosion-proof design is carried out on the transformer oil tank according to the simulation result, and the explosion-proof performance of the transformer oil tank is improved.

Description

Design method and system of transformer oil tank and transformer oil tank
Technical Field
The invention relates to the technical field of transformer equipment, in particular to a design method and a system of a transformer oil tank and the transformer oil tank.
Background
The transformer is one of the most widely used electrical devices at present, and if an internal short circuit fault occurs in the transformer during operation, partial discharge is caused to cause sudden pressure rise inside the transformer oil tank, which may cause rupture and even explosion of the transformer oil tank, so the structure of the transformer oil tank needs to be designed for explosion prevention.
The current explosion-proof design mode for the structure of the transformer oil tank is as follows: and determining an arc fault energy transmission mode in the transformer in the modes of a semi-empirical energy conservation formula, a five-equation method and the like, and carrying out explosion-proof design on the structure of the transformer oil tank according to the arc fault energy transmission mode. However, due to the particularity and limitation of applicable conditions of the semi-empirical energy conservation formula and the five-equation method, the complex change process of arc fault energy caused by internal faults of the transformer cannot be accurately analyzed, and the explosion-proof performance of the transformer oil tank is poor.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and a system for designing a transformer tank, and solve the problem of poor explosion-proof performance of the transformer tank in the current explosion-proof design manner.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the first aspect of the embodiment of the invention discloses a design method of a transformer oil tank, which comprises the following steps:
determining first arc energy generated when the transformer fails by using electrical design parameters and a discharge position of the transformer;
determining second arc energy converted into the internal pressure of a transformer oil tank corresponding to the transformer in the first arc energy by using a preset energy conversion coefficient, and calculating the acoustic power corresponding to the second arc energy;
performing acoustic simulation on the transformer oil tank based on the acoustic power to obtain an internal sound pressure value of the transformer oil tank;
performing joint simulation treatment on the sound field and the mechanical field by taking the sound pressure value as the input of the mechanical field to obtain a pressure distribution cloud chart of the transformer oil tank;
according to the pressure distribution cloud picture, weak positions of which the structural strength is smaller than a strength threshold value in the transformer oil tank are determined;
and arranging a pressure release device at the weak position of the transformer oil tank.
Preferably, the determining, by using a preset energy conversion coefficient, a second arc energy converted into an internal pressure of a transformer tank corresponding to the transformer in the first arc energy, and calculating an acoustic power corresponding to the second arc energy includes:
using W- σ WarcDetermining a second arc energy W converted into the internal pressure of the transformer oil tank corresponding to the transformer in the first arc energy, wherein WarcSigma is a preset energy conversion coefficient for the first arc energy;
based on the second arc energy, passing through PeCalculating the acoustic power P corresponding to the second arc energy as W/teWhere t is the arc duration.
Preferably, the performing acoustic simulation on the transformer oil tank based on the acoustic power to obtain the sound pressure value inside the transformer oil tank includes:
taking the arc discharge position point corresponding to the transformer as a monopole sound source, and based on the sound power, passing through
Figure BDA0002772612180000021
Calculating the volume flow rate Q of the monopole sound source, wherein k is wave number and PeTaking rho c as the characteristic impedance of the transformer insulating oil as the acoustic power;
based on the volume flow rate, by
Figure BDA0002772612180000022
Calculating the vibration amplitude A of the monopole sound source, wherein i is the unit of an imaginary number;
using said amplitude of vibration, by
Figure BDA0002772612180000023
And calculating a sound pressure value P inside the transformer oil tank, wherein R is the distance from the pressure surface to the monopole sound source.
Preferably, the determining the first arc energy generated when the transformer fails by using the electrical design parameters and the discharge position of the transformer includes:
using electrical design parameters and discharge location of the transformer, by Warc═ u (t) i (t) dt determines a first arc energy W produced when the transformer failsarcWhere u (t) is an arc voltage, i (t) is an arc current, and u (t) ═ E' larcE' is the unit electric field strength,/arcFor the arc length, t is the arc duration.
Preferably, the step of providing a pressure relief device at the weak position of the transformer tank comprises:
determining the area information of the weak position on the transformer oil tank;
selecting a corresponding type of pressure relief device using the zone information;
the pressure relief means is located at the weakened position.
In a second aspect of the embodiments of the present invention, a system for designing a transformer tank is disclosed, the system including:
the first determining unit is used for determining first arc energy generated when the transformer fails by utilizing the electrical design parameters and the discharge position of the transformer;
the processing unit is used for determining second arc energy converted into the internal pressure of a transformer oil tank corresponding to the transformer in the first arc energy by using a preset energy conversion coefficient, and calculating the acoustic power corresponding to the second arc energy;
the first simulation unit is used for performing acoustic simulation on the transformer oil tank based on the acoustic power to obtain an internal sound pressure value of the transformer oil tank;
the second simulation unit is used for performing combined simulation processing on a sound field and a mechanical field by taking the sound pressure value as the input of the mechanical field to obtain a pressure distribution cloud chart of the transformer oil tank;
the second determining unit is used for determining a weak position of the transformer oil tank, wherein the structural strength of the weak position is smaller than a strength threshold value, according to the pressure distribution cloud picture;
and the setting unit is used for setting a pressure release device at the weak position of the transformer oil tank.
Preferably, the processing unit includes:
a determination module for utilizing W ═ σ WarcDetermining a second arc energy W converted into the internal pressure of the transformer oil tank corresponding to the transformer in the first arc energy, wherein WarcSigma is a preset energy conversion coefficient for the first arc energy;
a calculation module for passing P based on the second arc energyeCalculating the acoustic power P corresponding to the second arc energy as W/teWhere t is the arc duration.
Preferably, the first simulation unit includes:
a first calculation module for using the arc discharge position point corresponding to the transformer as a monopole sound source based on the sound power
Figure BDA0002772612180000041
Calculating the volume flow rate Q of the monopole sound source, wherein k is wave number and PeTaking rho c as the characteristic impedance of the transformer insulating oil as the acoustic power;
a second calculation module for passing the flow rate based on the volume flow rate
Figure BDA0002772612180000042
Calculating the sheetThe vibration amplitude A, i of the polar sound source is a unit of an imaginary number;
a third calculation module for using said vibration amplitude by
Figure BDA0002772612180000043
And calculating a sound pressure value P inside the transformer oil tank, wherein R is the distance from the pressure surface to the monopole sound source.
Preferably, the first determining unit is specifically configured to: using electrical design parameters and discharge location of the transformer, by Warc═ u (t) i (t) dt determines a first arc energy W produced when the transformer failsarcWhere u (t) is an arc voltage, i (t) is an arc current, and u (t) ═ E' larcE' is the unit electric field strength,/arcFor the arc length, t is the arc duration.
The third aspect of the embodiment of the invention discloses a transformer oil tank, which consists of a tank wall, a tank cover, a tank bottom, a reinforcing structure and a pressure release device.
Based on the design method and system of the transformer oil tank and the transformer oil tank provided by the embodiment of the invention, the method comprises the following steps: determining first arc energy generated when the transformer breaks down by using the electrical design parameters and the discharge position of the transformer; determining second arc energy converted into the internal pressure of a transformer oil tank corresponding to the transformer in the first arc energy by using a preset energy conversion coefficient, and calculating the acoustic power corresponding to the second arc energy; performing acoustic simulation on the transformer oil tank based on the acoustic power to obtain an internal sound pressure value of the transformer oil tank; performing joint simulation processing on the sound field and the mechanical field by taking the sound pressure value as the input of the mechanical field to obtain a pressure distribution cloud chart of the transformer oil tank; according to the pressure distribution cloud picture, determining weak positions of the transformer oil tank, wherein the structural strength of the weak positions is smaller than a strength threshold value; and arranging a pressure release device at a weak position of the transformer oil tank. The method comprises the steps of converting arc energy caused by transformer faults into acoustic power, and respectively carrying out acoustic simulation and combined simulation of a sound field and a mechanical field to obtain a pressure distribution cloud chart for designing an explosion-proof structure of the transformer oil tank, so that the explosion-proof performance of the transformer oil tank is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a method for designing a transformer tank according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an explosion-proof design structure of a transformer oil tank according to an embodiment of the present invention;
FIG. 3 is a flow chart of calculating the acoustic power of the second arc energy provided by an embodiment of the present invention;
FIG. 4 is a flow chart of determining an acoustic pressure value according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a monopole sound source provided by an embodiment of the present invention;
fig. 6 is a block diagram of a design system of a transformer tank according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
According to the background technology, when the explosion-proof design is carried out on the transformer oil tank, the arc fault energy transmission mode in the transformer needs to be determined, and then the explosion-proof design is carried out on the structure of the transformer oil tank according to the arc fault energy transmission mode. However, due to the particularity and limitation of the existing method for determining the propagation mode of the arc fault energy, the complex change process of the arc fault energy caused by the internal fault of the transformer cannot be accurately analyzed, so that the explosion-proof performance of the transformer oil tank is poor.
Therefore, the embodiment of the invention provides a design method and a system of a transformer oil tank and the transformer oil tank, wherein the pressure distribution cloud chart for designing an explosion-proof structure of the transformer oil tank is obtained by converting arc energy caused by transformer faults into sound power and respectively carrying out acoustic simulation and combined simulation of a sound field and a mechanical field so as to improve the explosion-proof performance of the transformer oil tank.
Referring to fig. 1, a flow chart of a method for designing a transformer tank according to an embodiment of the present invention is shown, where the method includes:
step S101: and determining the first arc energy generated when the transformer fails by using the electrical design parameters and the discharge position of the transformer.
In the process of implementing step S101 specifically, for a transformer requiring an explosion-proof design of a transformer tank, the electrical design parameters and the discharge position of the transformer are used to calculate the energy generated when an internal fault occurs in the transformer, where the energy generated when the fault occurs is the first arc energy.
When the first arc energy is specifically calculated, the electric design parameters and the discharge position of the transformer are utilized, and the product of the transformer when the transformer fails is determined through the formula (1)First arc energy Warc。
Warc＝∫U(t)i(t)dt (1)
In equation (1), u (t) is the arc voltage, i (t) is the arc current, and t is the arc duration.
It can be understood that when a short circuit occurs inside the transformer, due to the arrangement of the special insulation structure inside the transformer, a short circuit arc is formed at a fault point, the voltage at two ends of the short circuit arc is u (t), and the arc voltage u (t) can be calculated by establishing a physical relationship between the arc length and the electric field strength, that is, u (t) E' larcE' is the unit electric field strength,/arcThe arc length is determined in particular by the severity of the fault of the transformer.
It should be noted that i (t) is the short circuit arc current, and the arc current i (t) can be obtained by a per unit value method (for example only). For the arc duration, this can be obtained using sensors inside the transformer.
That is, after obtaining u (t), i (t), and t in the above manner, the first arc energy W generated when the transformer fails can be calculated and obtained by the above formula (1)arc。
Step S102: and determining second arc energy converted into the internal pressure of the transformer oil tank corresponding to the transformer in the first arc energy by using a preset energy conversion coefficient, and calculating the acoustic power corresponding to the second arc energy.
In the process of implementing step S102 specifically, a preset energy conversion coefficient is used to determine a second arc energy converted into the internal pressure of the transformer oil tank corresponding to the transformer in the first arc energy. That is, the part of the first arc energy converted into the internal pressure of the transformer tank is the second arc energy, in other words, the second arc energy is a part of the first arc energy.
After the second arc energy is determined, the acoustic power corresponding to the second arc energy is calculated.
Step S103: and performing acoustic simulation on the transformer oil tank based on the acoustic power to obtain the internal sound pressure value of the transformer oil tank.
In the process of implementing step S103 specifically, the arc discharge position point corresponding to the transformer is used as a monopole sound source, and the acoustic power obtained by calculation is used to perform acoustic simulation on the transformer oil tank, so as to obtain the sound pressure value inside the transformer oil tank.
Step S104: and performing joint simulation treatment on the sound field and the mechanical field by taking the sound pressure value as the input of the mechanical field to obtain a pressure distribution cloud chart of the transformer oil tank.
In the process of implementing step S104, data transmission between the sound field and the mechanical field is implemented by using a mesh mapping method and the like for the sound pressure value inside the transformer oil tank. The data calculation and analysis of the mechanical field adopts structural finite element software, the transient analysis module is used for carrying out structural finite element analysis on the acquired parameters, and a nonlinear finite element solver is used for solving, so that the combined simulation processing of the sound field and the mechanical field is completed.
That is, the sound pressure value is input to the mechanical field, that is, the calculation result of the sound field is input to the mechanical field, and the sound field and the mechanical field are subjected to the joint simulation processing (that is, the joint simulation processing of the sound field and the mechanical field) on the sound pressure value. It is understood that the sound field-mechanical field co-simulation process includes co-simulation and data post-processing.
And determining a pressure distribution cloud chart of the transformer oil tank in the time domain according to the result of the combined simulation processing of the sound field and the mechanical field, wherein the pressure distribution cloud chart can reflect the pressure on the surface of the transformer oil tank.
Step S105: and determining weak positions of which the structural strength is smaller than a strength threshold value in the transformer oil tank according to the pressure distribution cloud picture.
In the process of implementing the step S105 specifically, according to the pressure distribution cloud chart, a weak position in the transformer oil tank where the structural strength is smaller than the strength threshold is determined, so as to perform structural reinforcement processing at the weak position.
Step S106: and arranging a pressure release device at a weak position of the transformer oil tank.
In the process of implementing step S106 specifically, for each weak point, the area information indicating which area of the transformer tank the weak point is located in and the range size of the weak point is determined.
It will be appreciated that the area and size of the transformer tank in which the weak point is located may vary, as may the pressure relief means (or reinforcing structure) required.
Therefore, for a weak point, the corresponding type of pressure relief device is selected by using the area information of the weak point, and the pressure relief device is arranged at the weak point. That is, different pressure relief devices are arranged at the weak position of the transformer tank according to the area and the size of the weak position, so that the explosion-proof design of the transformer tank is realized.
It should be noted that the types of pressure relief devices include, but are not limited to, pressure relief valves, rupture disks, and the like.
It can be understood that after the weak position of transformer tank is confirmed, the pressure release device that each weak position corresponds can be rationally selected to and confirm the quantity of the pressure release device that need set up, set up each pressure release device in the weak position department that corresponds respectively, can pass through pressure release device quick release transformer tank's internal pressure when the transformer breaks down, avoid transformer tank to cause structural damage because of internal pressure is too big.
To better explain the structure of the explosion-proof design of the transformer tank, it is explained by referring to fig. 2, and it should be noted that fig. 2 is only used as an example.
Referring to fig. 2, which shows a schematic structural diagram of an explosion-proof design of a transformer tank provided by an embodiment of the invention, it can be understood that the interface between the inside and the outside of the transformer tank is an outer shell for protecting a transformer body and a container for containing oil, a shell for bearing the transformer body, the transformer oil and the overall lifting weight, and a platform for mounting external components and a radiator of a transformer.
The transformer oil tank mainly comprises a tank wall 2, a tank cover 6, a tank bottom 5, a reinforcing structure (steel groove) 3, a reinforcing structure 4, a pressure release device 7 and a pressure release device 8.
It should be noted that the structural members constituting the transformer tank are described above by way of example only, and the installation positions and the number of the pressure relief devices 7 and 8 are also described by way of example only.
In the embodiment of the invention, the electric design parameters and the discharge position of the transformer are utilized to determine the first arc energy generated when the transformer fails, and the second arc energy converted into the internal pressure of the transformer oil tank corresponding to the transformer in the first arc energy and the acoustic power corresponding to the second arc energy are determined. And performing acoustic simulation on the transformer oil tank based on the acoustic power to obtain an internal sound pressure value of the transformer oil tank, and performing joint simulation processing on a sound field and a mechanical field by taking the sound pressure value as the input of the mechanical field to obtain a pressure distribution cloud chart of the transformer oil tank. According to the pressure distribution cloud picture, weak positions, with the structural strength smaller than the strength threshold value, in the transformer oil tank are determined, and a pressure release device is arranged at the weak positions of the transformer oil tank. The method comprises the steps of converting arc energy caused by transformer faults into acoustic power, and respectively carrying out acoustic simulation and combined simulation of a sound field and a mechanical field to obtain a pressure distribution cloud chart for designing an explosion-proof structure of the transformer oil tank, so that the explosion-proof performance of the transformer oil tank is improved.
In the above-mentioned embodiment of the present invention, referring to fig. 3, the process of calculating the acoustic power corresponding to the second arc energy in step S102 in fig. 1 is a flowchart for calculating the acoustic power corresponding to the second arc energy according to the embodiment of the present invention, which includes the following steps:
step S301: and (3) determining a second arc energy converted into the internal pressure of the transformer oil tank corresponding to the transformer in the first arc energy by using the formula (2).
In the process of implementing step S301, the second arc energy W is calculated by equation (2).
W＝σ*Warc (2)
In the formula (2), Warcσ is a predetermined energy conversion coefficient for the first arc energy.
It will be appreciated that the energy conversion factor is determined using electrical design parameters of the transformer and data algorithm fitting results.
Step S302: and calculating the acoustic power corresponding to the second arc energy through the formula (3) based on the second arc energy.
In the process of specifically implementing step S302, based on the second arc energy W, the acoustic power P corresponding to the second arc energy is calculated by formula (3)eI.e. PeAcoustic power that converts the second arc energy into acoustic energy.
Pe＝W/t (3)
In equation (3), t is the arc duration.
It should be noted that, in the insulating oil corresponding to the transformer, the second arc energy is transmitted to each area inside the transformer oil tank in the form of sound wave, corresponding pressure is generated on the tank wall and other structures of the transformer oil tank, and when the long discharge power is constant during discharge, the sound power corresponding to the second arc energy can be calculated by using the above formula (3).
In the embodiment of the invention, the acoustic power corresponding to the second arc energy and the second arc energy is respectively calculated by using the established formulas, and then the acoustic simulation and the combined simulation of the sound field and the mechanical field are respectively carried out based on the acoustic power to obtain the pressure distribution cloud chart for designing the transformer oil tank, so that the explosion-proof performance of the transformer oil tank is improved.
In the above embodiment of the present invention, referring to fig. 4, the process of calculating the sound pressure value inside the transformer oil tank in step S103 in fig. 1 shows a flowchart of determining the sound pressure value according to the embodiment of the present invention, which includes the following steps:
step S401: and (3) taking the arc discharge position point corresponding to the transformer as a monopole sound source, and calculating the volume flow rate of the monopole sound source through a formula (4) based on the sound power.
In the process of implementing the step S401, a structural model and an electromagnetic structural model of the transformer oil tank are first constructed by using designated software, the structural model and the electromagnetic structural model are introduced into acoustic finite element software for preprocessing, and then the sound pressure value of each position inside the transformer oil tank is calculated.
It can be understood that, as can be seen from the foregoing, the arc power is replaced by the form of the acoustic power, the acoustic simulation software is used to calculate the propagation of the arc energy by using the acoustic wave equation, the arc discharge position point corresponding to the transformer is used as the monopole sound source, that is, the monopole sound source exists in the arc discharge position point, and the volume flow rate Q of the monopole sound source is calculated by the formula (4).
Figure BDA0002772612180000101
In the formula (4), k is the wave number, Peρ c is the characteristic impedance of the transformer insulating oil for acoustic power.
To better understand the above-mentioned monopole sound source, which is illustrated by fig. 5 in conjunction with fig. 2, and referring to fig. 5, a schematic diagram of a monopole sound source provided by an embodiment of the present invention is shown.
In fig. 5, a monopole sound source 1 is present at the arc discharge position point of the transformer.
Step S402: the vibration amplitude of the monopole sound source is calculated by formula (5) based on the volume flow rate.
In the process of embodying step S402, the vibration amplitude a of the monopole sound source is calculated by equation (5) based on the volume flow rate.
Figure BDA0002772612180000102
In formula (5), i is the unit of an imaginary number.
Step S403: and (4) calculating the sound pressure value inside the transformer oil tank by using the vibration amplitude through a formula (6).
In the process of implementing step S403 specifically, the sound pressure value P inside the transformer oil tank is calculated by equation (6) using the vibration amplitude.
Figure BDA0002772612180000103
In equation (6), R is the distance from the pressure surface to the monopole sound source, that is, P is the pressure generated by the monopole sound source on a spherical surface with a radius of R, and e is a constant in the mathematical domain.
From the foregoing, it can be understood that, when the acoustic finite element method is used for calculation, the inner wall of the transformer oil tank is designed as a rigid boundary, the pressure release device (pressure release valve or rupture membrane) is set as a Perfect Matching Layer (PML) or as a full sound absorption boundary according to the characteristics of the medium, transient analysis is adopted, the analysis duration is set as at least one discharge period (i.e., 1/f), and finally, the acoustic finite element result is subjected to post-processing and other operations, so as to obtain the sound pressure value distribution inside the transformer oil tank.
In the embodiment of the invention, the arc discharge position point corresponding to the transformer is used as the monopole sound source, the vibration amplitude of the monopole sound source is calculated based on the sound power, and the sound pressure value in the transformer oil tank is further calculated. And performing sound field-mechanical field combined simulation processing by using the sound pressure value to obtain a pressure distribution cloud chart for designing the transformer oil tank, so as to improve the explosion-proof performance of the transformer oil tank.
Corresponding to the design method of the transformer oil tank provided by the above embodiment of the present invention, referring to fig. 6, an embodiment of the present invention further provides a structural block diagram of a design system of the transformer oil tank, where the design system includes: a first determination unit 601, a processing unit 602, a first simulation unit 603, a second simulation unit 604, a second determination unit 605, and a setting unit 606;
the first determining unit 601 is configured to determine a first arc energy generated when the transformer fails by using the electrical design parameters and the discharge position of the transformer.
In a specific implementation, the first determining unit 601 is specifically configured to: and (3) determining the first arc energy generated when the transformer fails according to the formula (1) by utilizing the electrical design parameters and the discharge position of the transformer.
The processing unit 602 is configured to determine, by using a preset energy conversion coefficient, second arc energy converted into an internal pressure of a transformer oil tank corresponding to the transformer in the first arc energy, and calculate an acoustic power corresponding to the second arc energy.
The first simulation unit 603 is configured to perform acoustic simulation on the transformer tank based on the acoustic power to obtain a sound pressure value inside the transformer tank.
And the second simulation unit 604 is configured to perform joint simulation processing on the sound field and the mechanical field by using the sound pressure value as an input of the mechanical field, so as to obtain a pressure distribution cloud map of the transformer oil tank.
And the second determining unit 605 is configured to determine, according to the pressure distribution cloud chart, a weak position in the transformer oil tank where the structural strength is smaller than the strength threshold.
A setting unit 606 for setting a pressure relief device at a weak position of the transformer tank.
In a specific implementation, the setting unit 606 is specifically configured to: and determining the area information of the weak position on the transformer oil tank, selecting a corresponding type of pressure release device by using the area information, and arranging the pressure release device at the weak position.
In the embodiment of the invention, the electric design parameters and the discharge position of the transformer are utilized to determine the first arc energy generated when the transformer fails, and the second arc energy converted into the internal pressure of the transformer oil tank corresponding to the transformer in the first arc energy and the acoustic power corresponding to the second arc energy are determined. And performing acoustic simulation on the transformer oil tank based on the acoustic power to obtain an internal sound pressure value of the transformer oil tank, and performing joint simulation processing on a sound field and a mechanical field by taking the sound pressure value as the input of the mechanical field to obtain a pressure distribution cloud chart of the transformer oil tank. According to the pressure distribution cloud picture, weak positions, with the structural strength smaller than the strength threshold value, in the transformer oil tank are determined, and a pressure release device is arranged at the weak positions of the transformer oil tank. The method comprises the steps of converting arc energy caused by transformer faults into acoustic power, and respectively carrying out acoustic simulation and combined simulation of a sound field and a mechanical field to obtain a pressure distribution cloud chart for designing the transformer oil tank, so that the explosion-proof performance of the transformer oil tank is improved.
Preferably, in conjunction with the content shown in fig. 6, the processing unit 602 includes a determining module and a calculating module, and the execution principle of each module is as follows:
and the determining module is used for determining second arc energy converted into the internal pressure of the transformer oil tank corresponding to the transformer in the first arc energy by using the formula (2).
And the calculating module is used for calculating the acoustic power corresponding to the second arc energy through a formula (3) based on the second arc energy.
In the embodiment of the invention, the acoustic power corresponding to the second arc energy and the second arc energy is respectively calculated by using the established formulas, and then the acoustic simulation and the combined simulation of the sound field and the mechanical field are respectively carried out based on the acoustic power to obtain the pressure distribution cloud chart for designing the transformer oil tank, so that the explosion-proof performance of the transformer oil tank is improved.
Preferably, in combination with the content shown in fig. 6, the first simulation unit 603 includes a first calculation module, a second calculation module, and a third calculation module, and the execution principle of each module is as follows:
and the first calculation module is used for taking the arc discharge position point corresponding to the transformer as a monopole sound source and calculating the volume flow rate of the monopole sound source through a formula (4) based on the sound power.
And the second calculation module is used for calculating the vibration amplitude of the monopole sound source through a formula (5) based on the volume flow rate.
And the third calculation module is used for calculating the sound pressure value inside the transformer oil tank through a formula (6) by utilizing the vibration amplitude.
In the embodiment of the invention, the arc discharge position point corresponding to the transformer is used as the monopole sound source, the vibration amplitude of the monopole sound source is calculated based on the sound power, and the sound pressure value in the transformer oil tank is further calculated. And performing sound field-mechanical field combined simulation processing by using the sound pressure value to obtain a pressure distribution cloud chart for designing the transformer oil tank, so as to improve the explosion-proof performance of the transformer oil tank.
Preferably, the embodiment of the invention further provides a transformer tank, which is composed of a tank wall, a tank cover, a tank bottom, a reinforcing structure and a pressure release device, and the installation position of the pressure release device on the transformer tank is determined by the design method of the transformer tank provided by the embodiment of the invention.
In summary, embodiments of the present invention provide a method and a system for designing a transformer tank, and a transformer tank, where arc energy caused by a transformer fault is converted into acoustic power, and acoustic simulation and combined simulation of a sound field and a mechanical field are performed respectively to obtain a pressure distribution cloud chart for designing the transformer tank, so as to improve the explosion-proof performance of the transformer tank.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A design method of a transformer oil tank is characterized by comprising the following steps:
determining first arc energy generated when the transformer fails by using electrical design parameters and a discharge position of the transformer;
determining second arc energy converted into the internal pressure of a transformer oil tank corresponding to the transformer in the first arc energy by using a preset energy conversion coefficient, and calculating the acoustic power corresponding to the second arc energy;
performing acoustic simulation on the transformer oil tank based on the acoustic power to obtain an internal sound pressure value of the transformer oil tank;
performing joint simulation treatment on the sound field and the mechanical field by taking the sound pressure value as the input of the mechanical field to obtain a pressure distribution cloud chart of the transformer oil tank;
according to the pressure distribution cloud picture, weak positions of which the structural strength is smaller than a strength threshold value in the transformer oil tank are determined;
and arranging a pressure release device at the weak position of the transformer oil tank.
2. The method according to claim 1, wherein the determining, by using a preset energy conversion coefficient, a second arc energy of the first arc energy, which is converted into an internal pressure of a transformer tank corresponding to the transformer, and calculating an acoustic power corresponding to the second arc energy comprises:
using W- σ WarcDetermining a second arc energy W converted into the internal pressure of the transformer oil tank corresponding to the transformer in the first arc energy, wherein WarcSigma is a preset energy conversion coefficient for the first arc energy;
based on the second arc energy, passing through PeCalculating the acoustic power P corresponding to the second arc energy as W/teWhere t is the arc duration.
3. The method of claim 1, wherein the performing an acoustic simulation of the transformer tank based on the acoustic power to obtain a sound pressure value inside the transformer tank comprises:
taking the arc discharge position point corresponding to the transformer as a monopole sound source, and based on the sound power, passing through
Figure FDA0002772612170000011
Calculating the volume flow rate Q of the monopole sound source, wherein k is wave number and PeTaking rho c as the characteristic impedance of the transformer insulating oil as the acoustic power;
based on the volume flow rate, by
Figure FDA0002772612170000012
Calculating the vibration amplitude A of the monopole sound source, wherein i is the unit of an imaginary number;
using said amplitude of vibration, by
Figure FDA0002772612170000021
And calculating a sound pressure value P inside the transformer oil tank, wherein R is the distance from the pressure surface to the monopole sound source.
4. The method of claim 1, wherein determining the first arc energy generated when the transformer fails using the electrical design parameters and the discharge location of the transformer comprises:
using electrical design parameters and discharge location of the transformer, by Warc═ u (t) i (t) dt determines a first arc energy W produced when the transformer failsarcWhere u (t) is an arc voltage, i (t) is an arc current, and u (t) ═ E' larcE' is the unit electric field strength,/arcFor the arc length, t is the arc duration.
5. The method of claim 1, wherein the providing a pressure relief device at the weak location of the transformer tank comprises:
determining the area information of the weak position on the transformer oil tank;
selecting a corresponding type of pressure relief device using the zone information;
the pressure relief means is located at the weakened position.
6. A system for designing a tank for a transformer, said system comprising:
the first determining unit is used for determining first arc energy generated when the transformer fails by utilizing the electrical design parameters and the discharge position of the transformer;
the processing unit is used for determining second arc energy converted into the internal pressure of a transformer oil tank corresponding to the transformer in the first arc energy by using a preset energy conversion coefficient, and calculating the acoustic power corresponding to the second arc energy;
the first simulation unit is used for performing acoustic simulation on the transformer oil tank based on the acoustic power to obtain an internal sound pressure value of the transformer oil tank;
the second simulation unit is used for performing combined simulation processing on a sound field and a mechanical field by taking the sound pressure value as the input of the mechanical field to obtain a pressure distribution cloud chart of the transformer oil tank;
the second determining unit is used for determining a weak position of the transformer oil tank, wherein the structural strength of the weak position is smaller than a strength threshold value, according to the pressure distribution cloud picture;
and the setting unit is used for setting a pressure release device at the weak position of the transformer oil tank.
7. The system of claim 6, wherein the processing unit comprises:
a determination module for utilizing W ═ σ WarcDetermining a second arc energy W converted into the internal pressure of the transformer oil tank corresponding to the transformer in the first arc energy, wherein WarcSigma is a preset energy conversion coefficient for the first arc energy;
a calculation module for passing P based on the second arc energyeCalculating the acoustic power P corresponding to the second arc energy as W/teWhere t is the arc duration.
8. The system of claim 6, wherein the first simulation unit comprises:
a first calculation module for using the arc discharge position point corresponding to the transformer as a monopole sound source based on the sound power
Figure FDA0002772612170000031
Calculating the volume flow rate Q of the monopole sound source, wherein k is wave number and PeTaking rho c as the characteristic impedance of the transformer insulating oil as the acoustic power;
a second calculation module for passing the flow rate based on the volume flow rate
Figure FDA0002772612170000032
Calculating the vibration amplitude A of the monopole sound source, wherein i is the unit of an imaginary number;
a third calculation module for using said vibration amplitude by
Figure FDA0002772612170000033
Calculating the sound pressure value P inside the transformer oil tank, wherein R is a pressure surfaceA distance to the monopole sound source.
9. The system according to claim 6, wherein the first determining unit is specifically configured to: using electrical design parameters and discharge location of the transformer, by Warc═ u (t) i (t) dt determines a first arc energy W produced when the transformer failsarcWhere u (t) is an arc voltage, i (t) is an arc current, and u (t) ═ E' larcE' is the unit electric field strength,/arcFor the arc length, t is the arc duration.
10. A transformer tank, characterized in that the transformer tank is composed of a tank wall, a tank cover, a tank bottom, a reinforcing structure and a pressure relief device, and the installation position of the pressure relief device on the transformer tank is determined by the design method of the transformer tank as claimed in any one of the above claims 1 to 5.
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