CN105784959A - Distribution transformer winding material detection method - Google Patents

Abstract

The embodiment of the invention discloses a distribution transformer winding material detection method.The method comprises the steps of objective function determination, optimal solution acquisition and quantitative investigation, wherein in the step of objective function determination, transformer design parameters and external characteristic parameters are considered; in the step of optimal solution acquisition, a correlation function of the external characteristic of the detected transformer serves as an optimization objective, completely same constraint conditions and fitness functions are adopted, the winding material adopts copper wires and aluminum wires for design respectively, transformer design is optimized by applying a genetic algorithm, and an optimal solution WCu and an optimal solution WAl of a W-Cu initial population and a W-Al initial population are solved respectively; in the step of quantitative investigation, quantitative representation is conducted through the distance from an actual measurement point Wm of the detected transformer to the consideration weight coefficient of the optimal solution WCu and the optimal solution WAl, the probability value of the detected transformer belonging to a copper winding transformer or an aluminum winding transformer is obtained, and convenient, rapid and accurate analytical judgment on the detected transformer winding material is achieved.

Description

A kind of distribution transformer winding wood properly test method

Technical field

The present invention relates to the equipment detection technique field that powers, particularly relate to a kind of distribution transformer winding wood properly test side Method.

Background technology

Along with socioeconomic fast development, the power consumption of entire society is increasing, becomes controller switching equipment especially distribution The demand of depressor is increasing.But, part distribution transformer producer is higher in order to obtain under less market profit The market share, by all strategies of faking, such as false capacity, illusory nameplate, uses poor material etc..Among these with aluminum Wire replace the even outside winding of copper conductor coiling Transformer Winding be copper cash, internal winding be that the fraudulence of aluminum steel is the strongest, Wherein, including using half aluminum steel or full aluminum steel, winding be aluminum steel, Secondary Winding be copper cash, a winding is copper Line, Secondary Winding are aluminum steel, and part producing enterprise even uses full aluminum steel instead as a winding and Secondary Winding.This with Distribution transformer containing aluminum steel pretends to be the shoddy behavior of copper cash distribution transformer, not only makes consumer ignorant of the fact cover Being subject to loss economically, also the operation to distribution transformer brings potential safety hazard, thus to distribution transformer winding material It is the most necessary that matter carries out detecting.

In prior art, distribution transformer winding material is detected and generally has following several method: one is to become distribution Depressor winding carries out destroying sampling, carries out metallochemistry analysis, but this destructive test method needs distribution transformer to stop transport Carry out dissection test, distribution transformer is carried out destructive strip inspection and is not only difficult to obtain the agreement of manufacturer, and The follow-up use of the detected distribution transformer of impact.Another kind, is to utilize ray inspection machine and industrial radiographic film to distribution Transformer Winding is taken pictures, by the x-ray attenuation coefficient scanning thickness curve of tested distribution transformer winding respectively with copper X-ray attenuation coefficient scanning thickness curve and the x-ray attenuation coefficient scanning thickness curve of aluminum contrast, but this Detection method not only can produce radiation, affects the health of testing staff, and testing cost is high, is not easy to use at the scene.

Summary of the invention

The embodiment of the present invention provides a kind of distribution transformer winding wood properly test method, to solve current transformer The problem that winding is difficult to check at the scene for the fraud means of copper conductor with aluminum conductor.

In order to solve above-mentioned technical problem, the embodiment of the invention discloses following technical scheme:

A kind of distribution transformer winding wood properly test method, including:

Choose design of transformer parameter as the genotype codes of population at individual, External Characters of Transformer parameter as described population Individual Phenotype coding；

Design objective according to tested transformator and parameter request, set up respectively with described genotype codes be function input, Described Phenotype is encoded at the beginning of the W-Cu initial population of copper winding transformer and the W-Al of aluminum winding transformer of function output Beginning population；

Using the described corresponding performance requirement of tested transformator as constraints, with the optimization aim letter of described tested transformator Number, as fitness function, utilizes genetic algorithm to obtain described W-Cu initial population respectively relative with described W-Al initial population Optimal solution W answered_CuAnd W_Al；

Obtain actual measurement external characteristics parameter Wm of described tested transformator；

According to individual and described external characteristics parameter Wm in described W-Cu population in the last reign of a dynasty and W-Al population in the last reign of a dynasty close to journey Degree, builds object function F；

According to described object function F, draw probability and aluminum winding transformer that described survey transformator is copper winding transformer Probability；

Wherein, described object functionIn formula, Section 1 correspondence transformator is outer special Other index in temperature rise index in property parameter, Section 2 correspondence External Characters of Transformer parameter, p_iAnd p_jIt is respectively described Optimal solution W_CuAnd W_AlIn temperature rise index external characteristics parameter and other index external characteristics parameter, p_jCSFor described actual measurement external characteristics Corresponding p in parameter Wm_jParameter, r_i、r_jFor parameter p_i、p_jWeight coefficient.

Preferably, described method also includes:

Respectively with described optimal solution W_CuAnd W_AlFor the centre of sphere and to set deviation value as radius, obtain described copper winding transformation The W-Cu population in the last reign of a dynasty of device and the W-Al population in the last reign of a dynasty of described aluminum winding transformer；

Calculate the individuality in described W-Cu population in the last reign of a dynasty and W-Al population in the last reign of a dynasty, individuality at F '～F '+interior for Δ F ' respectively The frequency distribution that the ratio of number and total individual number changes with F '；

According to described frequency distribution, draw the general of probability that described survey transformator is copper winding transformer and aluminum winding transformer Rate；

Wherein, $F^{\′}=F^{\′}\left(P\right)=\underset{i=1}{\overset{m}{\Σ}}{r}_i{p_i}^{\′}+\underset{j=1}{\overset{n}{\Σ}}{r}_j\left|{p_j}^{\′}-p_{jCS}\right|,{p_i}^{\′}=\frac{p_i}{{10}^{\[lg\left(p_i\right)\]+1}},{p_j}^{\′}=\frac{p_j}{{10}^{\[lg\left(p_j\right)\]+1}}.$

Preferably, described design of transformer parameter includes core design COEFFICIENT K, operating magnetic field flux density B, high voltage winding unshakable in one's determination Group current in wire density design point J_H, low pressure winding conducting wire current density, J_L, every layer of number of turn n of low pressure winding_LWith high pressure winding Every layer of number of turn n_H。

Preferably, described design of transformer parameter includes no-load current percentage value I₀%, load loss P_K, high pressure phase winding Resistance R_RH, unshakable in one's determination oil temperature is risen Δ θ_co, low pressure winding to oil temperature rise Δ θ_WHL, transformator gross weight G_T, total oil weight Go, Open circuit loss P₀, short-circuit impedance perunit value u_K%, low pressure phase winding resistance R_RL, high pressure winding to oil temperature rise Δ θ_WHH, oil right Air temperature rise Δ θ_oWith untanking mass G_B。

Preferably, described W-Cu initial population and described W-Al initial population scale are 200-400.

Preferably, genetic algorithm is utilized to obtain described W-Cu initial population respectively corresponding with described W-Al initial population Optimal solution W_CuAnd W_AlTime, including:

Set population generation number as 40-80, crossover probability as 0.75-0.90 and mutation probability as 0.02-0.05.

From above technical scheme, a kind of distribution transformer winding wood properly test method that the embodiment of the present invention provides, bag Include object function determine, optimal solution obtain and the step of quantitative expedition.Wherein, in object function determines, change is considered Transformer design parameter and external characteristics parameter；In optimal solution obtains using the correlation function of the external characteristics of tested transformator as Optimization aim, uses identical constraints and fitness function, and winding material is respectively adopted copper cash and aluminum steel sets Meter, the process of application genetic algorithm optimization design of transformer, solve in W-Cu initial population and W-Al just population respective Optimal solution W_CuAnd W_Al；Quantitative expedition is applied the eyeball Wm of tested transformator to described optimal solution W_CuAnd W_AlExamine Consider the distance after weight coefficient and carry out quantification statement, it is achieved the mapping of external characteristics parameter space W to 1 dimension real number space R, enter And obtain tested transformator and belong to copper winding transformer or the probit of aluminum winding transformer.The embodiment of the present invention provides Detection method, can be carried out its winding material conveniently, soon in the case of tested transformator not being carried out strip inspection Prompt, analyze judgement accurately, provide tested Transformer Winding material and belong to copper winding or the probit of aluminum winding, it is possible to Meet the demand of the distribution transformer actually detected application of winding material.

Accompanying drawing explanation

In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing In technology description, the required accompanying drawing used is briefly described, it should be apparent that, for those of ordinary skill in the art Speech, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.

The mathematics description method schematic diagram of a kind of winding wood properly test problem that Fig. 1 provides for the embodiment of the present invention；

The schematic flow sheet of a kind of distribution transformer winding wood properly test method that Fig. 2 provides for the embodiment of the present invention；

The population characterisitic parameter space outside that Fig. 3 provides for the embodiment of the present invention is to the schematic diagram of " distance " spatial transformation；

A kind of copper winding transformer that Fig. 4 provides for the embodiment of the present invention and aluminum winding transformer the last reign of a dynasty population one-dimensional Frequency distribution in " distance " space.

Detailed description of the invention

For the technical scheme making those skilled in the art be more fully understood that in the present invention, implement below in conjunction with the present invention Accompanying drawing in example, is clearly and completely described the technical scheme in the embodiment of the present invention, it is clear that described reality Executing example is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, ability The every other embodiment that territory those of ordinary skill is obtained under not making creative work premise, all should belong to this The scope of invention protection.

As it is shown in figure 1, distribution transformer includes external characteristics parameter space T_C(parameter includes no-load transformer performance, load Performance, quality, temperature rise etc.) and design parameter space T_D(parameter includes wire gauge, core limb diameter etc.).Specific Under design objective, the whole feasible program of copper winding transformer characterisitic parameter space T outside_CWith design parameter space T_DMiddle composition Collection T_CAnd T (Cu)_D(Cu), same aluminum winding transformer whole feasible program composition set T_CAnd T (Al)_D(Al)。

In copper winding transformer, simply with aluminum conductor replace copper conductor can cause winding D.C. resistance, load loss, Deviating considerably from occur in the parameters such as temperature rise；And by the above-mentioned deviation of design modification, no-load transformer characteristic, short circuit can be caused again Impedance and overall dimensions generation large change.This phenomenon may be summarized to be the copper winding transformer under same performance requires and aluminum The external characteristics parameter space of winding transformer can not be completely overlapped, i.e. T_CAnd T (Cu)_C(Al) not exclusively overlap.Tested change Depressor T is at T_CAnd T_DIn show as a T_CSAnd T_DS, T_CSKnown maybe can survey, T_DSThe unknown, so analyzing tested transformator T Winding material, it is simply that judge T_CSWith T_CAnd T (Cu)_C(Al) generic relation.

The embodiment of the present invention is exactly to apply above-mentioned characteristic to detect the winding material of tested transformator.

See Fig. 2, the schematic flow sheet of a kind of distribution transformer winding wood properly test method provided for the embodiment of the present invention, Specifically include following steps:

S110: choose design of transformer parameter as the genotype codes of population at individual, External Characters of Transformer parameter as institute State the Phenotype coding of population at individual.

Concrete, according to the research to design of transformer method, by idiotype coded representation it is G=(K, B, J_H,J_L,n_L,n_H), wherein, K is core-diameter design ratio, and B is operating magnetic field flux density unshakable in one's determination, J_HFor high pressure Winding conducting wire current density design point, J_LFor low pressure winding conducting wire electric current density, n_LFor every layer of number of turn of low pressure winding, n_HFor Every layer of number of turn of high pressure winding.

Meanwhile, Phenotype coding need to fully reflect copper winding and aluminum winding transformer external characteristics difference, therefore is denoted as P= (I_O%, P₀, P_K, u_K%, R_RH, R_RL, Δ θ_co, Δ θ_WHL, Δ θ_WHH, Δ θ_o, G_T, G_B, G_O), wherein, I₀% is empty Carry electric current percentage value, P₀For open circuit loss, P_KFor load loss, R_RH、R_RLFor high and low pressure phase winding resistance；Δθ_coFor Temperature rise unshakable in one's determination, Δ θ_WHH、Δθ_WHLFor high and low pressure winding temperature rise, Δ θ_oFor oil temperature liter, G_T、G_B、G_OFor transformator gross weight Amount, untanking mass and weight of oil.

S120: according to design objective and the parameter request of tested transformator, set up respectively with described genotype codes as function Input, described Phenotype are encoded to the W-Cu initial population of copper winding transformer of function output and aluminum winding transformer W-Al initial population.

It will be apparent that according to individual genotype calculate phenotypic process be exactly a point from design parameter space V to The mapping of corresponding point, the namely design process of transformator in external characteristics parameter space W.

During specific design iron core, can be according to relevant empirical equation after selected silicon steel material and core construction pattern at the beginning of Fixed core column diameter.Described empirical equation is:

$D=K^4\sqrt{P}---\left(1\right)$

Wherein, P is every column capacity (unit: kVA is determined by transformer capacity and core construction) of core limb, and K is Core limb diameter design coefficient, it is core limb nominal diameter (unit: mm) that its value typically takes 52-57, D.After just determining D Core limb cross section S (unit: m can be determined according to relevant design manual²)。

The one turn voltage Et of winding, (can be determined by stalloy magnetic property, how at 1.75T at the first fixed core close Bm of post maximum magnetic flux Hereinafter) calculated by winding voltage UL (unit: V) of low pressure winding according to formula (2), formula (3), and be adjusted to afterwards Making low pressure umber of turn NL is integer (in formula, f is power frequency, 50Hz).

E_t=4.44fB_mS (2)

$N_L=\frac{U_L}{E_t}---\left(3\right)$

By the voltage U of high pressure winding_H(unit: V) determines and checks high pressure umber of turn N_HAfter, can substantially carry out around Organize the number of turn arrangement of each layer, and arrange the position of tap-changing windings and each tap.

Wire for winding can be after selected wire pattern (enamel-cover, paper bag round wires or lenticular wire), by each winding current I_H、 I_L(copper conductor takes 3-5A/mm2 to the economic current density of value and wire, and aluminum conductor takes 2-3A/mm2, takes smaller value and is conducive to Heat radiation and reduction load loss) determine sectional area of wire, look into reference books and can select each physical dimension of wire.

Number of turn arrangement according to wire physical dimension and winding i.e. can determine that the width of winding to size and axial dimension, according to around Insulating structure design (counting the interlayer oil duct of winding if desired) between group, between winding and iron core, i.e. can determine that the complete of winding Portion's physical dimension, winding D.C. resistance and winding loss, and winding weight, and can calculating transformer short-circuit impedance, Formula (4).

$u_{kx}\%=\frac{49.6{\mathrm{f\ρI}}_H{N}_H\ΣD}{E_{t}H\×{10}^6}\%---\left(4\right)$

I in formula (4)_HN_HFor high pressure winding magnetic potential (unit: A), it is possible to calculate by low pressure winding；H be high-low pressure around The equivalent reactance height (unit: cm calculates according to winding physical height) of group；ρ is the Rowgowski coefficient of winding, By winding Size calculation；Σ D is equivalent leakage field area (unit: the cm of high-low pressure winding²), by winding and oil duct size Calculate.

After packet size determines, just according to phase insulation distance and winding, the insulation system of iron yoke can be determined in iron core The heart away from MO and window height HW and other each physical dimension, in conjunction with stalloy characterisitic parameter i.e. can determine that iron core gross weight, Excitation loss P_OWith no-load current I_O。

Winding and core dimensions determine after can according to winding and lead-in wire to oil tank wall insulation distance, if desired consider tap open The structure closed, determines the size of oil tank body.

Each index above-mentioned (short-circuit impedance, no-load characteristic, load loss) can calculate each according to relevant formula after determining The temperature rise to oil of the individual parts, is calculated and determined whole parameters of radiator by the pattern of radiator.Can in whole design process Can need calculating and correction are repeated several times, the satisfied design of gained design result requires and after relevant criterion, design process is substantially Complete.

In the present embodiment, application genetic algorithm is by this process Complete Algorithm, to adapt to the requirement of computer disposal, wherein, It is for making algorithm have preferable performance and stability, described W-Cu initial population and described W-Al initial population scale 200-400, but it is not limited to described numerical range.

S130: using the described corresponding performance requirement of tested transformator as constraints, with the optimization of described tested transformator Object function, as fitness function, utilizes genetic algorithm to obtain described W-Cu initial population respectively and described W-Al initially plants Optimal solution W that faciation is corresponding_CuAnd W_Al。

Environment includes two aspects to individual selection pressure: one is the property that every transformator must is fulfilled for that relevant criterion proposes Can requirement, two is that environment tends to select the individuality more meeting optimization aim (such as cost minimum or other targets). The requirement of previous aspect is to have mandatory, and the individuality being i.e. unsatisfactory for performance requirement should directly be eliminated, for this by each standard The performance requirement proposed as constraints, directly eliminates when finally determining the fitness value of individuality and is unsatisfactory for performance and wants The individuality asked.

After the most mandatory constraints, can individuality adapt to environment and be embodied in the degree of closeness to optimization aim.One The most individual certain function phenotypic of optimization aim for as, here we are by optimization aim expression formula combination algorithm Feature is as fitness function.

After determining constraints and fitness function, calculate according to the flow process of general genetic algorithm, for making this enforcement Example algorithm has preferable performance and stability, the present embodiment set population generation number as 40-80, crossover probability as 0.75-0.90, mutation probability is 0.02-0.05, but is not limited to described numerical range.

S140: obtain actual measurement external characteristics parameter Wm of described tested transformator.

S150: according to individual and described external characteristics parameter Wm in described W-Cu population in the last reign of a dynasty and W-Al population in the last reign of a dynasty Degree of closeness, builds object function F.

According to individual and described external characteristics parameter Wm in described W-Cu population in the last reign of a dynasty and W-Al population in the last reign of a dynasty close to journey Degree, is converted into the single-object problem making " distance " minimum by problem.

In above-mentioned 13 external characteristics indexs, in addition to 4 temperature rise indexs are the smaller the better index of value, remaining respectively refers to Mark is more close with described external characteristics parameter Wm the best.Wherein, the form of object function F is as follows:

$F=F\left(P\right)=\underset{i=1}{\overset{4}{\Σ}}{r}_i{p}_i+\underset{j=1}{\overset{9}{\Σ}}{r}_j\left|p_j-p_{jCS}\right|---\left(5\right)$

In formula (5) Chinese style, the temperature rise index in Section 1 correspondence External Characters of Transformer parameter, Section 2 correspondence transformator Other index, p in external characteristics parameter_iAnd p_jIt is respectively described optimal solution W_CuAnd W_AlIn temperature rise index external characteristics parameter With other index external characteristics parameter, p_jCSFor p corresponding in described external characteristics parameter Wm_jParameter, r_i、r_jFor parameter p_i、p_j Weight coefficient.

For by under each parameter transformation to the same order of magnitude and obtain probability function, by the actual parameter p in formula (5)_i、 p_jIt is transformed to parameter p in interval (0,1)_i′、p_j', specific as follows:

$p_i=\frac{p_i}{{10}^{\[lg\left(p_i\right)\]+1}}---\left(6\right)$

In formula (6), bracket function f (x)=[x] is defined as taking the integer of no more than x.So object function F namely " away from From " it is defined as:

$F^{\′}=F^{\′}\left(P\right)=\underset{i=1}{\overset{4}{\Σ}}{r}_i{p_i}^{\′}+\underset{j=1}{\overset{9}{\Σ}}{r}_j\left|{p_j}^{\′}-p_{jCS}\right|---\left(7\right)$

Wherein, each weight coefficient determines according to transformator constraints and parameter characteristic.Consider in conjunction with a large amount of test results, The present embodiment selectes weight coefficient as shown in Table 1, but is not limited to described numerical value, and test result shows the little of weight coefficient simultaneously Range is the least on the impact of optimum results.

Table one:

Parameter	Weight coefficient table	Parameter	Weight coefficient value
				No-load current percentage value I0%	0.4	Open circuit loss P0	0.4
Load loss PK	0.4	Short-circuit impedance perunit value uK%	0.4
				High pressure phase winding resistance RRH	1	Low pressure phase winding resistance RRL	1
Unshakable in one's determination to oil temperature liter Δ θco	0.5	High pressure winding rises Δ θ to oil temperatureWHH	0.5
				Low pressure winding rises Δ θ to oil temperatureWHL	0.5	Oil is to air temperature rise Δ θo	0.5
Transformator gross weight GT	1	Untanking mass GB	0.5
				Total oil weight Go	0.5

S160: according to described object function F, draw probability and the change of aluminum winding that described survey transformator is copper winding transformer The probability of depressor.

The concrete numerical value of the object function F ' after conversion according to described object function F, draw described survey transformator be copper around The probability of group transformator and the probability of aluminum winding transformer, such as, the object function F ' result of calculation after conversion is about 0.5, In the case it is believed that tested transformator have employed copper aluminum mixed materials or other manufacture means.

Further, when population scale is bigger, described copper winding transformer and described aluminum winding transformer distribution can Characterize with population in the last reign of a dynasty, and point W-Cu population in the last reign of a dynasty or the distribution near Wm of the W-Al population in the last reign of a dynasty, set up calculating accordingly Wm belongs to the method for the probability of W-Cu population in the last reign of a dynasty and W-Al population in the last reign of a dynasty, specifically includes following steps:

S210: respectively with described optimal solution W_CuAnd W_AlFor the centre of sphere and to set deviation value as radius, obtain described copper around The W-Cu population in the last reign of a dynasty of group transformator and the W-Al population in the last reign of a dynasty of described aluminum winding transformer.

That is, described optimal solution W is being found_CuAnd W_AlOn the premise of, the last reign of a dynasty, population population presented with W_CuAnd W_AlCentered by Distribution.

S220: calculate the individuality in described W-Cu population in the last reign of a dynasty and W-Al population in the last reign of a dynasty, interior at F '～F '+Δ F ' respectively The frequency distribution that changes with F of the ratio of number of individuals and total individual number.

Concrete, utilize formula (5) to formula (7), as it is shown on figure 3, Species structure in the last reign of a dynasty is converted into one-dimensional " away from From " distribution in space, wherein, the last reign of a dynasty, population frequency distribution in one-dimensional " distance " space was defined as away from described Optimal solution W_CuAnd W_AlFor the number of individuals of F '～F '+interior for Δ F ' and the ratio of total individual number with the change of F.

S220: according to described frequency distribution, draw probability and aluminum winding transformation that described survey transformator is copper winding transformer The probability of device.

Utilize described frequency distribution, estimate that in the individuality in described W-Cu population in the last reign of a dynasty and W-Al population in the last reign of a dynasty, each point exists The probability of F '～F '+interior value of Δ F ', thus calculates Wm and takes in described W-Cu population in the last reign of a dynasty and W-Al population in the last reign of a dynasty The probability of value, and then draw the probability and the probability of aluminum winding transformer that described survey transformator is copper winding transformer.

As shown in Figure 4, for for a certain distribution transformer, design is containing 500 individual W-Cu initial population and W-Al Initial population, after 40 generations of evolving, the last reign of a dynasty population frequency distribution.Wherein, a large amount of tests show that described frequency distribution is close Exponential, can describe the distribution of population in the last reign of a dynasty by exponential.

From above technical scheme, the present embodiment is based on to copper winding transformer and aluminum winding transformer external characteristics difference Analyse in depth, use identical constraints and fitness function, respectively according to using copper conductor and aluminum conductor to become Transformer design, with the relevant function of tested transformer characteristic as optimization aim, uses genetic algorithm to carry out design of transformer Optimize, draw optimal solution W under two kinds of designs_CuAnd W_Al；By investigating the fitness function optimal value of respective population, Quantification estimates that tested transformer parameter Wm belongs to the probability of W-Cu and W-Al, draws final test result.The present embodiment, According to External Characters of Transformer parameter conversed analysis winding material, identify possible winding fraud problem, take precautions against this type of product inferior Product enter electrical network.

Each embodiment in this specification all uses the mode gone forward one by one to describe, identical similar part between each embodiment Seeing mutually, what each embodiment stressed is the difference with other embodiments.In this article, such as Term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include The process of a series of key elements, method, article or equipment not only include those key elements, but also include being not expressly set out Other key elements, or also include the key element intrinsic for this process, method, article or equipment.The most more In the case of many restrictions, statement " including ... " key element limited, it is not excluded that in the mistake including described key element Journey, method, article or equipment there is also other identical element.

The above is only the detailed description of the invention of the present invention, makes to skilled artisans appreciate that or realize the present invention. Multiple amendment to these embodiments will be apparent to one skilled in the art, and as defined herein one As principle can realize in other embodiments without departing from the spirit or scope of the present invention.Therefore, this The bright the embodiments shown herein that is not intended to be limited to, and be to fit to and principles disclosed herein and features of novelty The widest consistent scope.

Claims (6)

1. a distribution transformer winding wood properly test method, it is characterised in that including:

Choose design of transformer parameter as the genotype codes of population at individual, External Characters of Transformer parameter as described population Individual Phenotype coding；

Design objective according to tested transformator and parameter request, set up respectively with described genotype codes be function input, Described Phenotype is encoded at the beginning of the W-Cu initial population of copper winding transformer and the W-Al of aluminum winding transformer of function output Beginning population；

Using the described corresponding performance requirement of tested transformator as constraints, with the optimization aim letter of described tested transformator Number, as fitness function, utilizes genetic algorithm to obtain described W-Cu initial population respectively relative with described W-Al initial population Optimal solution W answered_CuAnd W_Al；

Obtain actual measurement external characteristics parameter Wm of described tested transformator；

According to individual and described external characteristics parameter Wm in described W-Cu population in the last reign of a dynasty and W-Al population in the last reign of a dynasty close to journey Degree, builds object function F；

According to described object function F, draw probability and aluminum winding transformer that described survey transformator is copper winding transformer Probability；

Wherein, described object functionIn formula, Section 1 correspondence transformator is outer special Other index in temperature rise index in property parameter, Section 2 correspondence External Characters of Transformer parameter, p_iAnd p_jIt is respectively described Optimal solution W_CuAnd W_AlIn temperature rise index external characteristics parameter and other index external characteristics parameter, p_jCSFor described actual measurement external characteristics Corresponding p in parameter Wm_jParameter, r_i、r_jFor parameter p_i、p_jWeight coefficient.

Distribution transformer winding wood properly test method the most according to claim 1, it is characterised in that described method is also Including:

Respectively with described optimal solution W_CuAnd W_AlFor the centre of sphere and to set deviation value as radius, obtain described copper winding transformation The W-Cu population in the last reign of a dynasty of device and the W-Al population in the last reign of a dynasty of described aluminum winding transformer；

Calculate the individuality in described W-Cu population in the last reign of a dynasty and W-Al population in the last reign of a dynasty, individuality at F '～F '+interior for Δ F ' respectively The frequency distribution that the ratio of number and total individual number changes with F '；

According to described frequency distribution, draw the general of probability that described survey transformator is copper winding transformer and aluminum winding transformer Rate；

Wherein, $F^{\′}=F^{\′}\left(P\right)=\underset{i=1}{\overset{m}{\Σ}}{r}_i{p_i}^{\′}+\underset{j=1}{\overset{m}{\Σ}}{r}_j|{p_j}^{\′}-p_{jCS}|,{p_i}^{\′}=\frac{p_i}{{10}^{\[\lg \left(p_i\right)\]+1}},{p_j}^{\′}=\frac{p_j}{{10}^{\[\lg \left(p_j\right)\]+1}}.$

Distribution transformer winding wood properly test method the most according to claim 1, it is characterised in that described transformator Design parameter includes core design COEFFICIENT K, operating magnetic field flux density B, high pressure winding current in wire density design point J unshakable in one's determination_H、 Low pressure winding conducting wire current density, J_L, every layer of number of turn n of low pressure winding_LWith every layer of number of turn n of high pressure winding_H。

Distribution transformer winding wood properly test method the most according to claim 1, it is characterised in that described transformator External characteristics parameter includes no-load current percentage value I₀%, load loss P_K, high pressure phase winding resistance R_RH, unshakable in one's determination to oil temperature liter Δθ_co, low pressure winding to oil temperature rise Δ θ_WHL, transformator gross weight G_T, total oil weight Go, open circuit loss P₀, short-circuit impedance Perunit value u_K%, low pressure phase winding resistance R_RL, high pressure winding to oil temperature rise Δ θ_WHH, oil to air temperature rise Δ θ o and device heavy sensation of the body Amount G_B。

Distribution transformer winding wood properly test method the most according to claim 1, it is characterised in that described W-Cu Initial population and described W-Al initial population scale are 200-400.

Distribution transformer winding wood properly test method the most according to claim 1 or 5, it is characterised in that utilize and lose Propagation algorithm obtains optimal solution W that described W-Cu initial population is corresponding with described W-Al initial population respectively_CuAnd W_AlTime, Including:

Set population generation number as 40-80, crossover probability as 0.75-0.90 and mutation probability as 0.02-0.05.