CN112816830A - Method for rapidly screening cable sections with ablation hidden danger of buffer layer of high-voltage power cable - Google Patents
Method for rapidly screening cable sections with ablation hidden danger of buffer layer of high-voltage power cable Download PDFInfo
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- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to a method for quickly screening cable sections with potential ablation hazards of a buffer layer of a high-voltage power cable, which is technically characterized by comprising the following steps of: calculating the total contact area of the corrugated sheath and the buffer layer of the cable; searching the contact ratio of the corresponding fault cable section in historical data, entering the next step if the contact ratio of the corresponding fault cable section is found, and otherwise, calculating the contact ratio of the fault cable section according to the total contact area of the corrugated sheath and the buffer layer; obtaining a screening threshold value of the cable section with the ablation hidden danger of the buffer layer according to the contact ratio of the fault cable section; and screening the cable section with the buffer layer ablation hidden danger by using the buffer layer ablation hidden danger cable section screening threshold value. According to the method, the contact ratio of the buffer layer and the wrinkle sheath is calculated according to the contact area of the wrinkle sheath and the buffer layer of the high-voltage power cable, so that the cable section with the ablation hidden danger of the buffer layer of the high-voltage cable is rapidly screened, the calculation result of the contact ratio can be reused repeatedly, the method for rapidly screening the cable section with the ablation hidden danger of the buffer layer is convenient to use, and the screening speed is improved.
Description
Technical Field
The invention belongs to the technical field of high voltage and insulation, relates to a hidden danger cable section screening method, and particularly relates to a method for quickly screening an ablation hidden danger cable section of a buffer layer of a high-voltage power cable.
Background
In recent years, the number of faults caused by ablation of a buffer layer of a high-voltage power cable is gradually increased, and the ablation hidden danger of the buffer layer becomes one of important hidden dangers threatening the safety of a power grid. At present, a screening method for a cable section with hidden danger of buffer layer ablation of a high-voltage power cable is still very primary, and a method for summarizing a cable supplier list with faults of the type and listing other cables which are not faulty in the list as hidden danger cables is generally adopted. This approach usually results in a number of high voltage power cables from several suppliers requiring technical modification or replacement, but other supplier products are completely non-hazardous. The screening method does not take into account the technical information of specific cables, on one hand, the hidden dangers of cable products of screened supplier lists are easily overestimated, and on the other hand, the risks of cable products of other suppliers are easily ignored. Therefore, a method for screening ablation risks by combining cable information needs to be developed.
The ablation of the water-blocking buffer layer is generally accompanied by the following two phenomena: (1) the water-blocking buffer layer is affected with damp; (2) the corrugated sheath, buffer layer and insulation shield material are relatively weak in electrical connection. The former can be prevented by enhancing management and control in the cable production stage and the construction stage. The latter is still difficult due to the short time to find a replacement for the combination corrugated aluminum sheath-water-blocking buffer-insulation shielding material. Therefore, on the premise that materials cannot be changed, under the condition that the buffer tape is tightly wrapped on the insulation shielding layer, the contact area between the corrugated sheath and the buffer layer becomes key information for determining the electrical connection between the corrugated sheath and the insulation shielding layer, and a method for screening the ablation hidden danger of the buffer layer can be developed according to the key information.
Neglecting the influence caused by the bending of the cable, the method for intuitively estimating the contact area (hereinafter referred to as the contact area) between the corrugated sheath and the buffer layer is to take the cylindrical area formed by the circle which is coated on the outer side of the buffer layer on the cable and is formed along the axial direction of the cable or the cylindrical area formed by the circle at the position of the wave trough on the inner side of the corrugated sheath and is formed along the axial direction of the cable as the estimated value of the contact area. The premise of the method is that the corrugated sheath is completely and tightly contacted with the buffer layer, and the method is not in accordance with the actual engineering and brings great errors when the electrical connection condition is analyzed. Therefore, the contact area, a key technical parameter, still lacks an effective calculation means, and the solution of the problem mainly has the following challenges:
(1) power cable suppliers commonly use metal corrugated production lines for corrugated sheath production. The technical parameters of the sheath wrinkles are controlled through two production parameters of the wrinkle pitch and the wrinkle depth. This approach does not directly determine the shape parameters of smooth wrinkles typical of the radius of curvature. In addition, the contact with the buffer layer in the axial direction of the cable is generally discontinuous due to the presence of peaks and valleys in the corrugated jacket. These problems present difficulties in mathematical modeling and calculation of the contact area of the corrugated sheath with the cushioning layer.
(2) Currently, the corrugated sheaths and cushioning layers still lack the corresponding standard constraints in terms of dimensional fit. Under the condition of comprehensively considering the requirements of the mechanical strength, the axial water resistance and other properties of the cable, different power cable suppliers adopt different technical schemes on the problem of whether the diameter of the 'wave trough' on the inner side of the corrugated sheath is larger than the diameter of the outer side of the cable containing the buffer layer. Thus, under the action of gravity, the inside of the corrugated sheath above the cable of some suppliers does not come into effective contact with the buffer layer, as shown in fig. 1; the inside of the corrugated sheath over a portion of the supplier's cable is in operative contact with the buffer layer as shown in fig. 2. Clearly, a calculation method that can take both cases into account is needed.
(3) Early cables lack information such as factory test reports, so that basic data of the cables are incomplete, and sufficient information is difficult to provide for calculating the contact area. Therefore, the calculation of the contact area between the corrugated sheath and the buffer layer needs to have the capability of accessing measured data so as to deal with the situation of insufficient cable information.
In order to develop a method for rapidly screening cable sections with potential ablation hazards of a buffer layer of a high-voltage power cable, a means capable of effectively calculating a contact area is needed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method for quickly screening cable sections with potential ablation hazards of a buffer layer of a high-voltage power cable, which can screen cable sections with potential ablation hazards of the buffer layer of the high-voltage cable.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a method for quickly screening cable sections with ablation hidden danger of a buffer layer of a high-voltage power cable comprises the following steps:
and 4, screening the cable section with the buffer layer ablation hidden danger by using the buffer layer ablation hidden danger cable section screening threshold value.
Moreover, the specific implementation method of the step 1 is as follows:
arranging the following data according to a cable factory test report or an actual measurement result: length d of cable segmentcableNominal value, inside radius d of corrugated sheathOANominal value, outside radius d of cable containing buffer layerO’CNominal value, outside radius d of cable containing insulation shieldO’BNominal value, wrinkle pitch dlenNominal value, wrinkle depth ddepNominal value, thinnest point thickness d of buffer layerBB’。
Establishing rho-theta plane polar coordinates in a radial plane of the cable by taking the circle center position O of the corrugated sheath as an origin; o 'is the center position of the core of the cable, the critical points of the buffer layer contacting the corrugated sheath are marked as A and A', on the basis of the rho-theta plane coordinate, a three-dimensional coordinate system rho-theta-Z is established by taking the axial direction of the cable as the Z direction, any point P is taken on the contact curved surface of the buffer layer and the corrugated sheath, and the coordinate is marked as (rho)P,θP0), on a plane where z is 0, taking a ray from an origin O to a point P, and marking an intersection point of the ray and the outer side of the insulation shield as B; the intersection point of the buffer layer and the outer side is marked as C; the intersection point with the inside of the corrugated sheath is denoted as D.
In the axial direction of the cable, the wrinkle curve is approximated by a straight line connecting the wrinkle peak valley positions, and an approximate curved surface of the contact curved surface of the wrinkle sheath and the buffer layer is obtained
The interpolation function within the interval is expressed as
Fourthly, calculating the distance d between the circle center O of the corrugated sheath and the circle center O' of the cable coreOO’；
Judging the contact critical point angle of the corrugated sheath and the buffer layer, if the corrugated sheath is not in contact with the buffer layer above the cable, judging the contact critical point angle of the corrugated sheath and the buffer layer
If the corrugated sheath is in effective contact with the buffer layer over the cable, θA＝π；
Sixthly, calculating the contact area S of the single-wrinkle pitch inner-wrinkle sheath and the buffer layer according to the following formulaV；
Wherein
Is the distance from the origin O to the point C;
seventhly, calculating the total contact area S between the wrinkle sheath and the buffer layer according to the following formulatotal：
Furthermore, the distance d between the center O of the corrugated sheath and the center O' of the cable coreOO’The calculation formula of (2) is as follows:
dOO′＝dOA-dO′B-dBB′。
moreover, the specific implementation method of the step 2 is as follows:
firstly, a set of fault cable sections { l ] under a specified voltage leveli}i＝1，…，nThe method comprises the steps of sorting out cable data information such as factory reports and the like for all i-1, …, n, sorting and collecting data required by calculating the total contact area and the reference area of the corrugated sheath and the buffer layer, and performing fault cable section l with insufficient dataiActually testing the cable section cut out during fault treatment, and supplementing the data required by calculation of the total contact area of the wrinkle sheath and the buffer layer;
② for all fault cable sections l with i equal to 1, …, niEnquiring fault cable section liWhether the contact ratio calculation result is recorded before or not is judged, and the fault cable section l of each specific i-1, …, niIf the contact ratio is present, the result w (l) is savedi) Entering into the third step; otherwise, entering the fourth step;
comparing data required by calculating the total contact area of the corrugated sheath and the buffer layer with historical data for the fault cable section with the number i, comparing data required by calculating the reference area with the historical data, and if the two items of required data are not different from the historical data and a contact ratio storage result exists, taking the contact ratio storage result w (l)i) Otherwise, entering the fourth step;
fourthly, for the fault cable section with the serial number i, the corrugated sheath is connected withThe data required by the calculation of the total contact area of the buffer layer is stored as historical data, so as to calculate the total contact area S of the wrinkle sheath and the buffer layertotal(li) (ii) a The data required for calculating the reference area is stored as history data, and the reference area S is calculated according to the history database(li) (ii) a Then, the contact ratio was calculated according to the following formula to obtain w (l)i) And saving the contact ratio calculation result:
moreover, the specific implementation method of step 3 is as follows:
the summary calculation obtains a fault cable section contact ratio set w (l)i)}i＝1，…，nAnd calculating a screening threshold t of the cable section with the potential ablation hazard of the buffer layer under the voltage level according to the following formula:
moreover, the specific implementation method of the step 4 is as follows:
for { li}i＝1，…，nCable segment set { q ] to be screened at same voltage levelj}j＝1，…，mThe method comprises the steps of sorting cable data information such as factory reports and the like for all j equal to 1, …, m, sorting and collecting data required by calculation of the total contact area and the reference area of a corrugated sheath and a buffer layer, carrying out actual test on cable sections to be screened with insufficient data in the same batch of the same type, and supplementing data required by calculation of the total contact area and the reference area of the corrugated sheath and the buffer layer;
② all the cable sections q to be screened of j 1, …, mjInquiring the cable section q to be screenedjWhether there is a previous record of the contact ratio calculation result. For each specific j-1, …, m cable section q to be screenedjIf the contact ratio storage result exists, entering step three; otherwise, entering the fourth step;
③ to-be-screened of number jCable section qjComparing data required for calculating the total contact area between the wrinkle sheath and the buffer layer with historical data, comparing data required for calculating the reference area with the historical data, and if the two required data are not different from the historical data and a contact ratio storage result exists, taking the contact ratio storage result w (q)j) Entering a fifth step; otherwise, entering the fourth step;
fourthly, the cable section q to be screened of the serial number jjThe data required by the calculation of the total contact area of the wrinkled sheath and the buffer layer is stored as historical data, so that the total contact area S of the wrinkled sheath and the buffer layer is calculatedtotal(qj) The data required for calculating the reference area is stored as history data, and the reference area S is calculatedbase(qj) And saving the calculation result of the contact area, and then calculating the contact ratio according to the following formula to obtain w (q)j) Then entering a fifth step;
fifthly, summarizing and calculating to obtain a cable segment contact ratio set { w (q) } to be screenedj)}j＝1，…，mWhen j is 1, …, m, the following determinations are made: if w (q)j) When t is less than or equal to t, q is addedjAdding the potential hazards into a hidden danger list, otherwise, adding q into the hidden danger listjExcluded from the hidden danger list, enter into sixth;
and sixthly, sorting the output hidden danger list, and screening the cable section with the ablation hidden danger of the cable buffer layer.
The invention has the advantages and positive effects that:
1. according to the method, the contact area between the high-voltage power cable corrugated sheath and the buffer layer can be calculated, the contact ratio between the buffer layer and the corrugated sheath can be calculated according to the contact area between the high-voltage power cable corrugated sheath and the buffer layer, so that the cable section with the ablation hidden danger of the high-voltage cable buffer layer can be screened, the calculation result of the contact ratio can be reused repeatedly, the cable section with the ablation hidden danger of the buffer layer can be screened quickly, and the screening speed is increased.
2. The method provides a list of buffer layer ablation hidden danger cable sections of the cable stock, and provides reference for operation and maintenance of the high-voltage power cable.
Drawings
Fig. 1 is a schematic view of the structure of the cable without contact between the corrugated sheath and the buffer layer.
Fig. 2 is a schematic view of the structure of the cable above where there is contact between the corrugated sheath and the buffer layer.
Fig. 3 is an axial cross-sectional view of the interface of the corrugated sheath and cushioning layer.
Fig. 4 is an axial cross-sectional view of the approximate interface of the corrugated sheath and cushioning layer.
In the figure, 1 denotes the outside of the wrinkled jacket, 2 the inside of the wrinkled jacket, 3 the outside of the cushion layer, 4 the inside of the cushion layer or the outside of the shield layer, 5 the wrinkled jacket, and 6 the cushion layer.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments, which are illustrative only and not limiting, and the scope of the present invention is not limited thereby.
A method for quickly screening cable sections with ablation hidden danger of a buffer layer of a high-voltage power cable comprises the following steps:
In this step, because the corrugated sheath has peak-valley positions, in order to calculate the contact area between the corrugated sheath and the buffer layer, the following basic assumptions meeting the actual engineering need to be made:
1. assuming that the contact area within each corrugation pitch is approximately the same;
2. it is assumed that the effect of the inclination angle of the wrinkles on the contact area is negligible.
At this time, the contact area of the corrugated sheath and the cushion 5 can be divided into the sum of the contact areas of the corrugated sheath and the cushion within each corrugated pitch. Since the individual corrugation pitch is small compared to the total length of the cable segment, the contact area at the ends of the cable within less than one corrugation pitch can be approximated with a corresponding ratio. This gives:
in the formula, StotalIs the total contact area of the cable; sVIs the contact area within a single corrugation pitch; dcableIs the nominal value of the length of the cable segment; dlenIs the nominal value of the corrugation pitch. So to get the total contact area of the cable, the contact area within a single corrugation pitch needs to be calculated.
Considering that the contact surface of the actual corrugated sheath and the buffer layer is a space curved surface, and the center position O of the corrugated sheath is taken as the origin in the radial plane of the cable, the polar coordinate of the rho-theta plane can be established as shown in figure 1. O 'is the centre of a circle of the cable core, and the critical points of the contact of the buffer layer and the corrugated sheath are marked as A and A'. As shown in fig. 3, on the basis of the rho-theta plane coordinate, a three-dimensional coordinate system can be established by taking the axial direction of the cable as the Z direction, and the dotted line part in the figure is a schematic diagram of the contact surface of the buffer layer and the corrugated sheath. Obviously, within one corrugation pitch, if the contact surface function is z ═ f (ρ, θ), the corresponding contact area can be calculated by the following equation:
wherein, Ω ρ θ is a projection of the contact curved surface on the z-0 plane.
Since the analytical expression of f (ρ, θ) is difficult to obtain. The approximate value of the contact area is obtained by performing a surface integral calculation on a continuous micro-approximable function of the Z ═ f (ρ, θ) surface. This patent proposes a single-wrinkle pitch in-contact area approximation calculation method. Because the projection of the contact curved surface on the Z-0 plane is symmetrical by the straight line in the direction of theta-0, and the contact curved surface in the single wrinkle pitch is symmetrical by the Z-0 plane, the calculation of SV only needs to finish the calculation of the curved surface integral multiplied by 4 times in the interval of pi being more than or equal to theta being more than or equal to 0 and Z being more than or equal to 0.
In terms of the integrand, as shown in FIG. 4, an approximate surface can be obtained
The functional expression within the interval is:
wherein d isdepIs the nominal value of the wrinkle depth; dOAIs the nominal value of the inside radius of the corrugated sheath.
Regarding the upper and lower integration limits, as shown in fig. 4, for an arbitrary point P ∈ Ω ρ θ, let its coordinate be (ρ ∈ Ω ρ θ)P，θP). On a plane where z is 0, taking a ray from an origin O to a point P, and marking an intersection point of the ray and the outer side of the insulation shield as B; the intersection point of the buffer layer and the outer side is marked as C; the intersection point with the inside of the corrugated sheath is denoted as D. It is easy to know that the distance between two points of BD has the minimum value in the direction of θ being 0, and is the thinnest point of the buffer layer extruded by gravity, and is marked as dBB’. It can be found that:
dOO′＝dOA-dO′B-dBB′
wherein d isOO’The distance between the two circle centers is shown; dO’BIs the nominal value of the radius of the outer side of the cable containing the insulation shielding.
According to the cosine theorem it can be found that:
wherein d isOCIs the distance from the origin O to the point C; dO’CIs the nominal value of the radius of the outer side of the cable containing the buffer layer. Due to dOC> 0, derived:
it is apparent that the above formula is 0. ltoreq. thetaP≤θAAll intervals are true, θAIs the angle at point a. Note dOAIs the nominal value of the inside radius of the corrugated sheath. It has been found that in the absence of contact between the corrugated sheath and the buffer layer over the cableI.e. dBB′+dO′B+dO′C≤2dOAAt the critical point A of the contact between the wrinkle sheath and the buffer layer, the following points are present:
obviously, in the case of contact between the corrugated sheath and the buffer layer over the cable, i.e. dBB′+dO′B+dO′C＞2dOAWhen there is thetaAPi. The contact area S within a single corrugation pitch can be obtainedVThe approximation two re-integrates the expression:
the expression of univariate definite integral can be obtained by simplifying the formula:
finally, calculating the total contact area S of the wrinkle sheath and the buffer layer according to the following formulatotal：
And the contact area of the wrinkle sheath and the buffer layer is approximately calculated.
The contact area of the corrugated sheath and the buffer layer mainly reflects the contact condition of the cable insulation shield and the corrugated sheath via the buffer layer, but the contact area of the corrugated sheath and the buffer layer on the whole cable depends on the size information of the actual cable section length, the insulation thickness and the like, the size design of high-voltage cables of various cable suppliers is not consistent, and in order to realize comparison of cables with different sizes, the invention provides a method for comparing by using the contact ratio.
On the basis that the contact area can be calculated or estimated, the contact ratio is calculated using the following equation:
wherein w is a contact ratio between the insulation shield and the corrugated sheath; sbaseThe reference area for comparison may be information such as the outer surface area of the insulation shield, the outer surface area of the buffer layer, and the inner surface area of the corrugated sheath.
After the adopted reference area is determined, the hidden danger cable section screening threshold value can be obtained according to the contact ratio information of the fault cable section, and the hidden danger cable section screening threshold value is compared with the contact ratio information of the cable to be screened, so that the conclusion whether the cable to be screened contains the ablation hidden danger of the buffer layer is obtained.
According to actual needs, the rapid screening method for the cable section with the ablation hidden danger of the buffer layer can be operated for multiple times, and the contact ratio calculation result can be repeatedly reused on the premise that input data is not changed; if the contact area is calculated by other applications, the calculation result can be stored so as to facilitate the use of the method for rapidly screening the cable segment with the ablation hidden danger of the buffer layer, thereby improving the screening speed.
The concrete solving steps of the contact ratio of the fault cable section are as follows:
firstly, a set of fault cable sections { l ] under a specified voltage leveli}i＝1，…，nThe method comprises the steps of sorting out cable data information such as factory reports and the like for all i-1, …, n, sorting and collecting data required by calculating the total contact area and the reference area of the corrugated sheath and the buffer layer, and performing fault cable section l with insufficient dataiActually testing the cable section cut out during fault treatment, and supplementing the data required by calculating the total contact area of the wrinkle sheath and the buffer layer
② for all fault cable sections l with i equal to 1, …, niEnquiring fault cable section liWhether the contact ratio calculation result is recorded before or not is judged, and the fault cable section l of each specific i-1, …, niIf the contact ratio is present, the result w (l) is savedi) Entering into the third step; otherwise, the flow enters the fourth step.
Comparing data required by calculating the total contact area of the corrugated sheath and the buffer layer with historical data for the fault cable section with the number i, comparing data required by calculating the reference area with the historical data, and if the two items of required data are not different from the historical data and a contact ratio storage result exists, taking the contact ratio storage result w (l)i) Otherwise, the flow enters the fourth step.
Fourthly, for the fault cable section with the number i, the data required by the calculation of the total contact area of the wrinkled sheath and the buffer layer are stored as historical data, and the total contact area S of the wrinkled sheath and the buffer layer is calculated according to the historical datatotal(li). The data required for calculating the reference area is stored as history data, and the reference area S is calculated according to the history database(li). Then, the contact ratio was calculated according to the following formula to obtain w (l)i) And saves the result of the contact ratio calculation.
And 3, screening a threshold value of the cable section with the ablation hidden danger of the buffer layer according to the contact ratio of the fault cable section.
The specific implementation method of the step is as follows: the summary calculation obtains a fault cable section contact ratio set w (l)i)}i＝1，…，nAnd calculating a screening threshold t of the cable section with the potential ablation hazard of the buffer layer under the voltage level according to the following formula:
and 4, screening the cable section with the buffer layer ablation hidden danger by using the buffer layer ablation hidden danger cable section screening threshold value.
The specific implementation method of the step is as follows:
for { li}i＝1，…，nCable segment set { q ] to be screened at same voltage levelj}j＝1，…，mThe method comprises the steps of sorting cable data information such as factory reports and the like for all j equal to 1, …, m, sorting and collecting data required by calculation of the total contact area and the reference area of a corrugated sheath and a buffer layer, carrying out actual test on cable sections to be screened with insufficient data in the same batch of the same type, and supplementing data required by calculation of the total contact area and the reference area of the corrugated sheath and the buffer layer;
② all the cable sections q to be screened of j 1, …, mjInquiring the cable section q to be screenedjWhether there is a previous record of the contact ratio calculation result. For each specific j-1, …, m cable section q to be screenedjIf the contact ratio storage result exists, entering step three; otherwise, entering the fourth step;
③ to the cable section q to be screened of serial number jjComparing data required for calculating the total contact area between the wrinkle sheath and the buffer layer with historical data, comparing data required for calculating the reference area with the historical data, and if the two required data are not different from the historical data and a contact ratio storage result exists, taking the contact ratio storage result w (q)j) Entering a fifth step; otherwise, entering the fourth step;
fourthly, the cable section q to be screened of the serial number jjThe data required by the calculation of the total contact area of the wrinkled sheath and the buffer layer is stored as historical data, so that the total contact area S of the wrinkled sheath and the buffer layer is calculatedtotal(qj) The data required for calculating the reference area is stored as history data, and the reference area S is calculatedbase(qj) And saving the calculation result of the contact area, and then calculating the contact ratio according to the following formula to obtain w (q)j) Then entering a fifth step;
fifthly, summarizing and calculating to obtain a cable segment contact ratio set { w (q) } to be screenedj)}j＝1，…，mWhen j is 1, …, m, the following determinations are made: if w (q)j) When t is less than or equal to t, q is addedjAdding the potential hazards into a hidden danger list, otherwise, adding q into the hidden danger listjExcluded from the hidden danger list, enter into sixth;
and sixthly, sorting the output hidden danger list, and screening the cable section with the ablation hidden danger of the cable buffer layer.
The effect of the present invention is verified by a specific example.
(1) The first example is as follows:
in the sample, a cable section with potential ablation corrosion hazards of a buffer layer of a 220kV high-voltage power cable is screened. 3 sections of fault cable sections are shared, namely a fault section A, a fault section B and a fault section C; and 4 cable sections to be screened are respectively a first conveying section, a second conveying section, a third conveying section and a third conveying section. All cables have no historical data and previous calculations are saved. Determining the contact ratio calculation using the outside surface area of the dielectric shield as the reference area, at Sbase＝2πdcabledO′B。
And calculating screening threshold values of the cable sections with the ablation hidden danger of the buffer layer.
And 2, for all fault cable sections with insufficient data, actually testing the cable sections cut out during fault processing, supplementing the data required by calculation of the total contact area of the corrugated sheath and the buffer layer, and entering the 3 rd step.
Through the first two steps, the input data of the sorted fault cable set are as follows:
and step 3, inquiring l for all fault cable sections with i equal to 1, … and 3iWhether there is a previous record of the contact ratio calculation result. For each specific fault cable section with i being 1, … and 3, if a contact ratio storage result exists, entering the step 4; otherwise, entering the step 5.
And 5, for the fault cable section with the number i, storing data required by calculation of the total contact area of the wrinkle sheath and the buffer layer and the reference area as historical data, and entering 5.1.
Step 5.1, calculating the distance d between two circle centers by the following formulaOO’. And 5.2, entering the step.
dOO′＝dOA-dO′B-dBB′
Step 5.2, judging d for each fault cable sectionBB′+dO′B+dO′C≤2dOAWhether or not this is true. If yes, the corrugated sheath and the buffer layer are not in contact above the cable, and the contact critical point angle of the corrugated sheath and the buffer layer is
If not, the corrugated sheath on the cable is effectively contacted with the buffer layer, thetaAPi. And 5.3, entering the step.
Step 5.3, calculating the contact area S of the wrinkle sheath and the buffer layer in the single wrinkle pitch according to the following formulaV. And 5.4, entering the step.
Step 5.4, calculating the total contact area S of the wrinkle sheath and the buffer layer according to the following formulatotal. And 5.5, entering the step 5.5.
Step 5.5, then the contact ratio is calculated according to the following formula to obtain w (l)i) And preserve contact withThe ratio calculation results. And 6, entering the step 6.
The above calculation results are collated in the following table:
in this sample, t is calculated to be 13.75%.
And then, carrying out a buffer layer ablation hidden danger cable section screening process.
And step 2, for all the cable segments to be screened with insufficient data, actually testing the same-model same-batch cable segments, filling up the data required by calculation of the total contact area of the wrinkle sheath and the buffer layer and the reference area, and entering step 3.
Through the first two steps, the input data of the cable set to be screened after the arrangement is as follows:
And 5, for the cable segment to be screened with the number j, saving data required by calculation of the total contact area of the wrinkle sheath and the buffer layer and the reference area as historical data, and entering 5.1.
Step 5.1, calculating the distance d between two circle centers by the following formulaOO’. And 5.2, entering the step.
dOO′＝dOA-dO′B-dBB′
Step 5.2, for each cable segment to be screened, judging dBB′+dO′B+dO′C≤2dOAWhether or not this is true. If yes, the corrugated sheath and the buffer layer are not in contact above the cable, and the contact critical point angle of the corrugated sheath and the buffer layer is
If not, the corrugated sheath on the cable is effectively contacted with the buffer layer, thetaAPi. And 5.3, entering the step.
Step 5.3, calculating the contact area S of the wrinkle sheath and the buffer layer in the single wrinkle pitch according to the following formulaV. And 5.4, entering the step.
Step 5.4, calculating the total contact area S of the wrinkle sheath and the buffer layer according to the following formulatotal. And 5.5, entering the step 5.5.
Step 5.5, then the contact ratio is calculated according to the following formula to obtain w (l)i) And saves the result of the contact ratio calculation. And 6, entering the step 6.
The above calculation results are collated in the following table:
And 7, sorting and outputting the hidden danger list to obtain a hidden danger list: { in the first transportation stage, in the second transportation stage }.
(2) Example two:
the scenario of the second example is that on the basis that the screening of the cable section with the potential ablation hazard of the buffer layer of the high-voltage power cable is completed in the first example, the buffer layer at the first transportation section is ablated to cause a fault, and after the data is updated by actual measurement at the fault section at the first transportation section, the screening of the cable section with the potential ablation hazard of the buffer layer needs to be performed again.
And calculating screening threshold values of the cable sections with the ablation hidden danger of the buffer layer.
And 2, for all fault cable sections with insufficient data, actually testing the cable sections cut out during fault processing, filling up the data required by calculation of the total contact area of the corrugated sheath and the buffer layer and the reference area, and entering the 3 rd step.
Through the first two steps, the input data of the sorted fault cable set are as follows:
And 4, comparing data required by calculating the total contact area of the wrinkle sheath and the buffer layer with historical data for the fault cable section with the number i, and comparing the data required by calculating the reference area with the historical data. If the two items of required data are not different from the historical data and the contact ratio storage result exists, the contact ratio storage result w (l) is usedi) Entering the step 6; otherwise, the step 5 is entered.
And 5, for the fault cable section with the number i, storing data required by calculation of the total contact area of the wrinkle sheath and the buffer layer and the reference area as historical data, and entering 5.1.
Step 5.1, calculating the distance d between two circle centers by the following formulaOO’. And 5.2, entering the step.
dOO′＝dOA-dO′B-dBB′
Step 5.2, judging d for each fault cable sectionBB′+dO′B+dO′C≤2dOAWhether or not this is true. If yes, the corrugated sheath and the buffer layer are not in contact above the cable, and the contact critical point angle of the corrugated sheath and the buffer layer is
If not, the corrugated sheath on the cable is effectively contacted with the buffer layer, thetaAPi. And 5.3, entering the step.
Step 5.3, calculating the contact area S of the wrinkle sheath and the buffer layer in the single wrinkle pitch according to the following formulaV. And 5.4, entering the step.
Step 5.4, calculating the total contact area S of the wrinkle sheath and the buffer layer according to the following formulatotal. And 5.5, entering the step 5.5.
Step 5.5, preserving the total contact area S of the wrinkle sheath and the buffer layertotalAnd calculating a result. Then, the contact ratio was calculated according to the following formula to obtain w (l)i) And saves the result of the contact ratio calculation. And 6, entering the step 6.
Obviously, when i is 1, …, 3, the contact ratio has the storage result, and the data required for calculating the total contact area between the wrinkle sheath and the buffer layer and the reference area are not different from the historical data, and w (l) can be directly obtainedi). For i-4, the calculation needs to be carried out in the 5 th step because the data required by the calculation of the total contact area of the wrinkle sheath and the buffer layer and the reference area are different from the historical data. The results are summarized below.
in this example, t is calculated to be 13.89%.
And then, carrying out a buffer layer ablation hidden danger cable section screening process.
And step 2, for all the cable segments to be screened with insufficient data, actually testing the same-model same-batch cable segments, filling up the data required by calculation of the total contact area of the wrinkle sheath and the buffer layer and the reference area, and entering step 3.
Through the first two steps, the input data of the cable set to be screened after the arrangement is as follows:
And 4, comparing data required by calculating the total contact area of the wrinkle sheath and the buffer layer with historical data for the cable section to be screened with the number j, and comparing the data required by calculating the reference area with the historical data. If the two items of required data are not different from the historical data and the contact ratio storage result exists, the contact ratio storage result w (q) is usedj) Entering the step 6; otherwise, the step 5 is entered.
Obviously, for j equal to 1, …, 3, the contact ratio has the storage result and the data required for calculating the total contact area of the wrinkle sheath and the buffer layer is not different from the historical data, and w (l) can be directly obtainedi)。
And 7, sorting and outputting the hidden danger list to obtain a hidden danger list: { in second segment }.
Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments and the accompanying drawings.
Claims (6)
1. A method for quickly screening cable sections with potential ablation hazards of buffer layers of high-voltage power cables is characterized by comprising the following steps of: the method comprises the following steps:
step 1, calculating the total contact area S of the corrugated sheath and the buffer layer of the cabletotal；
Step 2, searching the contact ratio of the corresponding fault cable section in historical data, entering the next step if the contact ratio of the corresponding fault cable section is found, and otherwise, searching the total contact area S between the corrugated sheath and the buffer layertotalCalculating the contact ratio of the fault cable section;
step 3, screening a threshold value of the cable section with the ablation hidden danger of the buffer layer according to the contact ratio of the fault cable section;
and 4, screening the cable section with the buffer layer ablation hidden danger by using the buffer layer ablation hidden danger cable section screening threshold value.
2. The method for rapidly screening cable sections with ablation hidden danger of the buffer layer of the high-voltage power cable according to claim 1, is characterized in that: the specific implementation method of the step 1 comprises the following steps:
arranging the following data according to a cable factory test report or an actual measurement result: length d of cable segmentcableNominal value, inside radius d of corrugated sheathOANominal value, outside radius d of cable containing buffer layerO’CNominal scaleValue of outside radius d of the cable containing the insulation shieldO’BNominal value, wrinkle pitch dlenNominal value, wrinkle depth ddepNominal value, thinnest point thickness d of buffer layerBB’；
Establishing rho-theta plane polar coordinates in a radial plane of the cable by taking the circle center position O of the corrugated sheath as an origin; o 'is the center position of the core of the cable, the critical points of the buffer layer contacting the corrugated sheath are marked as A and A', on the basis of the rho-theta plane coordinate, a three-dimensional coordinate system rho-theta-Z is established by taking the axial direction of the cable as the Z direction, any point P is taken on the contact curved surface of the buffer layer and the corrugated sheath, and the coordinate is marked as (rho)P,θP0), on a plane where z is 0, taking a ray from an origin O to a point P, and marking an intersection point of the ray and the outer side of the insulation shield as B; the intersection point of the buffer layer and the outer side is marked as C; the intersection point of the inner side of the corrugated sheath is marked as D;
in the axial direction of the cable, the wrinkle curve is approximated by a straight line connecting the wrinkle peak valley positions, and an approximate curved surface of the contact curved surface of the wrinkle sheath and the buffer layer is obtained
The interpolation function within the interval is expressed as
Fourthly, calculating the distance d between the circle center O of the corrugated sheath and the circle center O' of the cable coreOO’；
Judging the contact critical point angle of the corrugated sheath and the buffer layer, if the corrugated sheath is not in contact with the buffer layer above the cable, judging the contact critical point angle of the corrugated sheath and the buffer layer
If the corrugated sheath is in effective contact with the buffer layer over the cable, θA＝π；
Sixthly, calculating the contact area S of the single-wrinkle pitch inner-wrinkle sheath and the buffer layer according to the following formulaV；
Wherein
Is the distance from the origin O to the point C;
seventhly, calculating the total contact area S between the wrinkle sheath and the buffer layer according to the following formulatotal：
3. The method for rapidly screening cable sections with ablation hidden danger of the buffer layer of the high-voltage power cable as claimed in claim 2, is characterized in that: the distance d between the center O of the corrugated sheath and the center O' of the cable coreOO’The calculation formula of (2) is as follows:
dOO'＝dOA-dO'B-dBB'。
4. the method for rapidly screening cable sections with ablation hidden danger of the buffer layer of the high-voltage power cable according to claim 1, is characterized in that: the specific implementation method of the step 2 comprises the following steps:
firstly, a set of fault cable sections { l ] under a specified voltage leveli}i＝1,...,nThe method comprises the steps of sorting out cable data information such as factory reports and the like for all i-1, …, n, sorting and collecting data required by calculating the total contact area and the reference area of the corrugated sheath and the buffer layer, and performing fault cable section l with insufficient dataiActually testing the cable section cut out during fault treatment, and supplementing the data required by calculation of the total contact area of the wrinkle sheath and the buffer layer;
② for all fault cable sections l with i equal to 1, …, niEnquiring fault cable section liWhether or not the contact ratio calculation result has been previously recorded, … for each specific i ═ 1N fault cable section liIf the contact ratio is present, the result w (l) is savedi) Entering into the third step; otherwise, entering the fourth step;
comparing data required by calculating the total contact area of the corrugated sheath and the buffer layer with historical data for the fault cable section with the number i, comparing data required by calculating the reference area with the historical data, and if the two items of required data are not different from the historical data and a contact ratio storage result exists, taking the contact ratio storage result w (l)i) Otherwise, entering the fourth step;
fourthly, for the fault cable section with the number i, the data required by the calculation of the total contact area of the wrinkled sheath and the buffer layer are stored as historical data, and the total contact area S of the wrinkled sheath and the buffer layer is calculated according to the historical datatotal(li) (ii) a The data required for calculating the reference area is stored as history data, and the reference area S is calculated according to the history database(li) (ii) a Then, the contact ratio was calculated according to the following formula to obtain w (l)i) And the result of the calculation of the contact ratio is saved,
5. the method for rapidly screening cable sections with ablation hidden danger of the buffer layer of the high-voltage power cable according to claim 4, characterized in that: the specific implementation method of the step 3 is as follows:
the summary calculation obtains a fault cable section contact ratio set w (l)i)}i＝1,...,nAnd calculating a screening threshold t of the cable section with the potential ablation hazard of the buffer layer under the voltage level according to the following formula:
6. the method for rapidly screening cable sections with ablation hidden danger of the buffer layer of the high-voltage power cable according to claim 5, is characterized in that: the specific implementation method of the step 4 comprises the following steps:
for { li}i＝1,...,nCable segment set { q ] to be screened at same voltage levelj}j＝1,...,mThe method comprises the steps of sorting cable data information such as factory reports and the like for all j equal to 1, …, m, sorting and collecting data required by calculation of the total contact area and the reference area of a corrugated sheath and a buffer layer, carrying out actual test on cable sections to be screened with insufficient data in the same batch of the same type, and supplementing data required by calculation of the total contact area and the reference area of the corrugated sheath and the buffer layer;
② all the cable sections q to be screened of j 1, …, mjInquiring the cable section q to be screenedjWhether a contact ratio calculation result is recorded before; for each specific j-1, …, m cable section q to be screenedjIf the contact ratio storage result exists, entering step three; otherwise, entering the fourth step;
③ to the cable section q to be screened of serial number jjComparing data required for calculating the total contact area between the wrinkle sheath and the buffer layer with historical data, comparing data required for calculating the reference area with the historical data, and if the two required data are not different from the historical data and a contact ratio storage result exists, taking the contact ratio storage result w (q)j) Entering a fifth step; otherwise, entering the fourth step;
fourthly, the cable section q to be screened of the serial number jjThe data required by the calculation of the total contact area of the wrinkled sheath and the buffer layer is stored as historical data, so that the total contact area S of the wrinkled sheath and the buffer layer is calculatedtotal(qj) The data required for calculating the reference area is stored as history data, and the reference area S is calculatedbase(qj) And saving the calculation result of the contact area, and then calculating the contact ratio according to the following formula to obtain w (q)j) Then entering a fifth step;
fifthly, summarizing and calculating to obtain a cable segment contact ratio set { w (q) } to be screenedj)}j＝1,...,mWhen j is 1, …, m, the following determinations are made: if w (q)j) When t is less than or equal to t, q is addedjAdding the potential hazards into a hidden danger list, otherwise, adding q into the hidden danger listjExcluded from the hidden danger list, enter into sixth;
and sixthly, sorting the output hidden danger list, and screening the cable section with the ablation hidden danger of the cable buffer layer.
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