CN112763849A - Rapid ablation hidden danger cable segment screening method based on buffer layer outer surface area - Google Patents
Rapid ablation hidden danger cable segment screening method based on buffer layer outer surface area Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to a method for rapidly screening ablation hidden danger cable sections based on the outer surface area of a buffer layer, which is technically characterized by comprising the following steps of: approximately calculating the surface area of the outer side of the buffer layer of the high-voltage power cable according to the area of the contact part of the single-wrinkle-pitch inner-wrinkle sheath and the buffer layer and the area of the non-contact part of the single-wrinkle-pitch inner-wrinkle sheath and the buffer layer; according to the outer surface area of the buffer layer of the high-voltage power cable, the contact ratio of the fault cable section recorded in historical data is used for calculating the screening threshold of the buffer layer ablation hidden danger cable section, and the buffer layer ablation hidden danger cable section is rapidly screened through the screening threshold of the buffer layer ablation hidden danger cable section. According to the method, the outer surface area of the buffer layer of the high-voltage power cable is calculated, the function of rapidly screening the cable section with the ablation hidden danger of the buffer layer is realized, the method can be used for evaluating the performance of the high-voltage power cable under the condition that the corrugated sheath and the buffer layer are matched in size, a list of the cable section with the ablation hidden danger of the buffer layer of the cable stock is provided, and a reference is provided for operation and maintenance of the high-voltage.
Description
Technical Field
The invention belongs to the technical field of high voltage and insulation, and particularly relates to a method for quickly screening ablation hidden danger cable sections based on the outer surface area of a buffer layer.
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.
In general, the ablation of a 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 method 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.
How to calculate the surface area of the outer side of the buffer layer of the high-voltage power cable and quickly screen the cable section with the ablation hidden danger of the buffer layer of the high-voltage power cable is a problem which needs to be solved urgently at present.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for quickly screening ablation hidden danger cable sections based on the outer surface area of a buffer layer, which is reasonable in design, quick and accurate.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a method for rapidly screening ablation hidden danger cable sections based on the outer surface area of a buffer layer comprises the following steps:
step 1, approximately calculating the outer surface area of the buffer layer of the high-voltage power cable according to the contact part area of the single-wrinkle-pitch inner-wrinkle sheath and the buffer layer and the non-contact part area of the single-wrinkle-pitch inner-wrinkle sheath and the buffer layer;
and 2, calculating a screening threshold of the cable section with the ablation hidden danger of the buffer layer according to the outer surface area of the buffer layer of the high-voltage power cable and the contact ratio of the fault cable section recorded in the historical data, and quickly screening the cable section with the ablation hidden danger of the buffer layer through the screening threshold of the cable section with the ablation hidden danger of the buffer layer.
Moreover, the specific implementation method of the step 1 is as follows:
step 1.1, according to a cable factory test report or an actual measurement result, arranging to obtain the following data: 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’；
Step 1.2, calculating the distance d between two circle centers according to the following formulaOO’：
dOO′＝dOA-dO′B-dBB′
Step 1.3, judging dBB’+dO‘B+dO’C≤2dOAIf yes, the corrugated sheath and the buffer layer are not contacted 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, thetaA＝π，θ′A＝π；
Step 1.4, calculating the contact part area S of the wrinkle sheath and the buffer layer in the single wrinkle pitch according to the following formulaV(ii) a Calculating the area S of the non-contact part by using a numerical integration methodU；
Step 1.5, calculating according to the following formula to obtain the surface area S of the outer side of the buffer layerco：
Moreover, the method for calculating the screening threshold of the cable section with the ablation hidden danger of the buffer layer in the step 2 comprises the following steps:
the method comprises the steps of collecting { l ] fault cable segments under a specified voltage leveli}i＝1,...,nArranging factory cable data information, arranging contact area and data required by the calculation method of the surface area outside the buffer layer, and if the data are insufficient, performing the steps; otherwise, entering the step three;
for a fault cable section with insufficient data, actually testing the cable section taken out during fault processing, supplementing the data required by the contact area calculation method, and entering the step three;
all pairs of i ═ 1, …, n, query liIf the contact ratio storage result exists for each specific i 1, …, n, the process proceeds to step four; otherwise entering step fifthly;
fourthly, comparing the data required by the contact area calculation method with historical data, comparing the data required by the buffer layer outer surface area calculation method with 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 (l)i) Entering the step VI; otherwise, entering step fife;
fifthly, storing data required by the contact area calculation method into historical data for the fault cable section with the number i, calculating the total contact area according to the historical data, and obtaining Stotal(li) Storing the data required by the buffer layer outer surface area calculation method as historical data, calculating the buffer layer outer surface area according to the historical data, and obtaining Sco(li) Then calculating and storing the contact ratio w (l) of the fault cable sectioni)：
Sixthly, calculating and obtaining a fault cable segment contact ratio set { w (l)i)}i＝1,...,nAnd calculating to obtain a screening threshold t of the cable section with the potential ablation hazard of the buffer layer under the voltage level:
moreover, the method for rapidly screening the cable section with the ablation hidden danger of the buffer layer in the step 2 comprises the following steps:
first pair and { li}i＝1,...,nCable segment set { q ] to be screened at same voltage levelj}j＝1,...,mSorting factory cable data information for all j ═ 1, …, m, collecting data required by a contact area and buffer layer outer side surface area calculation method, and if the data are insufficient, performing the second step; otherwise, entering the step three;
for cable segments to be screened with insufficient data, actually testing the same-model same-batch cable segments, supplementing the data required by the calculation method of the contact area and the surface area of the outer side of the buffer layer, and entering the step three;
c, query q for all pairs of j-1, …, mjIf the contact ratio calculation result is recorded before, and j is 1, …, m for each specific, and if the contact ratio storage result is present, the process proceeds to step four; otherwise entering step fifthly;
fourthly, comparing the data required by the contact area calculation method with historical data of the cable segment to be screened with the serial number j, comparing the data required by the buffer layer outer side surface area calculation method 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 a contact ratio storage result w (q) of the cable segment to be screenedj) Entering the step VI; otherwise, entering step fife;
fifthly, storing the data required by the contact area calculation method into historical data for the cable section to be screened with the serial number j, calculating the total contact area to obtain Stotal(qj) (ii) a Storing data required by the buffer layer outer surface area calculation method as historical data, calculating the buffer layer outer surface area according to the historical data, and obtaining Sco(qj) (ii) a Then calculating the contact ratio w (q) of the cable segment to be screened according to the following formulaj)：
Sixthly, calculating and obtaining 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;entering step-quietness;
and (5) finishing the output hidden danger list and screening the cable sections with the ablation hidden dangers of the cable buffer layer.
The invention has the advantages and positive effects that:
the method is reasonable in design, the outer surface area of the buffer layer of the high-voltage power cable is approximately calculated, the screening threshold of the cable section with the ablation hidden danger of the buffer layer is calculated according to the contact ratio of the fault cable section recorded in historical data, the function of rapidly screening the cable section with the ablation hidden danger of the buffer layer is further realized, the method can be used for performing performance evaluation on the matching condition of the sizes of the corrugated sheath and the buffer layer of the high-voltage power cable, the list of the cable section with the ablation hidden danger of the buffer layer of the cable stock is provided, and reference is provided.
Drawings
FIG. 1 is a schematic view of a condition of no contact between the corrugated sheath and the buffer layer over the cable;
FIG. 2 is a schematic view of the presence of contact between the corrugated jacket and the buffer layer over the cable;
FIG. 3 is an axial cross-sectional view of the interface of the corrugated sheath and cushioning layer;
FIG. 4 shows the approximate contact surface between the corrugated sheath and the buffer layer at θ ═ θPA plan sectional view;
FIG. 5 shows the approximate contact surface between the corrugated sheath and the buffer layer at θ ═ θ'PA plan sectional view.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A method for rapidly screening ablation hidden danger cable sections based on the outer surface area of a buffer layer comprises the following steps:
step 1, approximately calculating the surface area of the outer side of the buffer layer of the high-voltage power cable.
The method for approximately calculating the surface area of the outer side of the buffer layer of the high-voltage power cable is carried out based on the following principle:
1. calculated decomposition of outside surface area of buffer layer
The outside surface area of the buffer layer is mainly composed of two parts: (1) the contact surface area of the portion actually fitting to the corrugated sheath; (2) the surface area of the portion not conforming to the corrugated sheath. Therefore, the calculation of the outer surface area of the buffer layer requires the calculation of the contact area. Because of the peak-valley position of the corrugated sheath, the following basic assumptions in accordance with engineering practice need to be made for calculating the contact area of the corrugated sheath and the buffer layer:
assume that the contact area within each corrugation pitch is approximately the same;
the effect of the inclination angle of the corrugations on the contact area is assumed to be negligible.
At this time, the contact area of the cushioning layer and the corrugated sheath can be decomposed into the sum of the contact areas of the cushioning layer and the corrugated sheath in each corrugated pitch. Since a corrugation pitch is small compared to the total length of the cable segment, the contact area at the ends of the cable less than one corrugation pitch can be approximated in corresponding proportions. The buffer layer surface area can likewise be decomposed, from which it is possible to obtain:
in the formula, ScoThe surface area of the outer side of the buffer layer; sVThe surface area of the contact part of the outer side of the buffer layer and the corrugated sheath in the single corrugated pitch; sUThe surface area of the part, which is not contacted with the corrugated sheath, of the outer side of the buffer layer in the single corrugated pitch; dlenIs the nominal value of the corrugation pitch. So to obtain the overall buffer outside surface area of the cable, the surface area of the contacted and non-contacted portions within a single corrugation pitch needs to be calculated.
2. Approximate calculation of the contact area of the cushioning layer and the corrugated sheath within a single corrugation pitch
Considering that the contact surface of the actual buffer layer and the corrugated sheath is a space curved surface, and taking the circle center position O of the corrugated sheath as an origin point in a radial plane of the cable, a rho-theta plane polar coordinate 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.
As is clear from the description of the background art, the analytical expression of f (ρ, θ) is difficult to obtain. An approximation of the contact area is obtained by performing a surface integral calculation on a continuous, differentiable approximation function of the z ═ f (ρ, θ) surface. This patent proposes a single-wrinkle pitch in-contact area approximation calculation method. As shown in fig. 4, the corrugated curve is approximated by a straight line connecting the peak and valley positions of the corrugated line in the axial direction of the cable, and an approximate curved surface (hereinafter referred to as an approximate curved surface) of the contact curved surface of the corrugated sheath and the buffer layer can be obtained. Since the projection of the approximate curved surface on the plane z equal to 0 is symmetrical with the straight line in the direction θ equal to 0, and the approximate curved surface within the single wrinkle pitch is symmetrical with the plane z equal to 0, S is calculatedVThe approximate value of (a) is only required 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,0). On the plane (z-0), the ray is taken from the origin O to the point P and intersects with the outside of the insulating shieldThe point is marked 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; the critical positions of the corrugated sheath in contact with the buffer layer in the single corrugated pitch are E, F two points respectively. 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’Is the distance between the two circle centers.
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:
note thetaAIs the angle at point A, it is apparent that the above formula is 0 ≦ θP≤θAThe intervals are all true. It can be found that in the case of no contact between the corrugated sheath and the buffer layer over the cable, i.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. Then the approximate contact area within a single corrugation pitch can be found by a double-definite integral expression:
the expression of univariate definite integral can be obtained by simplifying the formula:
3. approximate calculation of the area of the non-contact part of the cushioning layer and the corrugated sheath in the single corrugated pitch
As shown in FIG. 4, the non-contacting portions of the individual corrugated pitch inner cushion layer and corrugated jacket eliminate the portions of the cylindrical surface affected by the contact curve for the outer cylindrical portion of the cushion layer. Translating the rho-theta-Z coordinate system along the direction of theta-0 by dOO’Distance, with O ' as the origin, may establish a three-dimensional coordinate system of ρ ' - θ ' -Z, as shown in FIG. 5. At this time, the P point coordinate is (ρ'P,θ′P,0). From the cosine theorem it can be found that:
due to dOC>0, so d can be obtainedOCExpression in ρ '- θ' -Z coordinate system:
when theta 'is theta'PIn the ρ - θ -Z coordinate system, the portion of the cylindrical surface affected by the contact curved surface is θ ═ θPThe distance d between two points corresponding to E, F on the planeEFThe following can be obtained:
in terms of integration upper and lower limits, record θ'AIs rho '-theta' -ZThe angle at point a is plotted. It can be found that in the case of no contact between the corrugated sheath and the buffer layer over the cable, i.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>2dOAThen, there is θ'APi. The area integral expression of the buffer layer and the wrinkle sheath non-contact part in a single wrinkle pitch can be obtained as follows:
the above formula definite integral can not guarantee to have an analytic solution, and can be solved by a numerical integration method. Numerical integration methods such as a trapezoidal method, a Simpson's rule, a Newton-Cowster formula, a Longbeige method, a Gaussian integration method, a Chebyshev integration method, a Monte Carlo integration method and the like and improved forms thereof can be used for solving the integration, so that an approximate value of the area of the part, not contacted with the wrinkle sheath, of the buffer layer in a single wrinkle pitch is obtained, and further the result of the surface area of the outer side of the whole cable buffer layer is obtained.
Based on the principle, the approximate calculation method for the surface area of the outer side of the buffer layer of the high-voltage power cable comprises the following steps:
step 1.1, according to a cable factory test report or an actual measurement result, arranging to obtain the following data: 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’。
Step 1.2, calculating the distance d between the two circle centers according to the following formulaOO’。
dOO′＝dOA-dO′B-dBB′
Step 1.3, 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, thetaA＝π，θ′A＝π。
Step 1.4, calculating the contact part area S of the wrinkle sheath and the buffer layer in the single wrinkle pitch according to the following formulaV(ii) a Calculating the area S of the non-contact part by using a numerical integration methodU。
Step 1.5, calculating the surface area S of the outer side of the buffer layer according to the following formulaco。
The method can be applied to obtain the approximate surface area value of the buffer layer of the newly-delivered cable according to the dimension nominal value information on the cable delivery test report. The method can be used for carrying out approximate calculation on the surface area of the buffer layer of the operated cable by using the measured data of the cable.
And 2, rapidly screening the cable section with the ablation hidden danger of the buffer layer of the high-voltage power cable according to the surface area of the outer side of the buffer layer of the high-voltage power cable.
The contact area of the corrugated sheath and the buffer layer on the whole cable depends on the size information of the length of the actual cable segment, the thickness of insulation and the like, and the size design of the high-voltage cable of each cable supplier is not consistent. Since the contact area mainly reflects the contact condition of the buffered layer between the cable insulation shield and the corrugated sheath, in order to realize the comparison of cables with different sizes, the invention provides a method for performing comparison 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; scoIs the outside surface area of the buffer layer.
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 to obtain a conclusion whether the cable to be screened contains the ablation hidden danger of the buffer layer.
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.
Based on the above description, the specific implementation method of this step includes the following steps:
step 2.1, calculating a screening threshold value of the cable section with the ablation hidden danger of the buffer layer, wherein the specific method comprises the following steps:
the method comprises the steps of collecting { l ] fault cable segments under a specified voltage leveli}i＝1,...,nFor all i-1, …, n, cable data information such as factory report is arranged and finishedThe data required by the calculation method of the contact area and the surface area of the outer side of the buffer layer are calculated, and if the data are insufficient, the second step is carried out; otherwise, entering the step three.
And secondly, for all fault cable sections with insufficient data, actually testing the cable sections cut out during fault processing, supplementing the data required by the contact area calculation method, and entering the step three.
All pairs of i ═ 1, …, n, query liWhether there is a previous record of the contact ratio calculation result. If the contact ratio storage result is present for each specific i 1, …, n, the process proceeds to step four; otherwise entering step fife.
And fourthly, comparing data required by the contact area calculation method with historical data for the fault cable section with the number i, and comparing data required by the buffer layer outer side surface area calculation method with 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 VI; otherwise, entering step fife.
Fifthly, storing data required by the contact area calculation method into historical data for the fault cable section with the number i, calculating the total contact area according to the historical data, and obtaining Stotal(li). Storing data required by the buffer layer outer surface area calculation method as historical data, calculating the buffer layer outer surface area according to the historical data, and obtaining Sco(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. Entering the step sixteenth.
Sixthly, calculating and obtaining a fault cable segment contact ratio set { w (l)i)}i＝1,...,nAnd calculating to obtain the screening threshold t of the cable section with the ablation hidden danger of the buffer layer under the voltage level according to the following formula.
Step 2.2, screening the cable section with the ablation hidden danger of the buffer layer, wherein the specific method comprises the following steps:
first pair and { li}i＝1,...,nCable segment set { q ] to be screened at same voltage levelj}j＝1,...,mFor all j ═ 1, …, m, cable data information such as factory reports and the like is arranged, data required by the contact area and the calculation method of the surface area of the outer side of the buffer layer are collected, and if the data are insufficient, the second step is carried out; otherwise, entering the step three.
And secondly, for the cable sections to be screened with insufficient data, actually testing the same-model same-batch cable sections, supplementing the data required by the calculation method of the contact area and the surface area of the outer side of the buffer layer, and entering the step three.
C, query q for all pairs of j-1, …, mjWhether there is a previous record of the contact ratio calculation result. If the contact ratio storage result is present for each specific j 1, …, m, the process proceeds to step four; otherwise entering step fife.
Fourthly, comparing the data required by the contact area calculation method with historical data of the cable segment to be screened with the serial number j, and comparing the data required by the buffer layer outer side surface area calculation method 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 VI; otherwise, entering step fife.
Fifthly, storing the data required by the contact area calculation method into historical data for the cable section to be screened with the serial number j, calculating the total contact area to obtain Stotal(qj). Storing data required by the buffer layer outer surface area calculation method as historical data, calculating the buffer layer outer surface area according to the historical data, and obtaining Sco(qj). Then, the contact ratio calculation was performed according to the following formula to obtain w (q)j). Entering the step sixteenth.
Sixthly, calculating and obtaining 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. Step-wise is entered.
The output hidden danger list is trimmed. And finishing screening the cable section with the ablation hidden danger of the cable buffer layer.
The effect of the invention is verified by two examples below:
example 1
In the example, a cable section with ablation corrosion hidden danger 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.
Firstly, screening threshold value calculation is carried out on cable sections with ablation hidden troubles of the buffer layer.
Step 1, collecting fault cable sections { l) under 220kV leveli}i＝1,...,3Arranging cable data information such as factory reports and the like for all the i-1, … and 3, arranging data required by the calculation method of the contact area and the outer surface area of the buffer layer, and entering the step 2 if the data are insufficient; otherwise, entering the step 3.
And 2, for all fault cable sections with insufficient data, actually testing the cable sections intercepted during fault processing, supplementing the data required by the calculation method, and entering the step 3.
Through the first two steps, the input data of the sorted fault cable set are as follows:
step 3, inquiring l for all i equal to 1, …,3iWhether there is a previous record of the contact ratio calculation result. For each specific i-1, …,3, if there is a contact ratio holdAnd if so, entering the step 4; otherwise, entering the step 5.
And 5, storing the data required by the calculation method of the contact area and the surface area of the outer side of the buffer layer as historical data for the fault cable section with the number i, calculating the contact area, and entering the step 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, thetaA＝π，θ′APi. And 5.3, entering the step.
Step 5.3, calculating the contact part area S of the wrinkle sheath and the buffer layer in the single wrinkle pitch according to the following formulaV(ii) a Calculating the area S of the non-contact part by using a numerical integration methodU. And 5.4, entering the step.
Step 5.4, calculating the surface area S of the outer side of the buffer layer according to the following formulaco. And (5) after the surface area of the buffer layer is calculated, 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:
step 6, summarizing and calculating to obtain a fault cable section contact ratio set { w (l)i)}i＝1,...,3And calculating the screening threshold t of the potential electrochemical corrosion hazard cable section of the buffer layer under the voltage level according to the following formula:
in this example, t is calculated to be 12.54%.
And then carrying out a screening process of the cable section with the ablation hidden danger of the buffer layer.
Step 1, for a 220kV voltage level cable segment set to be screened { qj}j＝1,...,4Sorting out cable data information such as factory reports and the like for all j equal to 1, … and 4, collecting data required by a calculation method of the contact area and the outer surface area of the buffer layer, and entering the step 2 if the data are insufficient; otherwise, entering the step 3.
And 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 the contact area and the buffer layer outer side surface area calculation method, and entering the step 3.
Through the first two steps, the input data of the cable set to be screened after the arrangement is as follows:
step 3, inquiring q for all j equal to 1, …,4jWhether there is a previous record of the contact ratio calculation result. For each specific j-1, …,4, the result is saved since there is no contact ratio, and step 5 is entered.
And 5, storing the data required by the calculation method of the contact area and the surface area of the outer side of the buffer layer as historical data for the cable segment to be screened with the number j, calculating the contact area, and entering the step 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, thetaA＝π，θ′APi. And 5.3, entering the step.
Step 5.3, calculating the contact part area S of the wrinkle sheath and the buffer layer in the single wrinkle pitch according to the following formulaV(ii) a Calculating the area S of the non-contact part by using a numerical integration methodU. And 5.4, entering the step.
Step 5.4, calculating the surface area S of the outer side of the buffer layer according to the following formulaco. And (5) after the surface area of the buffer layer is calculated, entering the step 5.5.
Step 5.5, then the contact ratio calculation is carried out according to the following formula to obtain w (q)j) 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:
step 6, summarizing and calculating to obtain a cable segment contact ratio set { w (q) to be screenedj)}j＝1,...,4For all j equal to 1, …,4, the following determinations are made: if w (q)j) Q is less than or equal to 12.54, then q is addedjAdding the potential hazards into a hidden danger list, otherwise, adding q into the hidden danger listjExcluded from the hidden danger list. And 7, entering the step.
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 }.
Example 2
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.
Step 1, collecting fault cable sections { l) under 220kV voltage leveli}i＝1,...,4Arranging cable data information such as factory reports and the like for all the i-1, … and 4, arranging data required by the calculation method of the contact area and the outer surface area of the buffer layer, and entering the step 2 if the data are insufficient; otherwise, entering the step 3.
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 the calculation method of the contact area and the surface area of the outer side of the buffer layer, and entering the step 3.
Through the first two steps, the input data of the sorted fault cable set are as follows:
step 3, inquiring l for all i equal to 1, …,4iWhether there is a previous record of the contact ratio calculation result. For each specific i ═ 1, …,4, the result is saved as there is a contact ratio, and step 4 is entered.
And 4, comparing data required by the contact area calculation method with historical data and comparing data required by the buffer layer outer side surface area calculation method with the historical data for the fault cable section with the number i. 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, storing the data required by the calculation method of the contact area and the surface area of the outer side of the buffer layer as historical data for the fault cable section with the number i, calculating the contact area, and entering the step 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, thetaA＝π，θ′APi. And 5.3, entering the step.
Step 5.3, calculating the contact part area S of the wrinkle sheath and the buffer layer in the single wrinkle pitch according to the following formulaV(ii) a Calculating the area S of the non-contact part by using a numerical integration methodU. And 5.4, entering the step.
Step 5.4, calculating the surface area S of the outer side of the buffer layer according to the following formulaco. And (5) after the surface area of the buffer layer is calculated, 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.
Obviously, … for i ═ 1And 3, the contact ratio has a storage result, the data required by the calculation method of the contact area and the outer surface area of the buffer layer is 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 contact area and the buffer layer outer surface area calculation method are different from the historical data. The results are summarized below.
The above calculation results are collated in the following table:
step 6, summarizing and calculating to obtain a fault cable section contact ratio set { w (l)i)}i＝1,...,4And calculating the screening threshold t of the potential electrochemical corrosion hazard cable section of the buffer layer under the voltage level according to the following formula:
in this example, t is calculated to be 13.28%.
And then, carrying out a buffer layer ablation hidden danger cable section screening process.
Step 1, for a 220kV voltage level cable segment set to be screened { qj}j＝1,...,3Sorting out cable data information such as factory reports and the like for all j equal to 1, … and 3, collecting data required by a calculation method of the contact area and the outer surface area of the buffer layer, and entering the step 2 if the data are insufficient; otherwise, entering the step 3.
And 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 the contact area and the buffer layer outer side surface area calculation method, and entering the step 3.
Through the first two steps, the input data of the cable set to be screened after the arrangement is as follows:
step 3, inquiring q for all j equal to 1, …,3jWhether there is a previous record of the contact ratio calculation result. For each specific j-1, …,3, the result is saved due to the presence of the contact ratio and step 4 is entered.
And 4, comparing the data required by the contact area calculation method with historical data for the cable section to be screened with the serial number j, and comparing the data required by the buffer layer outer side surface area calculation method 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, when j is 1, …,3, the contact ratio has a storage result and the data required by the contact area calculation method is not different from the historical data, and w (q) can be directly obtainedj)。
Step 6, summarizing and calculating to obtain a cable segment contact ratio set { w (q) to be screenedj)}j＝1,...,3For all j equal to 1, …,3, the following determinations are made: if w (q)j) Q is less than or equal to 13.28, then q isjAdding the potential hazards into a hidden danger list, otherwise, adding q into the hidden danger listjExcluded from the hidden danger list. And 7, entering the step.
And 7, sorting and outputting the hidden danger list to obtain a hidden danger list: { in second segment }.
It should be emphasized that the embodiments described herein are illustrative rather than restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also includes other embodiments that can be derived from the technical solutions of the present invention by those skilled in the art.
Claims (4)
1. A method for rapidly screening ablation hidden danger cable sections based on the outer surface area of a buffer layer is characterized by comprising the following steps: the method comprises the following steps:
step 1, approximately calculating the outer surface area of the buffer layer of the high-voltage power cable according to the contact part area of the single-wrinkle-pitch inner-wrinkle sheath and the buffer layer and the non-contact part area of the single-wrinkle-pitch inner-wrinkle sheath and the buffer layer;
and 2, calculating a screening threshold of the cable section with the ablation hidden danger of the buffer layer according to the outer surface area of the buffer layer of the high-voltage power cable and the contact ratio of the fault cable section recorded in the historical data, and quickly screening the cable section with the ablation hidden danger of the buffer layer through the screening threshold of the cable section with the ablation hidden danger of the buffer layer.
2. The method for rapidly screening ablation hidden danger cable sections based on the outer surface area of the buffer layer as claimed in claim 1, wherein: the specific implementation method of the step 1 comprises the following steps:
step 1.1, according to a cable factory test report or an actual measurement result, arranging to obtain the following data: 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’；
Step 1.2, calculating the distance d between two circle centers according to the following formulaOO’：
dOO′＝dOA-dO′B-dBB′
Step 1.3, judging dBB’+dO‘B+dO’C≤2dOAIf yes, the corrugated sheath and the buffer layer are not contacted 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, thetaA＝π，θ′A＝π；
Step 1.4, calculating the contact part area S of the wrinkle sheath and the buffer layer in the single wrinkle pitch according to the following formulaV(ii) a Calculating the area S of the non-contact part by using a numerical integration methodU；
Step 1.5, calculating according to the following formula to obtain the surface area S of the outer side of the buffer layerco：
3. The method for rapidly screening ablation hidden danger cable sections based on the outer surface area of the buffer layer as claimed in claim 1, wherein: the method for calculating the screening threshold of the cable section with the ablation hidden danger of the buffer layer in the step 2 comprises the following steps:
the method comprises the steps of collecting { l ] fault cable segments under a specified voltage leveli}i＝1,...,nArranging factory cable data information, arranging contact area and data required by the calculation method of the surface area outside the buffer layer, and if the data are insufficient, performing the steps; otherwise, entering the step three;
for a fault cable section with insufficient data, actually testing the cable section taken out during fault processing, supplementing the data required by the contact area calculation method, and entering the step three;
all pairs of i ═ 1, …, n, query liIf the contact ratio storage result exists for each specific i 1, …, n, the process proceeds to step four; otherwise entering step fifthly;
fourthly, comparing the data required by the contact area calculation method with historical data, comparing the data required by the buffer layer outer surface area calculation method with 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 (l)i) Entering the step VI; otherwise, entering step fife;
fifthly, storing data required by the contact area calculation method into historical data for the fault cable section with the number i, calculating the total contact area according to the historical data, and obtaining Stotal(li) Storing the data required by the buffer layer outer surface area calculation method as historical data, calculating the buffer layer outer surface area according to the historical data, and obtaining Sco(li) Then calculating and storing the contact ratio w (l) of the fault cable sectioni)：
Sixthly, calculating and obtaining a fault cable segment contact ratio set { w (l)i)}i＝1,...,nAnd calculating to obtain a screening threshold t of the cable section with the potential ablation hazard of the buffer layer under the voltage level:
4. the method for rapidly screening ablation hidden danger cable sections based on the outer surface area of the buffer layer as claimed in claim 1, wherein: the method for rapidly screening the cable section with the ablation hidden danger of the buffer layer in the step 2 comprises the following steps:
first pair and { li}i＝1,...,nCable segment set { q ] to be screened at same voltage levelj}j＝1,...,mTo, forAll j is 1, …, m, sorting factory cable data information, collecting data required by a contact area and buffer layer outer surface area calculation method, and if the data are insufficient, performing the second step; otherwise, entering the step three;
for cable segments to be screened with insufficient data, actually testing the same-model same-batch cable segments, supplementing the data required by the calculation method of the contact area and the surface area of the outer side of the buffer layer, and entering the step three;
c, query q for all pairs of j-1, …, mjIf the contact ratio calculation result is recorded before, and j is 1, …, m for each specific, and if the contact ratio storage result is present, the process proceeds to step four; otherwise entering step fifthly;
fourthly, comparing the data required by the contact area calculation method with historical data of the cable segment to be screened with the serial number j, comparing the data required by the buffer layer outer side surface area calculation method 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 a contact ratio storage result w (q) of the cable segment to be screenedj) Entering the step VI; otherwise, entering step fife;
fifthly, storing the data required by the contact area calculation method into historical data for the cable section to be screened with the serial number j, calculating the total contact area to obtain Stotal(qj) (ii) a Storing data required by the buffer layer outer surface area calculation method as historical data, calculating the buffer layer outer surface area according to the historical data, and obtaining Sco(qj) (ii) a Then calculating the contact ratio w (q) of the cable segment to be screened according to the following formulaj)：
Sixthly, calculating and obtaining 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; entering step-quietness;
and (5) finishing the output hidden danger list and screening the cable sections with the ablation hidden dangers of the cable buffer layer.
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Address after: No. 8, Haitai Huake 4th Road, Huayuan Industrial Zone, High tech Zone, Binhai New Area, Tianjin, 300384 Patentee after: ELECTRIC POWER SCIENCE & RESEARCH INSTITUTE OF STATE GRID TIANJIN ELECTRIC POWER Co. Patentee after: STATE GRID TIANJIN ELECTRIC POWER Co. Patentee after: STATE GRID CORPORATION OF CHINA Address before: No.8, Haitai Huake 4th Road, Xiqing District, Tianjin 300384 Patentee before: ELECTRIC POWER SCIENCE & RESEARCH INSTITUTE OF STATE GRID TIANJIN ELECTRIC POWER Co. Patentee before: STATE GRID TIANJIN ELECTRIC POWER Co. Patentee before: STATE GRID CORPORATION OF CHINA |