Deicing effect analysis method for overhead transmission line

Abstract

The invention relates to the technical field of power systems and maintenance thereof, and discloses an overhead transmission line deicing effect analysis method, which comprises the steps of determining a transmission line deicing mode which comprises manual deicing, unmanned aerial vehicle deicing and empty shell deicing; according to the deicing mode, determining a calculation formula of the deicing operation input cost, the deicing operation personnel input amount and the equipment input amount; based on a preset condition, a deicing worker reference input A and a deicing equipment reference input B of the three deicing modes are obtained through investigation, analysis and measurement; the deicing operation input amount F and the deicing equipment input amount Q are calculated through a formula, and the deicing operation input cost M is calculated; according to the deicing effect analysis method for the overhead transmission line provided by the invention, resources and costs required for deicing under different conditions can be accurately calculated by using the reference input amount and the adjustment coefficient, so that the deicing operation process is optimized, the operation efficiency is improved, and the operation cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of power systems and maintenance thereof, and in particular to a method for analyzing the deicing effectiveness of overhead power transmission lines. Background Art

[0002] In recent years, there has been an increase in extreme rain, snow and freezing weather, and icing on overhead transmission lines has become more and more serious, resulting in an increase in icing failures. Carrying out de-icing operations on overhead transmission lines is an effective measure to prevent icing failures. At present, the main de-icing methods used in power grids include manual de-icing, drone de-icing and air shell de-icing. The cost investment and de-icing efficiency of various de-icing methods are affected by many factors. It is difficult for the operation and maintenance management department to accurately estimate the manpower and material resources required for de-icing work, and thus it is impossible to formulate a scientific, economical and reasonable de-icing operation plan; currently there is a lack of a method that can effectively analyze and estimate the de-icing effectiveness of overhead transmission lines. Therefore, establishing an analysis method for the de-icing effectiveness of overhead transmission lines will help operation and maintenance managers to relatively accurately estimate de-icing investment and select appropriate de-icing methods, thereby providing a scientific and reliable decision-making basis for operation and maintenance managers to carry out de-icing work, which is of great significance to the anti-icing and disaster reduction work of the power grid. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a method for analyzing the effectiveness of deicing of overhead transmission lines, which solves the problem that it is difficult to accurately estimate the manpower and material resources required for deicing work and it is impossible to formulate a scientific, economical and reasonable deicing operation plan.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for analyzing the effectiveness of deicing of overhead transmission lines, characterized in that it includes the following steps:

[0005] (1) Determine the deicing method for overhead transmission lines, which deicing method includes manual deicing, drone deicing, and aerial shell deicing;

[0006] (2) According to the deicing method, the calculation formulas for the deicing operation cost, the number of deicing operation personnel and the amount of deicing equipment are determined, wherein the calculation formulas for the deicing operation cost, the number of deicing operation personnel and the amount of deicing equipment are respectively:

[0007]

[0008] F=I×L×A 【2】

[0009] Q=I×L×B 【3】

[0010] Wherein, M: de-icing operation investment cost, ten thousand yuan;

[0011] M f : De-icing workers’ expenses, RMB 10,000 / man-day;

[0012] M q : De-icing equipment cost, RMB 10,000 per set;

[0013] M x : Additional cost of de-icing, 10,000 yuan;

[0014] F: Number of personnel involved in de-icing operations, man-days;

[0015] Q: De-icing equipment input, set*day;

[0016] A: Basic input of de-icing workers, man-days / km;

[0017] B: Basic investment in de-icing equipment, set*day / km;

[0018] N: service life of de-icing equipment, days;

[0019] L: length of deicing line, km;

[0020] I: adjustment coefficient;

[0021] (3) Based on the preset conditions, the baseline input amount A of de-icing workers and the baseline input amount B of de-icing equipment for the three de-icing methods are calculated through investigation and analysis. The preset conditions include single circuit 35kV

[0022] Lines and conductors are split into single parts, on flat ground, with ice thickness of 5mm and icing type of rime;

[0023] (4) According to the influence of voltage level, number of loops, number of conductor splits, terrain, ice thickness and ice type on de-icing efficiency, the de-icing efficiency in various situations is corrected by adjusting the coefficient I;

[0024] (5) The de-icing operation personnel input F and de-icing equipment input Q are calculated by formulas [2] and [3], and the de-icing operation input cost M is calculated by formula [1];

[0025] (6) Based on the calculated de-icing operation personnel input F, de-icing equipment input Q, de-icing operation investment M, as well as the personnel and equipment reserves and de-icing time requirements, etc., select the appropriate de-icing method and the input of de-icing operation personnel and equipment.

[0026] Optionally, the determination of the adjustment coefficient I needs to consider the voltage level adjustment coefficient I1, the loop number adjustment coefficient I2, the wire split number adjustment coefficient I3, the terrain category adjustment coefficient I4, the ice thickness adjustment coefficient I5 and the ice type adjustment coefficient I6. The calculation formula of the adjustment coefficient I is:

[0027] I=I1I2I3I4I5I6【4】.

[0028] Optionally, the de-icing personnel fee M f 、De-icing equipment cost M q The specific value of the de-icing equipment service life N is determined based on actual market research and equipment usage.

[0029] Optionally, when calculating the de-icing operation cost M, if there is additional special cost M x , and incorporate it into the calculation to improve the accuracy of cost calculation.

[0030] Optionally, the method is applicable to the deicing effectiveness analysis of the ground wire of the operating 35kV to 500kV overhead transmission lines using three deicing methods: manual deicing, drone deicing and aerial shell deicing.

[0031] The present invention provides a method for analyzing the effectiveness of deicing of overhead transmission lines, which has the following beneficial effects:

[0032] By confirming the basic conditions of the routes that need deicing, the present invention can quickly estimate the deicing personnel, deicing equipment and total deicing investment costs required for the three deicing methods of manual deicing, drone deicing and empty shell deicing. The operation and maintenance management personnel can comprehensively consider the calculated investment amount, personnel and equipment reserves and deicing time requirements, and select the appropriate deicing method and deicing personnel and equipment investment, thereby providing a scientific and reliable decision-making basis for carrying out deicing work. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A de-icing operation plan flow chart is developed for the present invention. DETAILED DESCRIPTION

[0034] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0035] See also Figure 1 The present invention provides a technical solution: a method for analyzing the effectiveness of deicing of overhead transmission lines, characterized in that it comprises the following steps:

[0036] (1) Determine the deicing method for overhead transmission lines, which deicing method includes manual deicing, drone deicing, and aerial shell deicing;

[0037] (2) According to the deicing method, the calculation formulas for the deicing operation cost, the number of deicing operation personnel and the amount of deicing equipment are determined, wherein the calculation formulas for the deicing operation cost, the number of deicing operation personnel and the amount of deicing equipment are respectively:

[0038]

[0039] F=I×L×A 【2】

[0040] Q=I×L×B 【3】

[0041] Wherein, M: de-icing operation investment cost, ten thousand yuan;

[0042] M f : De-icing workers’ expenses, RMB 10,000 / man-day;

[0043] M q : De-icing equipment cost, RMB 10,000 per set;

[0044] M x : Additional cost of de-icing, 10,000 yuan;

[0045] F: Number of personnel involved in de-icing operations, man-days;

[0046] Q: De-icing equipment input, set*day;

[0047] A: Basic input of de-icing workers, man-days / km;

[0048] B: Basic investment in de-icing equipment, set*day / km;

[0049] N: service life of de-icing equipment, days;

[0050] L: length of deicing line, km;

[0051] I: adjustment coefficient;

[0052] (3) Based on the preset conditions, the baseline input amount A of de-icing workers and the baseline input amount B of de-icing equipment for the three de-icing methods are calculated through investigation and analysis. The preset conditions include single circuit 35kV

[0053] Lines and conductors are single-split, flat-bottomed, ice thickness is 5mm, and ice type is rime;

[0054] (4) According to the influence of voltage level, number of loops, number of conductor splits, terrain, ice thickness and ice type on de-icing efficiency, the de-icing efficiency in various situations is corrected by adjusting the coefficient I;

[0055] (5) The de-icing operation personnel input F and de-icing equipment input Q are calculated by formulas [2] and [3], and the de-icing operation input cost M is calculated by formula [1];

[0056] (6) Based on the calculated de-icing operation personnel input F, de-icing equipment input Q, de-icing operation investment M, as well as the personnel and equipment reserves and de-icing time requirements, etc., select the appropriate de-icing method and the input of de-icing operation personnel and equipment.

[0057] Based on the conditions of a single-circuit 35 kV line, a single split conductor, flat ground, an ice thickness of 5 mm, and an ice type of rime, the benchmark investment amounts for the three de-icing methods were calculated through investigation and analysis as shown in Table 1.

[0058] Table 1: Baseline inputs

[0059]

[0060] The determination of the adjustment coefficient I needs to consider the voltage level adjustment coefficient I1, the loop number adjustment coefficient I2, the wire split number adjustment coefficient I3, the terrain category adjustment coefficient I4, the ice thickness adjustment coefficient I5 and the ice type adjustment coefficient I6. The calculation formula of the adjustment coefficient I is:

[0061] I=I1I2I3I4I5I6【4】.

[0062] Voltage level, number of loops, number of conductor splits, terrain, ice thickness and ice type have a great influence on de-icing efficiency. The de-icing efficiency in various situations is corrected by adjustment coefficients. The adjustment coefficients of various influencing factors of the three de-icing methods are calculated through investigation and analysis as shown in Tables 2 to 7.

[0063] Table 2: Voltage level adjustment coefficient I1

[0064]

[0065] Table 3: Loop number adjustment factor I2

[0066]

[0067] Table 4: Wire split number adjustment factor I3

[0068]

[0069] Table 5: Terrain type adjustment factor I4

[0070]

[0071] Table 6: Ice thickness adjustment factor I5

[0072]

[0073] Table 7: Icing type adjustment factor I6

[0074]

[0075]

[0076] The de-icing operation personnel cost Mf 、De-icing equipment cost M q The specific value of the de-icing equipment service life N is determined based on actual market research and equipment usage.

[0077] In practical applications, the de-icing personnel cost M f 、De-icing equipment cost M q The determination of the service life N of deicing equipment requires comprehensive consideration of factors such as market conditions, equipment performance, maintenance costs, and operator skill level. For example, for deicing operator costs M f , a comprehensive assessment needs to be made based on factors such as the average wage level in the region, the difficulty of the operation, and the operating environment. q It is necessary to consider the equipment purchase cost, operation and maintenance costs, depreciation rate, etc. The service life N of the deicing equipment is related to the material, design life, and actual frequency and intensity of use of the equipment.

[0078] When calculating the de-icing operation cost M, if there are additional special expenses M x , and incorporate it into the calculation to improve the accuracy of cost calculation.

[0079] The method is applicable to the deicing effectiveness analysis of the ground wire of the 35kV to 500kV overhead transmission lines in operation when three deicing methods, namely, manual deicing, drone deicing and air shell deicing, are used for deicing.

[0080] In this embodiment, the deicing operation cost M, the deicing operation personnel cost M f 、De-icing equipment cost M q , the service life of the de-icing equipment N and possible special expenses M x By taking factors such as temperature, humidity, and humidity into consideration, the de-icing effect of different de-icing methods can be quantitatively analyzed. Through comparative analysis, it can be evaluated which de-icing method performs better in terms of economy, efficiency, and safety under specific conditions, providing scientific decision-making support for de-icing operations of transmission lines.

[0081] The specific implementation steps of the present invention are as follows:

[0082] (1) Determine the baseline deicing personnel input A and the baseline deicing equipment input B according to the deicing method to be used, referring to Table 1;

[0083] (2) Confirm the voltage level, number of circuits, number of splits, terrain type, ice thickness and ice type of the line to be de-iced, and confirm the adjustment coefficients respectively with reference to Tables 2 to 7;

[0084] (3) Calculate the adjustment coefficient I by referring to formula [4] based on the adjustment coefficient values ​​confirmed in step (2);

[0085] (4) The values ​​of A, B and I calculated and determined by steps (1) and (3) are combined with the length L of the deicing line to be deiced, and the amount of deicing workers F is calculated using formula [2], and the amount of deicing equipment Q is calculated using formula (3);

[0086] (5) Using the F and Q values ​​calculated in step (4), calculate the de-icing operation cost M using formula [1].

[0087] By calculating the de-icing operation personnel input F, de-icing equipment input Q and de-icing operation investment cost M, combined with the de-icing personnel and equipment reserves, the total de-icing investment cost is considered to be optimal while meeting the de-icing time requirements, so as to reasonably formulate a de-icing operation plan.

[0088] This embodiment takes the line voltage level of 220kV, double circuit, 2 split conductors, hilly terrain, line ice thickness of 10mm, ice type of mixed frost, and deicing line length of 5km as the preset conditions for the line to be deiced as an example to specifically illustrate the implementation method.

[0089] According to the deicing conditions of the line, refer to Tables 2 to 7 to determine the value of the adjustment coefficient I. The coefficients are as follows:

[0090] Table 8: Values ​​of adjustment factor I

[0091]

[0092] According to Table 1, Table 8 and the line length of 5 km, the deicing personnel input F and deicing equipment input Q under different deicing methods are calculated. The calculation results are as follows:

[0093] Table 9: Calculation results of de-icing personnel input F and de-icing equipment input Q

[0094]

[0095] Assume that the charging principle in this example is as follows: labor cost is 11200 yuan / man-day; manual deicing equipment is 15,000 yuan / set, and the equipment service life is 5 years and 1825 days; UAV deicing equipment is 200,000 yuan / set, and the equipment service life is 2 years and 730 days; air shell deicing equipment is 30,000 yuan / set; the equipment service life is 3 years and 1095 days. Other costs include safety measures cost of 10,000 yuan.

[0096] According to the assumed charging principle, the cost input M of manual deicing, drone deicing and empty shell deicing is calculated. The calculation results are as follows:

[0097] Table 10: Cost investment M for three deicing methods

[0098] Artificial de-icing Drone de-icing Empty shell de-icing De-icing cost (10,000 yuan) 5.84 2.16 5.52

[0099] According to the comparison of personnel input in Table 9 and de-icing costs in Table 10, de-icing operations can be formulated according to different situations. The following are three examples:

[0100] ①1① If there are sufficient de-icing personnel and various de-icing equipment, drone de-icing should be given priority as the lowest-cost de-icing method.

[0101] ② If there are not enough de-icing personnel, only 50 people, the minimum de-icing time required for various de-icing methods can be calculated, and the corresponding number of de-icing equipment needs to be configured. The specific data is as follows:

[0102] Table 11: Minimum deicing time and minimum number of deicing equipment required for the three deicing methods

[0103] Minimum de-icing time (daily) Minimum number of de-icing equipment (sets) Artificial de-icing 8.61 2.49 Drone de-icing 1.15 16.41 Empty shell de-icing 7.61 12.50

[0104] ③ If deicing is required to be completed within 4 hours (0.5 days) to ensure power supply, the minimum number of personnel and deicing equipment required for various deicing methods can be calculated based on the total deicing operation input F and Q. The specific data are as follows:

[0105] Table 12: Personnel and equipment input

[0106]

[0107] Select the appropriate de-icing method based on the personnel and equipment reserves. For example, if the personnel reserves are sufficient, but the UAV de-icing and air shell de-icing equipment are insufficient, and the manual de-icing equipment is sufficient, after comprehensive consideration, the manual de-icing method can be selected, and the number of de-icing personnel shall be no less than 861 and the number of de-icing equipment shall be no less than 43 sets.

[0108] By confirming the basic conditions of the routes requiring deicing, the present invention can quickly estimate the deicing personnel, deicing equipment and total deicing investment costs required under the three deicing methods of manual deicing, unmanned aerial vehicle deicing and empty shell deicing. The operation and maintenance management personnel can comprehensively consider the calculated investment amount, personnel and equipment reserves and deicing time requirements, and select the appropriate deicing method and deicing personnel and equipment investment, thereby providing a scientific and reliable decision-making basis for carrying out deicing work.

[0109] Finally, it should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements. The above detailed description of the specific implementation methods provided by the present invention, the principles and implementation methods of the present invention are explained in this article using specific examples, and the description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for analyzing the effectiveness of deicing of overhead transmission lines, characterized in that: The following steps are involved: (1) Determine the deicing method for overhead transmission lines, including manual deicing, drone deicing, and aerial shell deicing; (2) According to the deicing method, the calculation formulas for the deicing operation cost, the number of deicing operation personnel and the amount of deicing equipment are determined, wherein the calculation formulas for the deicing operation cost, the number of deicing operation personnel and the amount of deicing equipment are respectively: 【1】 【2】 【3】 Wherein, M: de-icing operation investment cost, ten thousand yuan; M f : De-icing workers’ expenses, RMB 10,000 / man-day; M q : De-icing equipment cost, RMB 10,000 per set; M x : Additional cost of de-icing, 10,000 yuan; F: Number of personnel involved in de-icing operations, man-days; Q: De-icing equipment input, set*day; A: Basic input of de-icing workers, man-days / km; B: Basic investment in de-icing equipment, set*day / km; N: service life of de-icing equipment, days; L: length of deicing line, km; I: adjustment coefficient; (3) Based on the preset conditions, the baseline input of de-icing workers A and the baseline input of de-icing equipment B for the three de-icing methods are calculated through investigation and analysis. The preset conditions include single-circuit 35kV line, single split of conductor, flat ground, ice thickness of 5mm, and ice type of rime; (4) According to the influence of voltage level, number of loops, number of conductor splits, terrain, ice thickness and ice type on de-icing efficiency, the de-icing efficiency in various situations is corrected by adjusting the coefficient I; (5) The de-icing operation personnel input F and de-icing equipment input Q are calculated by formulas [2] and [3], and the de-icing operation cost M is calculated by formula [1]; (6) Based on the calculated de-icing personnel input F, de-icing equipment input Q, de-icing operation cost M, personnel and equipment reserve situation, and de-icing time requirements, etc., select the appropriate de-icing method and the input of de-icing personnel and equipment.

2. The method for analyzing the deicing effectiveness of overhead power transmission lines according to claim 1, characterized in that: The determination of the adjustment coefficient I needs to consider the voltage level adjustment coefficient I1, the loop number adjustment coefficient I2, the wire split number adjustment coefficient I3, the terrain category adjustment coefficient I4, the ice thickness adjustment coefficient I5 and the ice type adjustment coefficient I6. The calculation formula of the adjustment coefficient I is: 【4】。 3. The method for analyzing the deicing effectiveness of overhead power transmission lines according to claim 1, characterized in that: The de-icing operation personnel cost M f 、De-icing equipment cost M q The specific value of the de-icing equipment service life N is determined based on actual market research and equipment usage.

4. The method for analyzing the deicing effectiveness of overhead power transmission lines according to claim 1, characterized in that: When calculating the de-icing operation cost M, if there are additional special expenses M x , and incorporate it into the calculation to improve the accuracy of cost calculation.

5. The method for analyzing the deicing effectiveness of overhead power transmission lines according to claim 1, characterized in that: The method is applicable to the deicing effectiveness analysis of the deicing of the ground wire of the 35kV to 500kV overhead transmission lines in operation using three deicing methods: manual deicing, drone deicing and aerial shell deicing.

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