CN102915387A - Power grid ice region distribution diagram drawing method - Google Patents

Abstract

Translated fromChinese

本发明提供一种电网冰区分布图绘制方法，包括以下步骤：收集数据；计算不同重现期的设计冰厚；微地形订正覆冰厚度；绘制所述电网冰区分布图；订正所述电网冰区分布图。该方法为输电线路规划、设计、运维和改造提供依据和指导，明确了冰区等级划分及相应的色标，有利于电网冰区分布图的实际应用，制定了电网冰区分布图的精细化订正方法，有助于衡量微地形、微气象对冰区划分结果的影响。

The invention provides a method for drawing the distribution map of the ice area of the power grid, which includes the following steps: collecting data; calculating the designed ice thickness in different return periods; correcting the thickness of the ice covered by micro-topography; drawing the distribution map of the ice area of the power grid; correcting the power grid Map of ice distribution. This method provides the basis and guidance for transmission line planning, design, operation and maintenance, and transformation, and clarifies the classification of ice areas and the corresponding color codes, which is conducive to the practical application of the distribution map of ice areas in the power grid. The revised method helps to measure the impact of micro-topography and micro-meteorology on the results of ice area division.

Description

Translated fromChinese

一种电网冰区分布图绘制方法A method for drawing ice distribution map of power grid

技术领域technical field

本发明属于电网防灾减灾技术领域，具体涉及一种电网冰区分布图绘制方法。The invention belongs to the technical field of power grid disaster prevention and reduction, and in particular relates to a method for drawing a power grid ice area distribution map.

背景技术Background technique

合理地确定输电线路设计冰厚一直是线路设计工作面临的重要问题，直接关系到线路的抗冰负荷能力和投资。可见，能够定量给出区域覆冰分布情况的冰区图是进行线路抗冰设计的有效工具和依据。由于电网冰害事故的不断出现，要求必须根据覆冰情况对线路进行针对性的设计，既要适度地提高抗冰设计标准，又要考虑到经济技术要求而不能造成浪费；此外，冰区图也能够在一定程度反映区域覆冰情况，对线路管理和运行也具有一定的参考价值，有助于进一步增强电网抵御自然灾害的能力，具有巨大的经济和社会价值。因此，制定电网冰区图的绘制方法是一项极为迫切和关键的工作。Reasonably determining the design ice thickness of transmission lines has always been an important issue in line design work, which is directly related to the anti-icing load capacity and investment of lines. It can be seen that the ice area map that can quantitatively show the distribution of regional ice coverage is an effective tool and basis for anti-icing design of lines. Due to the continuous occurrence of ice damage accidents in the power grid, it is required to carry out targeted design on the line according to the icing situation. It is necessary to moderately improve the anti-icing design standard and take into account the economic and technical requirements so as not to cause waste; in addition, the ice area diagram It can also reflect the regional icing situation to a certain extent, and has a certain reference value for line management and operation, which will help to further enhance the ability of the power grid to resist natural disasters, and has huge economic and social value. Therefore, it is an extremely urgent and critical task to formulate a drawing method for power grid ice area map.

现有技术中“陕西省冰区划分”（电网技术，第34卷第4期，2010年4月，陕西省冰区划分，吴素良、范建勋、宋丽莉、毛明策、孙娴；）利用气象数据与电线积冰数据，建立了各种气象要素与电力覆冰厚度的回归模型，推算出电线覆冰厚度，利用皮尔逊Ⅲ型分布计算了陕西省50a一遇电线积冰厚度，并将覆冰厚度订正至20米高处，绘制了陕西省50a一遇冰区分布图。但是，该文献提供的冰区分布图绘制方法中，典型导线的选取、具体冰厚等级划分等不符合气象部门的勘测规范以及电力部门颁布的设计规范，未根据实际输电线路的运行经验对统计出的不同重现期设计冰厚进行订正，降低了冰区分布图的实用性。In the prior art, "Division of Ice Regions in Shaanxi Province" (Power Grid Technology, Volume 34, Issue 4, April 2010, Division of Ice Regions in Shaanxi Province, Wu Suliang, Fan Jianxun, Song Lili, Mao Mingce, Sun Xian;) using meteorological data and wires Based on the icing data, the regression model of various meteorological elements and the ice thickness of electric power was established, and the ice thickness of the wire was calculated. The ice thickness of the power line in Shaanxi Province was calculated by using the Pearson III distribution, and the ice thickness was corrected. At a height of 20 meters, the distribution map of the 50-year ice-encounter area in Shaanxi Province was drawn. However, in the drawing method of the ice area distribution map provided by this document, the selection of typical conductors and the classification of specific ice thickness levels do not conform to the survey specifications issued by the meteorological department and the design specifications promulgated by the power department. Therefore, the design ice thickness for different return periods is corrected, which reduces the practicability of the ice distribution map.

发明内容Contents of the invention

为了克服上述现有技术的不足，本发明提供一种电网冰区分布图绘制方法，为输电线路规划、设计、运维和改造提供依据和指导。In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a method for drawing a distribution map of the ice area of the power grid, which provides basis and guidance for the planning, design, operation and maintenance and transformation of transmission lines.

为了实现上述发明目的，本发明采取如下技术方案：In order to realize the above-mentioned purpose of the invention, the present invention takes the following technical solutions:

一种电网冰区分布图绘制方法，所述方法包括以下步骤：A method for drawing a grid ice area distribution map, said method comprising the following steps:

步骤1：收集数据；Step 1: Collect data;

步骤2：计算不同重现期的设计冰厚；Step 2: Calculate the design ice thickness for different return periods;

步骤3：微地形订正覆冰厚度；Step 3: Micro-topographic correction of ice thickness;

步骤4：绘制所述电网冰区分布图；Step 4: draw the ice distribution map of the power grid;

步骤5：订正所述电网冰区分布图。Step 5: Revise the grid ice distribution map.

所述步骤1中，数据包括本地区输电线路设计与运行经验数据、本地区历年冬季逐日气象资料数据和本地区数字高程模型及地形图底图资料数据。In the step 1, the data includes the design and operation experience data of transmission lines in the region, the daily weather data in winter in the region over the years, the digital elevation model and the topographic map base map data in the region.

所述本地区输电线路设计与运行经验数据包括运行330kV及以上电压等级的输电线路走廊的设计冰厚、验算冰厚、经纬度和地形信息，以及输电线路实测覆冰处的经纬度、覆冰类型、覆冰厚度和地形信息；The data on the design and operation experience of transmission lines in this region include the designed ice thickness, checked ice thickness, latitude and longitude, and terrain information of transmission line corridors operating at voltage levels of 330kV and above, as well as the measured latitude and longitude of ice-covered places on transmission lines, ice-covered types, Ice thickness and terrain information;

所述本地区历年冬季逐日气象资料数据包括本地区地面气象观测站历年冬季逐日气象资料数据以及本地区具有电线覆冰资料的地面气象观测站的逐日覆冰资料数据；所述本地区地面气象观测站历年冬季逐日气象资料数据包括日平均气温、日最高气温、日最低气温、日平均相对湿度、日平均水汽压、日降水量、日照时数和日平均风速，所述本地区具有电线覆冰资料的地面气象观测站的逐日覆冰资料包括覆冰冰重和覆冰长短径。The daily weather data data of the winter in this region include the daily weather data data of the surface meteorological observation stations in the region and the daily ice data data of the ground meteorological observation stations with wire icing data in the region; the surface meteorological observation data in the region The daily meteorological data of the station in winter over the years include daily average temperature, daily maximum temperature, daily minimum temperature, daily average relative humidity, daily average water vapor pressure, daily precipitation, sunshine hours and daily average wind speed. The daily icing data of surface meteorological observation stations include the ice weight and the length and length of ice.

所述步骤2包括以下步骤：Described step 2 comprises the following steps:

步骤2-1：将地面气象观测站的覆冰资料转化为标准冰厚；Step 2-1: Convert the ice cover data from surface meteorological observation stations into standard ice thickness;

步骤2-2：将标准冰厚进行高度及线径订正；Step 2-2: Correct the height and wire diameter of the standard ice thickness;

步骤2-3：根据覆冰资料计算设计冰厚。Step 2-3: Calculate the design ice thickness according to the icing data.

所述步骤2-1中，当南北向覆冰厚度与东西向覆冰厚度不同时，取覆冰厚度较大者；具有实测冰重的覆冰资料选取根据冰重数据进行标准冰厚转化，具有实测覆冰长短径的覆冰资料根据覆冰长短径进行标准冰厚转化。In the step 2-1, when the ice thickness in the north-south direction is different from the ice thickness in the east-west direction, take the one with the larger ice thickness; select the ice data with actual measured ice weight to convert the standard ice thickness according to the ice weight data, The ice-covered data with measured ice-covered length and short-axis are transformed into standard ice thickness according to the ice-covered length and short-axis.

所述步骤2-2中，将标准冰厚订正为离地高度为10米、直径为26.8毫米、且不带电、非扭转的导线上的覆冰冰厚。In the step 2-2, the standard ice thickness is corrected to be the ice thickness on a wire with a height of 10 meters above the ground, a diameter of 26.8 mm, and an uncharged and non-twisted wire.

所述步骤2-3中，通过采用多元逐步线性回归法统计覆冰厚度与各相关的气象参量间的关系模型，并将该模型推广至地面气象观测站，利用相应的气象参量记录，计算地面气象观测站相应的历史覆冰冰厚，进而，根据极值Ⅰ型、Gumble分布或者皮尔逊Ⅲ型统计模型计算地面气象观测站所在位置不同重现期的设计冰厚。In the steps 2-3, the relationship model between the ice thickness and each relevant meteorological parameter is counted by using the multivariate stepwise linear regression method, and the model is extended to the ground meteorological observation station, and the corresponding meteorological parameter records are used to calculate the ground The corresponding historical ice thickness of the meteorological observation station, and then, according to the extreme value type I, Gumble distribution or Pearson type III statistical model, calculate the design ice thickness of different return periods at the location of the surface meteorological observation station.

所述步骤3中，根据具有覆冰观测业务的地面气象观测站的分布情况，将绘图范围进一步细化为网格状区域，划分后的单个网格内应包含至少一个地面气象观测站，将网格内根据地面气象站点数据计算得到的不同重现期的设计冰厚作为标准值，根据海拔高程数据，计算不同高程内的微地形覆冰厚度。In the step 3, according to the distribution of the surface meteorological observation stations with ice-covered observation services, the drawing range is further refined into a grid-like area, and at least one surface meteorological observation station should be included in the divided single grid. The design ice thickness of different return periods calculated based on the data of surface meteorological stations in the grid is used as the standard value, and the micro-topographic ice thickness at different elevations is calculated according to the altitude data.

所述步骤4中，采用空间插值法将微地形影响订正后的覆冰厚度进行空间插值，并绘制电网冰区分布图；所述空间插值法包括克里格插值法。In the step 4, the spatial interpolation method is used to perform spatial interpolation on the corrected ice thickness due to the influence of micro-topography, and a distribution map of the ice area of the power grid is drawn; the spatial interpolation method includes Kriging interpolation method.

所述步骤5中，对在运行线路覆冰事故点实测覆冰进行质量控制并将实测覆冰厚度转化为标准冰厚，比较所述标准冰厚与所述电网冰区分布图显示的事故点的设计冰厚，结合气候、地形、海拔和水体对所绘电网冰区分布图进行订正。In the step 5, quality control is carried out on the measured icing at the icing accident point of the operating line, and the measured icing thickness is converted into a standard ice thickness, and the standard ice thickness is compared with the accident point shown in the ice area distribution map of the power grid Based on the designed ice thickness, the ice area distribution map drawn by the power grid is corrected in combination with climate, topography, altitude and water body.

与现有技术相比，本发明的有益效果在于：Compared with prior art, the beneficial effect of the present invention is:

1、针对覆冰资料的不同，规定了相应的计算不同重现期设计冰厚的处理方式，便于各地区根据实际情况选用；1. According to the different ice covering data, the corresponding processing methods for calculating the design ice thickness of different return periods are stipulated, which is convenient for each region to choose according to the actual situation;

2、规定了折算覆冰厚度的典型导线，符合气象部门的观测规范和电力部门的设计规范，提高了电网冰区分布图的实用性；2. The typical conductors for calculating the ice thickness are specified, which conforms to the observation specifications of the meteorological department and the design specifications of the power department, and improves the practicability of the ice area distribution map of the power grid;

3、制定了根据在运行线路设计冰厚以及覆冰事故点覆冰资料等实际运行经验对冰区分布图进行订正的方法；3. Formulate a method for revising the ice area distribution map based on the actual operation experience such as the designed ice thickness of the operating line and the icing data of the icing accident point;

4、明确了冰区等级划分及相应的色标，有利于电网冰区分布图的实际应用；4. Clarified the classification of ice areas and the corresponding color codes, which is conducive to the practical application of the ice area distribution map of the power grid;

5、制定了电网冰区分布图的精细化订正方法，有助于衡量微地形、微气象对冰区划分结果的影响。5. Formulated a refined correction method for the ice area distribution map of the power grid, which is helpful to measure the influence of micro-topography and micro-meteorology on the results of ice area division.

附图说明Description of drawings

图1是电网冰区分布图绘制方法流程图。Fig. 1 is a flowchart of a method for drawing a distribution map of ice areas in a power grid.

具体实施方式Detailed ways

下面结合附图对本发明作进一步详细说明。The present invention will be described in further detail below in conjunction with the accompanying drawings.

如图1，一种电网冰区分布图绘制方法，所述方法包括以下步骤：As shown in Figure 1, a method for drawing a power grid ice area distribution map, the method includes the following steps:

步骤1：收集数据；Step 1: Collect data;

步骤2：计算不同重现期的设计冰厚；Step 2: Calculate the design ice thickness for different return periods;

步骤3：微地形订正覆冰厚度；Step 3: Micro-topographic correction of ice thickness;

步骤4：绘制所述电网冰区分布图；Step 4: draw the ice distribution map of the power grid;

步骤5：订正所述电网冰区分布图。Step 5: Revise the grid ice distribution map.

所述步骤1中，数据包括本地区输电线路设计与运行经验数据、本地区历年冬季逐日气象资料数据和本地区数字高程模型及地形图底图资料数据。In the step 1, the data includes the design and operation experience data of transmission lines in the region, the daily weather data in winter in the region over the years, the digital elevation model and the topographic map base map data in the region.

所述本地区输电线路设计与运行经验数据包括运行330kV及以上电压等级的输电线路走廊的设计冰厚、验算冰厚、经纬度和地形信息，以及输电线路实测覆冰处的经纬度、覆冰类型、覆冰厚度和地形信息；The data on the design and operation experience of transmission lines in this region include the designed ice thickness, checked ice thickness, latitude and longitude, and terrain information of transmission line corridors operating at voltage levels of 330kV and above, as well as the measured latitude and longitude of ice-covered places on transmission lines, ice-covered types, Ice thickness and terrain information;

所述本地区历年冬季逐日气象资料数据包括本地区地面气象观测站历年冬季（11月1日至次年3月31日）逐日气象资料数据以及本地区具有电线覆冰资料的地面气象观测站的逐日覆冰资料数据；所述本地区地面气象观测站历年冬季逐日气象资料数据包括日平均气温、日最高气温、日最低气温、日平均相对湿度、日平均水汽压、日降水量、日照时数和日平均风速，所述本地区具有电线覆冰资料的地面气象观测站的逐日覆冰资料包括覆冰冰重和覆冰长短径。The daily meteorological data of the winter in this region include the daily meteorological data of the surface meteorological observation stations in the region in winter (November 1 to March 31 of the following year) and the data of the surface meteorological observation stations with wire icing data in this region. Daily icing data; the daily weather data of the surface meteorological observation stations in the region over the years include daily average temperature, daily maximum temperature, daily minimum temperature, daily average relative humidity, daily average water vapor pressure, daily precipitation, and sunshine hours And the daily average wind speed, the daily icing data of ground meteorological observation stations with power line icing data in this area include ice weight and ice length and short path.

收集本地区数字高程模型和地形图底图资料数据。其中，地形图底图应与本地区数字高程模型资料匹配。Collect digital elevation model and topographic map base map data in this area. Among them, the base map of the topographic map should match the digital elevation model data of the area.

所述步骤2包括以下步骤：Described step 2 comprises the following steps:

步骤2-1：将地面气象观测站的覆冰资料转化为标准冰厚；Step 2-1: Convert the ice cover data from surface meteorological observation stations into standard ice thickness;

步骤2-2：将标准冰厚进行高度及线径订正；Step 2-2: Correct the height and wire diameter of the standard ice thickness;

步骤2-3：根据覆冰资料计算设计冰厚。Step 2-3: Calculate the design ice thickness according to the icing data.

所述步骤2-1中，当南北向覆冰厚度与东西向覆冰厚度不同时，取覆冰厚度较大者；具有实测冰重的覆冰资料选取根据冰重数据进行标准冰厚转化，具有实测覆冰长短径的覆冰资料根据覆冰长短径进行标准冰厚转化。In the step 2-1, when the ice thickness in the north-south direction is different from the ice thickness in the east-west direction, take the one with the larger ice thickness; select the ice data with actual measured ice weight to convert the standard ice thickness according to the ice weight data, The ice-covered data with measured ice-covered length and short-axis are transformed into standard ice thickness according to the ice-covered length and short-axis.

所述步骤2-2中，将标准冰厚订正为离地高度为10米、直径为26.8毫米、且不带电、非扭转的导线上的覆冰冰厚。In the step 2-2, the standard ice thickness is corrected to be the ice thickness on a wire with a height of 10 meters above the ground, a diameter of 26.8 mm, and an uncharged and non-twisted wire.

所述步骤2-3中，本地区地面气象观测站的覆冰观测历史年代序列较短时，通过采用多元逐步线性回归法统计覆冰厚度与各相关的气象参量间的关系模型，并将该模型推广至地面气象观测站，利用相应的气象参量记录，计算地面气象观测站相应的历史覆冰冰厚，进而，根据极值Ⅰ型、Gumble分布或者皮尔逊Ⅲ型统计模型计算地面气象观测站所在位置不同重现期的设计冰厚。In the step 2-3, when the ice-covered observation history sequence of the ground meteorological observation station in this area is relatively short, the relationship model between the ice-covered thickness and each relevant meteorological parameter is calculated by using the multivariate stepwise linear regression method, and the The model is extended to surface meteorological observation stations, using the corresponding meteorological parameter records to calculate the corresponding historical ice thickness of surface meteorological observation stations, and then calculate the location of surface meteorological observation stations according to extreme value type I, Gumble distribution or Pearson type III statistical models Design ice thickness for different return periods at different locations.

所述步骤3中，根据具有覆冰观测业务的地面气象观测站的分布情况，将绘图范围进一步细化为网格状区域，划分后的单个网格内应包含至少一个地面气象观测站，将网格内根据地面气象站点数据计算得到的不同重现期的设计冰厚作为标准值，根据海拔高程数据，计算不同高程内的微地形覆冰厚度。In the step 3, according to the distribution of the surface meteorological observation stations with ice-covered observation services, the drawing range is further refined into a grid-like area, and at least one surface meteorological observation station should be included in the divided single grid. The design ice thickness of different return periods calculated based on the data of surface meteorological stations in the grid is used as the standard value, and the micro-topographic ice thickness at different elevations is calculated according to the altitude data.

所述步骤4中，采用空间插值法将微地形影响订正后的覆冰厚度进行空间插值，并绘制电网冰区分布图，所述空间插值法包括克里格插值法。电网冰区分布图的冰区分类及色标规定如下表1所示：In the step 4, spatial interpolation is performed on the corrected ice thickness due to micro-topography effects, and a distribution map of ice areas of the power grid is drawn using a spatial interpolation method, which includes a Kriging interpolation method. The ice area classification and color code regulations of the grid ice area distribution map are shown in Table 1 below:

表1Table 1

所述步骤5中，对在运行线路覆冰事故点实测覆冰进行质量控制并将实测覆冰厚度转化为标准冰厚，比较所述标准冰厚与所述电网冰区分布图显示的事故点的设计冰厚，结合气候、地形、海拔和水体对所绘电网冰区分布图进行订正。In the step 5, quality control is carried out on the measured icing at the icing accident point of the operating line, and the measured icing thickness is converted into a standard ice thickness, and the standard ice thickness is compared with the accident point shown in the ice area distribution map of the power grid Based on the designed ice thickness, the ice area distribution map drawn by the power grid is corrected in combination with climate, topography, altitude and water body.

对于实测覆冰厚度远大于基于气象资料绘制的电网冰区分布图显示的设计冰厚，在实测覆冰所在位置进行标示，并进行文字说明，为电网冰区分布图的使用者提供参考。If the measured ice thickness is much greater than the design ice thickness shown in the grid ice area distribution map based on meteorological data, the location of the actually measured ice cover is marked, and a text description is given to provide reference for users of the grid ice area distribution map.

最后应当说明的是：以上实施例仅用以说明本发明的技术方案而非对其限制，尽管参照上述实施例对本发明进行了详细的说明，所属领域的普通技术人员应当理解：依然可以对本发明的具体实施方式进行修改或者等同替换，而未脱离本发明精神和范围的任何修改或者等同替换，其均应涵盖在本发明的权利要求范围当中。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims (10)

1. electrical network ice formation distribution plan method for drafting is characterized in that: said method comprising the steps of:

Step 1: collect data;

Step 2: the design ice thickness of calculating the different reoccurrence periods;

Step 3: mima type microrelief is corrected ice covering thickness;

Step 4: draw described electrical network ice formation distribution plan;

Step 5: correct described electrical network ice formation distribution plan.

2. electrical network according to claim 1 ice formation distribution plan method for drafting, it is characterized in that: in the described step 1, data comprise this area Transmission Line Design and operating experience data, this area diurnal meterorological data data in winter over the years and this area digital elevation model and topomap base map data.

3. electrical network according to claim 2 ice formation distribution plan method for drafting, it is characterized in that: described this area Transmission Line Design and operating experience data comprise design ice thickness, checking computations ice thickness, longitude and latitude and the terrain information of the power transmission line corridor of operation 330kV and above, and longitude and latitude, icing type, ice covering thickness and the terrain information at transmission line of electricity actual measurement icing place;

Described this area diurnal meterorological data data in winter over the years comprise that surface weather observation station, this area diurnal meterorological data data in winter over the years and this area have the day by day icing data at the surface weather observation station of Ice data; Surface weather observation station, described this area diurnal meterorological data data in winter over the years comprise daily mean temperature, daily maximum temperature, day lowest temperature, per day relative humidity, per day vapour pressure, daily precipitation amount, sunshine time and per day wind speed, and the day by day icing data that described this area has the surface weather observation station of Ice data comprises that icing ice weighs and the icing line of apsides.

4. electrical network according to claim 1 ice formation distribution plan method for drafting, it is characterized in that: described step 2 may further comprise the steps:

Step 2-1: the icing data at surface weather observation station is converted into the standard ice thickness;

Step 2-2: the standard ice thickness is carried out height and wire diameter is corrected;

Step 2-3: according to icing material computation design ice thickness.

5. electrical network according to claim 4 ice formation distribution plan method for drafting is characterized in that: among the described step 2-1, when north-south ice covering thickness and East and West direction ice covering thickness not simultaneously, get ice covering thickness the greater; Have the heavy icing data of measured ice and choose according to the ice tuple and transform according to carrying out the standard ice thickness, the icing data with actual measurement icing line of apsides is carried out the standard ice thickness according to the icing line of apsides and is transformed.

6. electrical network according to claim 4 ice formation distribution plan method for drafting is characterized in that: among the described step 2-2, be that terrain clearance is that 10 meters, diameter are the icing ice thickness on 26.8 millimeters and not charged, the non-wire that reverses with the standard ice thickness correction.

7. electrical network according to claim 4 ice formation distribution plan method for drafting, it is characterized in that: among the described step 2-3, by adopting the relational model between the polynary progressively linear regression method statistics ice covering thickness meteorological parameter relevant with each, and this model extended to the surface weather observation station, utilize corresponding meteorological parameter record, calculate the corresponding historical icing ice thickness in surface weather observation station, and then, calculate position, the surface weather observation station design ice thickness of different reoccurrence periods according to extreme I type, Gumble distribution or Pearson came III type statistical model.

8. electrical network according to claim 1 ice formation distribution plan method for drafting, it is characterized in that: in the described step 3, distribution situation according to the surface weather observation station with icing Observation Service, the drawing scope further is refined as latticed zone, single grid planted agent after the division comprises at least one surface weather observation station, with the design ice thickness of different reoccurrence periods of calculating according to ground meteorological site data in the grid as standard value, according to the absolute elevation data, calculate the mima type microrelief ice covering thickness in the different elevations.

9. electrical network according to claim 1 ice formation distribution plan method for drafting is characterized in that: in the described step 4, adopt Spatial Interpolation Method that the revised ice covering thickness of Micro-terrain Action is carried out space interpolation, and draw electrical network ice formation distribution plan; Described Spatial Interpolation Method comprises the Krieger method of interpolation.

10. electrical network according to claim 1 ice formation distribution plan method for drafting, it is characterized in that: in the described step 5, to carrying out quality control and will survey ice covering thickness being converted into the standard ice thickness at working line icing accident point actual measurement icing, the design ice thickness of the accident point that more described standard ice thickness and described electrical network ice formation distribution plan show is corrected painting electrical network ice formation distribution plan in conjunction with weather, landform, height above sea level and water body.

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