CN106153097B - Icing degree characterization method for icing insulator string - Google Patents
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Abstract
本发明涉及覆冰绝缘子串覆冰程度表征方法，根据所述覆冰密度换算所述绝缘子覆冰桥接度相对变化率，然后结合运行环境对所述绝缘子覆冰桥接度相对变化率进行校正，最后根据校正后的绝缘子覆冰桥接度相对变化率以及所述导线的覆冰厚度确定所述绝缘子覆冰桥接度。本发明通过测量所述导线的覆冰厚度和覆冰密度从而换算出所述绝缘子的覆冰桥接度，克服了实际线路监测时不能直接监测所述绝缘子覆冰桥接程度的问题，有效表征了绝缘子覆冰程度。
The invention relates to a method for characterizing the ice-covered degree of ice-covered insulator strings. The ice-covered bridging degree of the insulator is determined according to the corrected relative change rate of the ice-covered bridging degree of the insulator and the ice-covered thickness of the wire. The invention converts the ice-covered bridging degree of the insulator by measuring the ice-covered thickness and ice-covered density of the wire, overcomes the problem that the ice-covered bridge degree of the insulator cannot be directly monitored during actual line monitoring, and effectively characterizes the insulator. Degree of icing.
Description
技术领域technical field
本发明涉及电力应用领域，尤其是指覆冰绝缘子串覆冰程度表征方法。The invention relates to the field of electric power application, in particular to a method for characterizing the degree of ice coating of ice-coated insulator strings.
背景技术Background technique
根据国家电网公司发展特高压骨干网架的总体思路，通过建设更高电压等级的国家电网，促进跨大区跨流域的水火互济和更大范围的资源优化配置，满足国民经济发展的需要。超特高压交直流输电线路具有线路路径长，穿越地区环境条件复杂的特点，将不可避免地经过峡谷、河流、微气象等各种复杂的地理环境，以及雨凇和大雪等恶劣的气象条件区域，而且输电线路在面临大气和工业环境污染的同时，还要面对一定的高海拔问题。输电线路覆冰及大雪现象是输电线路外绝缘设计必须要考虑的问题之一，国内外长期运行及设计经验也表明，重覆冰/雪区的外绝缘可靠性已经成为高压输电线路外绝缘设计的关键因素，需要在设计时考虑绝缘子的耐冰闪/雪闪能力。According to the general idea of the State Grid Corporation of China to develop the UHV backbone grid, through the construction of a higher voltage level of the State Grid, it will promote the inter-regional and cross-basin water and fire mutual aid and a wider range of resource optimization to meet the needs of national economic development. Ultra-UHV AC and DC transmission lines have the characteristics of long line paths and complex environmental conditions across regions. They will inevitably pass through various complex geographical environments such as canyons, rivers, and micro-meteorology, as well as areas with severe weather conditions such as rain and heavy snow. , and the transmission line faces certain high altitude problems while facing atmospheric and industrial environmental pollution. The phenomenon of icing and heavy snow on transmission lines is one of the issues that must be considered in the design of external insulation of transmission lines. The long-term operation and design experience at home and abroad also shows that the reliability of external insulation in repeated ice/snow areas has become the external insulation design of high-voltage transmission lines. The key factor is that the ice flashover/snow flashover resistance of the insulator needs to be considered in the design.
我国的冰区一般按照导线上的覆冰厚度作为依据来划分，冰厚达到20mm以上为重冰区，10-20mm为中冰区，不足10mm为轻冰区。根据我国超特高压输电线路设计惯例，在小于10mm覆冰条件下，绝缘配置是按照污秽外绝缘耐受水平来考虑的。但现场调研结果显示，一些地区已经发生了导线5-10mm轻覆冰条件下的绝缘子覆冰闪络事故，如某些杆塔覆冰闪络故障发生后，发现故障地区导线覆冰厚度测量值仅为5mm左右，而绝缘子串却形成了较严重的桥接。可见仅按照污秽外绝缘耐受水平进行外绝缘设计存在配置不足的可能，而对导线覆冰厚度和绝缘子串覆冰桥接情况的观测也说明导线覆冰厚度与绝缘子上的覆冰并不能直接等价，在导线轻覆冰厚度的条件下也有可能造成绝缘子串被覆冰严重桥接。但在实际线路监测时，由于无法直接监测所述绝缘子覆冰桥接程度，目前均是通过检测所述导线的覆冰厚度来判断所述绝缘子是否发生闪络事故，导致仍旧存在发生覆冰闪络事故的风险。The ice area in my country is generally divided according to the thickness of the ice coating on the wire. The ice thickness is more than 20mm as the heavy ice area, 10-20mm as the medium ice area, and less than 10mm as the light ice area. According to the design practice of ultra-high voltage transmission lines in my country, under the condition of less than 10mm icing, the insulation configuration is considered according to the pollution resistance level of external insulation. However, the results of on-site investigation show that insulator icing flashover accidents under the condition of light icing of 5-10mm conductors have occurred in some areas. It is about 5mm, but the insulator string has formed a serious bridge. It can be seen that there is a possibility of insufficient configuration in the design of external insulation only based on the level of pollution external insulation resistance, and the observation of the thickness of the ice coating on the wire and the bridging situation of the ice coating on the insulator string also shows that the thickness of the wire ice coating and the ice coating on the insulator are not directly equivalent. Under the condition of light ice coating thickness of conductor, it may also cause serious bridging of insulator strings covered by ice. However, in actual line monitoring, since it is impossible to directly monitor the degree of ice-covered bridging of the insulator, at present, it is determined whether the insulator has a flashover accident by detecting the ice-covered thickness of the wire, resulting in the occurrence of ice-covered flashover. risk of accident.
发明内容SUMMARY OF THE INVENTION
为此，本发明所要解决的技术问题在于克服现有技术中绝缘子发生覆冰闪络事故的问题从而提供一种可以有效避免覆冰闪络事故的覆冰绝缘子串覆冰程度表征方法。Therefore, the technical problem to be solved by the present invention is to overcome the problem of the ice-covered flashover accident of the insulator in the prior art, so as to provide a method for characterizing the ice-covered degree of the ice-covered insulator string which can effectively avoid the ice-covered flashover accident.
为解决上述技术问题，本发明的一种覆冰绝缘子串覆冰程度表征方法，其中所述绝缘子与导线相连，其步骤如下：步骤S1：测量所述导线的覆冰厚度与覆冰密度；步骤S2：根据所述覆冰密度换算所述绝缘子覆冰桥接度相对变化率；步骤S3：结合运行环境中所述绝缘子的类型、污秽度以及运行电压，对所述绝缘子覆冰桥接度的相对变化率进行校正；步骤S4：根据校正后的绝缘子覆冰桥接度相对变化率以及所述导线的覆冰厚度确定所述绝缘子覆冰桥接度。In order to solve the above-mentioned technical problems, a method for characterizing the degree of ice coating of an ice-coated insulator string of the present invention, wherein the insulator is connected to a wire, and the steps are as follows: Step S1: measure the ice-coated thickness and ice-coated density of the wire; step S2: convert the relative change rate of the insulator bridging degree of ice coating according to the ice coating density; step S3: combine the type, pollution degree and operating voltage of the insulator in the operating environment, and calculate the relative change of the bridging degree of ice coating of the insulator Step S4: Determine the ice-covered bridge degree of the insulator according to the corrected relative change rate of the ice-covered bridge degree of the insulator and the ice-covered thickness of the wire.
在本发明的一个实施例中，所述步骤S2是将所述导线和绝缘子在相同环境下进行覆冰实验。In an embodiment of the present invention, the step S2 is to perform an ice coating experiment on the wire and the insulator in the same environment.
在本发明的一个实施例中，进行覆冰实验时，将所述导线和绝缘子置放在人工气候室中，通过调整环境温度和喷水量模拟不同环境下所述绝缘子覆冰桥接度与导线覆冰厚度的关系。In an embodiment of the present invention, during the ice coating experiment, the wires and insulators are placed in an artificial climate chamber, and the bridging degree of ice coating of the insulators and the wires in different environments is simulated by adjusting the ambient temperature and the amount of water spray. relationship to ice thickness.
在本发明的一个实施例中，进行覆冰实验时，比较带电条件下绝缘子覆冰桥接度相对变化率与不带电条件下绝缘子覆冰桥接度相对变化率的关系。In an embodiment of the present invention, when performing an ice coating experiment, the relationship between the relative change rate of the bridging degree of insulator ice coating under charged conditions and the relative rate of change of the insulator ice coating bridging degree under uncharged conditions is compared.
在本发明的一个实施例中，进行覆冰实验时，带电条件下覆冰初期的绝缘子覆冰桥接度相对变化率与不带电条件下绝缘子覆冰桥接度相对变化率相近。In an embodiment of the present invention, during the ice coating experiment, the relative change rate of the insulator ice-covered bridging degree at the initial stage of ice-covering under the charged condition is similar to the relative change rate of the insulator's ice-covered bridge degree under the uncharged condition.
在本发明的一个实施例中，进行覆冰实验时，带电条件下覆冰中期的绝缘子覆冰桥接度相对变化率与不带电条件下绝缘子覆冰桥接度相对变化率有差距，根据绝缘子表面污秽度、覆冰水电导率、电压等级各个因素对所述绝缘子覆冰桥接度相对变化率进行校正。In one embodiment of the present invention, when an ice coating experiment is performed, there is a difference between the relative change rate of the bridging degree of insulator ice coating in the middle stage of icing under live conditions and the relative change rate of the bridging degree of insulator ice coating under uncharged conditions. According to the contamination on the surface of the insulator The relative change rate of the insulator ice-coated bridging degree is corrected by various factors such as degree, conductivity of ice-coated water, and voltage level.
在本发明的一个实施例中，对所述绝缘子覆冰桥接度相对变化率进行校正时利用修正系数可以准确得出带电条件下绝缘子覆冰桥接度相对变化率。In an embodiment of the present invention, when correcting the relative change rate of the insulator ice-covered bridging degree, a correction coefficient can be used to accurately obtain the relative change rate of the insulator's ice-covered bridge degree under live conditions.
在本发明的一个实施例中，所述修正系数为与盐密、灰密、电压以及覆冰水电导率多个因素相关的函数。In one embodiment of the present invention, the correction factor is a function related to a number of factors including salt density, ash density, voltage, and conductivity of ice-coated water.
在本发明的一个实施例中，所述步骤S2中，所述绝缘子覆冰桥接度相对变化率与所述覆冰密度呈幂函数关系。In an embodiment of the present invention, in the step S2, the relative change rate of the ice-covered bridging degree of the insulator is in a power function relationship with the ice-covered density.
在本发明的一个实施例中，所述步骤S4中，所述绝缘子覆冰桥接度由校正后的绝缘子覆冰桥接度相对变化率与所述导线覆冰厚度的乘积决定。In an embodiment of the present invention, in the step S4, the bridging degree of the insulator ice coating is determined by the product of the corrected relative change rate of the ice coating bridging degree of the insulator and the ice coating thickness of the wire.
本发明的上述技术方案相比现有技术具有以下优点：The above-mentioned technical scheme of the present invention has the following advantages compared with the prior art:
本发明所述覆冰绝缘子串覆冰程度表征方法，利用绝缘子覆冰桥接度相对变化率来表征绝缘子桥接程度与导线覆冰厚度的关系，且绝缘子覆冰桥接度相对变化率是关于覆冰密度的幂函数，本发明通过测量所述导线的覆冰厚度和覆冰密度从而换算出所述绝缘子的覆冰桥接度，克服了实际线路监测时不能直接监测所述绝缘子覆冰桥接程度的问题，有效避免了覆冰闪络事故的发生。The method for characterizing the ice-covered degree of the ice-covered insulator string of the present invention utilizes the relative change rate of the ice-covered bridging degree of the insulator to characterize the relationship between the insulator bridging degree and the ice-covered thickness of the wire, and the relative change rate of the insulator's ice-covered bridging degree is related to the ice-covered density. The present invention converts the ice-covered bridging degree of the insulator by measuring the ice-covered thickness and ice-covered density of the wire, and overcomes the problem that the ice-covered bridge degree of the insulator cannot be directly monitored during actual line monitoring. This effectively avoids the occurrence of icing flashover accidents.
附图说明Description of drawings
为了使本发明的内容更容易被清楚的理解，下面根据本发明的具体实施例并结合附图，对本发明作进一步详细的说明，其中In order to make the content of the present invention easier to understand clearly, the present invention will be described in further detail below according to specific embodiments of the present invention and in conjunction with the accompanying drawings, wherein
图1是本发明所述覆冰绝缘子串覆冰程度表征方法的流程图；Fig. 1 is the flow chart of the method for characterizing the ice coating degree of the ice-coated insulator string according to the present invention;
图2是本发明所述覆冰实验的示意图。Fig. 2 is a schematic diagram of the ice coating experiment of the present invention.
具体实施方式Detailed ways
请参考图1所示，本实施例提供一种覆冰绝缘子串覆冰程度表征方法，其中所述绝缘子与导线相连，其步骤如下：步骤S1：测量所述导线的覆冰厚度与覆冰密度；步骤S2：根据所述覆冰密度换算所述绝缘子覆冰桥接度相对变化率；步骤S3：结合运行环境中所述绝缘子的类型、污秽度以及运行电压，对所述绝缘子覆冰桥接度的相对变化率进行校正；步骤S4：根据校正后的绝缘子覆冰桥接度相对变化率以及所述导线的覆冰厚度确定所述绝缘子覆冰桥接度。Please refer to FIG. 1 , this embodiment provides a method for characterizing the degree of ice coating of an ice-coated insulator string, wherein the insulator is connected to a wire, and the steps are as follows: Step S1 : Measure the ice-coated thickness and ice-coated density of the wire ; Step S2: convert the relative rate of change of the bridging degree of ice coating of the insulator according to the density of the coating of ice; The relative change rate is corrected; Step S4: Determine the ice-covered bridge degree of the insulator according to the corrected relative change rate of the ice-covered bridge degree of the insulator and the ice-covered thickness of the wire.
上述是本发明所述的核心技术领域，本发明所述覆冰绝缘子串覆冰程度表征方法，其中所述绝缘子与导线相连，所述步骤S1中，测量所述导线的覆冰厚度与覆冰密度；所述步骤S2中，根据所述覆冰密度换算所述绝缘子覆冰桥接度相对变化率，由于同一覆冰环境下所述覆冰密度是一定的，因此根据不同条件下的覆冰密度与所述绝缘子覆冰桥接度相对变化率的关系就可以建立两者间的函数关系；所述步骤S3中，结合运行环境中所述绝缘子的类型、污秽度以及运行电压，对所述绝缘子覆冰桥接度的相对变化率进行校正，从而有利于模拟实际运行环境中覆冰绝缘子串的覆冰程度；所述步骤S4中，根据校正后的绝缘子覆冰桥接度相对变化率以及所述导线的覆冰厚度可对同一覆冰环境内的绝缘子覆冰桥接程度进行换算，从而确定所述绝缘子覆冰桥接度，本发明通过测量所述导线的覆冰厚度和覆冰密度从而换算出所述绝缘子的覆冰桥接度，克服了实际线路监测时不能直接监测所述绝缘子覆冰桥接程度的问题，有效地表征了绝缘子覆冰严重程度，规避了覆冰闪络事故发生的风险。The above is the core technical field of the present invention. The method for characterizing the degree of ice coating of an ice-coated insulator string according to the present invention, wherein the insulator is connected to a wire, in the step S1, the ice-coated thickness of the wire and the ice-coated thickness of the wire are measured. In the step S2, the relative change rate of the insulator ice-covered bridge degree is converted according to the ice-covered density. Since the ice-covered density is constant under the same ice-covered environment, the ice-covered density under different conditions A functional relationship between the two can be established by the relationship with the relative rate of change of the bridging degree of ice coating of the insulator; in the step S3, combining the type, pollution degree and operating voltage of the insulator in the operating environment, the insulator is covered. The relative change rate of the ice bridging degree is corrected, so as to facilitate the simulation of the ice covering degree of the ice-covered insulator string in the actual operating environment; in the step S4, according to the corrected relative change rate of the ice-covering bridging degree of the insulator and the The ice-covered thickness can convert the ice-covered bridging degree of the insulator in the same ice-covered environment to determine the ice-covered bridging degree of the insulator. The present invention converts the insulator by measuring the ice-covered thickness and ice-covered density of the wire. The ice-covered bridging degree can overcome the problem that the actual line monitoring cannot directly monitor the ice-covered bridging degree of the insulator, effectively characterize the ice-covered severity of the insulator, and avoid the risk of ice-covered flashover accidents.
本实施中，所述步骤S2是将所述导线和绝缘子在相同环境下进行覆冰实验。具体的，如图2所示，所述导线11和绝缘子12置放在人工气候室13中，其中所述导线11与所述绝缘子12并联，所述人工气候室13的下端设有套管14，所述套管14内通过导体与所述导线11相连，所述人工气候室13内还设有喷头15，通过所述喷头15可以为室内降水降温，通过调整室内环境温度和喷水量模拟不同环境下所述绝缘子覆冰桥接度与导线覆冰厚度的关系。In this implementation, the step S2 is to perform an ice coating experiment on the wire and the insulator in the same environment. Specifically, as shown in FIG. 2 , the
本实施中，由于同一条件下所述覆冰密度ρ是一定的，为此根据不同条件下覆冰密度ρ与所述绝缘子覆冰桥接度相对变化率K的关系可以建立两者间的函数关系。具体通过实验可得到，所述绝缘子覆冰桥接度相对变化率K与所述覆冰密度ρ呈幂函数关系，用公式表示为K=Cρn；其中C和n是为与绝缘子类型以及环境因素相关的常数。In this implementation, since the ice-covered density ρ is constant under the same conditions, a functional relationship between the two can be established according to the relationship between the ice-covered density ρ and the relative change rate K of the ice-covered bridge degree of the insulator under different conditions . Specifically, it can be obtained through experiments that the relative change rate K of the insulator ice-covered bridging degree is in a power function relationship with the ice-covered density ρ, which is expressed as K=Cρ n with the formula; wherein C and n are related to the type of insulator and environmental factors. related constants.
上述进行的是不带电的覆冰实验，为验证该规律在带电条件下的有效性，还需进行带电覆冰试验，并将试验结果与相同条件下进行的不带电覆冰试验结果对比。具体地，进行覆冰实验时，比较带电条件下绝缘子覆冰桥接度相对变化率与不带电条件下绝缘子覆冰桥接度相对变化率的关系。其中，所述绝缘子覆冰桥接度相对变化率在带电条件下分为覆冰初期，覆冰中期，覆冰稳定时期三个阶段。覆冰初期所述导线和所述绝缘子开始生长冰凌，实验表明：所述绝缘子覆冰桥接度相对变化率与不带电条件下绝缘子覆冰桥接度相对变化率相近。覆冰中期，由于冰棱生长导致的电场畸变使得在高场强区域发生放电，这些区域冰棱生长放缓，实验表明：该阶段所述绝缘子覆冰桥接度相对变化率与不带电覆冰条件下绝缘子覆冰桥接度相对变化率有差距，此时的相对变化率需根据绝缘子表面污秽度、覆冰水电导率、电压等级等因素进行校正。具体地，根据绝缘子表面污秽度、覆冰水电导率、电压等级各个因素对所述绝缘子覆冰桥接度相对变化率进行校正，通常利用修正系数可以准确得出带电条件下绝缘子覆冰桥接度相对变化率，用公式表示为：K=CρnM，其中所述修正系数M为与盐密（ESDD）、灰密（NSDD）、电压U以及覆冰水电导率σ等多个因素相关的函数，用公式表示为：M=f（U，σ,NSDD，ESDD…）。对于覆冰稳定时期，由于所述导线和所述绝缘子的冰凌不再变化，实验表明：所述绝缘子覆冰桥接度已达饱和程度，绝缘子覆冰桥接程度不再随所述导线覆冰厚度的增加而增加。The above is an uncharged icing experiment. In order to verify the validity of this rule under electrified conditions, an electrified icing test is also required, and the test results are compared with the uncharged icing test results under the same conditions. Specifically, during the ice coating experiment, the relationship between the relative change rate of the bridging degree of insulator ice coating under the charged condition and the relative rate of change of the insulator ice coating bridging degree under the uncharged condition was compared. Wherein, the relative rate of change of the insulator bridging degree with ice coating is divided into three stages: the initial stage of icing, the middle stage of icing, and the stable stage of icing under the charged condition. In the early stage of icing, the wire and the insulator begin to grow ice, and the experiment shows that the relative change rate of the bridging degree of the insulator with ice coating is similar to the relative change rate of the bridging degree of the insulator under the condition of no charge. In the middle stage of icing, the electric field distortion caused by the growth of ice ridges makes discharge occur in high field strength regions, and the growth of ice ridges in these regions is slowed down. The relative change rate of the ice-coated bridge degree of the lower insulator is different, and the relative change rate at this time needs to be corrected according to factors such as the surface contamination of the insulator, the conductivity of the ice-coated water, and the voltage level. Specifically, the relative change rate of the insulator's ice-coated bridge degree is corrected according to various factors such as the contamination degree of the insulator surface, the conductivity of the ice-coated water, and the voltage level. Usually, the correction coefficient can be used to accurately obtain the relative change of the insulator's ice-coated bridge degree under live conditions. The rate of change, expressed by the formula: K=Cρ n M, wherein the correction coefficient M is a function related to several factors such as salt density (ESDD), ash density (NSDD), voltage U, and conductivity σ of ice-coated water , expressed as: M=f (U, σ, NSDD, ESDD…). For the ice-covered stable period, since the ice of the wire and the insulator no longer changes, the experiment shows that the ice-covered bridging degree of the insulator has reached the saturation level, and the ice-covered bridging degree of the insulator no longer varies with the ice-covered thickness of the wire. increase and increase.
为了验证对不同温度下所述绝缘子覆冰桥接度S与所述导线覆冰厚度D的关系，在不带电条件下进行覆冰实验，经过实验得出：所述绝缘子覆冰桥接度S与所述导线覆冰厚度D呈线性增长关系，且随着温度的下降，所述导线覆冰厚度D也随之下降，从而对应的所述绝缘子覆冰桥接度S越低。同时由实验得出：随着温度的下降，所述导线和所述绝缘子的表面覆冰密度下降。为对所述绝缘子覆冰桥接度S与导线覆冰厚度D关系进行定量表征，若所述绝缘子覆冰桥接度相对变化率为K，则用公式表达为：K=△S/△D。In order to verify the relationship between the ice-covered bridging degree S of the insulator and the ice-covered thickness D of the wire at different temperatures, an ice-covered experiment was carried out under uncharged conditions. The ice-covered thickness D of the wire has a linear growth relationship, and as the temperature decreases, the ice-covered thickness D of the wire also decreases, so the corresponding ice-covered bridging degree S of the insulator is lower. At the same time, it is obtained from the experiment that with the decrease of temperature, the density of ice coating on the surface of the wire and the insulator decreases. In order to quantitatively characterize the relationship between the ice-covered bridging degree S of the insulator and the wire-covered ice-covered thickness D, if the relative change rate of the ice-covered bridging degree of the insulator is K, the formula is expressed as: K=ΔS/ΔD.
为了模拟现场运行环境，需要结合运行环境中所述绝缘子的类型、污秽度以及运行电压等因素，对所述绝缘子覆冰桥接度的相对变化率进行校正，从而更有利于使覆冰绝缘子串的覆冰程度更接近实际运行环境。所述步骤S4中，对于校正后的绝缘子覆冰桥接度S由所述绝缘子覆冰桥接度相对变化率K与所述导线覆冰厚度D的乘积决定。In order to simulate the on-site operating environment, it is necessary to correct the relative change rate of the ice-coated bridge degree of the insulators based on factors such as the type of the insulators, the degree of pollution and the operating voltage in the operating environment, so as to be more conducive to making the ice-coated insulator strings more stable. The degree of icing is closer to the actual operating environment. In the step S4, the corrected ice-covered bridging degree S of the insulator is determined by the product of the relative change rate K of the insulator's ice-covered bridging degree and the ice-covered thickness D of the wire.
综上，本发明所述技术方案具有以下优点：To sum up, the technical solution of the present invention has the following advantages:
1.本发明所述覆冰绝缘子串覆冰程度表征方法，其中所述绝缘子与导线相连，所述步骤S1中，测量所述导线的覆冰厚度与覆冰密度；所述步骤S2中，根据所述覆冰密度换算所述绝缘子覆冰桥接度相对变化率，由于同一覆冰环境下所述覆冰密度是一定的，因此根据不同条件下的覆冰密度与所述绝缘子覆冰桥接度相对变化率的关系就可以建立两者间的函数关系；所述步骤S3中，结合运行环境中所述绝缘子的类型、污秽度以及运行电压，对所述绝缘子覆冰桥接度的相对变化率进行校正，有利于模拟实际运行环境中覆冰绝缘子串的覆冰程度；所述步骤S4中，根据校正后的绝缘子覆冰桥接度相对变化率以及所述导线的覆冰厚度可对同一覆冰环境内的绝缘子覆冰桥接程度进行换算，从而确定所述绝缘子覆冰桥接度，本发明通过测量所述导线的覆冰厚度和覆冰密度从而换算出所述绝缘子的覆冰桥接度，克服了实际线路监测时不能直接监测所述绝缘子覆冰桥接程度的问题，有效地表征了绝缘子覆冰严重程度。1. The method for characterizing the degree of ice coating of an ice-coated insulator string according to the present invention, wherein the insulator is connected to a wire, and in the step S1, the ice-coated thickness and the ice-coated density of the wire are measured; in the step S2, according to The ice-covered density is converted into the relative change rate of the insulator’s ice-covered bridging degree. Since the ice-covered density is constant under the same ice-covered environment, the ice-covered density under different conditions is relative to the insulator’s ice-covered bridging degree. The functional relationship between the two can be established based on the relationship of the rate of change; in the step S3, the relative rate of change of the ice-covered bridge degree of the insulator is corrected according to the type, pollution degree and operating voltage of the insulator in the operating environment , which is conducive to simulating the ice-covering degree of the ice-covered insulator string in the actual operating environment; in the step S4, according to the corrected relative change rate of the ice-covered bridge degree of the insulator and the ice-covered thickness of the wire, the same ice-covered environment can be used. The ice-covered bridging degree of the insulator is converted to determine the ice-covered bridging degree of the insulator. In the present invention, the ice-covered bridging degree of the insulator is converted by measuring the ice-covered thickness and ice-covered density of the wire, which overcomes the problem of the actual circuit. The problem that the degree of ice-covering and bridging of the insulator cannot be directly monitored during monitoring effectively represents the severity of ice-covering of the insulator.
2.本发明所述覆冰绝缘子串覆冰程度表征方法，所述步骤S2是将所述导线和绝缘子在相同环境下进行覆冰实验，通过调整人工气候室内环境温度和喷水量模拟不同环境下所述绝缘子覆冰桥接度与导线覆冰厚度的关系。2. The method for characterizing the degree of ice coating of the ice-coated insulator strings of the present invention, the step S2 is to carry out the ice-coating experiment on the wire and the insulator in the same environment, and simulate different environments by adjusting the indoor environmental temperature and water spray volume of the artificial climate The relationship between the bridging degree of insulator ice coating and the thickness of conductor ice coating is described below.
显然，上述实施例仅仅是为清楚地说明所作的举例，并非对实施方式的限定。对于所属领域的普通技术人员来说，在上述说明的基础上还可以做出其它不同形式变化或变动。这里无需也无法对所有的实施方式予以穷举。而由此所引伸出的显而易见的变化或变动仍处于本发明创造的保护范围之中。Obviously, the above-mentioned embodiments are only examples for clear description, and are not intended to limit the implementation manner. For those of ordinary skill in the art, other different forms of changes or modifications can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. And the obvious changes or changes derived from this are still within the protection scope of the present invention.
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