基于场路耦合低值绝缘子串温度分布研究

Research on Temperature Distribution of Deteriorated Insulator String Based on the Combination of Electrical Field and Road

低值绝缘子对电网系统正常运行潜在一定的隐患。为此提出了一种新的计算低值绝缘子串温度分布的计算方法,该方法利用Maxwell电容矩阵计算绝缘子杂散电容,结合绝缘子串等效电路模型计算低值绝缘子串温度场分布。相比传统有限元仿真,该方法考虑更加全面,更加简便。通过该方法对某110 kV电压等级的低值绝缘子串进行了仿真计算,该方法与有限元、实测一致,且比传统电路法更加精确。利用此方法计算了110 kV线路中低值绝缘子在不同阻值、不同位置、风速和测量误差对含低值绝缘子串温度分布检测的影响,研究表明:低值绝缘子阻值、所处的位置以及风速和测量误差对低值绝缘子串温度分布影响很大,容易造成误检。

Low-value insulators have potential hidden dangers to the normal operation of the grid system.To this end,a new calculation method for calculating the temperature distribution of low-value insulator strings is proposed.This method uses the Maxwell capacitance matrix to calculate the stray capacitance of insulators,and combines the equivalent circuit model of the insulator strings to calculate the temperature field distribution of low-value insulator strings.Compared with traditional finite element simulation,this method is more comprehensive and simpler.This method is used to simulate and calculate a low-value insulator string with a voltage of 110 kV.The method is consistent with the finite element and actual measurement,and is more accurate than the traditional circuit method.This method is used to calculate the influence of low-value insulators at different resistance values,different positions,wind speeds and measurement errors on the temperature distribution detection of low-value insulator strings.The research shows:low-value insulator resistance,location and wind speed And the measurement error has a great influence on the temperature distribution of the low-value insulator string,which is easy to cause false detection.