因子分析法在变电站土壤腐蚀性评价中的应用

对某区123个110 kV变电站的接地网中部土壤进行取样分析，详细测定了土壤的理化性能 (共11个指标)，应用因子分析法对测定数据进行分析、处理。结果表明，该区变电站接地网土壤腐蚀性主要影响因素为：Ca²⁺+Mg²⁺，SO₄^2-，pH值，Cl^-和含水率。以此5项关键腐蚀性因素作为评价指标进行综合评价，该区变电站接地网土壤腐蚀性分为特强 (11个变电站)、强 (86个变电站)、较强 (14个变电站) 和中等 (12个变电站) 4个等级。同时，采用德国Beckman标准评价方法对123个变电站接地网土壤腐蚀性进行了评价，两者结果基本一致，说明因子分析法可应用到变电站接地网土壤腐蚀性评价中，且可靠性较高。

Evaluation of Soil Corrosivity for Ground Grid of Substations in an Area by Factor Analysis

Soils in a depth corresponding to half length of the buried grouding grids are sampled from sites of 123 substations of a 110 kV transmission network in an area. Their physical and chemical properties (11 indexes) are measured, which then are analyzed and processed by using the method of factor analysis. The results show that soil corrosivity for substation ground grid in this area is mainly influenced by calcium and magnesium ions, pH value, chloride ion and water content. A comprehensive evaluation is made based on these five key corrosive factors. It follows that the soil corrosivity for substation ground grids in this area may be divided into four levels as: exceptionally strong (11 substations), strong (86 substations), relatively strong (14 substations) and middle (12 substations). Meanwhile, the corrosivity of all the soil samples are evaluated according to German Beckman standard method. The results of the two methods are in accord with each other, which indicates that factor analysis can be applied to evaluate the soil corrosivity for substation ground grid with a good reliablility.