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中文摘要：
接地网土壤防腐研究对保证电网安全运行具有重要意义。以沧州21个变电站接地网土壤为研究对象，通过现场及实验室测试土壤腐蚀性因素指标，运用主成分分析方法进行了统计分析。主成分分析研究结果表明，沧州接地网土壤中关键腐蚀性因素为氯化物、全盐含量和电阻率。根据土壤中的盐分与氯离子含量指标，接地网土壤主要分为滨海中度．重度盐化土壤、轻盐化潮土和潮土三种类型。以关键腐蚀性因素和土壤类型为评价指标，沧州地区接地网土壤腐蚀性划分为强腐蚀性、较强腐蚀性和中等腐蚀三个等级。近海的港城等4个变电站处于强腐蚀性土壤中，李刘堡等9个变电站土壤的腐蚀性较强，韩村等8个变电站的土壤属于中等腐蚀。
英文摘要：
The study on protection of grounding grids from corrosion in soil is of great significance to safe operation of power networks. Soil samples were collected from the grounding grid sites of 21 transformer substations in Cangzhou region as research objects. Corrosive factors in the soil samples were determined and measured on the spots and in the lab, and the data were analyzed using the principal component analysis method for statistics. Results show that chloride, total salinity and electrical resisti vity were the key corrosive factors in grounding-grid soils. Based on the indexes of chloride content and total salinity in the soil, the soil samples were sorted into three groups： coastal moderate/severely salinized soil, slightly salinized fluvo-aquic soil and fluvo-aquic soil. When key corrosive factors and soil types were cited as evaluation indexes, corrosiveness of the soil samples was divided into three grades, that is, very strong, strong and moderate. The Gangcheng Transformer Station and 3 others in the coastal region stand in soils, very strong in corrosiveness, the Liliubao station and 9 others in soils, strong in corrosiveness, and the Hancun station and 8 others in soils, moderate in corrosiveness.
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