城区变电站地电位模拟测试研究

在城市电力建设中,研究故障入地电流产生的地电位分布特点,防止地电位升高对电信设施和计算机系统产生的危险影响十分重要.由于城区存在大量地下金属管线和建筑物,建立有效的地电位计算模型相当困难.文章采用大电流变频法对城区变电站的地电位分布进行了模拟测试;分析了地下金属管线、建筑物的钢筋混凝土地基、变电站附近的其它接地网以及与变电站相连的电缆金属护套对地电位分布的影响;还指出了在城市电力建设中为减小地电位应注意的问题.

STUDY ON SIMULATION TEST AND MEASUREMENT OF GROUND POTENTIAL OF SUBSTATION IN CITY PROPER

In civic power construction it is very important to research the feature of ground potential distribution while fault current occurs to prevent the dangerous affect of the rising of ground potential on communication facilities and computer systems. Because there are lots of underground metal pipelines and buildings, therefore, it is rather difficult to establish an effective model to calculate the ground potential distribution. Here, using such a simulation method as large current with various frequencies, the ground potential distribution of civic substation in the city proper is tested and measured, and the influences of underground metal pipelines, the reinforced concrete beds of the buildings, the other grounding meshes near the substation and the metal sheathes of the cables connected with the grounding mesh of the substation on the distribution of grounding potential are analyzed. To reduce the grounding potential, some problems which should be paid attention to in the civic power construction are pointed out.