变电站安全接地设计.doc

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变电站安全接地设计

毕业设计说明书中文摘要 变电站接地安全设计 电力系统的接地问题是一个看似简单、而实际上却非常复杂至关重要的问题,它直接关系到人身和设备的安全。特别是随着电力系统的发展,电网规模不断扩大,接地短路电流越来越大。各种微机监控设备的普遍应用,对接地的要求越来越高。接地装置不仅仅对工频接地电阻,而且对冲击接地电阻、热稳定、设备接触电压、跨步电压、地电位干扰也有一系列的要求。以前由于接地装置的问题而引起的主设备损坏、变电所发电厂停运等事故已发生多起,都给电网的安全稳定运行带来了很大的危害,因而电力系统的接地问题必须受到充分的重视。 电力系统的安全运行有两方面要求,一是要确保人身和设备的安全,二是要维护电力系统的可靠运行,这都与接地装置的设计密切相关。以往的电力规程中,在接触电势、跨步电压满足的前提下,发电厂、变电所的接地电阻小于0.5 Ω即可。而在新的电力规程《交流电气装置的接地》(DL/T621-1997)中,对接地电阻提出了更高的要求;另一方面,随着电力系统规模的不断扩大,短路电流随之增加,也加大了接地设计的难度。 关键词: 接地电阻;输电线路;变电站;防雷与接地;电力系统 Safe design of grounding ABSTRACT Power system grounding problem is a seemingly simple, but in fact very complex and crucial issue, it is directly related to the safety of persons and equipment. Especially with the development of power systems, power grids have been expanding, more and more ground short circuit current. A variety of widely used computer surveillance equipment on the ground become increasingly demanding. Earthing ground resistance not only on the frequency, but also the impact of ground resistance, thermal stability, equipment, touch voltage, step voltage, ground potential interference with a whole series of requirements. Because the issue before grounding the main equipment damage caused, substation power plant outages and other incidents have occurred more than, gave security and stability of the grid led to great harm, and thus the power system grounding problems must be sufficient attention. The safe operation of power system there are two requirements, it is necessary to ensure the safety of persons and equipment, and second, to maintain reliable operation of power systems, which are designed with the closely related ground equipment. Power rules in the past, the contact 毕业设计说明书外文摘要 potential, step voltage to meet the prerequisite, power plants, substation grounding resistance can be less than 0.5 Ω. In the new electricity regulations, AC Electric Device ground (DL/T621-1997), the resistance on the ground put forward higher requirements; on the othe

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