简要概括电力系统的接地装置分类.doc

 HYPERLINK   HYPERLINK   HYPERLINK   HYPERLINK  简要概括电力系统的接地装置分类 　1 接地的种类和目的 1 grounding type and purpose 　　（一）安全保护接地。主要包括：为防止电力设施或电子电气设备绝缘损坏、危及人身安全而设置的保护接地；为消除生产过程中产生的静电积累，引起触电或爆炸而设的静电接地；为防止电磁感应而对设备的金属外壳、屏蔽罩或屏蔽线外皮所进行的屏蔽接地。其中保护接地应用最为广泛，它将机(外)壳接地。此种接地的目的是为了安全。 (a) safety grounding. Mainly includes: to prevent electric power facilities or electronic electrical equipment insulation damage or endanger the personal safety of protection grounding; To eliminate static electricity generated by the production process accumulation, cause an electric shock or blast and static electricity grounding; For devices to prevent electromagnetic induction metal shell, shield or shield line of skin shielding grounding. Protection grounding is most widely used, it will be machine (outside) shell grounding. This is the purpose of the grounding for safety. 　　（二）系统接地。这种接地给电路系统提供一个基准电位（参考电位），同时也可将干扰引走。此种接地目的是为了抵制外部的干扰。 (2) the system earthing. This grounding circuit system to provide a reference potential (reference potential), and at the same time interference can be led away. This kind of grounding in order to resist the external interference. 　　（三）防雷接地。为防止雷电过电压对人身或设备产生危害，而设置的过电压保护设备的接地，称为防雷接地，如避雷针、避雷器的接地。 (3) lightning protection grounding. To prevent lightning overvoltage causes serious damage to person or equipment, and set the grounding overvoltage protection device, called the lightning protection grounding, such as the lightning rod, lightning arrester grounding. 　　（四）重复接地。在低压配电系统的系统中，为防止因中性线故障而失去接地保护作用，造成电击危险和损坏设备，对中性线进行重复接地。系统中的重复接地点为：架空线路的终端及线路中适当点；四芯电缆的中性线；电缆或架空线路在建筑物或车间的进线处。 (4) repeat grounding. In low-voltage distribution system, to prevent losing ground fault protection function by neutral wire fault, cause shock hazard and damage to the equipment, to repeat grounding the neutral line. Repeated pick up location as follows: in the system of overhead line terminal and the appropriate point in the circuit; The neutral line of 4 core cable; Cables