【正文】 ion is very have been equipped with various protection devices, these devices are based on lower shortcircuit load to a maximum load conditions, such as configuration settings and, therefore, in the event of the failure was similar to the specific circumstances under to judge by the system should automatically trip protection, and now the protection of the whole trip has been a very short time, the lifting of the fault, the system will automatically reclosing devices and the gateway to restore power quickly. This is to protect the lower the load is very favorable. This will not only protect the safety of the load equipment is in favor of extending the service life and reduce equipment investment, and improved reliability of electricity supply, which is to improve the efficiency of industrial and agricultural production is very in the efficiency of industrial products means lower product costs, increase market petitiveness, which will enable enterprises to increase for the national economy and make a greater contribution to development. Electricity supply reliability and other fields, can improve people39。按其在電力系統(tǒng)中的地位可分為樞紐變電所、中間變電所和終端變電所。同時進行各種變壓器的選擇，從而確定變電站的接線方式，再進行短路電流計算，選擇送配電網(wǎng)絡及導線，進行短路電流計算。第五章是電氣設備的選擇，電氣設備包括母線、斷路器、隔離開關、電流和電壓互感器、熔斷器。首先根據(jù)任務書上所給系統(tǒng)與線路及所有負荷的參數(shù)，分析負荷發(fā)展趨勢。變電所的主要設備有電力變壓器，母線和開關設備等。所以輸送和分配電能是十分重要的一環(huán)。由于電能在工業(yè)及國民經(jīng)濟的重要性，電能的輸送和分配是電能應用于這些領域不可缺少的組成部分。下面的所設計得就是10KV降壓變電所。本次設計任務旨在體現(xiàn)對本專業(yè)各科知識的掌握程度，同時檢驗本專業(yè)的學習結果。第六章是配電裝置，主要對變電站的配電裝置進行設計。選擇變電站高低壓電氣設備，為變電站平面及剖面圖提供依據(jù)。這就要求變電所的一次部分經(jīng)濟合理，二次部分安全可靠，只有這樣變電所才能正常的運行工作，為國民經(jīng)濟服務。s quality of life, improve their living conditions. Analyse change to give or get an electric shock a mission for carrying and customers carries etc. circumstance, choose the address, make good use of customer data proceed then carry calculation, ascertain the correct equipment of the customer. At the same time following the choice of every kind of transformer, then make sure the line method of the transformer substation, then calculate the shortcircuit electric current, choosing to send together with the electric wire method and the style of the wire, then proceeding the calculation of shortcircuit electric current. This first step of design included:(1) ascertain the total project (2) load analysis(3) the calculation of the shortcircuit electric current (4) the design of an electric shock the system design to connect with system and the choice of line project (5) the choice and the settle of the protective facility (6) the contents to defend the thunder and protection of connect the earth. Along with the high and quick de