【正文】 是電力系統(tǒng) 10kV 電壓等級的重要部分。變電所作為電力系統(tǒng)中一 個關鍵的環(huán)節(jié)也同樣在新技術領域得到了充分的發(fā)展。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。 6 變電所是電力系統(tǒng)的一個重要組成部分，由電器設 備及配電網(wǎng)絡按一定的接線方式所構成，他從電力系統(tǒng)取得電能，通過其變換、分配、輸送與保護等功能，然后將電能安全、可靠、經(jīng)濟的輸送到每一個用電設備的轉(zhuǎn)設場所。這對于保護下級各負荷是十分有利的。降壓變電所通常遠離發(fā)電廠而靠近負荷中心。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。 變電所是聯(lián)系發(fā)電廠和用戶的中間環(huán)節(jié)，起著變換和分配電能的作用。其功能運行情況、容量大小直接影響下級負荷的供電，進而影響工業(yè)生產(chǎn)及生活用電。 電力工業(yè)是國民經(jīng)濟的一項基礎工業(yè)和國民經(jīng)濟發(fā)展的先行工業(yè)，它是一種將煤、石油、天然氣、水能、核能、風能等一 次能源轉(zhuǎn)換成電能這個二次能源的工業(yè)，它為國民經(jīng)濟的其他各部門快速、穩(wěn)定發(fā)展提供足夠的動力，其發(fā)展水平是反映國家經(jīng)濟發(fā)展水平的重要標志。 Therefore, power transmission and distribution is critical. Substation is to enable superior power plant power plants or power after adjustments to the lower load of books is an important part of power transmission. Operation of its functions, the capacity of a direct impact on the size of the lower load power, thereby affecting the industrial production and power system if a link failure, the system will protect the part of action. May result in power outages and so on, to the production and living a great disadvantage. Therefore, the substation in the electric power system for the protection of electricity reliability, 2 sensitivity and other indicators. Power plants and substations are connected user link in the middle, transformation and distribution of electric energy to play the role. According to the different tasks substation can be divided into stepup transformer stepdown transformer substation and two broad categories. Stepup substation built on the general power plant, the general stepdown transformer near the load center built on the can also be divided according to medium voltage substation (60 kV and below), highvoltage substations (110 ~ 220 kV), EHV Substation (330 ~ 765 kV) and Ultra High Voltage Substation (1000 kV and above). In electric power system according to their status as a hub substation can be divided into the middle substation substations and terminals. This requires a substation part of economic rationality, the second part of safe and reliable, the only way to the normal operation of substation work services for the national economy. There are stepup transformer stepdown transformer substation and two broad 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 autom