摘要:輸電線路是電力系統(tǒng)的大動脈，擔(dān)負著將電能從發(fā)電廠輸送到各地用電中心的重要任務(wù)，是連接各個變電站、各用電用戶的紐帶。輸電線路的安全運行，直接影響到了電網(wǎng)的穩(wěn)定和用戶的可靠供電。因此輸電線路的安全運行在電網(wǎng)中占據(jù)著舉足輕重的地位。

　　在保證輸電線路安全的措施中，自動重合閘是一個非常重要的裝置，因為在電力系統(tǒng)故障中，大多數(shù)是輸電線路（特別是架空線路）的故障。在這些故障中有“瞬時性故障”和“永久性故障”，因此在線路被斷開以后再進行一次合閘就有可能大大地提高供電的可靠性和減少停電損失。為此在電力系統(tǒng)中廣泛采用了當斷路器跳閘以后能夠自動地將斷路器重新合閘的自動重合閘裝置。

　　由于輸電線路長，地處曠野，因此極易遭受雷擊，電力系統(tǒng)的雷害事故中以輸電線路的事故占大多數(shù)。雷擊是造成線路跳閘的主要原因。同時雷擊線路時形成的雷電過電壓波會沿線路侵入到變電站，危機變電站內(nèi)電氣設(shè)備的安全。加強輸電線路的防雷是減少電力系統(tǒng)雷害事故的關(guān)鍵，因此對輸電線路的防雷保護應(yīng)給與充分的重視。

　　 本設(shè)計的主要內(nèi)容包括：首先通過輸送容量、線路長度、功率因數(shù)以及利用電流經(jīng)濟密度來確定導(dǎo)線型號，設(shè)計出輸電線路的主接線圖，其次再對輸電線路的防雷保護和線路保護進行選擇和設(shè)計，最后再對輸電線路的自動重合閘進行選擇和設(shè)計。

關(guān)鍵詞：35KV輸電線路；線路主接線；防雷保護；線路保護；自動重合閘。

Abstract:Transmission lines is the artery of power system, assuming the energy from the plant to distribute it an important task of electricity center, is to connect each substation, the electricity users of the link. The safe operation of the transmission line, directly affecting the stability of the power grid and the user's reliable power supply. So the transmission lines in the safe operation of the power of holds an important position.

In order to ensure the safety of the transmission line measures, automatic reclosing is a very important devices, because in electric power system fault, most is the transmission lines (especially the overhead lines) fault. In these fault in the "the almost fault" and "permanent fault", so in line be disconnected again after a close brake may greatly improve the reliability of the power supply and reduce the loss of power. Therefore in the power system is widely used in a circuit breaker tripped later can automatically will circuit breaker feeder to automatic reclosing device.

  Because the transmission lines long, is located in the wilderness, so easily shock, electric power system against accident to ray transmission lines accident majority. Lightning is caused line the main reason for the trip. At the same time lightning lines formed when lightning overvoltage waves along the road will invade substations, the crisis in the transformer substation of electrical equipment safety. Strengthen transmission line lightning protection is to reduce the harm of electric power system ray accident key, so the transmission line lightning protection should be given sufficient attention.

  The design of the main content includes: first through the transmission capacity, line length and power factor and the use of current economic density to determine the wire types, and the design of the Lord the wiring diagram transmission lines, and then the lightning protection for transmission lines and line protection to choose and design, and finally to the transmission lines to the automatic reclosing selection and design.

Key words：35 KV transmission lines; The wiring circuit; Lightning protection; Line protection; Automatic reclosing.