【正文】 the Lightning could be more casual Liuxie people, to achieve the objective of current limit, overvoltage at the same time will reduce to a certain extent, cmine use With lower residual pressure of the mine installations, you can loop in the remaining scattered lightning Liuxie people, to limit the purpose of overvoltage, overvoltage equipment can be reduced to the level of tolerance. The main power supply system is inhibited lightning protection and operation of the power back to the road and overvoltage surge. According to the substation status of the substation of the second minesensing system and the operation and use of two overvoltage protection. As build more substations in the region more open, relatively strong electromagic strength, power lines and munication cables are very vulnerable to lightning attacks sensors, sensors along the overvoltage power lines and munication lines into one device, which will damage equipment, Therefore, the exchange of firstclass bus to install the power protection (B level) is to ensure the safety of the entire control room, and 80 percent of the overvoltage China, scattered to the earth, play a primary role in the protection, but are still in the exchange of feeder Some of the Blevel power supply voltage and mine the residual pressure increases online and must therefore be important in the exchange of feeder lines (DC charging screen, UPS, etc.) clevel power protection, which would curb overvoltage electrical equipment to backend To the level of tolerance. Protective location: It is 1 EC1312 (LEMP protection in the region of lightning protection principles. Arrester installation should be in different locations at the junction of protected areas, this work, the firstclass protection should be located in the bus exchange. In Two on the bus with the installation of a Bclass models of a threephase power supply voltage surge protector. Install Location: AC bus (cabi). secondclass protection measures to deal with For the more important feeder lines on the exchange of equipment, here for the DC charge screen, the installation of clevel threephase power arrester. As DC charging screen is twoway exchange of electricity supply, so the screen in the DC charge with the installation of two models of clevel threephase power supply overvoltage surge protector. Installation location should choose the DC charge screen open exchange of air power Commissioner Office. integrated automation system overvoltage protection Protective position: Computerbased integrated automation system39。隨著綜合自動化系統(tǒng)和通信自動化系統(tǒng)等二次弱電系統(tǒng)在變電站的廣泛應(yīng)用，這類電子系統(tǒng) (設(shè)備 )元器件的集成度愈來愈高，信息存儲量愈來愈大，速度和精度不斷提高，而工作電壓只有幾伏，信息電流僅為微安級，因而對外界干擾極其敏感，特別對雷電等電磁脈沖和過電壓的耐受能力很低。 2 過電壓保護設(shè)計 IEC(國際電工委員會 )TC／ 81 技術(shù)委員會將防雷分為外部防雷和內(nèi)部防雷兩個部分 ，外部防雷是指避雷針 (或避雷帶、避雷網(wǎng) )、引下線和接地系統(tǒng)，是被保護物體免受直接雷擊；內(nèi)部防雷則是防止雷電和其他內(nèi)部過電壓侵入設(shè)備造成的毀壞。因此，在數(shù)據(jù)通訊接 I： I 中串人浪涌過電壓防護器后，必須對數(shù)據(jù)的傳輸情況進行認真檢查，如發(fā)現(xiàn)數(shù)據(jù)無 法正常傳輸，則有可能是由于不匹配的原因?qū)е聦鬏斝盘柕母蓴_，應(yīng)更換相匹配的浪涌過電壓防護器。 B 級防雷一般采用具有較大通流容量的防雷裝置，可以將較大的雷電流泄散 人地，從而達到限流的目的，同時將過電壓減小到一定的程度， c 級防雷采用具有較低殘壓的防雷裝置，可以將回路中剩余的雷電流泄散人地，達到限制過電壓的目的，使過電壓減小到設(shè)備能耐受的水平。 3． 1． 1 第一級防護處理措施 防護位置：據(jù) 1EC1312(雷電電磁脈沖的防護》中的雷電保護區(qū)域的劃分原則。 3． 1． 2 第二級防護處理措施 對于較為重要的交流饋線上的設(shè)備，此處為直流充電屏，加裝 c 級三相電源避雷器。安裝位置宜選擇在綜合自動化屏交流電源空氣開關(guān)處。 3． 4 通信接口過電壓防護 通信接口過電壓防護同電網(wǎng)供電系統(tǒng)相比，此回路對過電壓的敏感程度要高得多，且這些設(shè)備在有過電壓的情況下顯得非常脆弱。 3． 4． 1 微機遠動設(shè)備接口過電壓防護 防護位置：由于變電站微機遠動裝置采用分布分散式結(jié)構(gòu)。安裝位置宜選擇在微機遠動裝置通信線路接口處。安裝位置宜選擇在靠近電子電能表的 RS232 端口處。對一次回路的各種保護、測量、控制、調(diào)節(jié)信號通過光纖、數(shù)據(jù)通信網(wǎng)絡(luò)或載波向遠方 (省調(diào)、地調(diào)、集控站等 )傳送數(shù)據(jù)。 。安裝位置宜選擇在遠動裝置通信線路接口處。安裝位置宜選擇在內(nèi)線電話出線端和外線電話的人線端。由于電能表與站內(nèi)微機遠動設(shè)備的通信采用 RS232 的接口，其通信線路較長，又處在 LVZOB區(qū)域，在變電站附近或變電站遭受直接雷擊時，將感應(yīng)出較強的感應(yīng)過電壓，為了防止設(shè)備的損壞。各單元模塊都裝設(shè)在不同的自動化屏內(nèi)，模塊之間通過 RS232接口或現(xiàn)場總線進行通信。與這些設(shè)備相連的有信號線、數(shù)據(jù)線、測量和控制線路，并且這些線路基本上是處于 LPZOB 區(qū)域，也有穿過 LVZOA 區(qū)域的，線路上的感應(yīng)過電壓相對較強，根據(jù) IEC 的測試，當(dāng)電磁場強度增大到 0． 07GS 時，微型計算機設(shè)備將產(chǎn)生誤動，丟失數(shù)據(jù)。選用型號：選用 (UPS 為單相電源輸入時 )C 級單相電源浪涌過電壓保護器或 (UPS 為三相電源輸入時 )的c 級三相電源浪涌過電壓保護器。安裝位置宜選擇在直流充電屏交流電源空氣開關(guān)處。在兩根母線上各加裝一個同型號的 B 級三相電源浪涌過電壓保護器。根據(jù)變電站的現(xiàn)狀，對變電站的二次系統(tǒng)感應(yīng)雷及操作過電壓采用兩級防護。 3 變電站系統(tǒng)過電壓防護 3． 1 站用電系統(tǒng)過電壓防護 安裝在變電站內(nèi)的通信調(diào)度自動化系統(tǒng)大多采用交流電源或直流電源為其設(shè)備供電，在其整流環(huán)節(jié)，一般有較大容量的濾波電容，對瞬態(tài)過電壓沖擊有一定的吸收作用，站用變壓器低壓側(cè)到站用饋電屏之間采用的是屏蔽電纜且設(shè)備都有良好的接地，運用現(xiàn)代防雷技術(shù)來分析，必須增加 回