【正文】 hile the potential for 10 kV), due to the increased potential of the counter lines and equipment damaged lines and equipment and the events have occurred, therefore, despite the substation outside the mine system (lightning rod. Yin Xiaxian And grounding devices) in line with national standards and the requirements of Buban, and the integrated automation and munications automation systems, such as weak secondary have been taken, such as shielding, grounding, isolation, filtering, and other measures, but it can not pletely avoid overvoltage powerful lightning And voltage of the system counter the disruption caused damage and, therefore, the second weak system substation and a minevoltage must also take the appropriate protective measures, in accordance with the IEC within the mine area EMP, the device39。 3 變電站系統(tǒng)過(guò)電壓防護(hù) 3． 1 站用電系統(tǒng)過(guò)電壓防護(hù) 安裝在變電站內(nèi)的通信調(diào)度自動(dòng)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(duì)瞬態(tài)過(guò)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(yùn)用現(xiàn)代防雷技術(shù)來(lái)分析，必須增加 回路的分流措施，因?yàn)槠涔ぷ鹘拥?、保護(hù)接地都與其它電氣設(shè)備采用同一接地裝置，而且設(shè)備都處于 LPZOB 區(qū)，電磁脈沖強(qiáng)度相對(duì)較強(qiáng)，在站用變低壓側(cè)雖然有防止線路侵人波的避雷器，但殘壓高，因此在變電站遭受雷擊時(shí)，通過(guò)線路耦合和地電位升高而造成的反擊過(guò)電壓依然存在，而且高壓側(cè)的殘壓高達(dá)幾千伏，因此必須對(duì)這些調(diào)度自動(dòng)化設(shè)備的供電回路進(jìn)行過(guò)電壓保護(hù)。選用型號(hào)：選用 (UPS 為單相電源輸入時(shí) )C 級(jí)單相電源浪涌過(guò)電壓保護(hù)器或 (UPS 為三相電源輸入時(shí) )的c 級(jí)三相電源浪涌過(guò)電壓保護(hù)器。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。安裝位置宜選擇在靠近電子電能表的 RS232 端口處。安裝位置宜選擇在綜合自動(dòng)化屏交流電源空氣開(kāi)關(guān)處。因此，在數(shù)據(jù)通訊接 I： I 中串人浪涌過(guò)電壓防護(hù)器后，必須對(duì)數(shù)據(jù)的傳輸情況進(jìn)行認(rèn)真檢查，如發(fā)現(xiàn)數(shù)據(jù)無(wú) 法正常傳輸，則有可能是由于不匹配的原因?qū)е聦?duì)傳輸信號(hào)的干擾，應(yīng)更換相匹配的浪涌過(guò)電壓防護(hù)器。s power cord, signal Lines, data lines, and the installation of lightning protection and internal overvoltage devices to prevent lightning sensors, channeling people along the lightning current, voltage counterattack, such as transient voltage surge too transient overvoltage caused by a fault and damaged electronic equipment. Overvoltage surge protection in accordance with its connection mode is divided into two series and parallel, the use of overvoltage surge protection tandem with, there may exist because of signal transmission does not match the causes of transmission of the signal interference, in particular data Communication Interface in the series were overvoltage surge protection in place, will have the normal data munications. Therefore, the data munications access I: I in the series were overvoltage surge protection in place, the transmission of data must be carried out conscientiously check if the data are not normal transmission, it may be due to the reasons do not match the transmission signal Interference, should be replaced to match the overvoltage surge protection for. If the use of overvoltage surge protection for use of parallel, the situation is basically nonexistent, but the connection mode of overvoltage surge protection for higher technical requirements. 3 secondary system overvoltage substation protection points overvoltage electricity system protection Substation installed in the munications dispatch automation systems are used AC power or a DC power supply equipment for the rectification of its links are generally larger capacity filter capacitance, the transient overvoltage shock absorption of a certain extent, the station Lowvoltage transformer side go to feed between the screen using a shielded cable and equipment have a good grounding, the use of modern technology to analyze mine, we must increase the circuit39。根據(jù)雷電防護(hù)區(qū)域的劃分原則，變電站內(nèi)二次設(shè)備供電系統(tǒng)感應(yīng)雷電過(guò)電壓的防護(hù)可以按兩級(jí) (B、 C 級(jí) )來(lái)進(jìn)行分流保護(hù)。安裝位置宜選擇在 UPS 電源進(jìn)線前端。 3． 4． 3 遠(yuǎn)方通信接口過(guò)電壓保護(hù) 防護(hù)位置：由于變電站基本采用無(wú)人值守。在靠近電子電能表的 RS232 端口加裝 RS232 的浪涌過(guò)電壓保護(hù)器。 3． 2 綜合自動(dòng)化系統(tǒng)過(guò)電壓防護(hù) 防護(hù)位置：微機(jī)型綜合自動(dòng)化系統(tǒng)承受過(guò)電壓的能力極低，幾百伏的過(guò)電壓就足以將設(shè)備損壞，因此必須對(duì)高壓側(cè)避雷器的殘壓 (幾千伏 )進(jìn)行進(jìn)一步的抑制，以滿足設(shè)備絕緣水平的需要，同時(shí)由于地電位升高而感應(yīng)到電源回路零線 的過(guò)電壓也高達(dá)上千伏，因此必須在采用交流綜合自動(dòng)化系統(tǒng)的交流回路上加裝 c 級(jí)單相浪涌過(guò)電壓保護(hù)器。浪涌過(guò)電壓保護(hù)器根據(jù)其接線方式分為串聯(lián)和并聯(lián)兩種，使用串聯(lián)浪涌過(guò)電壓保護(hù)器時(shí)，有可能存在由于傳輸信號(hào)不匹配的原因?qū)е聦?duì)傳輸信號(hào)有干擾的情況，特別是數(shù)據(jù)通信接口在串人浪涌過(guò)電壓防護(hù)器后，會(huì)產(chǎn)生數(shù)據(jù)無(wú)法正常通訊。s segregation measures, because its grounding, protection and other electrical grounding all Grounding devices using the same equipment, and equipment are in a LPZOB, the relative strength of strong electromagic pulse, the station changed to prevent lowpressure side although there are lines intrusive wave arrester, but the residual pressure high, in the substation of lightning, t