接地线的接地方式的基本组成
一般在光伏电站中,接地引下线和接地体的电阻很小,多可忽略。系统的接地电阻主要为接地体到大地无限远处的电阻,即主要由接地体周围的土壤电阻率决定。 土壤电阻率
高压接地线分类:(1)高压接地线按照使用环境可以分为:室内母排型接地线(JDX-NL)和室外线路型接地线(JDX-WS)。 (2)高压接地线按照电压等级可分为:10KV接地线,35KV高压接地线,110KV接地线,220KV高压接地线,500KV高压接地线
核实接地棒的电压等级与操作设备的电压等级是否一致。
使用携带型短路接地线前,应先验电确认已停电,在设备上确认无电压后进行。先将接地线夹连接在接地网或扁铁件上,然后用接地操作棒分别将导线端线类拧紧在设备导线上。拆除短路接地线时,顺序正好与上述相反。
光伏电站接地系统敷设常会面临下列三项问题: a.选择主控室和各逆变器室位置 主控室和逆变器室应尽量选择在电阻率减低的土壤周围。但光伏电站各电气室受空间限制较大,亦可将接地体敷设在电阻率较低的土壤里。 b.使用化学降阻剂 化学降阻剂一般为高分子合成树脂和电解水溶液并混合固化剂而成。将其注入接地体周围后会变成固液混合形态,大大降低该处电阻率。主要应用于高寒和土壤电阻率较高地区。 c.接地体防腐 根据厂区土壤情况合理选择接地体材质,保质刷涂防腐漆,必要时可采取阴极保护。
根据中性线与保护线是否合并的情况,TN系统又分为TN-C、TN-S及TN-C-S系统。 TN-C系统:保护线与中性线合并为PEN线。 TN-S系统:保护线与中性线分开。 TN-C-S系统:在靠近电源侧一段的保护线和中性线合并为PEN线,从某点以后分为保护线和中性线。
eing conducted with the Emperor, and yet, said Norfolk, no sooner was the imperial ambassador gone than Leicester pushed his own courtship more strongly than ever. He was told plainly that if he did not desist evil would befall him, as all the nobility were against him; whereupon Leicester went off in a huff and sulked for a fortnight, until the Queen recalled him and petted him more than ever, upon which Norfolk in turn took umbrage and went home, leing the Archduke’s interests in the hands of Sus. For months this game of cross pures went on. One afternoon in February, 1566, Guzman saw the Queen walking with Leicester in the lower gallery overlooking the gardens of Whitehall. In conversation with the ambassador she praised her fourite to his face, and said that he was just trying to persuade her to marry, for the sake of herself, the country, and even on his (Leicester’s) account, as
现场工作不得少挂接地线或者擅自变更挂接地线地点。
在自动化科技飞速发展的今天,光伏电站已进入“无人值班,少人值守”的运行模式。接地系统的完善,作为保护设备、人身安全的重要保障,理应得到大家的重视。光伏电站的接地系统,除了应遵守国家有关规程、保证施工质量外,还要因地制宜,根据现场实际情况,分析工程特点,多对周边在运行项目进行调研学习,确保安全生产。
现今,随着光伏发电技术的日趋成熟和大量已建成光伏电站的运营,系统安全性已经成为了保障日常生产的重要因素。以往许多人们对于“小容量”光伏电站的接地、防雷问题并不重视,但随着太阳能电池板功率和电站系统容量的增大,近年来由于接地不良造成的人身触电伤亡事件已为数不少。本文将列举在建设过程中可能会遇到的接地施工问题并浅析接地技术。
光伏电站接地系统敷设常会面临下列三项问题: a.选择主控室和各逆变器室位置 主控室和逆变器室应尽量选择在电阻率减低的土壤周围。但光伏电站各电气室受空间限制较大,亦可将接地体敷设在电阻率较低的土壤里。 b.使用化学降阻剂 化学降阻剂一般为高分子合成树脂和电解水溶液并混合固化剂而成。将其注入接地体周围后会变成固液混合形态,大大降低该处电阻率。主要应用于高寒和土壤电阻率较高地区。 c.接地体防腐 根据厂区土壤情况合理选择接地体材质,保质刷涂防腐漆,必要时可采取阴极保护。
Spanish interests, “as the common people are so full of projects for marrying Madam Elizabeth to the Earl of Arundel or some one else.” On the 8th of November a committee of the Council went to Hatfield to see Elizabeth and deliver to her the dying Queen’s message, begging her “when she should be Queen to maintain the Catholic Church and pay her (Mary’s) des.” Elizabeth would pledge herself to nothing. She knew now that she must succeed, with or without Mary’s good-will, and she meant to he a free hand. Before the Queen d even, Feria, who had arrived when she was already almost unconscious, hastened to Hatfield to see the coming Queen. So long as he confined himself to courteous commonplace she answered him in the same spirit, but as
接地线、短路接地线使用说明以及维护一、接地,接地短路包括: 由短路接地绝缘操作杆、线夹、短路线、接地端子、结夹、接地夹等。 二、接地短路接地部分功能:(1)线夹、接地夹采用优质铝合金压铸、高强度。(2)操作杆与进口环氧树脂精制成彩色管,绝缘性能好,强度高,重量轻,颜色明亮,光滑的外观。分类的短路接地包括: (1)分相接地,结合型线。 (2)使用不同的电压,单节式、多型操作。 (3)一个变电站、线路短路接地。
现今,随着光伏发电技术的日趋成熟和大量已建成光伏电站的运营,系统安全性已经成为了保障日常生产的重要因素。以往许多人们对于“小容量”光伏电站的接地、防雷问题并不重视,但随着太阳能电池板功率和电站系统容量的增大,近年来由于接地不良造成的人身触电伤亡事件已为数不少。本文将列举在建设过程中可能会遇到的接地施工问题并浅析接地技术。