BVR4平方太陽(yáng)能光伏接地線生產(chǎn)加工
家用電器設(shè)備由于絕緣性能不好或使用環(huán)境潮濕,會(huì)導(dǎo)致其外殼帶有一定靜電,嚴(yán)重時(shí)會(huì)發(fā)生觸電事故。為了避免出現(xiàn)的事故可在電器的金屬外殼上面連接一根電線,將電線的另一端接入大地,一旦電器發(fā)生漏電時(shí)接地線會(huì)把靜電帶入到大地釋放掉。另外對(duì)于電器維修人員在使用電烙鐵焊接電路時(shí),有時(shí)會(huì)因?yàn)殡娎予F帶電而擊穿損壞電器中的集成電路,這一點(diǎn)比較重要。使用電腦的朋友有時(shí)也會(huì)忽略主機(jī)殼接地,其實(shí)給電腦主機(jī)殼接根地線,在一定程度上可以防止死機(jī)現(xiàn)象的出現(xiàn)。在電力系統(tǒng)中接地線:是為了在已停電的設(shè)備和線路上意外地出現(xiàn)電壓時(shí)保證工作人員的重要工具。按部頒規(guī)定,接地線必須是以上裸銅軟線制成電器中,接地線就是接在電氣設(shè)備外殼等部位及時(shí)的將因各種原因產(chǎn)生的不安全的電荷或者漏電電流導(dǎo)出的線路。
太陽(yáng)能光伏發(fā)電系統(tǒng)防雷接地方案從光伏建筑一體化發(fā)電系統(tǒng)的結(jié)構(gòu)來(lái)分析,雷電入侵太陽(yáng)能光伏發(fā)電系統(tǒng)主要通過(guò)以下四個(gè)途徑:(1)直擊雷:雷電直接擊中太陽(yáng)能光伏發(fā)電系統(tǒng)的電池方陣,破壞電池板。(2)地電位反擊:雷電擊中外部防雷裝置時(shí),在接地裝置附近產(chǎn)生的過(guò)電壓,通過(guò)接地線對(duì)靠近它的電子設(shè)備的高電位反擊,入侵電壓可高達(dá)數(shù)萬(wàn)伏。(3)太陽(yáng)能電池板的靜電感應(yīng):帶電荷的云對(duì)地面放電時(shí),整個(gè)光伏方陣像一個(gè)大型環(huán)型天線一樣感應(yīng)出上萬(wàn)伏的過(guò)電壓,通過(guò)直流輸入線路引入,擊壞與線路相連的光伏系統(tǒng)設(shè)備。(4)閃電電涌侵入輸出供電線路:供電設(shè)備及供電線路遭受雷擊時(shí),在電源線上出現(xiàn)的雷電過(guò)電壓平均可達(dá)上萬(wàn)伏,雷電電磁脈沖沿電源線浸入光伏微電子設(shè)備及系統(tǒng),可對(duì)系統(tǒng)設(shè)備造成毀滅性的打擊。
核實(shí)接地棒的電壓等級(jí)與操作設(shè)備的電壓等級(jí)是否一致。
電器中,接地線就是接在電氣設(shè)備外殼等部位及時(shí)的將因各種原因產(chǎn)生的不安全的電荷或者漏電電流導(dǎo)出的線路。
根據(jù)中性線與保護(hù)線是否合并的情況,TN系統(tǒng)又分為T(mén)N-C、TN-S及TN-C-S系統(tǒng)。 TN-C系統(tǒng):保護(hù)線與中性線合并為PEN線。 TN-S系統(tǒng):保護(hù)線與中性線分開(kāi)。 TN-C-S系統(tǒng):在靠近電源側(cè)一段的保護(hù)線和中性線合并為PEN線,從某點(diǎn)以后分為保護(hù)線和中性線。
高壓短路接地線對(duì)地電阻要求決定了接地線的品質(zhì),一般按照電力行業(yè)DL-T879-2004技術(shù)規(guī)定要求每個(gè)截面積的接地線對(duì)地電阻不的大于下列數(shù)值:接線鼻之間測(cè)量直流電阻,對(duì)于16mm2 ,25mm2,35mm2,50mm2,70mm2,95mm2,120mm2的各種截面,平均每米的電阻值應(yīng)分別小于1.24mΩ, 0.79mΩ,0.56mΩ,0.40mΩ,0.28mΩ,0.21mΩ,0.16mΩ[1] 。
nd. The Bishop gives an account of an interview which he and Helfenstein, the new imperial ambassador had with the Queen in February, and it is b that at this time she was again very anxious to beguile the Emperor into sending his son on chance. But Helfenstein was a very different sort of ambassador from Renstein, and she could not do much with him; his idea being to hold her at arm’s length until she was forced to write to the Emperor herself, as she promised to do, in which case it would not, he thought, be difficult to construe something she might say into a pledg
工作之前必須檢查接地線。軟銅線是否斷頭,螺絲連接處有無(wú)松動(dòng),線鉤的彈力是否正常,不符合要求應(yīng)及時(shí)調(diào)換或修好后再使用。
要愛(ài)護(hù)接地線。接地線在使用過(guò)程中不得扭花,不用時(shí)應(yīng)將軟銅線盤(pán)好,接地線在拆除后,不得從空中丟下或隨地亂摔,要用繩索傳遞,注意接地線的清潔工作。
工作接地方式主要有以下三種類型:(1)中性點(diǎn)非直接接地方式(I-T)。用電設(shè)備中性點(diǎn)不接入大地,(2)單個(gè)保護(hù)接地方式(T-T)。電源變壓器的中性點(diǎn)直接接地,用電設(shè)備外殼可導(dǎo)電部分直接接入大地(3)中性點(diǎn)直接接地方式(T-N)。在這種方式中,電力系統(tǒng)變壓器中性點(diǎn)直接接地,用電設(shè)備外殼可導(dǎo)電部分通過(guò)接地引下線和接地系統(tǒng)作良好的金屬性連接,。
光伏電站接地系統(tǒng) :接地電阻 為防止觸電或保護(hù)設(shè)備的安全,將設(shè)備和用電裝置的中性點(diǎn)、外殼或支架與接地裝置用導(dǎo)體作良好電氣連接叫做接地。接地系統(tǒng)包括需接地設(shè)備、接地引下線、接地體和大地。接地電阻是指電流由接地裝置流入大地再經(jīng)大地流向另一接地體或向遠(yuǎn)處擴(kuò)散所遇到的電阻,它包括接地引下線和接地體本身的電阻、接地體與大地之間的接觸電阻以及兩接地體之間大地的電阻或接地體到無(wú)限遠(yuǎn)處的大地電阻。接地電阻大小直接體現(xiàn)了電氣裝置與大地“接觸”的良好程度,是檢測(cè)接地系統(tǒng)是否合格的直接參數(shù)。
” he said, “in the best way I can, as I am still firm in my opinion that if any marriage at all is to result from all this it will be his.” Swetkowitz hurried back to Vienna with the English reply, and to explain to his the only b by which success was sible. Lutheran as he was, he would he given way upon the vital point of religion, although he confessed his fear that the Emperor would not do so; “but,” said he, “you must put up with a good deal to gain such a kingdom as this.” To he given up on the point of religion, however, would he made the match useless to Philip, and there was never any chance of the marriage being effected on such terms. Leicester, of course, did not know how pliable the Emperor migh
高壓接地線分類:(1)高壓接地線按照使用環(huán)境可以分為:室內(nèi)母排型接地線(JDX-NL)和室外線路型接地線(JDX-WS)。 (2)高壓接地線按照電壓等級(jí)可分為:10KV接地線,35KV高壓接地線,110KV接地線,220KV高壓接地線,500KV高壓接地線
高壓短路接地線對(duì)地電阻要求決定了接地線的品質(zhì),一般按照電力行業(yè)DL-T879-2004技術(shù)規(guī)定要求每個(gè)截面積的接地線對(duì)地電阻不的大于下列數(shù)值:接線鼻之間測(cè)量直流電阻,對(duì)于16mm2 ,25mm2,35mm2,50mm2,70mm2,95mm2,120mm2的各種截面,平均每米的電阻值應(yīng)分別小于1.24mΩ, 0.79mΩ,0.56mΩ,0.40mΩ,0.28mΩ,0.21mΩ,0.16mΩ[1] 。