正品銅芯鎧裝高壓電纜線-YJV22-2*16
電纜額定電壓的選擇 Voltage designation · 電纜的額定電壓應(yīng)適合于電纜系統(tǒng)的運(yùn)行狀況,用U0/U(Um)kv表示。 U0-電纜設(shè)計(jì)用的導(dǎo)體對(duì)地或金屬屏蔽之間的額定工頻電壓; U-電纜設(shè)計(jì)用的導(dǎo)體間的額定工頻電壓; Um-設(shè)備可承受的“Z高系統(tǒng)電壓”的Z大值。 The rated voltage of the cable for a given applixation shall be suitable for the operating conditions in the system in which the cable is used,and is expressed in the form of U0/U(Um)kv Where: U0-The rated power-frequency voltage between conductors and earth metallic screen ,for which the cable designed; U - The rated power-frequency voltage between conductos, for which the cable designed; Um- The maximum value of the“highest system voltage”for which the equipment may beused. · 三相系統(tǒng)用電纜的U0值推薦如下表: The values of U0 recommened for cable to be used in three-phase systems are listed below:
高壓電力電纜專業(yè)生產(chǎn)廠家 |
U kv | U m kv | U 0 * kv | A 和 B 類系統(tǒng) System categories A and B | C 類系統(tǒng) Systems categories C |
| 6 | 7.2 | 3.6 | 6 |
| 10 | 12 | 6 | 8.7 |
| 15 | 17.5 | 8.7 | 12 |
| 20 | 24 | 12 | 18 |
| 30 | 36 | 18 | - |
| 35 | 40.5 | 21 | 26 |
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A類系統(tǒng)──該類系統(tǒng)任何一相導(dǎo)體與地和接地導(dǎo)體接觸時(shí),能在1min內(nèi)與系統(tǒng)分離 B類系統(tǒng)──該類系統(tǒng)僅包括單相接地故障短時(shí)運(yùn)行的條件,接地故障時(shí)間應(yīng)不超過1h, 但在任何情況下,Z長(zhǎng)不超過8h每年接地故障總持續(xù)時(shí)間不超過125h; C類系統(tǒng)──不屬于A類、B類的系統(tǒng)。 System category A──This category comprises those systems in which any phase conductor that comes in contact with earth or an earth conductor. is disconnected from the system within 1 min. System category B ──This category comprises those system which,under faultconditions,are operated,are operated for ashorttimewith one phase earthed.This period should not exceed 1 h..Fora longer period, not exceeding 8h on any occasion, can be tolerated.The total duration of earth faults in any year should not exceed 125h. System categeory C──This category comprises all systems which do not fall into A and B 電纜的型號(hào)Type of cable
正品銅芯鎧裝高壓電纜線-YJV22-2*16
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型號(hào) Type | 名稱 Designation | 適用范圍 Application | YJV | 銅芯交聯(lián)聚乙烯絕緣氯乙烯護(hù)套電力電纜 Copper conductor,XLPE insulated and PVC sheathed power cable | 室內(nèi)、隧道及電纜溝等場(chǎng)所,不能承受機(jī)械外力。單芯電纜不允許敷設(shè)在磁性管道中。 For laying indoors 、 intunnel or cable trench,unable to bear external mechan-icalforces.Single-core cable in magnetic duct is not permissible | YJLY | 鋁芯交聯(lián)聚乙烯絕緣乙烯護(hù)套電力電纜 Aluminium conductor, XLPE insulated and PVC sheathed power cable | YJY | 銅芯交聯(lián)聚乙烯絕緣氯乙烯護(hù)套電力電纜 Copper conductor ,XLPE insulated and PEsheathed power cable | YJLY | 鋁芯交聯(lián)聚乙烯絕緣氯乙烯護(hù)套電力電纜 Alumimium conductor ,XLPE
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礦用橡套電纜結(jié)構(gòu)特點(diǎn):
一:導(dǎo)電線芯。柔軟性要求以電鉆電纜,采掘機(jī)電纜為Z高;導(dǎo)線結(jié)構(gòu)采取如下措施:
1, 采用較軟的細(xì)直徑銅單線、以小節(jié)距束合、復(fù)絞。整根電纜的彎曲扭轉(zhuǎn)性還受到絕緣、護(hù)套結(jié)構(gòu)的影響,因此不能認(rèn)為單絲越細(xì),節(jié)距越小越好。
2, 采用同向束絞和復(fù)絞可提高柔軟性。
3, 為了便于導(dǎo)線在絕緣層中的相對(duì)滑動(dòng)和便于安裝維修。電鉆電纜和小截面的采掘機(jī)電纜導(dǎo)線單絲應(yīng)鍍錫,大截面采掘機(jī)電纜在導(dǎo)線外還用包紙帶隔離絕緣。
二:絕緣層 要求有足夠的電絕緣性能
1, 采用含膠量不低于百分之35的橡皮
2, 絕緣厚度比通用橡套電纜要厚
3, 采用電性好的橡皮,并采用好的擠橡工藝(如擠橡硫化連續(xù)生產(chǎn)線)
三:屏蔽層
采用半導(dǎo)電橡皮做屏蔽層,應(yīng)使其過渡電阻達(dá)到標(biāo)準(zhǔn)要求,以保證繼電保護(hù)系統(tǒng)在事故狀態(tài)下可靠動(dòng)作。
四:墊芯
1, 墊芯要充分起到在電纜收到?jīng)_砸、擠壓時(shí)的緩沖作用,又不能過大使外徑過大。要求設(shè)計(jì)合理填滿絕緣芯線間的空隙。
2, 機(jī)械性能應(yīng)不低于絕緣橡皮的要求。
3, 不能與絕緣線芯產(chǎn)生粘連。
五:成纜結(jié)構(gòu)
1, 要采用較小的節(jié)距倍數(shù),改善電纜的柔軟性。
2, 為保證地線芯的機(jī)械強(qiáng)度,地線芯截面比通用電纜要大些,小截面產(chǎn)品,采用與主線管相同截面。
3, 控制線芯先單獨(dú)絞合成組,再與主線芯一起成纜。
六:護(hù)層
1, 要求有足夠的機(jī)械強(qiáng)度,耐磨性好。井下電纜要求阻燃。因此采用氯丁膠,且含膠量不小于百分之五十。
2, 6KV移動(dòng)橡套電纜要求護(hù)套有足夠的電絕緣性,改善護(hù)套的耐電暈開裂性能。
七:電纜要結(jié)構(gòu)密實(shí)、緊湊,各元件有相對(duì)滑動(dòng)性。