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    J9九游会AG高压电缆与35KV高压电缆安装分析
    J9九游会AG高压电缆与35KV高压电缆安装分析

    通过对一同35kV高压电(dian)(dian)(dian)缆(lan)装置缺点的(de)剖(pou)析(xi)和(he)处(chu)理,用矢量法剖(pou)析(xi)评论了(le)电(dian)(dian)(dian)缆(lan)线路敷设(she)、装置过程中(zhong)护套选用完好(hao)的(de)穿插互联换位接地(di)办法下(xia),电(dian)(dian)(dian)缆(lan)金属护套中(zhong)的(de)感(gan)应(ying)电(dian)(dian)(dian)势(shi)和(he)环(huan)流幅值(zhi)改(gai)动,提(ti)出并施(shi)行科(ke)学的(de)同轴电(dian)(dian)(dian)缆(lan)接线办法,方便有用地(di)下(xia)降感(gan)应(ying)电(dian)(dian)(dian)势(shi)和(he)环(huan)流幅值(zhi),排(pai)除(chu)了(le)运转毛病。

    供电(dian)(dian)(dian)线路(lu)(lu)改(gai)造工程(cheng)中(zhong),从福联(lian)乙烯项目220kV中(zhong)心(xin)变电(dian)(dian)(dian)站35kV开(kai)关柜(ju)引两(liang)条35KV高压电(dian)(dian)(dian)缆(lan)(lan)到(dao)新油库配电(dian)(dian)(dian)中(zhong)心(xin)。电(dian)(dian)(dian)缆(lan)(lan)编号为MSSGH02-29SGH01-01和(he)MSSGH02-29SGH01-02。电(dian)(dian)(dian)缆(lan)(lan)每回路(lu)(lu)长6430m(电(dian)(dian)(dian)缆(lan)(lan)段长分别为1200、1200、1200、980、1080、990m)、中(zhong)心(xin)绝(jue)缘接(jie)(jie)头4组,金(jin)属(shu)护(hu)(hu)套选用(yong)穿插互(hu)联(lian)接(jie)(jie)地(di),即电(dian)(dian)(dian)缆(lan)(lan)两(liang)边(bian)终端及中(zhong)心(xin)头金(jin)属(shu)护(hu)(hu)套通过直(zhi)接(jie)(jie)接(jie)(jie)地(di)小箱直(zhi)接(jie)(jie)接(jie)(jie)地(di)、绝(jue)缘接(jie)(jie)头处护(hu)(hu)套三(san)相之(zhi)间用(yong)同轴电(dian)(dian)(dian)缆(lan)(lan)经穿插互(hu)联(lian)箱(内有一(yi)组保护(hu)(hu)器)进行换位衔接(jie)(jie)。即电(dian)(dian)(dian)缆(lan)(lan)线路(lu)(lu)敷设、装置过程(cheng)中(zhong)护(hu)(hu)套选用(yong)完好的(de)穿插互(hu)联(lian)换位接(jie)(jie)地(di)办法(fa)。

    在装置调试后(hou)投入试运(yun)转一段时间后(hou),发(fa)现MSSGH02-29SGH01-01电(dian)缆送电(dian)端及中心(xin)接(jie)(jie)地(di)(di)处接(jie)(jie)地(di)(di)线(xian)发(fa)热严(yan)峻(jun)。首要对这回路电(dian)缆金(jin)属护套(tao)环流(liu)进行测(ce)验,测(ce)验时该电(dian)缆载(zai)流(liu)量为(wei)44A。两(liang)头的接(jie)(jie)地(di)(di)线(xian)接(jie)(jie)地(di)(di),电(dian)缆金(jin)属护套(tao)环流(liu)三(san)(san)相电(dian)流(liu)实(shi)测(ce)见表1。断开两(liang)头的接(jie)(jie)地(di)(di)线(xian),电(dian)缆结尾金(jin)属护套(tao)的感应电(dian)压三(san)(san)相均为(wei)60V。标明电(dian)缆的穿插互联接(jie)(jie)地(di)(di)系统存(cun)在严(yan)峻(jun)的缺点(dian)。

     

    表1 穿插(cha)互联换位处理前(qian)的护(hu)套内感应环流实验实测值(电缆始点(dian)方位A、B、C三相)

    查找和剖析所测出的缺点

    高压电缆查找和剖析所测出的缺点

    开始断定,回路(lu)电缆金(jin)属护套发生环流(liu),是因(yin)为穿插互联(lian)箱内接(jie)地(di)线(xian)换位(wei)有误,导(dao)致电缆结尾(wei)金(jin)属护套对地(di)开路(lu)电压(ya)很高(电缆穿插互联(lian)单元结尾(wei)金(jin)属护套感应(ying)电动势挨近零),而(er)电缆两(liang)边终端直(zhi)接(jie)接(jie)地(di),接(jie)地(di)系统(tong)构成了很大的环流(liu)。

    1 、穿(chuan)插互联原理

    将每大(da)段(duan)电(dian)(dian)(dian)(dian)(dian)缆(lan)分为(wei)长度(du)持平的(de)三(san)小(xiao)段(duan)每段(duan)之间(jian)装绝缘接(jie)头,接(jie)头处护层三(san)相(xiang)之间(jian)用同轴电(dian)(dian)(dian)(dian)(dian)缆(lan)引线经(jing)穿(chuan)插互联箱(xiang)及保护器进行换位衔接(jie)。使(shi)各大(da)段(duan)电(dian)(dian)(dian)(dian)(dian)缆(lan)上的(de)感应(ying)电(dian)(dian)(dian)(dian)(dian)压(ya)幅值(zhi)持平,相(xiang)位相(xiang)差120度(du)。总(zong)感应(ying)电(dian)(dian)(dian)(dian)(dian)压(ya)的(de)向量和为(wei)零,不行能发生(sheng)环形(xing)电(dian)(dian)(dian)(dian)(dian)流(liu)或者(zhe)说环流(liu)很小(xiao),感应(ying)电(dian)(dian)(dian)(dian)(dian)压(ya)最高值(zhi)小(xiao)于50V。

    穿插互(hu)联的效果(guo):

    通(tong)过穿(chuan)插互(hu)联(lian)箱(xiang)(xiang)换(huan)(huan)位(wei)(wei) —— 约(yue)(yue)束护(hu)(hu)层感应(ying)电(dian)压(ya)小于(yu)50V两头(tou)(tou)直接接地 —— 环流很(hen)小不(bu)受电(dian)缆线(xian)路长度约(yue)(yue)束 —— 可装(zhuang)多个绝缘(yuan)接头(tou)(tou)满足要(yao)求装(zhuang)设护(hu)(hu)层保(bao)护(hu)(hu)器 —— 有用(yong)约(yue)(yue)束雷电(dian)及操作过电(dian)压(ya)正常情况下,电(dian)缆金(jin)属护(hu)(hu)套的换(huan)(huan)位(wei)(wei)为(wei)(以A相为(wei)例(li)):Ⅰ段A相(A1)通(tong)过同轴电(dian)缆到(dao)1号穿(chuan)插互(hu)联(lian)箱(xiang)(xiang)换(huan)(huan)位(wei)(wei)至Ⅱ段C相(C2)、通(tong)过同轴电(dian)缆到(dao)2号互(hu)联(lian)箱(xiang)(xiang)换(huan)(huan)位(wei)(wei)至B相(B3),即A1-C2-B3换(huan)(huan)位(wei)(wei)法,参见图1。通(tong)过两个穿(chuan)插互(hu)联(lian)箱(xiang)(xiang),两次交(jiao)换(huan)(huan),完结感应(ying)电(dian)压(ya)叠加(jia)后向量为(wei)零,起到(dao)约(yue)(yue)束感应(ying)电(dian)压(ya)的效果。

    电缆回路穿插互联原理

    2、毛(mao)病剖析

    通过(guo)技(ji)术人员对MSSGH02-29SGH01-01电(dian)(dian)缆金属(shu)护套穿(chuan)(chuan)插互(hu)联(lian)接(jie)地系统的施(shi)工现(xian)场具体核(he)对,发现(xian)中心接(jie)头穿(chuan)(chuan)插互(hu)联(lian)换位的制造过(guo)程中,虽各相穿(chuan)(chuan)插互(hu)联(lian)换位接(jie)线(xian)无过(guo)错,但工程技(ji)术人员未注重(zhong)和核(he)实(shi)确# 1 、#2 绝(jue)(jue)缘接(jie)头的送(song)电(dian)(dian)端(duan)(duan)和受电(dian)(dian)端(duan)(duan)有(you)(you)必要(yao)(yao)共同的约(yue)好(hao),即# 1 、#2 绝(jue)(jue)缘接(jie)头同轴(zhou)电(dian)(dian)缆的外导体有(you)(you)必要(yao)(yao)从共同约(yue)好(hao)接(jie)送(song)电(dian)(dian)端(duan)(duan),同轴(zhou)电(dian)(dian)缆的内导体有(you)(you)必要(yao)(yao)从共同约(yue)好(hao)接(jie)受电(dian)(dian)端(duan)(duan)。#2 绝(jue)(jue)缘接(jie)头同轴(zhou)电(dian)(dian)缆过(guo)错接(jie)法如图3所示,构成护套内的感应电(dian)(dian)流(liu)方向与规划计划相反,致(zhi)(zhi)护套穿(chuan)(chuan)插互(hu)联(lian)换位失利(li),导致(zhi)(zhi)护套内环流(liu)增大。

    中(zhong)心(xin)接(jie)头穿插互(hu)联过错换(huan)(huan)位后的(de)电流流向如(ru)下(以A 相(xiang)(xiang)为(wei)例):即A 相(xiang)(xiang)护套中(zhong)的(de)感应电流经A 相(xiang)(xiang)护套至(zhi)(zhi)#1 绝缘(yuan)(yuan)接(jie)头的(de)同轴电缆外(wai)导体(ti)和(he)接(jie)头换(huan)(huan)位箱,再通过C 相(xiang)(xiang)#1 绝缘(yuan)(yuan)接(jie)头的(de)同轴电缆内导体(ti)至(zhi)(zhi)C 相(xiang)(xiang)第2 段(duan)(duan)电缆护套,经B 相(xiang)(xiang)# 2 绝缘(yuan)(yuan)接(jie)头的(de)同轴电缆内导体(ti)和(he)接(jie)头换(huan)(huan)位箱通过A 相(xiang)(xiang)# 2 绝缘(yuan)(yuan)接(jie)头的(de)同轴电缆外(wai)导体(ti)至(zhi)(zhi)A 相(xiang)(xiang)第3 段(duan)(duan)电缆的(de)护套最终入地(di)。

     

    因为# 1 、# 2 中心接头同轴电(dian)(dian)缆(lan)表里导体没有和送、受电(dian)(dian)端接点共(gong)同约(yue)好(hao), 装置(zhi)的35kV电(dian)(dian)缆(lan)穿插互联未到达护套(tao)换位意图。

    过错换位办(ban)法的合电(dian)压矢量图如图5 。因中(zhong)支线电(dian)缆(lan)金(jin)属(shu)护(hu)套(tao)选用图3所示过错的换位办(ban)法,理论(lun)剖(pou)析指(zhi)出电(dian)缆(lan)结尾金(jin)属(shu)护(hu)套(tao)的感应电(dian)压将(jiang)为单段金(jin)属(shu)护(hu)套(tao)感应电(dian)压的1.732倍。

    缺点的(de)损(sun)害(hai)

    35kV电缆这种因金属护(hu)套换(huan)位(wei)过错构成接地系统过大环流的缺点主(zhu)要有三大损害。

    (1)耗费了很多(duo)的(de)(de)电(dian)(dian)(dian)能(neng)。MSSGH02-29SGH01-01电(dian)(dian)(dian)缆(lan)每(mei)回路(lu)主(zhu)(zhu)供(gong)一只(zhi)50000kVA的(de)(de)主(zhu)(zhu)变,若电(dian)(dian)(dian)缆(lan)的(de)(de)年均匀载流量为(wei)150A,能(neng)够估(gu)算出电(dian)(dian)(dian)缆(lan)均匀环(huan)流I≥50A,接(jie)地(di)系统的(de)(de)回路(lu)电(dian)(dian)(dian)阻(包含金属护套电(dian)(dian)(dian)阻和接(jie)地(di)电(dian)(dian)(dian)阻)取R=0.25Ω,那么每(mei)年每(mei)回路(lu)电(dian)(dian)(dian)缆(lan)接(jie)地(di)系统耗费的(de)(de)电(dian)(dian)(dian)能(neng)为(wei):P=3I2RT=16.425kW·h

    可见电缆金(jin)属护套(tao)因换(huan)位(wei)过错构成的线损是(shi)十(shi)分惊人的。

    (2)下(xia)降(jiang)了电(dian)缆(lan)(lan)(lan)的(de)规(gui)(gui)划载流量。因为金属护套(tao)通过大(da)电(dian)流而发热,导致(zhi)电(dian)缆(lan)(lan)(lan)散(san)热困(kun)难,发热将(jiang)会加快(kuai)电(dian)缆(lan)(lan)(lan)主绝(jue)缘(yuan)老化,而且电(dian)缆(lan)(lan)(lan)的(de)最大(da)载流量较多只能到达规(gui)(gui)划值的(de)2/3,极大(da)地(di)浪费了资(zi)源。

    (3)下降了供(gong)电牢靠率。若(ruo)电缆(lan)接(jie)头同轴电缆(lan)与金属护(hu)套焊接(jie)处(chu)存(cun)在虚焊,而金属护(hu)套又通(tong)过大电流而简单损坏构成。

    正确穿插互联换位及(ji)解(jie)决计划


     

    针(zhen)对图1 接线过(guo)错,本(ben)文(wen)通过(guo)矢量(liang)法剖析和(he)核算后(hou)提出改造接点过(guo)错的(de)两(liang)种计划:

    直接(jie)(jie)(jie)将# 1或# 2接(jie)(jie)(jie)头(tou)同轴(zhou)电(dian)缆(lan)表里导体(ti)和(he)送(song)、受电(dian)端接(jie)(jie)(jie)点相互换(huan)(huan)(huan),按(an)图(tu)1接(jie)(jie)(jie)线(xian)办法(fa);将# 1 或# 2 接(jie)(jie)(jie)头(tou)换(huan)(huan)(huan)位箱中(zhong)(zhong)(zhong)(zhong)任一个连(lian)板按(an)图(tu)7的(de)(de)办法(fa)衔接(jie)(jie)(jie),护套(tao)中(zhong)(zhong)(zhong)(zhong)的(de)(de)感应电(dian)流(liu)(liu)(liu)(liu)流(liu)(liu)(liu)(liu)向则(ze)变(bian)为图(tu)7所示流(liu)(liu)(liu)(liu)向从(cong)A1-C2- B3入地(di)。鉴于电(dian)缆(lan)中(zhong)(zhong)(zhong)(zhong)心(xin)接(jie)(jie)(jie)头(tou)已(yi)制造(zao)完结(jie)、同轴(zhou)电(dian)缆(lan)内、外导体(ti)的(de)(de)接(jie)(jie)(jie)法(fa)不行更改的(de)(de)现状,仅(jin)有可改动的(de)(de)是穿(chuan)插(cha)互联(lian)换(huan)(huan)(huan)位接(jie)(jie)(jie)地(di)箱中(zhong)(zhong)(zhong)(zhong)的(de)(de)铜接(jie)(jie)(jie)板。福建炼油乙烯(xi)项目部(bu)选用用计划②处理。因而,将# 1 或# 2 中(zhong)(zhong)(zhong)(zhong)心(xin)穿(chuan)插(cha)互联(lian)换(huan)(huan)(huan)位接(jie)(jie)(jie)地(di)箱中(zhong)(zhong)(zhong)(zhong)的(de)(de)任一个连(lian)板按(an)图(tu)7 接(jie)(jie)(jie)线(xian)办法(fa)改造(zao),护层中(zhong)(zhong)(zhong)(zhong)的(de)(de)感应电(dian)流(liu)(liu)(liu)(liu)流(liu)(liu)(liu)(liu)向即可变(bian)为流(liu)(liu)(liu)(liu)向从(cong)A1-C2–B3入地(di)。

    经测验(yan),断开两头(tou)的接地(di)线(xian),电(dian)(dian)缆(lan)结尾金属护套的感(gan)应(ying)电(dian)(dian)压(ya)(ya)为2V(测验(yan)时该电(dian)(dian)缆(lan)载(zai)流量为44A)。护套中环流实验(yan)成果(guo)见表2 。真(zhen)实到达图(tu)2 抱(bao)负情况(kuang)的可能性很小,因(yin)3 相(xiang)单芯电(dian)(dian)缆(lan)长(zhang)(zhang)度每段(duan)电(dian)(dian)缆(lan)长(zhang)(zhang)度不行能肯定持(chi)平(ping)。故(gu)还会有不平(ping)衡感(gan)应(ying)电(dian)(dian)压(ya)(ya),构成电(dian)(dian)流流过护套。改(gai)造后电(dian)(dian)缆(lan)线(xian)路的金属护套彻底到达穿插换(huan)位意图(tu)。

     

     

    定论

    同轴(zhou)电(dian)(dian)(dian)(dian)缆(lan)(lan)表里导体(ti)和(he)送、受电(dian)(dian)(dian)(dian)端接(jie)(jie)(jie)(jie)点(dian)接(jie)(jie)(jie)(jie)线(xian)过错将(jiang)导致护套穿插(cha)(cha)换(huan)(huan)位(wei)失(shi)利。在(zai)装(zhuang)置(zhi)穿插(cha)(cha)互(hu)联(lian)换(huan)(huan)位(wei)接(jie)(jie)(jie)(jie)地(di)(di)(di)箱(xiang)之(zhi)前有必(bi)要共同约好(hao)接(jie)(jie)(jie)(jie)线(xian)办法,同一组电(dian)(dian)(dian)(dian)缆(lan)(lan)金(jin)属护套穿插(cha)(cha)互(hu)联(lian)接(jie)(jie)(jie)(jie)地(di)(di)(di)中接(jie)(jie)(jie)(jie)头办法有必(bi)要共同。穿插(cha)(cha)互(hu)联(lian)换(huan)(huan)位(wei)过程(cheng)中,任何(he)接(jie)(jie)(jie)(jie)点(dian)过错将(jiang)导致护套穿插(cha)(cha)换(huan)(huan)位(wei)失(shi)利。在(zai)装(zhuang)置(zhi)同轴(zhou)电(dian)(dian)(dian)(dian)缆(lan)(lan)时(shi)(shi)(shi)同一组电(dian)(dian)(dian)(dian)缆(lan)(lan)金(jin)属护套穿插(cha)(cha)互(hu)联(lian)接(jie)(jie)(jie)(jie)地(di)(di)(di)中各(ge)接(jie)(jie)(jie)(jie)头的换(huan)(huan)位(wei)箱(xiang)A、B、C 连板相有必(bi)要在(zai)相同方位(wei)。护套感应环(huan)流(liu)实(shi)验(yan)可有用地(di)(di)(di)查(cha)验(yan)护套穿插(cha)(cha)换(huan)(huan)位(wei)情况。有必(bi)要加强(qiang)电(dian)(dian)(dian)(dian)缆(lan)(lan)巡视(shi),如发现同轴(zhou)电(dian)(dian)(dian)(dian)缆(lan)(lan)电(dian)(dian)(dian)(dian)流(liu)反常,应查(cha)明原因并及时(shi)(shi)(shi)纠正。要注重高压(ya)单芯电(dian)(dian)(dian)(dian)缆(lan)(lan)的接(jie)(jie)(jie)(jie)地(di)(di)(di)装(zhuang)置(zhi),应周(zhou)期性(xing)地(di)(di)(di)测(ce)验(yan)其(qi)环(huan)流(liu),以便及时(shi)(shi)(shi)发现和(he)处理缺(que)点(dian),削(xue)减线(xian)损和(he)进步供电(dian)(dian)(dian)(dian)牢靠率。

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