电(Dian)梯(Ti)监(Jian)控(Kong)抗(Kang)干(Gan)扰(Rao)技(Ji)术(Shu)原(Yuan)理(Li)及(Ji)要(Yao)点(Dian)
基(Ji)于(Yu)电(Dian)梯(Ti)视(Shi)频(Pin)监(Jian)控(Kong)干(Gan)扰(Rao)产(Chan)生(Sheng)原(Yuan)理(Li)的(De)研(Yan)究(Jiu)成(Cheng)果(Guo),(?)对(Dui)干(Gan)扰(Rao)形(Xing)成(Cheng)和(He)抗(Kang)干(Gan)扰(Rao)技(Ji)术(Shu)进(Jin)行(Xing)了(Liao)合(He)理(Li)的(De)分(Fen)析(Xi),(?)取(Qu)得(De)了(Liao)理(Li)论(Lun)和(He)实(Shi)践(Jian)的(De)统(Tong)一(Yi)结(Jie)果(Guo),(?)为(Wei)电(Dian)梯(Ti)监(Jian)控(Kong)系(Xi)统(Tong)的(De)设(She)计(Ji)和(He)建(Jian)设(She)提(Ti)供(Gong)了(Liao)一(Yi)些(Xie)更(Geng)加(Jia)实(Shi)用(Yong)的(De)抗(Kang)干(Gan)扰(Rao)技(Ji)术(Shu)措(Cuo)施(Shi)。(?)本(Ben)文(Wen)仅(Jin)论(Lun)述(Shu)电(Dian)梯(Ti)监(Jian)控(Kong)工(Gong)程(Cheng)中(Zhong)同(Tong)轴(Zhou)视(Shi)频(Pin)传(Chuan)输(Shu)的(De)抗(Kang)干(Gan)扰(Rao)技(Ji)术(Shu),(?)供(Gong)设(She)计(Ji)和(He)施(Shi)工(Gong)参(Can)考(Kao)。(?)
在(Zai)闭(Bi)路(Lu)监(Jian)控(Kong)工(Gong)程(Cheng)中(Zhong),(?)电(Dian)梯(Ti)监(Jian)控(Kong)视(Shi)频(Pin)干(Gan)扰(Rao)问(Wen)题(Ti)一(Yi)直(Zhi)是(Shi)最(Zui)常(Chang)见(Jian)、(?)最(Zui)难(Nan)处(Chu)理(Li)和(He)最(Zui)受(Shou)关(Guan)注(Zhu)的(De)问(Wen)题(Ti)之(Zhi)一(Yi)。(?)本(Ben)文(Wen)指(Zhi)出(Chu),(?)只(Zhi)要(Yao)掌(Zhang)握(Wo)了(Liao)干(Gan)扰(Rao)产(Chan)生(Sheng)的(De)原(Yuan)理(Li),(?)电(Dian)梯(Ti)抗(Kang)干(Gan)扰(Rao)的(De)工(Gong)程(Cheng)问(Wen)题(Ti)就(Jiu)能(Neng)得(De)到(Dao)解(Jie)决(Jue)。(?)
首(Shou)先(Xian),(?)掌(Zhang)握(Wo)常(Chang)用(Yong)同(Tong)轴(Zhou)电(Dian)缆(Lan)的(De)类(Lei)型(Xing)和(He)特(Te)点(Dian)
1.考(Kao)虑(Lu)传(Chuan)输(Shu)衰(Shuai)减(Jian):当(Dang)地(Di)板(Ban)很(Hen)高(Gao)且(Qie)远(Yuan)离(Li)监(Jian)控(Kong)中(Zhong)心(Xin)时(Shi),(?)应(Ying)仔(Zi)细(Xi)考(Kao)虑(Lu)传(Chuan)输(Shu)衰(Shuai)减(Jian)问(Wen)题(Ti)。(?)在(Zai)选(Xuan)择(Ze)电(Dian)缆(Lan)时(Shi),(?)大(Da)家(Jia)都(Du)知(Zhi)道(Dao)粗(Cu)电(Dian)缆(Lan)比(Bi)细(Xi)电(Dian)缆(Lan)好(Hao),(?)但(Dan)也(Ye)应(Ying)该(Gai)明(Ming)白(Bai)sywv物(Wu)理(Li)泡(Pao)沫(Mo)电(Dian)缆(Lan)比(Bi)实(Shi)心(Xin)syv电(Dian)缆(Lan)好(Hao),(?)高(Gao)档(Dang)电(Dian)缆(Lan)比(Bi)低(Di)档(Dang)电(Dian)缆(Lan)好(Hao),(?)铜(Tong)芯(Xin)电(Dian)缆(Lan)比(Bi)“(?)铜(Tong)包(Bao)钢(Gang)”(?)电(Dian)缆(Lan)好(Hao),(?)铜(Tong)编(Bian)织(Zhi)网(Wang)比(Bi)铝(Lu)镁(Mei)合(He)金(Jin)编(Bian)织(Zhi)网(Wang)好(Hao)。(?)
2.注(Zhu)意(Yi)高(Gao)频(Pin)衰(Shuai)减(Jian):低(Di)频(Pin)成(Cheng)分(Fen)的(De)亮(Liang)度(Du)/对(Dui)比(Bi)度(Du)衰(Shuai)减(Jian)很(Hen)容(Rong)易(Yi)找(Zhao)到(Dao)和(He)解(Jie)决(Jue)。(?)电(Dian)缆(Lan)最(Zui)重(Zhong)要(Yao)的(De)传(Chuan)输(Shu)特(Te)性(Xing)是(Shi)频(Pin)率(Lu)越(Yue)高(Gao),(?)衰(Shuai)减(Jian)越(Yue)大(Da)。(?)高(Gao)频(Pin)衰(Shuai)减(Jian)主(Zhu)要(Yao)影(Ying)响(Xiang)清(Qing)晰(Xi)度(Du)和(He)分(Fen)辨(Bian)率(Lu)。(?)应(Ying)特(Te)别(Bie)注(Zhu)意(Yi)总(Zong)结(Jie)图(Tu)像(Xiang)质(Zhi)量(Liang)的(De)观(Guan)察(Cha)方(Fang)法(Fa)。(?)电(Dian)缆(Lan)在(Zai)这(Zhe)方(Fang)面(Mian)的(De)特(Te)点(Dian)和(He)规(Gui)律(Lu)是(Shi):粗(Cu)电(Dian)缆(Lan)比(Bi)细(Xi)电(Dian)缆(Lan)好(Hao),(?)发(Fa)泡(Pao)比(Bi)实(Shi)心(Xin)电(Dian)缆(Lan)好(Hao),(?)但(Dan)同(Tong)类(Lei)型(Xing)的(De)“(?)高(Gao)低(Di)编(Bian)织(Zhi)高(Gao)频(Pin)衰(Shuai)减(Jian)相(Xiang)同(Tong)”(?);(?)
3.考(Kao)虑(Lu)电(Dian)缆(Lan)寿(Shou)命(Ming):软(Ruan)电(Dian)缆(Lan)优(You)于(Yu)普(Pu)通(Tong)电(Dian)缆(Lan),(?)细(Xi)电(Dian)缆(Lan)优(You)于(Yu)粗(Cu)电(Dian)缆(Lan);(?)还(Huan)有(You)一(Yi)个(Ge)最(Zui)容(Rong)易(Yi)被(Bei)忽(Hu)略(Lue)的(De)问(Wen)题(Ti):电(Dian)缆(Lan)各(Ge)层(Ceng)之(Zhi)间(Jian)的(De)粘(Zhan)合(He)力(Li),(?)即(Ji)当(Dang)电(Dian)缆(Lan)各(Ge)层(Ceng)在(Zai)相(Xiang)反(Fan)的(De)纵(Zong)向(Xiang)方(Fang)向(Xiang)受(Shou)到(Dao)应(Ying)力(Li)时(Shi)是(Shi)否(Fou)会(Hui)有(You)相(Xiang)对(Dui)滑(Hua)动(Dong)。(?)高(Gao)层(Ceng)电(Dian)梯(Ti)的(De)电(Dian)缆(Lan)长(Chang)度(Du)可(Ke)达(Da)100米(Mi),(?)电(Dian)缆(Lan)外(Wai)护(Hu)套(Tao)固(Gu)定(Ding)在(Zai)随(Sui)行(Xing)电(Dian)缆(Lan)上(Shang)。(?)这(Zhe)是(Shi)一(Yi)种(Zhong)“(?)软(Ruan)固(Gu)定(Ding)”(?),(?)不(Bu)允(Yun)许(Xu)电(Dian)缆(Lan)在(Zai)固(Gu)定(Ding)过(Guo)程(Cheng)中(Zhong)变(Bian)形(Xing)(破(Po)坏(Huai)同(Tong)轴(Zhou)度(Du))。(?)结(Jie)果(Guo),(?)电(Dian)缆(Lan)内(Nei)层(Ceng)在(Zai)重(Zhong)力(Li)的(De)作(Zuo)用(Yong)下(Xia)会(Hui)逐(Zhu)渐(Jian)“(?)滑(Hua)下(Xia)”(?),(?)并(Bing)慢(Man)慢(Man)破(Po)坏(Huai)编(Bian)织(Zhi)的(De)网(Wang)络(Luo)或(Huo)芯(Xin)线(Xian),(?)表(Biao)明(Ming)信(Xin)号(Hao)逐(Zhu)渐(Jian)减(Jian)弱(Ruo),(?)干(Gan)扰(Rao)增(Zeng)加(Jia)。(?)目(Mu)前(Qian),(?)这(Zhe)种(Zhong)电(Dian)缆(Lan)没(Mei)有(You)技(Ji)术(Shu)标(Biao)准(Zhun)。(?)简(Jian)单(Dan)的(De)检(Jian)查(Cha)方(Fang)法(Fa)是(Shi)取(Qu)一(Yi)根(Gen)米(Mi)长(Chang)的(De)电(Dian)缆(Lan),(?)剥(Bao)去(Qu)一(Yi)端(Duan)的(De)每(Mei)一(Yi)层(Ceng),(?)一(Yi)个(Ge)人(Ren)用(Yong)手(Shou)握(Wo)住(Zhu)电(Dian)缆(Lan)的(De)两(Liang)端(Duan),(?)另(Ling)一(Yi)个(Ge)人(Ren)用(Yong)钳(Qian)子(Zi)拉(La)动(Dong)电(Dian)缆(Lan)的(De)内(Nei)层(Ceng):依(Yi)次(Ci)拉(La)动(Dong)芯(Xin)线(Xian)、(?)绝(Jue)缘(Yuan)层(Ceng)和(He)编(Bian)织(Zhi)网(Wang),(?)体(Ti)验(Yan)附(Fu)着(Zhuo)力(Li)的(De)大(Da)小(Xiao),(?)做(Zuo)出(Chu)合(He)理(Li)的(De)估(Gu)计(Ji),(?)尽(Jin)量(Liang)不(Bu)要(Yao)选(Xuan)择(Ze)附(Fu)着(Zhuo)力(Li)差(Cha)、(?)容(Rong)易(Yi)滑(Hua)动(Dong)的(De)。(?)许(Xu)多(Duo)具(Ju)有(You)这(Zhe)种(Zhong)性(Xing)能(Neng)的(De)电(Dian)缆(Lan)不(Bu)是(Shi)很(Hen)好(Hao),(?)应(Ying)该(Gai)仔(Zi)细(Xi)选(Xuan)择(Ze)。(?)
二(?).干(Gan)扰(Rao)产(Chan)生(Sheng)原(Yuan)理(Li)简(Jian)介(Jie)
1.诸(Zhu)如(Ru)电(Dian)力(Li)电(Dian)缆(Lan)、(?)照(Zhao)明(Ming)电(Dian)缆(Lan)、(?)风(Feng)扇(Shan)电(Dian)缆(Lan)、(?)控(Kong)制(Zhi)电(Dian)缆(Lan)和(He)通(Tong)信(Xin)电(Dian)缆(Lan)的(De)电(Dian)缆(Lan)通(Tong)常(Chang)布(Bu)置(Zhi)在(Zai)电(Dian)梯(Ti)井(Jing)中(Zhong)。(?)各(Ge)种(Zhong)电(Dian)缆(Lan)都(Du)会(Hui)产(Chan)生(Sheng)电(Dian)磁(Ci)辐(Fu)射(She)。(?)与(Yu)天(Tian)线(Xian)接(Jie)收(Shou)原(Yuan)理(Li)相(Xiang)同(Tong),(?)同(Tong)轴(Zhou)电(Dian)缆(Lan)也(Ye)将(Jiang)“(?)接(Jie)收(Shou)”(?)这(Zhe)些(Xie)干(Gan)扰(Rao),(?)即(Ji)干(Gan)扰(Rao)电(Dian)磁(Ci)场(Chang)在(Zai)电(Dian)缆(Lan)上(Shang)产(Chan)生(Sheng)干(Gan)扰(Rao)感(Gan)应(Ying)电(Dian)流(Liu),(?)这(Zhe)种(Zhong)干(Gan)扰(Rao)感(Gan)应(Ying)电(Dian)流(Liu)还(Huan)将(Jiang)在(Zai)电(Dian)缆(Lan)外(Wai)导(Dao)体(Ti)(编(Bian)织(Zhi)网(Wang))的(De)纵(Zong)向(Xiang)电(Dian)阻(Zu)上(Shang)产(Chan)生(Sheng)干(Gan)扰(Rao)感(Gan)应(Ying)电(Dian)压(Ya)(电(Dian)动(Dong)势(Shi)),(?)电(Dian)缆(Lan)外(Wai)导(Dao)体(Ti)只(Zhi)是(Shi)串(Chuan)联(Lian)在(Zai)视(Shi)频(Pin)信(Xin)号(Hao)传(Chuan)输(Shu)回(Hui)路(Lu)的(De)“(?)长(Chang)接(Jie)地(Di)线(Xian)”(?)中(Zhong)形(Xing)成(Cheng)干(Gan)扰(Rao);(?)
2.更(Geng)重(Zhong)要(Yao)的(De)是(Shi),(?)这(Zhe)些(Xie)附(Fu)带(Dai)的(De)电(Dian)缆(Lan)与(Yu)视(Shi)频(Pin)电(Dian)缆(Lan)平(Ping)行(Xing),(?)并(Bing)在(Zai)近(Jin)距(Ju)离(Li)捆(Kun)绑(Bang)在(Zai)一(Yi)起(Qi)。(?)这(Zhe)形(Xing)成(Cheng)了(Liao)接(Jie)近(Jin)“(?)最(Zui)佳(Jia)和(He)最(Zui)有(You)效(Xiao)”(?)干(Gan)扰(Rao)的(De)耦(Ou)合(He)关(Guan)系(Xi)。(?)在(Zai)一(Yi)般(Ban)工(Gong)程(Cheng)中(Zhong),(?)可(Ke)以(Yi)采(Cai)用(Yong)通(Tong)过(Guo)金(Jin)属(Shu)管(Guan)或(Huo)金(Jin)属(Shu)槽(Cao)屏(Ping)蔽(Bi)干(Gan)扰(Rao)的(De)方(Fang)法(Fa),(?)但(Dan)在(Zai)电(Dian)梯(Ti)随(Sui)动(Dong)环(Huan)境(Jing)中(Zhong),(?)这(Zhe)种(Zhong)方(Fang)法(Fa)无(Wu)能(Neng)为(Wei)力(Li)。(?)因(Yin)此(Ci),(?)在(Zai)电(Dian)梯(Ti)环(Huan)境(Jing)中(Zhong)很(Hen)难(Nan)抵(Di)抗(Kang)干(Gan)扰(Rao),(?)只(Zhi)能(Neng)选(Xuan)择(Ze)更(Geng)好(Hao)的(De)设(She)计(Ji)和(He)施(Shi)工(Gong)方(Fang)法(Fa)。(?)
3.了(Liao)解(Jie)干(Gan)扰(Rao)的(De)基(Ji)本(Ben)原(Yuan)理(Li)对(Dui)完(Wan)善(Shan)抗(Kang)干(Gan)扰(Rao)设(She)计(Ji)和(He)施(Shi)工(Gong)至(Zhi)关(Guan)重(Zhong)要(Yao)。(?)
三(San)、(?)常(Chang)用(Yong)铜(Tong)轴(Zhou)电(Dian)缆(Lan)传(Chuan)输(Shu)方(Fang)案(An)的(De)抗(Kang)干(Gan)扰(Rao)措(Cuo)施(Shi)
1.常(Chang)用(Yong)铜(Tong)轴(Zhou)电(Dian)缆(Lan):无(Wu)论(Lun)是(Shi)多(Duo)层(Ceng)高(Gao)编(Bian)织(Zhi)铜(Tong)网(Wang)电(Dian)缆(Lan)、(?)“(?)铝(Lu)箔(Bo)-编(Bian)织(Zhi)网(Wang)”(?)双(Shuang)屏(Ping)蔽(Bi)电(Dian)缆(Lan),(?)还(Huan)是(Shi)“(?)铝(Lu)箔(Bo)-编(Bian)织(Zhi)网(Wang)-铝(Lu)箔(Bo)-编(Bian)织(Zhi)网(Wang)”(?)四(Si)屏(Ping)蔽(Bi)电(Dian)缆(Lan),(?)都(Du)属(Shu)于(Yu)屏(Ping)蔽(Bi)层(Ceng)。(?)干(Gan)扰(Rao)感(Gan)应(Ying)电(Dian)压(Ya)直(Zhi)接(Jie)串(Chuan)联(Lian)在(Zai)视(Shi)频(Pin)信(Xin)号(Hao)传(Chuan)输(Shu)环(Huan)路(Lu)中(Zhong)。(?)只(Zhi)有(You)多(Duo)层(Ceng)高(Gao)压(Ya)电(Dian)缆(Lan)的(De)外(Wai)导(Dao)体(Ti)电(Dian)阻(Zu)较(Jiao)小(Xiao),(?)形(Xing)成(Cheng)的(De)干(Gan)扰(Rao)感(Gan)应(Ying)电(Dian)压(Ya)相(Xiang)对(Dui)较(Jiao)低(Di)。(?)这(Zhe)对(Dui)于(Yu)低(Di)频(Pin)电(Dian)源(Yuan)干(Gan)扰(Rao)、(?)电(Dian)机(Ji)电(Dian)火(Huo)花(Hua)干(Gan)扰(Rao)等(Deng)有(You)一(Yi)定(Ding)的(De)效(Xiao)果(Guo)(干(Gan)扰(Rao)在(Zai)几(Ji)十(Shi)千(Qian)赫(He)兹(Zi)以(Yi)下(Xia))。(?)但(Dan)是(Shi),(?)对(Dui)于(Yu)高(Gao)频(Pin)干(Gan)扰(Rao),(?)由(You)于(Yu)“(?)趋(Qu)肤(Fu)效(Xiao)应(Ying)”(?),(?)高(Gao)频(Pin)阻(Zu)抗(Kang)与(Yu)低(Di)编(Bian)织(Zhi)电(Dian)缆(Lan)相(Xiang)同(Tong),(?)抗(Kang)干(Gan)扰(Rao)效(Xiao)果(Guo)基(Ji)本(Ben)相(Xiang)同(Tong)。(?)因(Yin)此(Ci),(?)我(Wo)们(Men)应(Ying)该(Gai)清(Qing)楚(Chu)地(Di)看(Kan)到(Dao),(?)高(Gao)压(Ya)电(Dian)缆(Lan)只(Zhi)能(Neng)适(Shi)当(Dang)地(Di)减(Jian)少(Shao)低(Di)频(Pin)干(Gan)扰(Rao),(?)而(?)对(Dui)于(Yu)防(Fang)止(Zhi)强(Qiang)干(Gan)扰(Rao)和(He)高(Gao)频(Pin)干(Gan)扰(Rao),(?)我(Wo)们(Men)仍(Reng)然(Ran)无(Wu)能(Neng)为(Wei)力(Li)。(?)
2.电(Dian)梯(Ti)布(Bu)线(Xian)的(De)抗(Kang)干(Gan)扰(Rao)措(Cuo)施(Shi):
(1)视(Shi)频(Pin)电(Dian)缆(Lan)离(Li)开(Kai)电(Dian)梯(Ti)井(Jing)道(Dao)的(De)位(Wei)置(Zhi)选(Xuan)择(Ze):理(Li)想(Xiang)的(De)选(Xuan)择(Ze)应(Ying)该(Gai)是(Shi)在(Zai)井(Jing)道(Dao)的(De)中(Zhong)间(Jian),(?)因(Yin)为(Wei)井(Jing)道(Dao)中(Zhong)伴(Ban)随(Sui)的(De)视(Shi)频(Pin)电(Dian)缆(Lan)的(De)长(Chang)度(Du)仅(Jin)略(Lue)大(Da)于(Yu)井(Jing)道(Dao)深(Shen)度(Du)的(De)一(Yi)半(Ban),(?)最(Zui)短(Duan),(?)自(Zi)然(Ran)引(Yin)入(Ru)的(De)干(Gan)扰(Rao)最(Zui)小(Xiao);(?)但(Dan)是(Shi),(?)这(Zhe)种(Zhong)资(Zi)格(Ge)要(Yao)求(Qiu)在(Zai)工(Gong)程(Cheng)中(Zhong)只(Zhi)能(Neng)根(Gen)据(Ju)情(Qing)况(Kuang)来(Lai)获(Huo)得(De),(?)实(Shi)际(Ji)工(Gong)程(Cheng)可(Ke)能(Neng)是(Shi)不(Bu)允(Yun)许(Xu)的(De)。(?)
(2)过(Guo)去(Qu),(?)在(Zai)不(Bu)理(Li)解(Jie)原(Yuan)理(Li)的(De)情(Qing)况(Kuang)下(Xia),(?)大(Da)多(Duo)数(Shu)出(Chu)线(Xian)都(Du)与(Yu)其(Qi)他(Ta)随(Sui)行(Xing)电(Dian)缆(Lan)一(Yi)起(Qi)走(Zou)出(Chu)电(Dian)缆(Lan)井(Jing)的(De)顶(Ding)部(Bu)或(Huo)底(Di)部(Bu)。(?)在(Zai)这(Zhe)种(Zhong)情(Qing)况(Kuang)下(Xia),(?)考(Kao)虑(Lu)到(Dao)只(Zhi)有(You)一(Yi)半(Ban)的(De)电(Dian)缆(Lan)相(Xiang)互(Hu)移(Yi)动(Dong),(?)而(?)另(Ling)一(Yi)半(Ban)只(Zhi)是(Shi)固(Gu)定(Ding)的(De)延(Yan)伸(Shen)连(Lian)接(Jie)而(?)不(Bu)移(Yi)动(Dong),(?)我(Wo)们(Men)称(Cheng)这(Zhe)部(Bu)分(Fen)为(Wei)“(?)固(Gu)定(Ding)电(Dian)缆(Lan)”(?);(?)这(Zhe)提(Ti)供(Gong)了(Liao)一(Yi)种(Zhong)可(Ke)能(Neng)性(Xing):一(Yi)半(Ban)的(De)移(Yi)动(Dong)电(Dian)缆(Lan)只(Zhi)能(Neng)与(Yu)其(Qi)他(Ta)移(Yi)动(Dong)电(Dian)缆(Lan)捆(Kun)绑(Bang)在(Zai)一(Yi)起(Qi),(?)以(Yi)运(Yun)行(Xing)电(Dian)缆(Lan)。(?)然(Ran)而(?),(?)固(Gu)定(Ding)电(Dian)缆(Lan)的(De)另(Ling)一(Yi)半(Ban)可(Ke)以(Yi)与(Yu)随(Sui)附(Fu)电(Dian)缆(Lan)分(Fen)开(Kai)布(Bu)线(Xian)。(?)更(Geng)有(You)效(Xiao)的(De)方(Fang)法(Fa)是(Shi)将(Jiang)视(Shi)频(Pin)电(Dian)缆(Lan)垂(Chui)直(Zhi)靠(Kao)近(Jin)电(Dian)梯(Ti)井(Jing)的(De)井(Jing)壁(Bi),(?)并(Bing)将(Jiang)这(Zhe)部(Bu)分(Fen)电(Dian)缆(Lan)穿(Chuan)过(Guo)金(Jin)属(Shu)管(Guan)或(Huo)金(Jin)属(Shu)槽(Cao),(?)以(Yi)屏(Ping)蔽(Bi)干(Gan)扰(Rao)对(Dui)这(Zhe)部(Bu)分(Fen)电(Dian)缆(Lan)的(De)影(Ying)响(Xiang)。(?)
(3)当(Dang)行(Xing)走(Zou)部(Bu)分(Fen)的(De)视(Shi)频(Pin)电(Dian)缆(Lan)与(Yu)其(Qi)他(Ta)行(Xing)走(Zou)电(Dian)缆(Lan)捆(Kun)绑(Bang)时(Shi),(?)设(She)计(Ji)人(Ren)员(Yuan)应(Ying)充(Chong)分(Fen)了(Liao)解(Jie)其(Qi)他(Ta)行(Xing)走(Zou)电(Dian)缆(Lan)的(De)结(Jie)构(Gou)和(He)分(Fen)布(Bu)。(?)捆(Kun)绑(Bang)时(Shi),(?)视(Shi)频(Pin)电(Dian)缆(Lan)应(Ying)尽(Jin)可(Ke)能(Neng)远(Yuan)离(Li)大(Da)电(Dian)流(Liu)、(?)高(Gao)频(Pin)电(Dian)缆(Lan),(?)捆(Kun)绑(Bang)在(Zai)小(Xiao)电(Dian)流(Liu)、(?)低(Di)频(Pin)电(Dian)缆(Lan)附(Fu)近(Jin)。(?)在(Zai)这(Zhe)里(Li),(?)即(Ji)使(Shi)有(You)1厘(Li)米(Mi)的(De)选(Xuan)择(Ze),(?)我(Wo)们(Men)也(Ye)可(Ke)能(Neng)不(Bu)得(De)不(Bu)为(Wei)之(Zhi)奋(Fen)斗(Dou),(?)因(Yin)为(Wei)干(Gan)扰(Rao)影(Ying)响(Xiang)至(Zhi)少(Shao)与(Yu)距(Ju)离(Li)的(De)平(Ping)方(Fang)成(Cheng)反(Fan)比(Bi)。(?)
(4)摄(She)像(Xiang)机(Ji)金(Jin)属(Shu)外(Wai)壳(Ke)、(?)数(Shu)控(Kong)头(Tou)外(Wai)壳(Ke)、(?)同(Tong)轴(Zhou)电(Dian)缆(Lan)外(Wai)导(Dao)体(Ti)等(Deng)视(Shi)频(Pin)信(Xin)号(Hao)“(?)接(Jie)地(Di)”(?),(?)以(Yi)及(Ji)电(Dian)梯(Ti)轿(Jiao)厢(Xiang)、(?)导(Dao)轨(Gui)等(Deng)。(?)为(Wei)了(Liao)绝(Jue)缘(Yuan),(?)安(An)装(Zhuang)摄(She)像(Xiang)机(Ji)时(Shi)应(Ying)特(Te)别(Bie)注(Zhu)意(Yi)这(Zhe)一(Yi)点(Dian)。(?)
⑤(?)摄(She)像(Xiang)机(Ji)电(Dian)源(Yuan)应(Ying)首(Shou)选(Xuan)集(Ji)中(Zhong)DC电(Dian)源(Yuan),(?)其(Qi)次(Ci)是(Shi)汽(Qi)车(Che)照(Zhao)明(Ming)电(Dian)源(Yuan),(?)而(?)不(Bu)是(Shi)电(Dian)源(Yuan)。(?)
⑥(?)对(Dui)于(Yu)电(Dian)源(Yuan)、(?)控(Kong)制(Zhi)等(Deng)监(Jian)控(Kong)电(Dian)缆(Lan),(?)尽(Jin)量(Liang)使(Shi)用(Yong)屏(Ping)蔽(Bi)电(Dian)缆(Lan),(?)防(Fang)止(Zhi)干(Gan)扰(Rao)信(Xin)号(Hao)泄(Xie)漏(Lou)。(?)
⑦(?)对(Dui)于(Yu)从(Cong)电(Dian)梯(Ti)井(Jing)出(Chu)口(Kou)到(Dao)控(Kong)制(Zhi)中(Zhong)心(Xin)的(De)视(Shi)频(Pin)电(Dian)缆(Lan),(?)应(Ying)使(Shi)用(Yong)金(Jin)属(Shu)管(Guan)或(Huo)金(Jin)属(Shu)槽(Cao)来(Lai)屏(Ping)蔽(Bi)沿(Yan)途(Tu)环(Huan)境(Jing)干(Gan)扰(Rao)对(Dui)电(Dian)缆(Lan)这(Zhe)一(Yi)部(Bu)分(Fen)的(De)影(Ying)响(Xiang),(?)并(Bing)注(Zhu)意(Yi)屏(Ping)蔽(Bi)这(Zhe)一(Yi)部(Bu)分(Fen)与(Yu)电(Dian)梯(Ti)井(Jing)屏(Ping)蔽(Bi)之(Zhi)间(Jian)的(De)电(Dian)气(Qi)连(Lian)接(Jie)。(?)
四(Si)、(?)抗(Kang)干(Gan)扰(Rao)同(Tong)轴(Zhou)电(Dian)缆(Lan)的(De)应(Ying)用(Yong)
1.抗(Kang)干(Gan)扰(Rao)同(Tong)轴(Zhou)电(Dian)缆(Lan)是(Shi)一(Yi)种(Zhong)“(?)双(Shuang)绝(Jue)缘(Yuan)双(Shuang)屏(Ping)蔽(Bi)同(Tong)轴(Zhou)电(Dian)缆(Lan)”(?)。(?)芯(Xin)线(Xian)、(?)绝(Jue)缘(Yuan)层(Ceng)和(He)屏(Ping)蔽(Bi)层(Ceng)仍(Reng)然(Ran)是(Shi)标(Biao)准(Zhun)的(De)75欧(Ou)姆(Mu)电(Dian)缆(Lan),(?)没(Mei)有(You)区(Qu)别(Bie)。(?)不(Bu)同(Tong)之(Zhi)处(Chu)在(Zai)于(Yu),(?)将(Jiang)第(Di)二(?)绝(Jue)缘(Yuan)层(Ceng)和(He)第(Di)二(?)屏(Ping)蔽(Bi)层(Ceng)添(Tian)加(Jia)到(Dao)原(Yuan)始(Shi)屏(Ping)蔽(Bi)层(Ceng),(?)并(Bing)将(Jiang)护(Hu)套(Tao)添(Tian)加(Jia)到(Dao)外(Wai)部(Bu)。(?)从(Cong)以(Yi)上(Shang)对(Dui)干(Gan)扰(Rao)产(Chan)生(Sheng)原(Yuan)理(Li)的(De)分(Fen)析(Xi)可(Ke)知(Zhi),(?)传(Chuan)统(Tong)同(Tong)轴(Zhou)电(Dian)缆(Lan)外(Wai)层(Ceng)干(Gan)扰(Rao)产(Chan)生(Sheng)的(De)感(Gan)应(Ying)电(Dian)压(Ya)串(Chuan)联(Lian)在(Zai)视(Shi)频(Pin)信(Xin)号(Hao)传(Chuan)输(Shu)回(Hui)路(Lu)的(De)“(?)长(Chang)接(Jie)地(Di)线(Xian)”(?)中(Zhong),(?)从(Cong)而(?)形(Xing)成(Cheng)干(Gan)扰(Rao)。(?)然(Ran)而(?),(?)随(Sui)着(Zhuo)抗(Kang)干(Gan)扰(Rao)同(Tong)轴(Zhou)电(Dian)缆(Lan)的(De)采(Cai)用(Yong),(?)情(Qing)况(Kuang)发(Fa)生(Sheng)了(Liao)质(Zhi)的(De)变(Bian)化(Hua):干(Gan)扰(Rao)感(Gan)应(Ying)电(Dian)压(Ya)只(Zhi)能(Neng)形(Xing)成(Cheng)在(Zai)“(?)第(Di)二(?)屏(Ping)蔽(Bi)层(Ceng)”(?)上(Shang),(?)内(Nei)部(Bu)的(De)“(?)第(Di)二(?)绝(Jue)缘(Yuan)层(Ceng)”(?)将(Jiang)其(Qi)与(Yu)视(Shi)频(Pin)信(Xin)号(Hao)传(Chuan)输(Shu)电(Dian)路(Lu)的(De)“(?)长(Chang)接(Jie)地(Di)线(Xian)”(?)绝(Jue)缘(Yuan),(?)从(Cong)而(?)消(Xiao)除(Chu)了(Liao)视(Shi)频(Pin)信(Xin)号(Hao)传(Chuan)输(Shu)电(Dian)路(Lu)的(De)干(Gan)扰(Rao),(?)达(Da)到(Dao)了(Liao)抗(Kang)干(Gan)扰(Rao)的(De)目(Mu)的(De)。(?)
2.这(Zhe)种(Zhong)抗(Kang)干(Gan)扰(Rao)电(Dian)缆(Lan)对(Dui)于(Yu)超(Chao)强(Qiang)低(Di)频(Pin)电(Dian)源(Yuan)干(Gan)扰(Rao)、(?)电(Dian)机(Ji)火(Huo)花(Hua)干(Gan)扰(Rao)、(?)变(Bian)频(Pin)电(Dian)机(Ji)干(Gan)扰(Rao)、(?)控(Kong)制(Zhi)信(Xin)号(Hao)干(Gan)扰(Rao)等(Deng)几(Ji)十(Shi)千(Qian)赫(He)兹(Zi)以(Yi)下(Xia)的(De)干(Gan)扰(Rao)具(Ju)有(You)优(You)异(Yi)的(De)抗(Kang)干(Gan)扰(Rao)性(Xing)能(Neng)。(?)在(Zai)电(Dian)梯(Ti)环(Huan)境(Jing)中(Zhong)。(?)
3.在(Zai)长(Chang)输(Shu)线(Xian)路(Lu)工(Gong)程(Cheng)设(She)计(Ji)中(Zhong),(?)采(Cai)用(Yong)“(?)双(Shuang)绝(Jue)缘(Yuan)双(Shuang)屏(Ping)蔽(Bi)同(Tong)轴(Zhou)电(Dian)缆(Lan)”(?)后(Hou),(?)也(Ye)可(Ke)以(Yi)大(Da)大(Da)简(Jian)化(Hua)传(Chuan)统(Tong)工(Gong)程(Cheng)中(Zhong)的(De)一(Yi)些(Xie)抗(Kang)干(Gan)扰(Rao)措(Cuo)施(Shi),(?)有(You)效(Xiao)降(Jiang)低(Di)工(Gong)程(Cheng)总(Zong)成(Cheng)本(Ben)。(?)
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