TSX3721101產(chǎn)品說明:
TSX3721101
廈門卡庫電氣有限公司
地 址: 廈門湖里區(qū)枋湖西一里22號1302室
聯(lián)系人:嚴(yán)小姐
T:0592-5709823
P:18030229052
F:0592-5709828
——————廈門卡庫電氣有限公司———————————
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————————廈門卡庫電氣有限公司———————————————
PLC技術(shù)及工作原理 PLC(PowerLineCommunication)即電力線通信是指利用電力線傳輸數(shù)據(jù)和話音信號的一種通信方式。迄今,PLC技術(shù)已經(jīng)有幾十年的發(fā)展歷史,在技術(shù)發(fā)展的各個階段,電力系統(tǒng)已經(jīng)得到了不同的應(yīng)用。在高壓輸電網(wǎng)(35kV以上)、中壓輸電網(wǎng)(10kV-35kV)以及低壓(10kV以下)的各個領(lǐng)域,數(shù)據(jù)傳輸?shù)耐ㄓ崝?shù)率不斷提高?,F(xiàn)階段,在低壓配電網(wǎng)上傳輸數(shù)率已由1Mbps發(fā)展到2Mbps、14Mbps、24Mbps、45Mbps甚至達(dá)到100Mbps和200Mbps的高速率,傳輸距離可達(dá)300米。在中壓配電網(wǎng)傳輸技術(shù)方面,高于10Mbps數(shù)據(jù)信號的設(shè)想和方案也日益引起人們的重視并開發(fā)成功。 PLC的工作原理:電力線是一個極其不穩(wěn)定的高躁聲、強(qiáng)衰減的傳輸通道,要實(shí)現(xiàn)可靠的電力線高速數(shù)據(jù)通信,必須解決低壓配電網(wǎng)上各種因素如:噪聲、阻抗波動、配電網(wǎng)結(jié)構(gòu)、電磁兼容性以及線路阻抗和容性負(fù)載引起的信號衰減等主要因素對數(shù)據(jù)傳輸?shù)挠绊憽? 為了解決以上低壓配電網(wǎng)中各因素對數(shù)據(jù)傳輸?shù)挠绊?,在國際范圍內(nèi),低壓配電網(wǎng)的高速數(shù)據(jù)通信普遍選擇了正交頻分復(fù)用技術(shù)OFDM(OrthogonalFrequencyDivisionMultiplexing)作為核心調(diào)制技術(shù)。OFDM技術(shù)采用多路窄帶正交子載波,同時傳輸多路數(shù)據(jù),每路信號的碼元時間較長,可以避免碼元間干擾。通過動態(tài)選擇可用的子載波,該技術(shù)可以減少窄帶干擾和頻率的谷點(diǎn)的影響。 OFDM技術(shù)起源于二十世紀(jì)六十年代,主要用于軍用高頻通信系統(tǒng)。70年代,隨著離散傅立葉變換來實(shí)現(xiàn)多載波調(diào)制技術(shù)的提出,以及近年來數(shù)字信號處理(DSP)技術(shù)的飛速發(fā)展,OFDM作為一種可以有效對抗信號波形間干擾的高速傳輸技術(shù)被廣泛應(yīng)用于民用通信系統(tǒng)中。目前在無線局域網(wǎng)已經(jīng)采用了該技術(shù),第四代移動通信(4G)中將采用OFDM技術(shù)。 PLC的幾種接入方案 在低壓配電網(wǎng)數(shù)據(jù)傳輸系統(tǒng)一般情況下,由頭端(HE)和用戶端(CE)組成。頭端一般安裝在配電變壓器低壓出線端,它主要實(shí)現(xiàn)PLC高頻信號和傳統(tǒng)的寬帶通信信號的互相轉(zhuǎn)換。PLC頭端的一側(cè)通過電容或電感耦合器連接電力電纜,注入和提取高頻PLC信號;另一側(cè)通過傳統(tǒng)電信接入方式,如xDLS、光纖或以太網(wǎng)等連接至Internet。用戶側(cè)稱為“電力貓”的設(shè)備,主要由接口、調(diào)制解調(diào)和耦合等三部分組成。用戶的計(jì)算機(jī)通過以太網(wǎng)接口或USB接口、普通話機(jī)通過RJ-11接口與“電力貓”相連。實(shí)現(xiàn)高速上網(wǎng)、IP電話以及IP視頻等多媒體接入服務(wù)。
廈門卡庫電氣有限公司 經(jīng)銷批發(fā)的AB、Scheneider、Siemens、FANUC,F(xiàn)OXBORO,安川,GE,艾默生、無暢銷消費(fèi)者市場,在消費(fèi)者當(dāng)中享有較高的地位,公司與多家零售商和代理商建立了長期穩(wěn)定的合作關(guān)系。廈門卡庫電氣有限公司經(jīng)銷的AB、Scheneider、Siemens、FANUC,F(xiàn)OXBORO,安川,GE,艾默生、品種齊全、價格合理。廈門卡庫電氣有限公司實(shí)力雄厚,重信用、守合同、保證產(chǎn)品質(zhì)量,以多品種經(jīng)營特色和薄利多銷的原則,贏得了廣大客戶的信任。
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