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src="https://tyunfile.71360.com/WaterMark/UploadFile/keaton/637237707521357422/9684992.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="b7bnv77" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/WaterMark/UploadFile/keaton/637237707521357422/9684992.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="dzvthvl" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>江蘇省</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關鍵詞：</span>天津電力儀表設計廠家</p><p><span>***更新：</span>2020-05-27 05:33:10</p><p><span id="click" >瀏覽次數(shù)：1次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="lxvbrfj" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">江蘇基頓電氣自動化有限公司</a></p><p><span>聯(lián)系人：</span>高經(jīng)理</p><p><span>郵箱: </span>215741001@qq.com</p><p><span>電話: </span>13328157222</p><p><span>傳真: </span>0510_</p><p><span>網(wǎng)址: </span></p><p><span>手機: </span>0510-85027009</p><p><span>地址: </span>長安鎮(zhèn)友誼路28號</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="nljx7xl" class="page-proshow02"><p class="title">詳細說明</p><div id="xrxfbxh" class="box"><p><p> 頻率表是指測量頻率的機械式指示電表。頻率表種類很多，有電動系、鐵磁電動系和屬于整流式的變換器式頻率表等。 </p> <p> 原理<span style="display:none;"></span> </p> <p> 鐵磁電動系頻率表的測量機構與電路如圖，天津電力儀表設計廠家。帶有鐵心的固定線圈與電感器L、電容器C組成的串聯(lián)諧振電路,通常被調整在標尺的中間頻率(例如50赫)時諧振?？蓜硬糠钟蓛蓚€線圈組成，天津電力儀表設計廠家，其中動圈1與電容器C1串聯(lián)后與諧振電路并聯(lián)。接通電源時，可動部分所受轉動力,I、I1分別為固定線圈及動圈1中電流,θ為兩電流相量間夾角，K為系數(shù)。動圈2與電阻器R2、電感器L2構成閉合回路。當可動部分指針偏離標尺中間位置α角時，動圈2將受到一個與偏轉角α成正比、并使指針返回中間位置的反抗力矩。當被測頻率等于標尺中間頻率時,諧振電路發(fā)生諧振，天津電力儀表設計廠家,這時固定線圈中的電流與動圈1中電流相量間夾角θ=90°,因而轉動力矩M=0。于是可動部分在動圈2力矩的作用下，使指針指在標尺的中間頻率（例如50赫）的刻度上。當被測頻率偏離中間頻率時，諧振條件被破壞，轉動力矩不再為零，可動部分發(fā)生偏轉，直到轉動力矩與反抗力矩平衡時為止，可動部分將停在與被測頻率對應的新位置上。改變串聯(lián)諧振電路的參數(shù)，可以獲得不同的頻率量程。 </p> <p> <br /> </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="天津電力儀表設計廠家" src="https://tyunfile.71360.com/WaterMark/UploadFile/keaton/637237707521357422/9684992.jpg"></div><p> 功率表分類標準 </p> <p> 根據(jù)被測信號頻率分類 </p> <p> 功率計可分為：直流功率計、工頻功率計、變頻功率計、射頻功率計和微波功率計。由于直流功率等于電壓和電流的簡單乘積，實際測量中，一般采用電壓表和電流表替代。工頻功率計是應用較普遍的功率計，常說的功率計一般都是指工頻功率計。變頻功率計是21世紀變頻調速技術高速發(fā)展的產(chǎn)物。其測量對象為變頻電量，變頻電量是指用于傳輸功率的 </p> <p> 變頻電量包括電壓、電流以及電壓電流引出的有功功率、無功功率、視在功率、有功電能、無功電能等。 </p> <p> 除了變頻器輸出的PWM波，二極管整流的變頻器輸入的電流波形，直流斬波器輸出的電壓波形，變壓器空載的輸入電流波形等，均含有較大的諧波，右圖中為常見變頻電量的波形及相關頻譜圖。 </p> <p> 由于變頻電量的頻率成分復雜，變頻功率計的測量一般包括基波有功功率（簡稱基波功率）、諧波有功功率（簡稱諧波功率）、總有功功率等，相比工頻功率計而言，其功能較多，技術較復雜，一般稱為變頻功率分析儀或寬頻功率分析儀，部分高精度功率分析儀也適用于變頻電量測量。 </p> <p> 變頻功率分析儀可以作為工頻功率分析儀使用 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="天津電力儀表設計廠家" src="https://tyunfile.71360.com/WaterMark/UploadFile/keaton/637237707521308594/2790389.jpg"></div><p> 電氣參數(shù)測量 </p> <p> SWL300系列智能電力儀表可以提供下列電氣參數(shù)的實時測量： </p> <p> ■電壓V：三相相電壓、線電壓及其平均電壓 </p> <p> ■電流I：三相線電流及其平均、中線電流 </p> <p> ■有功功率P:各相有功功率和系統(tǒng)有功功率 </p> <p> ■無功功率Q:各相無功功率和系統(tǒng)無功功率 </p> <p> ■視在功率S:各相視在功率和系統(tǒng)視在功率 </p> <p> ■功率因數(shù)PF:各相功率因數(shù)和系統(tǒng)功率因數(shù) </p> <p> ■頻率F:系統(tǒng)的頻率電能計量功能可實現(xiàn)高精度的雙向電能計量。計量的電能包括輸入/輸出有功電度、輸入/輸出無功電度，同時還包括***值和凈電度值。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" 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