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class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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(guān)鍵詞：</span>甘肅微機(jī)保護(hù)批發(fā)</p><p><span>***更新：</span>2020-05-22 17:33:28</p><p><span id="click" >瀏覽次數(shù)：8次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="rfhfxf5" 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(dòng)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(jī): </span>0510-85027009</p><p><span>地址: </span>長安鎮(zhèn)友誼路28號(hào)</p><p>[當(dāng)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="rvltzx5" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="vrxvl7b" class="box"><p><p> 微機(jī)繼電保護(hù)的輸入信號(hào)是電力系統(tǒng)的模擬量，而計(jì)算機(jī)只能對(duì)數(shù)字量進(jìn)行計(jì)算和判斷，因此由電力系統(tǒng)經(jīng)電壓互感器和／或電流互感器輸入的模擬量必先經(jīng)過預(yù)處理<span style="display:none;"></span> </p> <p> 繼電保護(hù)在大部分情況下取用輸入信號(hào)中的基波模擬量，甘肅微機(jī)保護(hù)批發(fā)。根據(jù)采樣定理，如被測信號(hào)頻率（或要求保留的比較高次諧波頻率）為f0,則采樣頻率fδ必須大于2f0,否則由采樣值不可能擬合還原成原來的曲線。對(duì)于那些大于0.5fδ頻率的諧波分量,必須在進(jìn)入采樣器之前，利用模擬式低通濾波器（前置模擬濾波）將其濾掉。 </p> <p> 由于輸入信號(hào)常常有多個(gè)，故設(shè)置多路轉(zhuǎn)換器將輸入模擬信號(hào)逐個(gè)交與A/D變換器轉(zhuǎn)化成數(shù)字量。這些數(shù)字量應(yīng)在存儲(chǔ)器中按先后順序排列，甘肅微機(jī)保護(hù)批發(fā)，以便后續(xù)功能處理程序取用。 </p> <p> 為了保證計(jì)算機(jī)計(jì)算和判斷的正確，實(shí)現(xiàn)以某種頻率的正弦電量為基礎(chǔ)的繼電保護(hù)原理,必須將經(jīng)A/D變換后的數(shù)字量再經(jīng)一次濾波。由于數(shù)字濾波器精度高，甘肅微機(jī)保護(hù)批發(fā)、可靠而且調(diào)整靈活，通過時(shí)分復(fù)用可使裝置簡化，因此微機(jī)保護(hù)中普遍采用數(shù)字濾波器。數(shù)字濾波器本身可理解為一個(gè)計(jì)算程序或算法，它將表示輸入信號(hào)的數(shù)字時(shí)間序列轉(zhuǎn)換為表示輸出信號(hào)的數(shù)字時(shí)間序列，使信號(hào)按照預(yù)定的形式變化。<span style="display:none;"></span> </p> <p> <br /> </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="甘肅微機(jī)保護(hù)批發(fā)" src="https://tyunfile.71360.com/UploadFile/keaton/637243828630937500/5493284.jpg"></div><p> 高壓電柜中的微機(jī)保護(hù)裝置作用；微機(jī)保護(hù)裝置可以通過接入的電流互zhidao感器，電壓互感器等測量元件的信號(hào)對(duì)回路的狀態(tài)進(jìn)行監(jiān)視，控制以及保護(hù)。比如短路保護(hù)，過載保護(hù)，單相接地保護(hù)等等。 </p> <p> 微機(jī)保護(hù)是由高集成度、總線不出回芯片單片機(jī)、高精度電流電壓互感器、高絕緣強(qiáng)度出口中間繼電器、高可靠開關(guān)電源模塊等部件組成。微機(jī)保護(hù)裝置主要作為110KV及以下電壓等級(jí)的發(fā)電廠、變電站、配電站等，也可作為部分70V-220V之間電壓等級(jí)中系統(tǒng)的電壓電流的保護(hù)及測答控。 </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="甘肅微機(jī)保護(hù)批發(fā)" src="https://tyunfile.71360.com/UploadFile/keaton/637243828631074219/8838516.jpg"></div><p> 微機(jī)繼電保護(hù)中應(yīng)根據(jù)電力系統(tǒng)信號(hào)的特點(diǎn)和保護(hù)原理的要求設(shè)計(jì)、選擇相應(yīng)的數(shù)字濾波器。數(shù)學(xué)濾波器的主要性能指標(biāo)是頻域特性、時(shí)延和計(jì)算量。 </p> <p> 算法問題對(duì)離散和量化的數(shù)字式采樣序列，用數(shù)學(xué)運(yùn)算方法實(shí)現(xiàn)故障量的測量，這就是微機(jī)保護(hù)的算法問題。要求運(yùn)算精度滿足保護(hù)的實(shí)際需要，同時(shí)計(jì)算時(shí)間又盡可能短。微機(jī)繼電保護(hù)的研究初期，一些算法是基于被采樣的電壓、電流均系**弦波的，為此應(yīng)將輸入信號(hào)進(jìn)行預(yù)處理。稍后，相繼提出傅里葉算法和沃爾什函數(shù)算法。它們假定輸入信號(hào)中含有非周期分量、基波和高次諧波。這些算法本身具有很強(qiáng)的濾去高次諧波的功能，因此無需另設(shè)數(shù)字濾波器，但對(duì)非周期分量必須采取其他措施。由于電力系統(tǒng)中大量應(yīng)用鐵磁非線性元件，輸電線路分布電容和串聯(lián)、并聯(lián)電容，以及電壓互感器、電流互感器的暫態(tài)特性等因素的影響，使微機(jī)繼電保護(hù)輸入信號(hào)中還含有許多隨機(jī)高頻分量，它們起著干擾或噪聲的作用。對(duì)此，可采用**小二乘曲線擬合算法或?qū)τ?jì)算結(jié)果采取平滑措施。上述種種算法都是先算出電壓、電流的大小和相位，然后根據(jù)保護(hù)的動(dòng)作判據(jù)作進(jìn)一步的運(yùn)算，**終實(shí)現(xiàn)其保護(hù)功能。也有一些算法將電量運(yùn)算與保護(hù)動(dòng)作判據(jù)運(yùn)算直接結(jié)合在一起<br /> <span style="display:none;"></span> </p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="甘肅微機(jī)保護(hù)批發(fā)" src="https://tyunfile.71360.com/WaterMark/UploadFile/keaton/637244446342324219/1373172.jpg"></div></p><br /><p>文章來源地址: 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