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<h2>其實并不難！銷售技術(shù)看這邊！&#160;菜鳥介紹智能電力儀表知識！（上）</h2> <p class="smal-hide"> <span>發(fā)布時間：2019-07-12 11:33:42</span><span id="gcwngve" class="smal-hide">來源：</span> </p> </header> <div id="tvkgymb" class="zx_content js_target_content" data-font="16"><p>所謂<a title="電力儀表新聞專題"><u>電力儀表</u></a>，即用來測量電氣參數(shù)的儀表。</p><p>此儀表已經(jīng)經(jīng)歷多重演變，現(xiàn)在已經(jīng)成為了集多種功能于一身的智能儀表，此文所介紹的儀表即為智能電力儀表。</p><p>先讓我們來了解一下不同時期的儀表吧：</p><p><strong>指針表</strong></p><p>指針表，基于電磁和機械原來來實現(xiàn)電氣參數(shù)的測量。</p><p><strong>數(shù)顯表</strong></p><p>電子技術(shù)的應(yīng)用，實現(xiàn)了測量數(shù)據(jù)的數(shù)碼管呈現(xiàn)。早年已經(jīng)得到廣泛應(yīng)用，通常叫數(shù)顯表。</p><p><strong>多功能表</strong></p><p>比較早期的電力儀表是一只儀表測量一個電氣參數(shù)的。后來電子技術(shù)的應(yīng)用，實現(xiàn)了多種電氣參數(shù)同時測量。例如同時測量電流、電壓等。</p><p><strong>智能電力儀表</strong></p><p>有“芯”的儀表，可以實現(xiàn)更多應(yīng)用功能的儀表。</p><p>認(rèn)識智能設(shè)備，我通常秉承一個思路：</p><p>信息輸入——數(shù)據(jù)處理——信息輸出(信息呈現(xiàn))</p><p>基于此思路，我們來認(rèn)識一下智能電力儀表吧。它長下面這個樣子。</p><p><strong>1模擬量采集</strong></p><p>模擬量數(shù)據(jù)采集(即信息輸入)是啥意思呢?</p><p>作為儀表，總要有基礎(chǔ)信息的采集吧。此儀表采集的是三相電流和三相電壓。</p><p>智能儀表的強大就在這里，三相電流輸入(A、B、C三相的電流)和三相電壓輸入儀表后，我們通過這6個基礎(chǔ)數(shù)據(jù)可以得到更多豐富的數(shù)據(jù)。例如：三相電流、平均電流、電流比較大值(包含比較值出現(xiàn)的時間)等。</p><p>概括一下即可獲得下面的數(shù)據(jù)：</p><p><strong>1)電氣測量參數(shù)</strong></p><p>電氣測量參數(shù)包含：</p><p>三相電流、電流平均值及比較值</p><p>三個相電壓、相電壓平均值及比較值;</p><p>三個線電壓、線電壓平均值及比較值;</p><p>各相的功率因數(shù)及總功率因數(shù);</p><p>系統(tǒng)頻率;</p><p>有功功率;</p><p>無功功率;</p><p>視在功率;</p><p><strong>2)電能質(zhì)量參數(shù)</strong></p><p>儀表可以對基礎(chǔ)的電能質(zhì)量參數(shù)進(jìn)行監(jiān)視和分析，包含：</p><p>電流和電壓2~31次諧波含量及總諧波畸變率</p><p>三相不平衡度</p><p>電話諧波因子</p><p>K系數(shù)</p><p><strong>3)電能消耗數(shù)據(jù)</strong></p><p>電力儀表已經(jīng)可以干電度表的活兒了，體現(xiàn)在它可以對有功電能和無功電能實現(xiàn)雙向計量，包含輸入電能、輸出電能、總電能和凈電能值的統(tǒng)計等。</p><p>4)數(shù)據(jù)記錄</p><p>數(shù)據(jù)記錄是一個很牛叉的衍生功能，它的作用主要表現(xiàn)在所記錄的事件帶時標(biāo)，這些數(shù)據(jù)有助于對設(shè)備異常運行原因的分析。</p><p><strong>2數(shù)字信號</strong></p><p>數(shù)字信號的輸入也屬于信息輸入的內(nèi)容，又常被叫做“開關(guān)量輸入”。</p><p>對于每一只儀表的這部分功能，我們需要關(guān)注的是：</p><p>1)儀表的數(shù)字量輸入數(shù)量，即可以采集幾個接點信號;</p><p>2)數(shù)字信號的輸入是有源接點還是無源接點;</p><p>儀表是否自帶數(shù)字信號電源，如果儀表需要外配電源的話，是采用直流電壓還是交流電壓，其電壓值范圍是多少?</p><p>今天介紹的這款儀表常規(guī)配置為4個數(shù)字量輸入，儀表自帶24Vdc電源。</p><p><strong>3數(shù)據(jù)呈現(xiàn)</strong></p><p>儀表的數(shù)據(jù)呈現(xiàn)方式大多數(shù)包含如下三種方式。</p><p>大屏幕液晶顯示界面，顯示內(nèi)容直觀。通過面板按鍵可以對參數(shù)進(jìn)行基礎(chǔ)設(shè)置及查閱。這一點將的是我們視覺上比較直觀的呈現(xiàn)了。</p><p><strong>繼電器輸出</strong></p><p>繼電器的輸出需要關(guān)注的問題包含：繼電器的數(shù)量，繼電器接點的容量。</p><p>我們今天介紹的這款儀表可配置2個繼電器輸出接口，接點容量為3A/250Vac。</p><p>繼電器輸出的作用是什么呢?</p><p>1)實現(xiàn)對斷路器的遠(yuǎn)程控制，繼電器作為分閘和合閘命令的輸出接口;</p><p>2)告警。應(yīng)用比較多的是參數(shù)越限告警，例如：設(shè)定電流值超過某一限制則告警，此時驅(qū)動繼電器輸出。</p> 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