描述
A16B-1010-0050
對廠家送來的電能表實物進(jìn)行檢驗，主要是從以下幾個方面進(jìn)行。即：機械要求、所能適應(yīng)的氣候條件、電氣要求、電磁兼容性、準(zhǔn)確度要求這五個方面。這五個方面在國家標(biāo)準(zhǔn)《1級和2級靜止式交流有功電能表》(GB/T17215-1998)中都有明確的規(guī)定。規(guī)定中有些試驗和檢驗項目一般地市級及縣級供電企業(yè)有條件檢驗，但有相當(dāng)多的項目還不具備條件檢驗。下面將需要注意的地方和解決的辦法做一簡要說明。? 對廠家送來的電能表實物進(jìn)行檢驗，主要是從以下幾個方面進(jìn)行。即：機械要求、所能適應(yīng)的氣候條件、電氣要求、電磁兼容性、準(zhǔn)確度要求這五個方面。這五個方面在國家標(biāo)準(zhǔn)《1級和2級靜止式交流有功電能表》(GB/T17215-1998)中都有明確的規(guī)定。規(guī)定中有些試驗和檢驗項目一般地市級及縣級供電企業(yè)有條件檢驗，但有相當(dāng)多的項目還不具備條件檢驗。下面將需要注意的地方和解決的辦法做一簡要說明。準(zhǔn)確度要求包括，電流及功率因數(shù)改變、電壓改變、頻率改變、起動試驗、潛力試驗、走字試驗等這些項目的檢驗一般地市級及縣級供電企業(yè)都能進(jìn)行檢驗。電子式電能表在規(guī)程規(guī)定的負(fù)載范圍內(nèi)，一般線性度都比較好，但不同廠家的表實際準(zhǔn)確計量的負(fù)載范圍有很大差別，由于現(xiàn)場實際負(fù)載電流是經(jīng)常變化的，能準(zhǔn)確計量的負(fù)載范圍越寬，表的負(fù)載性能越好。在農(nóng)村有些地區(qū)電網(wǎng)電壓波動比較大。要注意檢查電壓波動極限情況下，電能表的誤差。特別是低電壓時的輕載誤差和電能表走字是否有力，檢查表內(nèi)直流電源電壓不能下降到計量器及芯片的工作電壓以下，直流電源的波紋不能有明顯地增加。電氣要求的功率消耗檢驗，包括電壓線路和電流線路，可以用互感器校驗儀測量電能表的電壓、電流和負(fù)載阻抗后，計算出額定電壓、額定電流下電能表的功率消耗。這種方法既準(zhǔn)確又方便;電源影響、電壓降落和短時中斷、自熱影響可以在電能表校驗臺上模擬進(jìn)行;短時過電流會影響檢驗，嚴(yán)格按規(guī)程定義做比較困難，可以在2倍最大電流下，逐步延長時間，檢測電能表的溫升(電流端子及取樣電阻)和誤差。這可以了解電能表過負(fù)載后的損壞程度。這兩項對電子式電能來說都很重要。尤其是電磁兼容性能對電子式電能表影響極為嚴(yán)重，電磁兼容性能較差的表，現(xiàn)場運行中往往出現(xiàn)”死機”、”飛字”等現(xiàn)象，甚至內(nèi)部電子元件損壞。這是電子式電能表有別于機械式電能表的一個重要特性。電磁兼容檢驗一共有5個項目，即：靜電放電試驗、高頻電磁場試驗、電快速瞬變脈沖群試驗、浪涌試驗、無線電干擾抑制試驗。其中浪涌和脈沖群比較接近電網(wǎng)中的一些瞬態(tài)情況，建議有條件的地市級及縣級供電企業(yè)購置相應(yīng)設(shè)備，對電能表進(jìn)行抽查檢驗。 另外需要注意的有，由于目前電子表的機械計量器，還沒有從原理上根本解決卡字問題。主要是通過選擇制造工藝好的計量器和進(jìn)廠時嚴(yán)格篩選保證電能表整機質(zhì)量。因此，要特別注意計量器的質(zhì)量。步進(jìn)電機有屏蔽可以防電磁干擾，外殼采用鋁合金支架、齒輪精細(xì)、無毛刺、材料不易變形、有自潤滑性能、步進(jìn)電機磁性能強、加工精密，都可以減少卡字的問題。要注意仔細(xì)檢查和了解。再就是要進(jìn)行走字檢驗。為更嚴(yán)格地考核計量器質(zhì)量，保證安裝到現(xiàn)場的電能表在電壓允許范圍內(nèi)都能正確計量，建議采用本地區(qū)電網(wǎng)可能出現(xiàn)的最低(不考慮暫態(tài))電壓進(jìn)行走字試驗。
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主營DCS系統(tǒng)配件
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