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normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">在高壓發(fā)電機的絕緣測試工作中，測量定子繞組絕緣電阻和吸收比是一種常用的檢查絕緣狀態(tài)的方法。對于發(fā)電機絕緣性能的測試，主要是測量一下幾個方面的性能。</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">（1）電氣性能測量</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">所謂電氣性能，是指絕緣具有的耐電強度，并能承受過電壓侵襲的能力。通常在工作電壓及工作溫度下，絕緣的介質損耗因數(shù)tgδ很小且較穩(wěn)定，同時具有較高的起始游離電壓，絕緣壽命一般可達25-30年以上。</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">（2）熱性能測量</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">絕緣的熱性能，是指絕緣應具有承受持續(xù)熱作用的耐熱性能，也即在發(fā)電機工作溫度條件下不應有浸漬漆和粘合劑流出，以及迅速老化的現(xiàn)象。</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">發(fā)電機轉子交流阻抗測試儀</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">（3）機械性能</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">絕緣在制造過程及運行時所受到的各種機械力作用下，其耐電強度不應有明顯降低。汽輪發(fā)電機定子絕緣受到的機械應力特別高，其主要因素如下：</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">1.絕緣材料的膨脹延伸</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">由于定于線棒的夾層絕緣溫度膨脹系數(shù)不同，沿線槽長度和寬度上的溫升不同，在繞組加熱及冷卻時銅線、絕緣和定子鐵芯的延伸各不相同，因而使絕緣中不可避免地出現(xiàn)巨大的機械應力。這樣，久而久之就使絕緣彈性衰減而發(fā)生裂紋，結構破壞甚至在運行中發(fā)生擊穿。</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">2.端接部分電動力</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">正常運行及突然短路時端接部分中發(fā)生的電動力。</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">3.幅向交變電動力</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">定子繞組的橫向磁通使導體受到幅向的交變電動力。此外，在額定電流下汽輪發(fā)電機單根線棒上也會產(chǎn)生數(shù)值達幾千牛的力，并以100次／s的頻率作用于線棒絕緣。短路時這些力可能達到數(shù)百噸的瞬間沖擊。如果線棒絕緣的機械強度不夠和機械固定松弛，則將使絕緣斷裂或磨損，而導致絕緣擊穿。</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">（4）化學性能</p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; line-height: 24px; font-family: 宋體; color: rgb(85, 85, 85); background-color: rgb(255, 255, 255);">嚴重的電暈會產(chǎn)生臭氧和各種氧化氮，前者是強烈的氧化劑，侵蝕大多數(shù)有機材料；后者遇到水分形成硝酸或亞硝酸，致使纖維材料變脆及金屬腐蝕。所以使用耐電暈的材料和防止電暈的產(chǎn)生，是高壓電機絕緣的重要問題。</p> <div id="yq00aqiue" class="clear"></div> </div> <div id="yq00aqiue" class="article"> <p>上一篇：<a href="/Article-3142952.html">絕緣油擊穿電壓原理及測試</a></p> <p>下一篇：<a href="/Article-3142950.html">絕緣電阻測試的原理和影響測試結果的因素</a></p> 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