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class="input"> <input name="keyword" onblur="if(this.value=='')this.value='請(qǐng)輸入您要查詢(xún)的產(chǎn)品'" onfocus="this.value=''" value="請(qǐng)輸入您要查詢(xún)的產(chǎn)品" type="text" class="search-txt"> <input name="" type="submit" class="search-btn" value=""> </form> </div> <div id="iqaqewgi6e" class="clear"></div> </div> </div> <div id="iqaqewgi6e" class="nybanner"><img src="/skins/106676/images/nybanner.jpg"></div> <script src="http://www.chem17.com/mystat.aspx?u=mbdzkj"></script>  <div id="iqaqewgi6e" class="ncontent w_1100"> <div id="iqaqewgi6e" class="h-6">技術(shù)文章<span>您當(dāng)前的位置：<a href="/">首頁(yè)</a> > <a href="/article.html">技術(shù)文章</a> > 什么是氧化鋅避雷器？其試驗(yàn)項(xiàng)目有哪幾種？</span></div>  <div id="iqaqewgi6e" class="n-3 c-news"> <div id="iqaqewgi6e" class="newsnr"> <h1>什么是氧化鋅避雷器？其試驗(yàn)項(xiàng)目有哪幾種？</h1> <p class="source"><span>日期：2020-09-03</span><span>瀏覽：1514次</span></p> <div> <p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;">氧化鋅避雷器由氧化鋅電阻片組裝而成，具有較好的非線(xiàn)形“伏-安”特性。在正常工頻電壓下，具有*的電阻，呈現(xiàn)絕緣狀態(tài)。在過(guò)電壓作用下，則呈現(xiàn)低阻狀態(tài)，使與之并聯(lián)的電器設(shè)備的殘壓被抑制在設(shè)備絕緣安全值以下，待過(guò)電壓消失后，有恢復(fù)高阻絕緣狀態(tài)，從而保護(hù)電器設(shè)備的絕緣免受過(guò)電壓的損害。氧化鋅避雷器與閥型避雷器相比具有動(dòng)作迅速、通流容量大、殘壓低、無(wú)續(xù)流，對(duì)大氣過(guò)電壓和操作過(guò)電壓都起保護(hù)作用，具有結(jié)構(gòu)簡(jiǎn)單、可靠性高、壽命長(zhǎng)、維護(hù)簡(jiǎn)單、體積小等優(yōu)點(diǎn)，廣泛用于電氣設(shè)備的防雷和過(guò)電壓保護(hù)。6kV系統(tǒng)中，氧化鋅避雷器較多并聯(lián)在真空開(kāi)關(guān)上，以限制截流過(guò)電壓。其試驗(yàn)項(xiàng)目如下。</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> （1）測(cè)量絕緣電阻。采用2500V及以上兆歐表，35kV及以下，不低于2500MΩ；35kV及以下，不低于1000MΩ。</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><img alt="" src="http://img74.chem17.com/9/20200903/637347166261892646299.jpg" style="width:800px" /></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 15px; line-height: inherit; font-family: 微軟雅黑, Arial, 宋體; color: rgb(24, 24, 24);"><font style="margin: 0px; padding: 0px;"> （2）測(cè)量直流1mA的電壓及該電壓75%值時(shí)的泄漏電流。對(duì)避雷器施加直流電壓，隨著電壓升高泄漏電流逐漸增大，當(dāng)電流值達(dá)到1mA時(shí)記下電壓值，然后將電壓降到該電壓值的75%并記下泄漏電流，其值不應(yīng)大于50μA。</font></p><p style="margin: 2px 0px; padding: 0px; border: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 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