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    文章正文
    電工
    作者:管理員    發布于:2018-08-01 08:06:54    文字:【】【】【

     

     

    電工:電子技術基礎、常用電工儀器儀表使用知識、常用電工工具量具使用知識、常用材料選型知識、安全知識、相關法律法規知識、其他相關知識。

    一、 電工安全知識

    有關觸電的基本知識 觸電的類型 (電擊) 電擊是指電流通過人體內部,破壞人體內部組織,影響呼吸系統,心臟及神經系統的正常功能,甚至危及生命。 (電傷) 電傷是指電流的熱效應,化學效應,機械效應及電流本身作用造成的人體傷害。

     

    、電流對人體的傷害作用

    (一)電流對人體的影響 感知電流 他是指引起人體感知的最小電流。(男性:1.1mA 女性: 0.7mA) 擺脫電流 人觸電后能自行擺脫電源的最大電流稱為擺脫電流(男性: 16mA 女性:10mA) 第一章 電工安全知識 致命電流 是指在較短時間內危及生命的最小電流(>50mA引起心室顫動 >100mA足以致人于死亡 )

    (二)電源頻率對人體的影響 常用的50~60HZ的公頻交流電對人體的傷害程度最為嚴重

    (三)人體電阻的影響 人體電阻因人而異,基本上按表皮角質層電阻大小而定(人體電阻為1000~2000歐)

    (四)電壓大小的影響

    (五)電流路徑的影響 電流通過頭部會使人昏迷不醒而死亡;通過脊髓會導致截癱及嚴重損傷:通過中驅神經或有關部位,會引起中驅神經系統強烈失調而導致殘廢;通過心臟會造成心跳停止而忘;通過呼吸系統會造成窒息。實踐證明,從左手到腳是最危險的電流路徑,從右手到腳,從手到手也是很危險的路徑,從腳到腳是危險較小的路徑。 電流對人體的影響 安全電壓與通電時間的關系

     

    三、 常見的觸電形式

    (一) 單相觸電 當人站在地面上或其他接地體上,人體某一部位觸及一相帶電體時,電流通過人體流入大地(或中性線),稱為單相觸電

    (二)兩相觸電 指人體兩處同時觸及同一電源的兩相帶電體,以及在高壓系統中,人體距離高壓帶電體小于規定的安全距離,造成電弧放電。

    (三)跨步電壓觸電

    (四)接觸電壓觸電

    (五)感應電壓觸電

    (六)剩于電荷觸電

     

    、安全用電的措施 (一)組織措施 (二)技術措施 1。停電工作中的安全措施 1)切斷電源 2)驗電 3)裝設臨時地線 4)懸掛警告牌

    五、 觸電急救知識

    觸電急救一旦發生事故時,應立即組織人員急救。急救時必須做到沉著果斷,動作迅速,方法正確。首先要盡快的使觸電者脫離電源,然后根據觸電者的具體情況,采取相應的急救措施。 (一)脫離電源 (二)現場急救 1。簡單診斷 2。現場急救的方法 急救技術 (一)口對口人工呼吸法 (二)胸外心臟擠壓法 口對口人工呼吸法 胸外心臟擠壓法

    六、接地裝置 接地,是利用大地為正常運行,發生故障及遭受雷擊等情況下的電器設備等提供對地電流構成回路的需要,從而保證電氣設備和人身安全。因此,所有電氣設備或裝置的某一點(接地點)與大地之間有著可靠而符合要求的電氣連接。 基本概念 (一)接地裝置,接地體,接地線 (二)接地短路與接地短路電流 (三)接地裝置的散流現象 (四)散流電阻,接地電阻,公頻接地電阻,沖擊接地電阻 (五)中性點與中性線 (六)零點與零線 中性點和中性線 零點和零線。

    七、防火安全要求

     1、電氣火災直接原因 電氣設備過熱——短路、過載、接觸不良、 鐵芯發熱、散熱不良 電火花、電弧 工作火花與事故火花 工作火花是指電氣設備正常工作時或正常操作過程中產生的火花。如:開關或接觸器開合時產生的火花、插銷插拔時產生的火花。 事故火花是指線路或設備發生故障時出現的火花。如:發生短路時產生的火花、靜電火花、保險絲熔斷時的火花等

    2、電氣防火安全要求 電氣設備的額定功率要大于負載的功率 電線的截面積允許電流要大于負載電流 電氣設備的絕緣要符合安全要求 電氣設備的安裝要符合一定的安全距離 不可卸的接頭及活動觸頭要接觸良好 加強電氣設備的維護工作 燈具完整、無損傷,附件齊全 不同極性的帶電部件之間有合理的電氣間隙 開關、插座、接線盒及其面板等絕緣材料要有阻燃性 電線、電纜絕緣層厚度要符合有關規定 消除或減少爆炸性混合物 隔離 消除引燃源 接地措施完好

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