金屬表面絕緣防腐層過薄、漏金屬及漏電微孔處的電阻值和氣隙密度都很小，當有高壓經(jīng)過時就形成氣隙擊穿而產(chǎn)生火花放電，給報警電路產(chǎn)生一個脈沖信號，報警器發(fā)出聲光報警，根據(jù)這一原理達到防腐層檢漏目的
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