春晨 JBQ電機引接線引出線_江蘇春晨電纜有限公司

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江蘇春晨電纜有限公司生產春晨 JBQ電機引接線引出線，

高電壓對絕緣電阻的影響：泄露電流

Influence of high voltage on insulation resistance: leakage current

絕緣材料在恒定電壓的作用下，總有一微小的泄漏電流通過。泄漏電流的大小與材料的電導率成正比，與其絕緣電阻成反比。將一塊固體絕緣材料兩端加上直流電壓，則流過其內部（而非表面）的電流隨時間的變化趨勢如下圖所示所示。春晨 JBQ電機引接線引出線

Under the action of constant voltage, the insulating material always has a small leakage current. The leakage current is directly proportional to the conductivity of the material and inversely proportional to its insulation resistance. When DC voltage is applied to both ends of a piece of solid insulating material, the current flowing through its interior (not its surface) will change with time as shown in the figure below.

固體絕緣材料中的電流i與時間t的關係

The relationship between current I and time t in solid insulating materials

固體絕緣材料中的電流i與時間t的關係

The relationship between current I and time t in solid insulating materials

在接通電源的瞬間，充電電流ic可達到很高值，但迅速進入吸收電流階段。ia是由於介質內分子、離子等的極化造成的，其大小隨時間變化，也受電極形狀、介質的種類以及溫度等的影響。吸收電流完全衰減至一恒定電流值ig往往需要數分鐘以上的時間，有的材料甚至需要幾小時至幾天的時間，ig稱為泄漏電流，它由介質的絕緣電阻所決定。ia與ig的比值達數倍至數十倍。因此，如果在施加電壓後馬上測電流，並依此來計算絕緣電阻，則此電阻值顯著偏小。通常測試絕緣電阻時應以施加電壓1分鐘或10分鐘後的電流來求出。

At the moment of power on, the charging current IC can reach a very high value, but quickly enter the absorption current stage. IA is caused by the polarization of molecules and ions in the medium. Its size changes with time, and is also affected by the electrode shape, the type of medium and temperature. It usually takes more than a few minutes for the absorption current to completely decay to a constant current value Ig. Some materials even take a few hours to several days. Ig is called leakage current, which is determined by the insulation resistance of the medium. The ratio of IA to Ig is several to dozens of times. Therefore, if the current is measured immediately after the voltage is applied and the insulation resistance is calculated according to this, the resistance value is significantly smaller. Generally, the insulation resistan

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春晨 JBQ電機引接線 引出線

春晨 JBQ電機引接線引出線