價(jià)格優(yōu)惠機(jī)械設(shè)備鋁合金犧牲陽極

Price discount machinery equipment aluminum alloy sacrifice anode

在主管線連頭前，測量的主套管絕緣電阻應(yīng)該大于2MΩ。主管線連頭以后可以通過測量套管和主管電位的方式檢測套管是不是與主管短路。兩者的電位值應(yīng)該存在一點(diǎn)的偏差。一般在二百到五百毫伏之間。

    主管線連頭以后可以用土壤電阻率測量儀測量主套管之間的絕緣電阻，測量儀的電流輸出接線柱連接外側(cè)的連接線，電位接線柱連接內(nèi)側(cè)連接線，測量的電阻值應(yīng)該大于0.01歐姆。用臨時(shí)電源、變阻器、電壓表、電壓表，使用電流套管和主套管測量電壓降，計(jì)算他們之間的電阻。這種方法比較類似于測量陽較電纜的接觸電阻，也可以采用接地電阻測量儀進(jìn)行測量，測量得到的數(shù)據(jù)應(yīng)該是大于0.01歐姆。這里需要特別注意的是即便是電阻值大于0.01歐姆，也不能因此就完全判定主套管沒有短路的情況。////////////

This method is simple and easy to use, does not require an external power supply, rarely produces corrosion interference, and is widely used to protect small(current is generally less than 1 ampere) or in a low soil resistivity environment(soil resistivity is less than 100 ohms) metal structure. For example, urban pipe networks, small storage tanks and so on. According to reports from domestic sources, there are many failures in the use of sacrifice anodes. It is believed that the service life of sacrifice anodes generally does not exceed 3 years, *** more than 5 years. The main reason for the failure of the anode protection is the formation of a non-conductive hard shell on the anode surface, which limits the current output of the anode. The main reason for this problem is that the anode component does not meet the specification requirements, and the second is that the soil resistivity of the anode is too high.lb17184466