价格优惠机械设备铝合金牺牲阳极

Price discount machinery equipment aluminum alloy sacrifice anode

在主管线连头前，测量的主套管绝缘电阻应该大于2MΩ。主管线连头以后可以通过测量套管和主管电位的方式检测套管是不是与主管短路。两者的电位值应该存在一点的偏差。一般在二百到五百毫伏之间。

    主管线连头以后可以用土壤电阻率测量仪测量主套管之间的绝缘电阻，测量仪的电流输出接线柱连接外侧的连接线，电位接线柱连接内侧连接线，测量的电阻值应该大于0.01欧姆。用临时电源、变阻器、电压表、电压表，使用电流套管和主套管测量电压降，计算他们之间的电阻。这种方法比较类似于测量阳较电缆的接触电阻，也可以采用接地电阻测量仪进行测量，测量得到的数据应该是大于0.01欧姆。这里需要特别注意的是即便是电阻值大于0.01欧姆，也不能因此就完全判定主套管没有短路的情况。////////////

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