市内电话地下电缆和地下其它金属管线(煤气管、自来水管、电力电缆等)一样,难免要发生腐蚀。腐蚀发生后必须先查清原因,然后再考虑预防措施。下面把常见的漏泄电流腐蚀等因素和预防措施列举12例,仅供参考。 1、有轨电车漏泄电流所引起的腐蚀有轨电车供电原理如图1,图中符号“→”表示电流方向(下同)。 Underground telephone underground telephone and underground metal pipelines (gas pipe, water pipes, power cables, etc.), it is inevitable to corrosion. Corrosion must first identify the cause, and then consider preventive measures. The following common leakage current corrosion and other factors and precautions listed in 12 cases, for reference purposes only. 1, the railroad car leakage current corrosion caused by railcar power supply principle shown in Figure 1, the symbol “→ ” said the current direction (the same below).