標準號：BS EN 50162-2005
中文標準名稱：直流系統中雜散電流引起腐蝕的防護
英文標準名稱：Protection against corrosion by stray current from direct current systems
標準類型：K04;A29
發布日期：2005/1/19 12:00:00
實施日期：2005/1/19 12:00:00
中國標準分類號：K04;A29
國際標準分類號：29.020;77.060
適用范圍：This standard establishes the general principles to be adopted to minimize the effects of stray currentcorrosion caused by direct-current (d.c.) on buried or immersed metal structures.The standard is intended to offer guidance for:the design of direct current systems which may produce stray currents;the design of metal structures, which are to be buried or immersed andwhich may be subject to stray current corrosion;the selection of appropriate protection measures.The standard mainly deals with external stray current corrosion on buried or immersed structures.However stray current corrosion may also occur internally in systems containing an electrolyte e.g.near insulating joints or high resistance pipe joints in a water pipeline.These situations are not dealt with in detail in this standard but principles and measures describedhere are generally applicable for minimizing the interference effects.Stray currents may also cause other effects such as overheating. These are not covered in thisstandard.D.C. systems that can cause currents to flow in the earth or any other electrolyte, whether intentionalor unintentional, include:d.c. traction systems;trolley bus systems;d.c. power systems;d.c. equipment at industrial sites;d.c. communication systems ;cathodic protection systems;high voltage d.c. (HVDC) transmission systems;d.c. track circuit signalling systems. For stray currents from traction systems EN 50122-2 givesrequirements for minimizing their production and for the effects within the railroad.Systems which may be affected by stray currents include buried or immersed metal structures suchas:a) pipelines;b) metal sheathed cables;c) tanks and vessels;d) earthing systems;e) steel reinforcement in concrete;f) steel piling.An affected structure carrying stray currents, e.g. a pipeline or cable may itself affect other nearbystructures (see Clause 8).This standard does not address the effect of a.c. stray current. Where a.c. stray current is suspected,care should be taken when taking measurements on any components due to risk of large inducedvoltages. If a.c. stray current interference is present the criteria described in this standard will notapply.