Investigation and measurement of DC stray current interference

In order to determine the influence of DC stray current corrosion and interference on buried metal structures, it is necessary to investigate and measure the environment and other structures and facilities in the environment. Generally, the interference source side and the disturbed side can be considered. For interference source side, some items with direct influence are usually considered. The influence degree and importance of each project varies with different interference sources and objects.

For the DC electrified railway, cathodic protection station and other interference sources near the buried metal structures that may be affected by the interference, several items should be investigated and measured in order to determine the possible situation of DC stray current

① Location of DC power supply station, cathodic protection station and other interference sources, status and distribution of feed network and return network;

② The operation, frequency and time-varying relationship of electrified locomotive, cathodic protection station and other interference sources;

③ Ground potential and distribution of rail and other interference sources;

④ Leakage current trend and potential gradient of rail and other interference sources;

⑤ If there are cathodic protection and / or drainage protection systems on the interference source device, their operating parameters and operating conditions shall be investigated and measured.

For buried metal structures that may be affected by interference, several items should be investigated and measured

① The relative position and distribution of buried metal structures and interference sources;

② The pipe to ground potential and its distribution, as well as its variation with time;

③ The basic situation of interference current flowing through the pipeline;

④ The direction and potential gradient of stray current in the earth along the pipeline;

⑤ The operating parameters and operating conditions of the existing cathodic protection and drainage protection devices of the pipeline itself are described.

Shandong Linyi Bosi conductive materials Co., Ltd. is a high-tech enterprise specializing in the production of MMO flexible anode, conductive polymer flexible anode and titanium coated anode, mainly providing cathodic protection technology, engineering design, installation and technical services.