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1) the characteristics of stray current project is a major one underground oil pipeline, and put into use shortly, there have been perforated oil spills, Perforation of oil spills Department also visited and found that the ground is a small DC Electric Railway, the total length of 2500m, Among them, about 1000m parallel with the oil pipeline, both very close spacing, generally only a dozen meters, Some places are only 25m. In order to identify whether caused by stray current pipeline oil spills, pipeline right of the potential measurements (note : pipeline has been conducted outside insulation, glass Ribbon package deal and asphalt), the measurement results are as follows : 1. Tube-to the potential instability of the corrosion of several spots in and found the point of a potential both to fluctuate over time, 10-15min, the fluctuations can achieve the greatest number of dead. 2. Tube-to potential serious deviation from the normal (2) reduce the stray current method of the current MTR generally take the following ways to reduce the Miscellaneous San current. 1. Impedance reduce rail train running the same time as the rail traction passenger trains return, it is the smaller rail impedance. Rail outward from the loss of stray current is smaller, reducing the effective rail impedance means of a long rail, rail longer the smaller rail joints, rail impedance is small. In addition to the rail joints with fish plate bolt connection, again between the two rails with two 120mm2 above the insulation copper cable connections. 2. Traveling Rail Bearing Point used to reduce rail contact with the ground surface as well as reduce the stray current one way, Traveling this point supporting rail use, with concrete soft as a pillow bearing. 3. Insulation and to rail and rail to the better insulation, stray current is small, for the rail and concrete between the soft pillow, fastening bolts and concrete with soft pillow between the fastener and concrete soft pillow among insulation, every kilometer track collection of stray current net value of the leakage resistance greater than 10Ω. 4. Stray current installed sea MTR online collection of electric vehicles using DC power supply. Rated voltage of 1500V, rated current up to the introduction of 3000. While serving as the return of running rail and take between the insulation measures will be adopted long rail and rail welding joint of copper cables, But rail itself with resistance, when the current flow resistance at the rail on the potential difference, by rail to the insulation resistance is not infinite, there is a potential difference of stray current will be generated, that the rail lines will be a small part of the current outflow orbit, the stray current in the MTR as a "stray current." When the crowds flow into the subway tunnel structure reinforced tunnels and bad insulation on the metal pipes, frame, such as bridge, in the case of electrolytes, which will be metal equipment -- corrosion. That the MTR suboccipital the soft concrete bed set up inside stray current collection network. Stray current collection from the network, the next two rows of vertical steel bars, each row of five steel reinforced Φ12mm, Every Φ25mm 50m with a more horizontal steel to 5% of the vertical steel welding a whole, using two reinforced Φ20 mm higher, the next two lateral connecting steel welded into one, as shown in Figure 33. Arranging for the five starting reinforced addition to the collection of stray current role, had a fixed concrete soft Lichen role Porcelain Pillows Made of soft concrete advance fashions Kong, the construction of reinforced wear into. Pai under constant reinforcement in the concrete track bed Lane. Stray current collection network and the structure of reinforced tunnels between the insulation should not connected. Stray current collection network in each substation set up two first-terminal leads to the collection and measurement of stray current. (3) to prevent stray current of the above measures can greatly reduce the stray current. But inevitably there are still a small number of stray current from the concrete track bed flow within the tunnel structure of metal conductor, Failure to take these measures will stray current corrosion of metal conductor. Below introduced by the various equipment to prevent stray current methods. 1. 2 bridge cables. Power, lighting Pipe 3. Station Road 4 to drain. Station Control System 5. Digging subway stations, tunnels and rectangular circular tunnel six main structure. Other