Analysis of Induced Voltage on Pipeline Located Close to Parallel Distribution System

Gas and oil pipelines are widely used to supply customers. They are often laid in parallel with high voltage power lines, sharing right of way. When the pipeline is located near overhead high-voltage power, corrosion caused by induced voltages from AC power lines can occur in utility pipelines. Therefore, the calculation of induced voltage is always required for both interference and maintenance workers as well as pipeline facility safety. For parallel distribution lines, the calculation method for the induced voltage is not suitable due to the excessive error caused by using the screening factors of the neutral current. For a more practical analysis of the induced voltage, a new analysis is needed using the actual neutral current and which also considers the overhead ground conductor and the neutral conductor. This paper analyzed the induced voltage from a parallel distribution system using Carson’s formula and vector analysis. Simulation analysis results are verified by separate Electromagnetic Transient Program (EMTP) simulation.

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Surface-Integrated Electric Field Sensor for the Detection of High-Voltage Power Lines

Sensors ◽

10.3390/s21248327 ◽

2021 ◽

Vol 21 (24) ◽

pp. 8327

Author(s):

Gunbok Lee ◽

Jeong-Yeon Kim ◽

Gildong Kim ◽

Jae Hee Kim

Keyword(s):

Electric Field ◽

Electric Fields ◽

High Voltage ◽

Strong Electric Field ◽

The Body ◽

Power Lines ◽

Induced Voltage ◽

Electric Field Sensor ◽

Field Sensor ◽

High Voltage Power Lines

When a drone is used for inspection of facilities, there are often cases in which high-voltage power lines interfere, resulting in the drone being caught or falling. To prevent this type of incident, drones must be capable of detecting high-voltage power lines. Typically, a strong electric field is formed around the high-voltage lines. To detect the electric fields around high-voltage lines, this study proposes an electric field sensor that may be integrated within the body of a drone. In a laboratory environment, a voltage of 25 kV was applied to an overhead line, and the induced voltage in the proposed sensor was measured at various electric field intensities. Over an electric field range of 0.5 to 10.1 kV/m, a voltage of 0 to 0.77 V was measured with each proposed sensor. In addition, the electric field and the voltage induced in the sensor were measured in a real-world railway environment with overhead lines. Under these conditions, the proposed sensor has the compensated value of 4.5 when the measured electric field was 4.05 kV/m. Therefore, the proposed sensor may be applied in drones to measure large electric fields and to detect the presence of high-voltage lines in its vicinity.

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Induced electromagnetic field on underground metal pipelines running parallel to nearby high voltage AC power lines

E3S Web of Conferences ◽

10.1051/e3sconf/201910702004 ◽

2019 ◽

Vol 107 ◽

pp. 02004

Author(s):

Giovanni Dushimimana ◽

Patrobers Simiyu ◽

Vedaste Ndayishimiye ◽

Emile Niringiyimana ◽

Sefu Bikorimana

Keyword(s):

Electromagnetic Field ◽

High Voltage ◽

Short Circuit ◽

Power Lines ◽

Induced Voltage ◽

Steady State Condition ◽

Ac Power ◽

Safe Limits ◽

Adjacent Soil ◽

Gradient Control

High voltage AC (HVAC) power lines can induce significant amount of voltages on underground gas/oil metal pipelines in areas where they share similar Right of Way (RoW), the situation becoming serious particularly in case of fault conditions. Electromagnetic field generated by the HVAC power lines on these pipelines, generate unwanted voltages which present threats to the pipeline and its associated protective equipment such as cathodic systems. The aim of this research is to compute induced voltage on pipeline running parallel to HVAC power lines. The study was conducted using CDEGS software package and revealed that under steady state condition, results were in agreement with GB 6830-1986 standard. However, high currents are generated under single phase to ground short circuit rising the potential of adjacent soil including the underground pipeline beyond limits. Therefore, the gradient control wire mitigation technique is proposed to reduce these voltages to safe limits.

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