An Improved Magnetic Field Method to Locate the Grounding Conductor

Area of Science:

• Electrical Engineering
• Geophysics
• Corrosion Science

Background:

• Accurate grounding grid conductor location is essential for effective corrosion diagnosis and maintenance in power substations.
• Existing methods may lack precision in identifying unknown grounding grid configurations.

Purpose of the Study:

• To develop an improved magnetic field differential method for locating unknown grounding grids.
• To analyze and mitigate errors associated with higher-order magnetic field derivatives.

Main Methods:

• Utilized a magnetic field differential method incorporating truncation and round-off error analysis.
• Determined conductor positions by analyzing the peak values of different magnetic field derivative orders.
• Derived an index of peak position error to quantify localization accuracy.

Main Results:

• Demonstrated that different orders of magnetic field derivatives can pinpoint grounding conductor positions.
• Quantified the impact of truncation and rounding errors on higher-order differentiation.
• Established a method to determine the optimal measurement step size for improved accuracy.

Conclusions:

• The proposed method offers a robust approach for locating unknown grounding grids.
• Error analysis is crucial for optimizing measurement parameters and ensuring accurate conductor identification.
• This technique enhances the efficiency of corrosion diagnosis and maintenance in power substations.