Consistency analysis of earthing grid of transformer station

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Dr. Ladányi József
Department of Electric Power Engineering

The latest European Standard, EN 50522 is by this paper reviewed, which is applicable to specify the requirements for the design and erection of earthing systems of electrical installations, in systems with nominal voltage above 1 kV a.c. and nominal frequency up to and including 60 Hz.

The design of transformer stations contains the installation of earthing grid, which is very important in electrical safety and in many ways. By periodic monitorings and the part of a new earthing grids must be controlled the continuity of earthing grid and resistance. There are many reasons for damage to the erathing grids. I review the measurement of the earthing resistance by specialised literatures.

Two field tests are conducted to demonstrate that the proposed method works effectively in determining the continuity of the earthing grid. The magnetic field generated by the injection of the current into the earthing grid can be used for the identification of broken conductors.

I take part in the measurement of the earthing resistance and the continuity of the grid. In my simulation I investigate the above-mentioned things and finally I compare with the results of the measurement.


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