Investigation of mechanical load during live line working on high voltage power lines

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Supervisor:
Dr. Németh Bálint
Department of Electric Power Engineering

As the main topic of my thesis, I investigate whether it is allowed in a given arrangement of conductors to move from one conductor to another in the vertical direction during Live Line Working (LLW), as well as if the line car could be utilized between two phase conductors. In order to do the concrete calculations, I built a computational model.

In the first half of my thesis, I review the Italian TERNA LLW method and the transmission towers of the domestic 400 kV transmission grid. After this, I review the national electrical safety regulations that relate to Live-Working, and introduce a device which is able to control and limit worksite over-voltages. Assuming the use of this device, I recalculate the required electrical safety distances according to IEEE 516 and IEC 61472 standards. In the second half of my thesis I summarize the applied mathematical equations for the shape of the conductor, and the impacts on the wire from a concentrated load. At the end of my thesis, I introduce the operation of the developed model that automatically performs the required electrical and mechanical calculations after the data are fulfilled. Using data from a Hungarian 400 kV line section, while also results of a real sag measurement, I performed different calculations to see how tower shapes affect the capability of the discussed LLW technologies.

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