Corona noise – Option high-voltage lines: Shaping the energy revolution with IMMI
During the operation of high-voltage overhead power lines, noise emissions occur which are, in the technical literature, referred to as corona noise. In the context of approval procedures for the operation of overhead power lines, the computational prognosis of noise immissions plays a central role. As a rule, length-related sound power levels of the individual conductor cables are calculated as a function of the respective boundary field strength using semi-empirical formulas, and the conductor cables are each entered into the calculation model as a line sound source.
In order to design the implementation of the complex conductor rope geometries in IMMI, a macro was developed which allows the modeling of high-voltage overhead power lines in a convenient and realistic way.
With the macro, line sound sources are generated based on the pylon and conductor cable geometry (incl. sag) and entered into the calculation model. With the additional representation of pylons and grounding cables, the route can then be traced in detail in the 3D model. Thus, IMMI is also prepared for the energy revolution and supports users with a user-friendly tool.
Currently, a basis for the assessment of corona noise is being created with the development of a draft in Germany DIN VDE preliminary standard on the subject of "Corona noise on high-voltage overhead power lines". In addition to the general description of the symptomatology of the development of corona noise, the topics of prognosis and measurement are dealt with in detail. Thus, with the development of the preliminary standard, a document is being planned that is intended to create a uniform framework for dealing with corona noise on high-voltage overhead power lines, in which the company Wölfel Engineering is also involved.