| Abstract [eng] |
The theme of master work is actual because quality of electric energy is the main rate influencing the activity of the company and the quality of its work conditions. Standard LST EN 50160 at this moment is the essential document which describes the main characteristics of voltage and to keep to them electric energy could be called qualitative. Voltage characteristics were measured at the company in the system of low voltage using the device which helps to fix the main electric energy characteristics that is frequency, size of voltage, blinking, downfalls, intermissions, dissymmetric, harmonic voltage. Done measurements show that there are enlarged harmonic levels, especially of the third, fifth, seventh and eleventh harmonics. It is recommendable in the system of the company to perform periodically electric energy quality tests. The survey shows, that high THD worsens the activity of the company, increases losses of the energy, exacerbates work conditions in the company. On purpose to avoid increased levels of harmonics it is recommended to mount filters of harmonics. |
