A possibility to measure power quality with RC-divider

Power quality in modern networks is becoming more and more important. The results of first measurements made with conventional instrument transformers in MV, HVE and HV networks show that frequency response is dependent on system voltage. Based on these results and the necessity of correct measurement results up to a higher frequency range, other more precise measuring systems have to be looked at. Only such equipment will be able to guarantee the correct measurement of power quality parameters up to the EHV-level. In this paper, the measurement of harmonic frequencies with a very high accuracy over a wide frequency range using a non-conventional instrument transformer is illustrated. This technology can be used for MV, HV, and also up to EHV system networks. The paper begins with a short introduction. In the next chapter the theoretical aspects are illustrated, followed. Then the physical limitations and requirements of this technology are discussed. In the following chapter international standards and the definition and calculation of accuracy are explained. Measurement results from 15Hz up to 10kHz will be illustrated and compared with measurement of conventional inductive instrument transformers.