Voltage transformer frequency response. Measuring harmonics in Norwegian 300 kV and 132 kV power systems

Conference Paper · November 1998with178 Reads
DOI: 10.1109/ICHQP.1998.760148 · Source: IEEE Xplore
Conference: Harmonics And Quality of Power, 1998. Proceedings. 8th International Conference on, Volume: 2

    Abstract

    Measuring harmonics in high voltage power systems with inductive
    and in particular capacitive voltage transformers, CVTs, may cause large
    errors. Test carried out by The Norwegian National Grid Company
    (Statnett), Bergenshalvoens Kommunale Kraftselskap (BKK) and The
    Norwegian Electric Power Research Institute (now SINTEF Energy Research)
    revealed errors from 80% to +1200% (0,2-12 pu) of correct values.
    Inductive voltage transformers did have a relatively small error up to
    29<sup>th</sup> harmonic (1450 Hz) while capacitive voltage transformers
    had large errors at a few hundred Hz. Carrying out calibration tests on
    voltage transformers and capacitive voltage transformers in particular
    may correct most of the errors. Still inductive voltage transformers
    should be preferred for harmonic measurements where possible