Generally, inductive (wound) VTs are used for high
equency measurements in preference to capacitor voltage
ansformers (CVTs) which are tuned for use at powerfrequency [1], as it is acknowledged that CVT accuracy is
compromised away from the rated frequency [2]. A
comparison of 300kV and 132kV VTs used on the Norwegian
power system [3] found that, at low harmonic orders, the
frequency response varied significantly for the CVTs,
whereas the response of inductive VTs was approximately
flat to around the 29th
harmonic (1.45 kHz). At the 29th
harmonic, the largest measured VT error for the various VTs
surveyed was 14% [3].