digital ratiometer / for transformers
PRT & MRT
digital, for transformers
Measuring bridge or high accuracy digital ratiometer allowing the direct measurement of the ratio and the phase error of all types of power transformers and auto-transformers (single & three phase), as well as instrument transformers CT, PT, CVT.
After more than 80 years of design and manufacturing of bridges and measuring instruments of all types, Vettiner now offers two ranges of high precision measurement devices of transformation ratio and transformers phase shift.
Historically the PRT range that has made the reputation of Vettiner for over 80 years is based on a measuring bridge based on a Weatstone Bridge allowing accuracies never reached with the current digital ratiometers. Measurement uncertainty can be reduced to 0.02% with this type of measuring bridge, which identifies where applicable, a defective coil, more or less on a transformer primary can count eg 5000 turns.
On the other hand, Vettiner developed for twenty years a range of digital ratiometers, MRT range, based on a high accuracy vector measurement of voltage and current at the transformers primary and secondary. The MRT range precisely measures ratios and phase shifts with a measurement uncertainty of less than or equal to 0.05%, allowing the identification, where applicable, of a defective coil, on a transformer primary coil that can count eg 2000 turns.