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Using Scale Factors for PT/CT Ratios and Per-Unit Analysis in ProVision

Category: ProVision, PMI Products, Power Quality, PQ Data Analysis, Flex CT

Raw voltage, current, and power signals applied to a PQ recorder are often scaled versions of the true data under question. Transducers such as PTs and CTs step the voltage or current down to manageable levels. These transducers may themselves have individual calibration correction factors. Per-unit analysis involves manually scaling to a nominal reference level. Scale factors may even be able to correct for backwards CTs or other situations where a 180 degree phase shift is required. The many uses for scale factors are described here, along with the mechanism for applying them in ProVision.


This white paper includes:

  • Scale factors in Provision
  • Uses for scale factors
  • Applying PT and CT ratios to reflect primary values
  • Correcting for multiple or fractional turns through a clamp
  • Converting to per-unit values
  • Correcting for backwards CTs
  • Switching power flow direction for distributed generation

Download White Paper Here