Correcting Systematic Errors in Corona Losses Measured With Phasor Measurement Units

This letter proposes a method to correct systematic errors in corona losses calculated from synchronized phasor measurements, without the need to calibrate the entire measurement chain. Earlier work has shown that phasor measurement units can be applied in monitoring of corona losses; however, the results can be affected by systematic errors introduced by uncalibrated instrument transformers. Due to the complexity and cost of calibrating existing installations, this letter proposes a procedure to approximate the systematic errors with a simplified model instead. Application of the method has been demonstrated on real measurement data.