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References

We carried out work in the area of diagnosis, power quality and analyis for our customers.

 

Competences in the area of diagnosis

  • Numerous measurements of the capacitance and dissipation factors for bushing
     
  •  Numererous executions of electrical measurements for the dignosis of transformers (in case of commissioning as well as for explaining errors). The following measurements were taken for most of the jobs:
    • Transformation ratio
    •  Winding resistance
    • Dynamic winding resistance
    • Isolation resistance
    • Capacitance and dissipation factor (CH, CHL, CL, etc.)
    • Frequency response
    • Dielectric responsert
       
  • Analysis of oil samples (supported by a partner company)
     
  • Partial discharge measurements of  transformers
     
  • Diagnostic tests of power converter

Competences in the area of power quality

  • Verifying the accuracy of power quality requirements
     
  • Verifying the accuracy of PMUs (Phase Measurement Units)
  • Time-synchronous recording of analog and digital signals in a power plant (speed, pressure, currents, etc.) for the verification of the behavior during power line reset
     
  • Research project to investigate the accuracy of the measurement of harmonics via the capacitive tapping of bushings
     
  • Research project to determine the requirements of a more accurate  measuring systemfor the measurements of harmonics via the capacitive tapping of bushings
     
  • Measurement of current harmonics up to 9 kHz via a Rogowski coil
     
  •  Measurement of the frequency-dependent transmission behavior of voltage transformers

Competences in the area of analysis

  • Frequency-dependent modeling of bushings to investigate the accuracy of the measurement of harmonic via the capacitive tapping of busings
     
  •  Consulting service in the area of HVDC:
    • Review of technical documentation on the subject of loss-determination of VSC converter stations
    • Accompaniment of characterization tests of semiconductor elements