Calibration of impulse high-voltage test systems above 500 kV peak: implementation and evaluation

Area of Science:

• Electrical Engineering
• Metrology

Background:

• Modern impulse high-voltage testing equipment operates at unprecedented voltage levels.
• Conventional calibration methods are inadequate for these advanced high-voltage systems.

Purpose of the Study:

• To develop and validate an on-site calibration method for impulse high-voltage testing equipment up to 800 kV.
• To address the limitations of traditional calibration techniques for high-voltage ranges.

Main Methods:

• Utilized two standard dividers for impulse voltage (up to 500 kV peak) and DC charging voltage (up to 100 kV).
• Introduced an efficiency factor technique for calibration extending beyond 500 kV peak.
• Employed a normalized error approach for comparison and verification.

Main Results:

• Achieved excellent linearity across all calibration points, with linearity error below 1%.
• Successfully validated calibration extension up to the 800 kV peak range.
• Ensured the unit under calibration met specified accuracy standards.

Conclusions:

• The proposed on-site calibration method is effective and reliable for impulse high-voltage testing equipment.
• The technique provides accurate and uncertainty-evaluated results, meeting industry standards.
• This approach enables precise calibration for advanced 800 kV systems.