The National Institute of Standards and Technology (NIST) calibration service for voltage transformers and high-voltage capacitors is described. The service for voltage transformers provides measurements of ratio correction factors and phase angles at primary voltages up to 170 kV and secondary voltages as low as 10 V at 60 Hz.
Calibrations at frequencies from 50–400 Hz are available over a more limited voltage range. The service for high-voltage capacitors provides measurements of capacitance and dissipation factor at applied voltages ranging from 100 V to 170 kV at 60 Hz depending on the nominal capacitance.
Calibrations at frequencies from 50-400 Hz are avail- able over a more limited voltage range. The service for high-voltage capacitors provides measurements of capacitance and dissipation factor at applied voltages ranging from 100 V to 170 kV at 60 Hz depending on the nominal capacitance.
The most accurate capacitor calibrations have an uncertainty of ±25 ppm for capacitance and an un- certainty of ±5xlO~* for dissipation factor. For capacitors with large dissipation factors, the dissi- pation factor uncertainty is generally at least ±1% of the measured value ±5X 10~*.
In our case, the capacitor is connected to the LCR meter via a 0.61 m cable. The calibration interpolation factor, Kc = 0, because all of the measurements are taken at direct calibration frequencies. The cable length factor, Kd = 0.00025(1 + 50fm), for the calibration interpolation factor is given for a cable length of 1 m.
For example, power factor capacitors often have relatively stable dissipation factors but have capacitances that vary significantly with applied voltage (even demonstrating hysteresis effects) and temperature. In this case a calibration of dissipation factor would be meaningful.
An accurate on-site calibration system for electronic voltage ...
DOI: 10.1088/1361-6501/aaa6a0 Corpus ID: 116712121; An accurate on-site calibration system for electronic voltage transformers using a standard capacitor @article{Hu2018AnAO, title={An …
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An accurate on-site calibration system for electronic voltage ...
[5] Li Z, Li H, Zhang Z, Luo P, Li H and Zhang W 2014 High-accuracy online calibration system for electronic voltage transformers with digital output Trans. Inst. Meas. …