Research on Low-frequency Voltage Transformer Calibration System and Uncertainty Analysis

LIU Fangming; QI Shuzhe; PAN Feng; LIU Hao; YANG Hong

doi:10.3969/j.issn.1000-1158.2026.04.16

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Acta Metrologica Sinica ›› 2026, Vol. 47 ›› Issue (4) : 590-596. DOI: 10.3969/j.issn.1000-1158.2026.04.16

Research on Low-frequency Voltage Transformer Calibration System and Uncertainty Analysis

LIU Fangming ¹ ,
QI Shuzhe ² ,
PAN Feng ² ,
LIU Hao ¹ ,
YANG Hong ¹

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Abstract

To complete the metrological traceability sysetm of low-frequency voltage transformers（LFVTs）， a 35 kV-class calibration system operating in the （15~30）Hz frequency range was developed. The system comprises a low-frequency voltage source， a low-frequency standard voltage transformer， and a low-frequency electronic transformer test set， enabling on-site verification of LFVTs. Experimental studies were conducted to evaluate the influence of frequency variations on the ratio error and phase displacement of voltage transformers. A prototype LFVT was calibrated using the system， followed by comprehensive uncertainty analysis. Results indicate that frequency fluctuations significantly affect both ratio error and phase displacement， highlighting the necessity of frequency-specific calibration. The proposed system is validated for calibrating LFVTs with accuracy classes of 0.5 and below.

Key words

electrical measurement / low-frequency standard voltage transformer / low-frequency voltage source / low-frequency electronic transformer test set / uncertainty analysis

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LIU Fangming , QI Shuzhe , PAN Feng , et al . Research on Low-frequency Voltage Transformer Calibration System and Uncertainty Analysis[J]. Acta Metrologica Sinica. 2026, 47(4): 590-596 https://doi.org/10.3969/j.issn.1000-1158.2026.04.16

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