研究目的
To describe the setup and initial measurements of a sampling-based ratio bridge for calibrating voltage transformers, highlighting its advantages over traditional methods.
研究成果
Initial measurements indicate that the sampling-based ratio bridge can achieve uncertainties below 2 ppm for the ratio error and 0.5 μrad for the phase displacement of voltage transformers, suggesting its effectiveness for calibrating voltage transformers with different ratios.
研究不足
The study acknowledges potential effects due to stray magnetic fields around the core and capacitive effects that may deteriorate the estimated errors. Further verification is needed to confirm the bridge's performance across all intended applications.
1：Experimental Design and Method Selection:
The study employs a sampling-based ratio bridge for calibrating voltage transformers, focusing on comparing transformers with different ratios.
2：Sample Selection and Data Sources:
Voltage transformers (VTs) with varying transformer ratios are used, with measurements taken at different voltages and frequencies.
3：List of Experimental Equipment and Materials:
Includes a two-channel sampling system (NI 9239), voltage transformers (A) and (B), and an inductive voltage divider.
4：Experimental Procedures and Operational Workflow:
The bridge measures the complex voltage ratio between the secondary windings of the standard transformer and the transformer under test, adjusting nominal divider ratios to prevent overloading and achieve a ratio close to one.
5：Data Analysis Methods:
The ratio error and phase error of the transformer under test are calculated based on the measured complex voltage ratio.
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