Electromagnetic voltage transformers play a crucial role in electric energy metering systems found in power plants and substations. The precision of these devices directly impacts the interests of power generation, transmission, and distribution. To ensure accuracy, it is essential to periodically verify electromagnetic voltage transformers using specialized testers. However, as voltage levels increase—especially when the primary voltage exceeds 110 kV—the weight and complexity of traditional verification equipment like voltage regulators, boosters, and standard transformers grow exponentially. This makes on-site testing increasingly challenging. In response to these challenges, the Shanxi Machinery Research Institute introduced an innovative method in the 1980s for calculating high-voltage transformer errors. This method relies on the error at a low-voltage reference point and the variation curve of the primary excitation current, known as the "low-high school height" principle. It has since become a valuable tool in high-voltage transformer verification. Despite its widespread use in substation and transformer testing environments, the low-level high-voltage transformer field calibrator lacks standardized calibration specifications. This absence hinders its broader adoption and trust in its measurement results. Therefore, developing a reliable calibration method for such instruments is essential to ensure their accuracy and traceability. One commonly used approach in China is the indirect comparison method for calibrating voltage transformer field calibrators. This involves using both a low-level high-voltage field calibrator and a conventional differential pressure device, following specific wiring configurations (as shown in Figure 1 and Figure 2) for a given PT (the comparison sample). The difference between the two measurements is taken as the result. However, due to variations in accuracy levels, compensation types, stability, and actual load conditions, different laboratories often produce inconsistent results for the same calibrator, which can affect the reliability of the calibration process. To improve consistency and accuracy, further research into standardized calibration procedures is necessary. By refining these methods, we can enhance the performance and trustworthiness of modern voltage transformer testing tools, ensuring they meet the demands of today’s complex power systems.
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