Procedure for Calibration of Power Transformers

CVT verification consists of a resonant step-up test device composed of: variable frequency source, excitation transformer, reactor, voltage divider, capacitor, and control box.

The principle of the resonant voltage rise test device used for CVT verification: The TPXB CVT verification resonant voltage rise device must operate at a test frequency of 50Hz during calibration. Additionally, the on-site geographical conditions are complex, making it difficult for traditional experimental devices to meet the requirements for on-site transportation and testing. The TPXB CVT verification resonant voltage rise device is a tunable resonant device that was first used for on-site verification in China.

Series Resonant Test Device Test Object: Widely Used DomesticallyField calibration of capacitive voltage transformers for 500kV and below.

Series Resonance

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Series Resonant Function

Output voltage and current waveforms are excellent, distortion less than 0.5%.

2. The required capacitance is small, with the power capacity needed being 1/Q of the test capacity, where Q can be achieved between 20 to 60.

3. No overvoltage protection is required. When the test sample is punctured, the system becomes out of tune, and the resonant high voltage vanishes. The reactor then immediately limits the short-circuit current, preventing further damage to the test sample.

4. The device is designed for easy on-site handling, being a dry-type combined series resonant unit composed of an excitation transformer and multiple resonant reactors. Each individual component is compact in size and lightweight.

5. The protection functions are comprehensive, including zero-point protection (preventing system startup when the voltage output control knob is not at zero), over-voltage protection, over-current protection, and arc protection, ensuring the reliability of the system.