IEEE C57.12.90-2021 PDF Download

The IEEE C57.12.90-2021 standard provides detailed methods for conducting tests on liquid-immersed distribution, power, and regulating transformers. It serves as a guide for performing various tests specified in IEEE Std C57.12.00 and other relevant standards. The standard covers a wide range of tests including resistance measurements, polarity and phase-relation tests, ratio tests, no-load loss and excitation current measurements, impedance and load loss measurements, dielectric tests, temperature tests, short-circuit tests, audible sound level measurements, and calculated data.

However, it is important to note that this standard excludes certain types of transformers such as instrument transformers, step-voltage and induction voltage regulators, arc furnace transformers, rectifier transformers, specialty transformers, grounding transformers, and mine transformers. The specific requirements and test criteria for transformers are not included in this standard but can be found in other appropriate standards or user specifications.

The main purpose of this standard is to provide test procedures and guidelines for conducting tests on liquid-immersed distribution, power, and regulating transformers. It serves as a reference for ensuring the proper performance and testing of these transformers in accordance with established standards.