IEEE PC57.141

New IEEE Standard - Active - Draft.
Power transformers are vital equipment in power systems. Winding deformation being the main cause for the decrease of short-circuit withstand and mechanical stability for transformers is shown by statistics and research. The vibration test involves the measurement and analysis of the vibration signals on the transformer tank surface, which is a method to detect, monitor, and evaluate the winding deformation of energized transformers. The execution and evaluation methodology of vibration tests, applicable for oil-immersed power transformers rated above 66 kV, are described by this guide.

This guide provides guidance for the detection, monitoring, and evaluation of winding deformation in liquid-immersed power transformers based on the vibration test. This guide applies to the vibration test of oil-immersed power transformers rated above 66 kV.
The theoretical basis, instrument configuration, safety precautions, sensor arrangement, operating condition indexes, vibration characteristic quantities, and evaluation method are included in this guide. Additional materials related to the vibration test, such as typical vibration spectrums, optimal arrangement method, vibration test cases, research on winding condition threshold, and bibliography, are described in annexes.
The purpose of this guide is to recommend a winding deformation diagnostic method based on the vibration test for energized transformers in order to reduce the risk of its unexpected failures and unplanned outages caused by winding deformation.