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IEEE C57.125-2015 pdf free

IEEE C57.125-2015 pdf free.IEEE Guide for Failure Investigation,Documentation, Analysis,and Reporting for Power Transformers and Shunt Reactors.
This guide recommends a procedure to be used to perform and document a failure analysis and the reporting and statistical analysis of reliability of power transformers and shunt reactors used on electric power systems.
This document is intended to provide a methodology by which the most probable cause of any particular transformer failure may be determined by applying the scientific method to investigations; provide sufficient guidelines, examples, and case histories to promote uniformity in the analysis of transformer failures; encourage the establishment of routine and uniform data ollection so that valuable facts are not lost or destroyed; encourage consistency of nomenclature and compatibility with similar efforts by other organizations (Examples include but not limited to CIGRE, EEI, IEC, NEMA, NERC, and AEIC); and encourage cooperative efforts by users and manufacturers during the failure analysis.
cylinder: A tube that provides radial support andor insulation for the inner winding and insulation for the outer windings.
defect: Imperfection or partial lack of performance that can be corrected without taking the transformer out of service.
end frames: Thick steel slabs forming a frame to provide beam strength to restrain the rectangular coil or structural forms forming a frame to provide beam strength to restrain the circular coil. They also provide structural support for the coil supports and clamping plates.
end support: Axial support.
failure: The termination of the ability of a transformer to perform its specified function. In the study of power transformer reliability, it is oflen difficult to distinguish between major and minor failures; therelare, the following terms for failure are given: failure with forced outage. failure with scheduled outage. and defect.
failure analysis: The logical, systematic examination of an item or its diagram(s) to identify and analyze the probability, causes, and consequences of potential and real failure.
failure cause: The circumstances during design. manufacture, or use that have led to failure. Also called root cause.
failure mode: The manner in which failure occurs; generally categorized as electrical, mechanical. thermal, and contamination.
failure rate: The ratio of the number of failures with forced outages of a given population over a given period of time, to the number of accumulated service years for all transformers in that population over the same period of time.
NOTE—Thc failure rate defined here is composed of failures with forced outages. This is used for statistical analysis in system mathematical studies. Other reports may be made using failure with scheduled outages and defects, Tabulation of scheduled outages and defects needs to be aggressively pursued from the standpoint of reliability improvement. It should be recogniicd that reliability improvement is ditTeren 1mm reliability measurement. Quantitative, mathematically correct, reliability measurement can only be acconiplished by counting liiilures with a forced outage. Reliability improvement, on the other hand, can be acconiplished through tabulating and reporting a wide variety of problems.
failure with forced outage: Failure of a transformer that requires its immediate removal from service. This is accomplished either automatically or as soon as switching operations can be pcrtbrmcd.
failure with scheduled outage: Failure for which a transformer is deliberately taken out of service at a selected time by operator action.
focused tests: Tests performed to identify a particular area of failure.
hoop tension: The stretching force that acts on a coil in the circumferential direction.IEEE C57.125 pdf free download.

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