Criteria for the Interpretation of Data for Dissolved Gases in Oil from Transformers (A Review)

The influence of the periodicity of diagnostic measurements on the operational state of high-voltage transformers is considered. Examples of defects of switching devices of converter transformers and methods for their detection are given. The rationale for the importance of recognition of defects at an early stage of their occurrence is given. The influence of the multiplicity of overvoltages on the service life of converter transformers in the aluminum industry is investigated. Based on the analysis of the service life of converter transformers of one of the powerful aluminum plants, where 83% of converter transformers have exhausted their standard service life, it is shown that in 40% of cases it would be possible to avoid their failures, with timely detection and elimination of emerging defects. Examples of defects of OLR (on-load regulators) of converter transformers and methods for their detection are given. The importance of recognition of defects at an early stage of their occurrence is substantiated. A method for chromatographic analysis of dissolved gases in transformer oil has been developed for the qualitative determination of defects and ways to eliminate them. Examples of diagnostics of converter transformers at operating voltage and working load are given, providing the best quality operational characteristics of converter transformers. The periodicity of diagnostic measurements and the reduction of defects and failures has been substantiated. The question of diagnosing the state of the converter transformer TDNP-40000/10 at an enterprise of the aluminum industry is investigated. Currently, diagnostic methods are being developed based on chromatographic analysis of dissolved gases in transformer oil. The presented method of evaluating the operating parameters of transformers allows for the safe operation of high-voltage transformers and enables to increase the reliability of the power supply scheme of aluminum industry plants.

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DYNAFLEX VAC-ARC

Alloy Digest ◽

10.31399/asm.ad.ts0144 ◽

1991 ◽

Vol 40 (12) ◽

Keyword(s):

High Temperature ◽

Physical Properties ◽

Tensile Properties ◽

High Strength ◽

Heat Treating ◽

Dissolved Gases ◽

Steel Company ◽

Vacuum Melting ◽

Temperature Performance ◽

Ingot Structure

Abstract DYNAFLEX VAC-ARC steel is a medium alloyed, air hardening ultra high strength grade. It is produced by consumable electrode vacuum melting which provides superior cleanliness, elimination of dissolved gases and preferred ingot structure. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance as well as heat treating. Filing Code: TS-144. Producer or source: Latrobe Steel Company. Originally published as Dynaflex, February 1964, revised December 1991.

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