Summary
This paper presents a relatively new method called total gas pressure (TGP) for air ingress type leak detection of the sealed preservation systems in power transformers. Through timely detection of leaks, it is possible to react early and better protect the transformer from excess oxygen, which can increase insulation degradation through oxidation. Since the method has been previously published and presented the basic principles of the method are only shortly reiterated. In short it allows for continuous monitoring of the total sum of partial pressures of all the dissolved gases in the transformer insulating liquid, which results in a pressure value that can be continuously measured in conjunction with other dissolved gas analysis (DGA) by a
Read more Read lessDGA monitor utilizing vacuum extraction. The operation and function of TGP is demonstrated with laboratory tests and reference measurements and the benefits of its use are explained. Due to total gas pressure not yet being as widely recognized within the industry, some new general guidance for its use in practice is provided in this paper. This guidance is based on experience with the method and real-world practical cases and should be broadly applicable to different types of sealed preservation systems. In addition, the paper presents potential disadvantages of the more traditional method of using dissolved oxygen concentration as an indicator of leaks in the context of power transformers filled with natural ester insulating liquids. The paper explains how TGP can be a more reliable indicator for these cases.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | D1_11377_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Finland |
| Study committees | |
| File size | 887 KB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
MELLIN Toni - Vaisala Oyj
