Power Transformer Condition Management Program for Oil and Gas Industrial Facilities

This paper presents the lessons learned and challenges faced during the development and implementation of a transformer condition assessment program at a large oil and gas company. A methodology was developed to identify the condition of large power transformers that are due for replacement or have a risk of failure and require immediate action to rectify. This was achieved by a rational application of assessment criteria and ranking mechanisms. The transformer condition assessment program helps to minimize capital expenditures by using cost-effective alternatives that will extend the economic life of a power transformer. This paper focuses on evaluating aged power transformers (over 20 years old) through an advanced assessment program, which mainly consists of a two-level criteria scoring system. This will allow proactive action of flagging end of life, expediting mitigations, monitoring, and reporting the state of critical power transformers, which can be implemented on conservator type oil-immersed power transformers. A case study is also presented in this paper.