Distribution Network Operator (DNO) Report Writing, Factory Acceptance Tests (FAT) & Dissolved Gas Analysis (DGA) - Engineering Assignment Help

Assignment Task

Assessment Brief
Background Information
Five years ago, a Distribution Network Operator (DNO) in Japan ordered and subsequently installed ten transformers of the same type and from the same supplier. At the time of the procurement, all Factory Acceptance Tests (FAT) and other relevant tests were successfully completed under the guidance and observation of a third-party consulting engineer’s representative alongside a team from the DNO. The ten transformers were sited in five substations across a range of locations on the Japanese mainland. A year after the installation was completed the company, PoWinTran, which manufactured the transformers went into liquidation and all technical documentation was discarded. Unfortunately, due to administrative negligence, the DNO has also lost all internal structure and compliance certification associated with the transformers. The maintenance and monitoring of the assets under the stewardship of the DNO has been unplanned and as a routine test method, Dissolved Gas Analysis (DGA) is not carried out on 132kV transformers so there is no historical data.
Additional Information
In February 2021 gas was collected, as part of a random sampling test, from the transformer JC2, see Table 1. Following analysis of the sample subsequent DGA tests were then carried out on all transformers. The results are presented in their entirety in the format of Table 1 and are available for you to download from Blackboard.

Transformer Detail
ONAN
132/66kV with OLTP
90 MVA
X = 5%
 

Table 1 – DGA Results (Use your individual results available on Blackboard)
 

Task
There is a concern from the senior engineers within the asset management team that there may be a common fault in all of the transformers. As the newest member of the team, after relocating to Japan, you have been allocated this project and you need to investigate the nature and scope of the problem. At a hastily arranged meeting, the discussion resulted in the following questions requiring a response:

• Is there a problem
• What is the nature of the problem?
• Is it with one transformer?
• Is there anything to suggest a type of problem
• Can the transformers remain in service?
• Will the problem escalate
• What are the possible consequences?

By utilizing appropriate methods, you should identify the nature of any problems which may be occurring in one or more of the transformers. You should also consider the DGA results from the other transformers and draw appropriate conclusions as to whether or not there are problems with the other transformers, and whether it is the same type of problem.

As a result of your findings, you should make recommendations to the team regarding

• The next steps to be taken
• The further diagnostic and analytical study may help to confirm your findings
• Whether any investigative or corrective work can be undertaken on site.

Learning Outcomes Assessed 

Personal and Transferable Skills
1) Critically apply numerical skills to problems involving asset management systems.
2) Communicate clearly, fluently, and effectively in a professional manner.

Research, Knowledge and Cognitive Skills
3) Integrate and synthesize asset management knowledge in a specialized process/application.
4) Devise new/alternative solutions to changing asset signatures.
5) Demonstrate a comprehensive and critical understanding of the principles underlying the need for an asset management policy.

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