Benchmarking between the different techniques of oil treatment during the life cycle of oils and transformers
Download the flier PDF: Sea Marconi Treatments Vs Fuller Earth treatments ENG (377.5 KiB)
|
Key Factors |
DMU & Integrated Treatments* |
Treatment with typical Fuller Earth |
Treatment with |
| Recovery: Physical Properties KV, DGA, H2O |
Yes |
Yes |
Yes |
| Recovery: Chemical Properties TAN, DF, IFT |
Yes |
Yes |
Yes |
| Removal: DBDS & Corrosive Sulfur |
Yes |
No |
No |
| Decontamination: Dissolved Metals |
Yes |
No |
No |
| Dehalogenation: PCBs/POPs in Oils |
Yes |
No |
No |
| Classification: BAT/BEP – Best Available Techniques/Best Environmental Practices (PCBs/POPs) |
Yes |
No |
No |
| Self-cleaning unit from: DBDS, PCBs/POPs |
Yes |
No |
No |
| Cross contamination by DBDS, PCBs/POPs |
Safety |
Danger |
Danger |
| Corrosion by Sulfur Degradation byProducts (SDBP) as H2S, Mercaptans, etc. due to high temperature (> 370 °C – typical 600-700 °C) |
Safety |
Safety |
Danger |
| Dioxins Emissions (PCDDs, PCDFs) due to high temperature degradation byproducts from PCBs/POPs and halogenated contaminants in Oils |
Safety |
Safety |
Danger |
*CDP Process® for PCBs/POPs chemical dehalogenation; CHEDCOS for DBDS & Corrosive Sulfur Selective Depolarization
Example of Case history: «C3 – SDBP & Corrosive Sulfur»
URUGUAY 2010
Post Failure diagnosis on a Grid Transformer showed signs of electric arcs on tap selector contacts. The failure has been caused by the formation of Corrosive Sulphides as CuS, Cu2S, Ag2S, etc. Indeed «At relatively high temperature, sulphur-containing oil molecules may decompose and react with metal surface to form metal sulphides» (IEC 60422 Ed. 4 – 2013 art. 5.17). This mechanism started together with the oil regeneration process with reactivation of sorbent and fuller earth column by uncontrolled combustion (> 370 °C). The Sulfur Compounds naturally present (DiBenzoThioPhene – DBTP, etc.) in the Oil and additives (DBDS, etc.) are decomposed in Sulfur Degradation ByProducts. Other Ref. National Grid (UK), ABB (Sweden), 2010 Doble Conference (USA)
Sustainable Solutions by Sea Marconi – Added Value for Customers, Holders & Partners:
- 45 years of Innovation for Life Cycle Management of Oils & Transformers;
- Solutions based on Global and Integrated Approach, Case histories, State of the Art, IEC Standards, CIGRE Guidelines, Stockholm Convention on POPs (Persistent Organic Pollutants);
- Opportunity for prevention and/or mitigation of losses and risks for the asset, workers, public health and environment;
- Focus on hot topics and priorities for strategic electrical equipment filled with insulating fluids;
- Diagnosis (> 150,000 cases) and Integrated Treatments (> 700 Power Transfos – 2012) with DMU (25 Decontamination Mobile Units), guarantee independent expertise, reliability, quality control (ISO 9001-2008, ACCREDIA ISO 17025), traceability, economic benefits, environmental protection, social, stakeholders and insurance relationship.
