This company was founded in order that various experts in our industry would have a way to provide this specialized knowledge to customers that need it. Our expertise ranges from transformer manufacturing and testing expertise for transformers up to 1000MVA and 765kV. We can perform detailed factory audits, active part inspections prior to tanking, factory acceptance testing (FAT) witness, failure investigations, LTC and field testing expertise, etc. We can also provide electrical system design expertise to optimize substation or other systems being contemplated for the most economical solutions. D4 represents Cargill's FR3 natural ester transformer fluids and NatureCool fluid for datacenter server blade immersion technology. Each of these technologies provides an economical "Green" solution that is environmentally friendly and technically superior to other options. D4 also represents the global Oil Processing, Regeneration and Testing Equipment manufacturer GlobeCore. GlobeCore is a leader in the global supply of this equipment that can provide significant benefits to the extension of transformer life and conservation of resources via regeneration of transformer oil.