Paryol Electra 7426® is an advanced dielectric insulating oil designed and developed with the aim of minimizing the environmental impact. This product exhibits noticeable differences if compared with any other insulating liquid marketed since the beginning of the transformers technology.
Paryol Electra 7426® is based on a peculiar mixture of vegetable oils, able to cuple excellent dielectric characteristics with stability at high temperature.
Moreover, its flash and fire point are much higher than these of any other standard mineral oil, meeting the specifications listed inTable 1 of the Standard IEC 60296 Ed IV (2012).
The chemical nature of the product also allows an excellent compatibility with the materials adopted to build the transformer, on the other hand granting a prompt biodegradability. 98% of the product biodegrades within 21 days from the beginning of the exposure to the environment.
Paryol Electra 7426® is moreover non-toxic to humans and animals. Even the small amount of specific additives, mixed with the vegetable oils in order to enhance their oxidation stability, doesn't affect their safety (due to their FDA approval).
Paryol Electra 7426® has distinct advantages over other high temperature dielectric fluids with fire and flash points well above 300 °C. Factory Mutual approval as "less flammable" fluid has already been requested.
Paryol Electra 7426® has more than 50 times water solvency than traditional mineral oils. This property reduces the migration of water into the paper that insuates the wires. It will therefore degrade at a lower rate than with mineral olis.
Paryol Electra 7426® has a Dielectric Dissipation Factor (DDF - tg δ) similar to traditional mineral oil, but during service this factor incereases at a slower rate.
Paryol Electra 7426® has a maximum of 1.5% additives, that preserve its dielectric characteristics.
The gases produced because of arcing in the bulk of Paryol Electra 7426® do not contain polycyclic aromatic hydrocarbons, usually associated with arcing phenomena in the case of petroleum-based media. Anyway, CO, CO2, H2, and a small amount of non-saturated short-chain hydrocarbons will still be present.
Paryol Electra 7426® is totally free, by definition, from sulphur and, as mentioned above, from PAH. This feature is fundamental in order to preserve the environment and to protect the operators' health.
The figure compares the behavior of Paryol Electra 7426® and 3 other vegetable oils on the market, running oxidation tests for 48, 72 and 168 hours respectively.
The aim of the longest test is to providealso an useful comparison with the IEC 61125C standard, traditionally adopted to evaluate the oxidation stability of insulating mineral oils (oils defined by IEC 60296).
Viscosity comparison between different vegetable oils after oxidation test.
On April 6th 2016, at the Scuola di Formazione Operativa of Rome Montelibretti Vigili del Fuoco (Fire Fighters) a comparative self-extinguishment test between different dielectric fluids for transformers has been carried out. Representatives from Vigili Del Fuoco, University La Sapienza (Rome), Enel, Terna, Acea, Ispra (Ministry of Environment), Inail and A&A Fratelli Parodi Spa attended the meeting. A mineral dielectric oil, Paryol Electra 7426 and another market leader dielectric fluid were tested sequentially.
Test results showed that:
- MINERAL DIELECTRIC OIL is not self-extinguishable. Its combustion produces considerable amounts of dark smoke
- PARYOL ELECTRA 7426 has a very short self-extinguishment time; Its combustion produces a small amount of clear smoke.
- The vegetable dielectric oil of a Market Leader has self-extinguishment properties less immediate than Paryol Electra 7426; Its combustion produces considerable amount of dark smoke