of the School of Electrical and Electronic Engineering ) at The University of Manchester, is at the forefront of research in this discipline in the UK and internationally. The Group is very strong in many aspects of high voltage engineering. One of their particular areas of expertise covers all the technical issues related to the application of novel insulating materials in power systems, including new alternative transformer insulating liquids.

I The cooperation project with The University of Manchester assessed the performances of Jarylec® GA based on three criteria: gassing tendency, partial discharge, and AC breakdown voltage. Can you explain these results and the conclusions you reached?

J.W. – The results we obtained confi rm that the addition of Jarylec® GA turned the gas-evolving ability of the mineral oil being studied into an absorbing one. The direct effect of the Jarylec® GA additive is a suppression of the partial discharge activity in both mineral oil and ester liquid. Moreover, Jarylec® GA additives will keep the oil breakdown strength under AC voltage.

I According to the test, what proportion of Jarylec® GA should be added to transformer oil for optimum effi ciency?

J.W – According to the IEC60628 standard method, 8% Jarylec® GA in both mineral oil and ester liquid will bring the gassing tendency down by minimum 100% depending on the oil, which corresponds to 30 µL/min.

I Can Jarylec® GA be added to dielectric liquid in service transformers?

J.W. – Absolutely so. Jarylec® GA is fully miscible with mineral oils, and in this case can extend the lifetime of the transformer.

I As one of the main benefi ts, you said that Jarylec® GA can lower maintenance costs for manufacturers and users. Did you evaluate the cost savings that can be generated during the lifetime of a transformer?

J.W. – Yes, we did. Jarylec® GA is currently being tested in real-life operating electrical equipment. Primary results are positive, and long-term data should be available and published shortly.

Jarylec® GA is a new specialty oil designed for enhancing the durability of classic mineral oils used in transformers. Its gas-absorbing properties induce lower maintenance costs for transformers and greater safety and effi ciency. Recent technical tests conducted with Prof. Zhongdong Wang of The University of Manchester produced some excellent performance results, confi rming the fi rst standard IEC tests carried out 3 years ago by Arkema. Explanations from Jeremie Walker, an Arkema Researcher specializing in dielectric liquids.

JARYLEC® GA

A new scientifi cally tested alternative dielectric liquid for transformers

I Arkema will exhibit at CIGRE 2012.

Come and meet with Jarylec® specialists in booth no. 321 / Level 3.Technical paper D1-107 summing-up will be presented at D1-PS1 Dielectric performance and ageing of insulating materials.

If you require further information, please contact:jeremie.walker@arkema.comTel: + 33 (0)4 72 39 80 51or: didier.juhue@arkema.com

I What is Jarylec® GA and what does it actually bring as an additive in transformers?

Jeremie Walker – Jarylec® GA is a blend of benzyltoluene isomers, a non-classifi ed synthetic oil presenting no hazard to health or the environment, and which by its chemical nature is fully compatible with mineral oils.Including Jarylec® GA as an additive to transformer oil helps minimize partial discharges which cause the formation of gas and the electro-chemical breakdown of the mineral oil. Any build-up of gas promotes persistent partial discharges, and can also lead to a risk of insulation breakdown and a risk of fi re. By absorbing the gas, Jarylec® GA considerably reduces the partial discharges while minimizing the risk of explosion and fi re. Finally, resistance to electrical fi elds and heat transfer are also improved.

I You carried out some experimental studies with The University of Manchester, which has a renowned School of Electrical and Electronic Engineering. Why this collaboration?

J.W. – The Electrical Energy & Power Systems Group, ( part

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