FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2006
Provisional Specification
(See section 10 and rule 13)
TITLE OF THE INVENTION
Transformer insulation with polymer concrete


APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400030, Maharashtra, India, an Indian Company
INVENTORS
K Baburao, Crompton Greaves Ltd, Condition Monitoring and Diagnostic Centre (CMDRC), CG Global R&D Centre, Kanjur Marg (East), Mumbai 400042,
Maharashtra, India, an Indian national
PREAMBLE TO THE DESCRIPTION
The following specification describes the invention


The invention relates to composition having enhanced insulation and low generation of furanic compounds in transformers by biodiesel and polyesterimide with polymer concrete to retard generation of furanic compounds
High voltage transformers (Dry, Power) are widely used for the transmission of electricity to increase the voltage of generated power or to decrease the transmission voltage down to low voltage levels for household or industrial applications. Typically the transmission voltage for this range of transformers is 10,0.00 to 20,000 volts, though higher voltages up to 36 kV may be used, providing more efficient transmission, other factors permitting.
Polyesters are widely used for electrical insulation; they have relatively balanced properties in mechanical properties, heat resistance, price, etc. But polyester cannot fully satisfy recent demands for (1) improvement in heat resistance for miniaturization and weight saving or increasing reliability of electric machines and devices, (2) improvement in wear (abrasion) resistance for rationalization of production of coils, (3) improvement in thermal (heat) shock resistance for shortening the heating time of impregnated varnishes, (4) improvement in resistance to hydrolysis in response to an increase of closed type machines and devices, (5) these are not withstand for higher temperature insulation etc. As modified unsaturated polyesters for meeting these demands, there are proposed a resinous encapsulating material for encapsulation of electrical products

US4710796 discloses A resin encapsulation type semiconductor device having a semiconductor element and a resinous encapsulating material for encapsulating said semiconductor element therein and Curing held at higher temperature (170 Deg C - 180 Deg C) , this leads to undue stresses in the casting and leads to failure of insulating medium by way of cracking, loss of reactive diluent etc.
EP1764807 discloses compact transformer comprising one or more solid materials for insulating at least some of the conductive parts and a liquid for both insulating at least some of the conductive parts and for heat transfer and cooling, wherein the solid material comprises a high temperature insulation material (Aramid, Polyesterimide, Polyester and epoxy glass) Teflon, and the liquid comprises a biodegradable, fire safe, high temperature coolant (Pentaerythritol fatty acid ester, Synthetic ester, Agricultural ester) which can be used for voltage levels above 36kV. None of the prior art was not disclosing using of polymer concrete (polyesterimide with additives) with biodiesel for encapsulation of transformers
Accordingly the invention provides a composition having enhanced insulation and low generation of furanic compounds in transformers by polyesterimide with polymer concrete with additives to retard generation of furanic compounds
In one embodiment, the invention provides biodiesel with polymer concrete (unsaturated polyesterimide, styrene, MEKP, fillers (A1203, Si02...)) as insulating media to transformer

In one embodiment, the invention provides polymer concrete composition containing Polyesterimide resin, Styrene Monomer, Silane, Pigment, Silica Fillers(Si02) from 800 Microns to 40 microns range, Aluminium Trihydroxide (ATH),Alumina (A1203), Rutile (Ti02) and MEKP(hardener) with biodiesel as encapsulant for transformers
In a further embodiment, the invention provides encapsulating composition having polymer concrete along with biodiesel (Karanjia Oil and of Jatropha Oil) and Styrene Monomer, Silane, Pigment, Silica Fillers(Si02) from 800 Microns to 40 microns range, Aluminium Trihydroxide (ATH),Alumina (A1203), Rutile (Ti02) and MEKP(hardener)
The encapsulating composition for transformers, said composition comprises biodiesel and polymer concrete (polyesterimide with additives). Said composition enhances the insulation properties and provides low furanic compounds generation during aging of transformer at higher temperatures
The encapsulating composition for transformers, the said composition comprises biodiesel, selected from Karanjia Oil and of Jatropha Oil and Polymer concrete, selected from Polyesterimide resin, Styrene Monomer, Silane, Pigment, Silica Fillers(Si02) from 800 Microns to 40 microns range, Aluminium Trihydroxide (ATH),Alumina (A1203) ,Rutile (Ti02) and MEKP(hardener)
The encapsulating composition for transformers, Process involves First distillation of biodiesel and filtered through activated fullers earth column, the treated biodiesel aged with polyesterimide polymer concrete slats and kraft paper and thermally upgraded paper

insulated conductor coils. Transformer aged at 140 - 160 degree Celsius temperature for 500 hours in sealed tubes, The samples were tested for degree of polymerization and for oil parameters

(Ivan Bernard Fuller)
of Khaitan & Co
Agent for the Applicants
Dated this 19th day of March 2009