Description:BACKGROUND
[0001] Embodiments of the present disclosure relate to dielectric fluids, and more particularly, to a dielectric fluid composition.
[0002] Dielectric fluid insulation system is an integral part of power transformers, switchgears, capacitors, switches, and many other extra high voltage or ultra-high voltage equipments. Apart from its primary functions such as cooling, insulation, arc quenching, the dielectric fluid also performs the major diagnostic role as an information carrier for dissolved gas analysis and furan analysis. It also performs the role of heat transfer by cooling the various sub systems in the equipment.
[0003] Further, the Capacitor plays a critical role in the transmission & distribution system. The Capacitor is installed to compensate for the reactive power flow in the transmission system. Also, the capacitor ensures stability in the system voltage and reduces losses in the transmission. Capacitor is made up of two metallic plates separated with a dielectric material such as Polypropylene film and Kraft paper in between the plates and is impregnated with environmentally compatible dielectric fluid to eliminate partial discharges.
[0004] Further, conventional dielectric fluids used for capacitors are made from various mixtures like synthetic ingredients such as benzylated toluene and dibenzylated tolune mixtures or benzylated toluene and 1,1-diphenylethane mixtures or any other mixture. The conventional dielectric fluids are hazardous to handle and also have obnoxious odor. The handling of these fluids poses risk.
[0005] Dielectric fluid’s ability to function efficiently and effectively depends on number of properties. The number of properties includes but not restricted to flash point, gas absorption, thermal conductivity, viscosity over a range of temperatures, heat capacity, dielectric breakdown voltage, impulse breakdown voltage, power factor, pour point and others. The International Standards Organizations such as the American Society for Testing and Materials (ASTM), the International Electrotechnical Commission (IEC), the British Standard (BS) and the German Standard DIN specifications use a combination of these properties to provide standard to be strictly adhered to.
[0006] The dielectric fluids require exceptional long term stability to withstand extended periods of severe thermo-electric stress. As the dielectric fluid ages capacitance comes down, resistance to oxidation will come down causing degradation progressively evolving, acids, sludge, gasses etc.
[0007] The performance of extra high voltage or ultra-high voltage equipment’s such as bushings , instrument transformers, capacitors and cables is affected by the presence of degradation products like volatile gasses, which can give rise to frequent partial discharges, breakdown of insulation and possibly the risk of explosion.
[0008] The gas absorbing property of a dielectric fluid has been recognized as an important factor in characterization. Although the currently available compositions of the dielectric fluids adhere to the International Standards like IEC 60867:1993, they are hazardous, environmentally unfriendly. The composition of the dielectric fluids can be further improved by improving the negative gassing tendency to offer a longer service life for the good of various extra high voltages and ultra-high voltage equipment’s and also reduces maintenance costs.
[0009] Hence, to overcome at least one of the above mentioned deficiencies, there exists a need for an improved dielectric fluid composition with improved gassing tendency.

SUMMARY
[0010] This summary is provided to introduce a selection of concepts, in a simple manner, which are further described in the detailed description of the invention. This summary is neither intended to identify key or essential inventive concepts of the subject matter, nor to determine the scope of the invention.
[0011] In an embodiment of the present disclosure, a dielectric fluid composition having improved gassing tendency has been disclosed. The composition comprises a type A base oil composition, a type B base oil composition and one or more additives selected from an additive package present by weight in a percentage range of about 0% to 4% of the total weight of the dielectric fluid. Also, the dielectric fluid has a negative gassing tendency in a range of about -150 mm3/minute to -160 mm3/minute.
[0012] In another embodiment of the present disclosure, a dielectric fluid composition having improved gassing tendency has been disclosed. The composition comprises a type A base oil composition comprises a synthetic base oil 1 present by weight in a percentage range of about 0% to 70% of the total weight of the type A base oil, a synthetic base oil 2 present by weight in a percentage range of about 5% to 70% of the total weight of the type A base oil, a synthetic base oil 3 present by weight in a percentage range of about 0% to 15% of the total weight of the type A base oil and a base oil 4 present by weight in a percentage range of about 0% to 12% of the total weight of the type A base oil. Also, the type B base oil composition further comprises a synthetic base oil 1a present by weight in a percentage range of about 0% to 70% of the total weight of the type B base oil, a synthetic base oil 2a present by weight in a percentage range of about 5% to 70% of the total weight of the type B base oil, a synthetic base oil 3a present by weight in a percentage range of about 0% to 15% of the total weight of the type B base oil and a base oil 4a present by weight in a percentage range of about 5% to 12% of the total weight of the type B base oil.
[0013] To further clarify the advantages and features of the present invention, a more particular description of the invention will follow by reference to specific embodiments thereof, which are illustrated in the appended tables. It is to be appreciated that these tables depict only typical embodiments of the invention and are therefore not to be considered limiting in scope. The invention will be described and explained with additional specificity and detail with the appended tables.

DETAILED DESCRIPTION
[0014] For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the tables and specific language will be used to describe them. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended. Such alterations and further modifications in the illustrated system, and such further applications of the principles of the invention as would normally occur to those skilled in the art are to be construed as being within the scope of the present invention.
[0015] It will be understood by those skilled in the art that the foregoing general description and the following detailed description are exemplary and explanatory of the invention and are not intended to be restrictive thereof.
[0016] The terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process or method that comprises a list of steps does not include only those steps but may include other steps not expressly listed or inherent to such a process or method. Similarly, one or more devices or sub-systems or elements or structures or components preceded by "comprises... a" does not, without more constraints, preclude the existence of other devices, sub-systems, elements, structures, components, additional devices, additional sub-systems, additional elements, additional structures or additional components. Appearances of the phrase "in an embodiment", "in another embodiment" and similar language throughout this specification may, but not necessarily do, all refer to the same embodiment.
[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention belongs. The system, methods, and examples provided herein are only illustrative and not intended to be limiting.
[0018] Embodiments of the present invention will be described below in detail with reference to the accompanying tables.
[0019] Embodiments of the present disclosure relate to a dielectric fluid composition having improved gassing tendency has been disclosed. The composition comprises a type A base oil composition, a type B base oil composition and one or more additives selected from an additive package present by weight in a percentage range of about 0% to 4% of the total weight of the dielectric fluid. Also, the dielectric fluid has a gassing tendency in a range of about -150 mm3/minute to -160 mm3/minute.
[0020] The composition comprises a type A base oil composition comprises a synthetic base oil 1 present by weight in a percentage range of about 0% to 70% of the total weight of the type A base oil, a synthetic base oil 2 present by weight in a percentage range of about 5% to 70% of the total weight of the type A base oil, a synthetic base oil 3 present by weight in a percentage range of about 0% to 15% of the total weight of the type A base oil and a base oil 4 present by weight in a percentage range of about 0% to 12% of the total weight of the type A base oil.
[0021] Further, the type B base oil composition further comprises a synthetic base oil 1a present by weight in a percentage range of about 0% to 70% of the total weight of the type B base oil, a synthetic base oil 2a present by weight in a percentage range of about 5% to 70% of the total weight of the type B base oil, a synthetic base oil 3a present by weight in a percentage range of about 0% to 15% of the total weight of the type B base oil and a base oil 4a present by weight in a percentage range of about 5% to 12% of the total weight of the type B base oil.
[0022] Further to the above disclosure. the synthetic base oil 1 of the type A base oil comprises a paraffinic carbon present by weight in a percentage range of about 5% to 12% of the synthetic base oil 1, a naphthenic carbon present by weight in a percentage range of about 10% to 15% of the synthetic base oil 1 and an aromatic carbon present by weight in a percentage range of about 75% to 85% of the synthetic base oil 1.
[0023] Further, the synthetic base oil 2 of the type A base oil comprises a naphthenic carbon present by weight in a percentage range of about 5% to 10% of the synthetic base oil 2, a paraffinic carbon present by weight in a percentage range of about 10% to 15% of the synthetic base oil 2 and an aromatic carbon present by weight in a percentage range of about 75% to 85% of the synthetic base oil 2.
[0024] Further in accordance with the above disclosure, the synthetic base oil 3 of the type A base oil comprises a naphthenic carbon present by weight in a percentage range of about 1% to 5% of the synthetic base oil 3, a paraffinic carbon present by weight in a percentage range of about 0% to 2% of the synthetic base oil 3 and an aromatic carbon present by weight in a percentage range of about 95% to 99% of the synthetic base oil 3. Also, the base oil 4 of the type A base oil comprises a natural ester.
[0025] Further in accordance with the another embodiment of the disclosure, the synthetic base oil 1a of the type B base oil comprises a naphthenic carbon present by weight in a percentage range of about 10% to 15% of the synthetic base oil 1a, a paraffinic carbon present by weight in a percentage range of about 5% to 12% of the synthetic base oil 1a, and an aromatic carbon present by weight in a percentage range of about 75% to 82% of the synthetic base oil 1a.
[0026] Also, the synthetic base oil 2a of the type B base oil comprises a naphthenic carbon present by weight in a percentage range of about 5% to 10% of the synthetic base oil 2a, a paraffinic carbon present by weight in a percentage range of about 10% to 15% of the synthetic base oil 2a and an aromatic carbon present by weight in a percentage range of about 75% to 85% of the synthetic base oil 2a.
[0027] Further, the synthetic base oil 3a of the type B base oil comprises a naphthenic carbon present by weight in a percentage range of about 1% to 5% of the synthetic base oil 3a, a paraffinic carbon present by weight in a percentage range of about 0% to 2% of the synthetic base oil 3a and an aromatic carbon present by weight in a percentage range of about 95% to 99% of the synthetic base oil 3a. Also, the base oil 4a of the type B base oil comprises a dioctyl phthalate.
[0028] Further with respect to the above embodiments. The synthetic base oil 1 of the type A base oil has a boiling range of greater than or equal to 330°celsius. The synthetic base oil 2 of the type A base oil has a boiling range of greater than or equal to 300°celsius. The synthetic base oil 3 of the type A base oil has a boiling range of greater than or equal to 350°celsius.The base oil 4 of the type A base oil has a boiling range of greater than or equal to 550°celsius.
[0029] Furthermore, the synthetic base oil 1a of the type B base oil has a boiling range of greater than or equal to 330°celsius. The synthetic base oil 2a of the type B base oil has a boiling range of greater than or equal to 300°celsius. The synthetic base oil 3a of the type B base oil has a boiling range of greater than or equal to 350°celsius. The base oil 4a of the type B base oil has a boiling range of greater than or equal to 380°celsius.
[0030] Further with respect to the above embodiments The one or more additives selected from the additive package comprises at least one from the group of an oxidation inhibitor, an anti-gassing agent, a pour point depressant, an anti-foaming agent, a scavenger and the combinations thereof.
[0031] Furthermore, the one or more additives selected from the additive package comprises at least one from the group of an oxidation inhibitor present in a percentage range of about 0.08% to 0.4% of the additive package, an anti-gassing agent present in a percentage range of about 0% to 1% of the additive package, a scavenger present in a percentage range of about 0.01% to 1% of the additive package; and the mixtures thereof.
[0032] The test results for the type A base oil composition of the dielectric fluid composition of the present disclosure as per the IEC60867 standards have been disclosed below in table 1. The results disclosed in Table 1 showed that the composition is in full compliance with IEC 60867 specification limits. The kinematic viscosity of the type A base oil composition at 40°celsius is about 6.2 mm2/s. The breakdown voltage of the type A base oil composition is about 81 kV. The dielectric dissipation factor (Tan Delta) of the type A base oil composition is about 0.00151. The Stability under electrical stress and ionization (Gassing Absorption) is about -151mm3/minute. The Pour point of the type A base oil composition is about -69°C. The Flash point of the type A base oil composition is about 150°C. The Volume resistivity at 90°C for type A base oil is about 0.68TO-m.
TABLE 1
Sl.No CHARACTERISTICS Sub Clause IEC 60867
Specification
Limits Type A Base Oil composition
1. Appearance 6.1 Clear & free from suspended matters Complies
2. Density @ 20°C 6.2 0.950 – 1.000 0.872
3. Kinematic Viscosity
@ 40°C, mm2/s 6.3 7 (Max) 6.2
4. Flash Point, °C 6.4 140°C (Min) 150°C
5. Pour Point, °C 6.5 -40°C (Max) -69°C
6. Neutralization Value, mg KOH/g 6.6 0.03 (Max) Nil
7. Chlorides 6.7 30 (Max) Nil
8. Water Content, ppm 6.8 100 (Max) 10
9. Corrosive Sulphur 6.9 Non-corrosive Non-corrosive
10. Breakdown voltage, gap 2.5mm, kV 6.10 30 (Min) 81
11. Volume resistivity @ 90°C, TO-m 6.11 0.5 (Min) 0.68
12. Dielectric Dissipation factor Tan delta @ 90°C, 40-60Hz 6.11 0.002 (Max) 0.00151
13 Stability under electrical stress and ionization (Gassing)
Absorption (mm3/min) 6.12
Method A -100 (Min) -151
[0033] The additional properties of type A base oil composition of the dielectric fluid composition for example is disclosed in the below table 2. The boiling range of the type A base oil composition is greater than or equal to 300°Celsius that improves the safety. The rotating vessel oxidation property test results for type A base oil composition shows a time range of about 431 minutes that leads to the excellent oxidation resistance. The type A base oil composition of the dielectric fluid composition also leads to the faster cooling of the equipment. The Biodegradability, OECD 301B, CO2 Evolution Test shows a result of greater than 60% that makes the fluid to be environmental friendly. The compatibility (miscibility) of the present dielectric fluid composition is good with other dielectric fluids such as natural esters and synthetic esters that make the fluid easy to handle.
TABLE 2
Properties Results of Type A Base Oil composition Remarks
Boiling range, °C >300 °C Safe to Handle
RVOT, Minutes 431 Excellent Resistance to Oxidation
Odour Sweet Safe to handle
Handling Safe Non-etching & Safe to handle
Biodegradability, OECD 301B, CO2 Evolution Test Readily Biodegradable (>60% ) Environmentally Friendly
Miscibility with other Dielectric Fluids Fully miscible with Other mineral oils, natural esters & synthetic Esters Ease to Handle
[0034] Further, the test results for comparison of the type A base oil composition with the market-1 dielectric fluid is given below in the Table 3. The kinematic viscosity at 40 degree Celsius of type A base oil composition is around 6.2 mm2/s. Similarly the kinematic viscosity at -40 degree Celsius of type A base oil composition is around 390 mm2/s. The pour point of the type A base oil composition is around -69 degree Celsius which is far superior as compared to -50 C of Market-1 dielectric fluid. The tan delta at 90 degree Celsius of the type A base oil composition is around 0.00151 when compared to 0.0039 of the market 1 dielectric fluid. Also, the Resistivity at 90 °C for type A base oil composition is around 0.68 TO-m when compared to 0.51 TO-m of the market 1 dielectric fluid. Further, the flash point of the type A base oil composition is around 150 degree Celsius when compared to 144 degree Celsius of the market 1 dielectric fluid.
TABLE 3
Characteristics Type A Base Oil composition Market-1 dielectric fluid
Kinematic Viscosity, mm2/s
At 40 °C, 6.2 3.5
At -40 °C, 390 247
Pour Point, °C -69 -50
Tan Delta at 90 °C 0.00151 0.0039
Resistivity at 90 °C TO-m 0.68 0.51
Dielectric Constant 2.27 2.66
Flash Point 150 144
[0035] Further, the test results for comparison of the type A base oil composition with the market-1 dielectric fluid is given below in the Table 4. The kinematic viscosity at 40 degree Celsius of type A base oil composition is around 6.2 mm2/s. Similarly the kinematic viscosity at -40 degree Celsius of type A base oil composition is around 390 mm2/s. The pour point of the type A base oil composition is around -69 degree Celsius is excellent when compared to -63 of the market 2 dielectric fluid. The tan delta at 90 degree Celsius of the type A base oil composition is around 0.00151 when compared to 0.04 of the market 2 dielectric fluid. Also, the Resistivity at 90 °C for type A base oil composition is around 0.68 TO-m when compared to 0.5 TO-m of the market 2 dielectric fluid. Further, the flash point of the type A base oil composition is around 150 degree Celsius when compared to 139 degree Celsius of the market 2 dielectric fluid.
TABLE 4
Characteristics Type A Base Oil composition Market-2 dielectric fluid
Kinematic Viscosity, mm2/s
At 40 °C 6.2 2.7
At -40°C 390 219
Pour Point, °C -69 -63
Tan Delta at 90 °C 0.00151 0.04
Resistivity at 90 °C TO-m 0.68 0.50
Dielectric Constant 2.2 2.44
Flash Point 150 139
[0036] The test results for the type B base oil composition of the dielectric fluid composition of the present disclosure as per the IEC60867 standards have been disclosed below in table 5. The results disclosed in Table 5 show that the composition is in full compliance with IEC 60867 specification limits. The kinematic viscosity of the type B base oil composition at 40°celsius is about 6.8 mm2/s. The breakdown voltage of the type B base oil composition is about 80 kV. The dielectric dissipation factor (Tan Delta) of the type B base oil composition is about 0.00155. The Stability under electrical stress and ionization (Gassing Absorption) is about -160mm3/minute. The Pour point of the type B base oil composition is about -69°C. The Flash point of the type B base oil composition is about 153°C. The Volume resistivity at 90°C for type B base oil is about 0.75 TO-m.
TABLE 5
Sl.No CHARACTERISTICS Sub Clause IEC 60867
Specification
Limits Type B Base Oil composition
1. Appearance 6.1 Clear & free from suspended matters Complies
2. Density @ 20°C 6.2 0.950 – 1.000 0.876
3. Kinematic Viscosity, mm2/s
@ 40°C, 6.3 7 (Max) 6.8
4. Flash Point, °C 6.4 140°C (Min) 153°C
5. Pour Point, °C 6.5 -40°C (Max) -69°C
6. Neutralization Value, mg KOH/g 6.6 0.03 (Max) Nil
7. Chlorides 6.7 30 (Max) Nil
8. Water Content, ppm 6.8 100 (Max) 10
9. Corrosive Sulphur 6.9 Non-corrosive Non-corrosive
10. Breakdown voltage, gap 2.5mm, kV 6.10 30 (Min) 80
11. Volume resistivity @ 90°C, TO-m 6.11 0.5 (Min) 0.75
12. Dielectric Dissipation factor Tan delta @ 90°C, 40-60Hz 6.11 0.002 (Max) 0.00155
13 Stability under electrical stress and ionization (Gassing)
Absorption (mm3/min) 6.12
Method A -100 (Min) -160
[0037] Further, the test results for comparison of the type B base oil composition with the market-1 dielectric fluid is given below in the Table 6. The kinematic viscosity at 40 degree Celsius of type B base oil composition is around 6.8 mm2/s. Similarly the kinematic viscosity at -40 degree Celsius of type B base oil composition is around 395 mm2/s. The pour point of the type B base oil composition is around -69 degree Celsius is far superior as compared to -50 of the market-1 dielectric fluid. The tan delta at 90 degree Celsius of the type B base oil composition is around 0.00155 when compared to 0.0039 of the market-1 dielectric fluid. Also, the Resistivity at 90 °C for type A base oil composition is around 0.75 TO-m when compared to 0.51 TO-m of the market-1 dielectric fluid. Further, the dielectric constant of the type A base oil composition is around 2.42, when compared to 2.66 of the market-1 dielectric fluid.
TABLE 6
Characteristics Type B Base Oil composition Market-1 dielectric fluid
Kinematic Viscosity, mm2/s
At 40 °C, 6.8 3.5
At -40 °C, 395 247
Pour Point, °C -69 -50
Tan Delta at 90 °C 0.00155 0.0039
Resistivity at 90 °C TO-m 0.75 0.51
Dielectric Constant 2.42 2.66
[0038] Further, the test results for comparison of the type B base oil composition with the market-2 dielectric fluid is given below in the Table 7. The kinematic viscosity at 40 degree Celsius of type B base oil composition is around 6.8 mm2/s. Similarly the kinematic viscosity at -40 degree Celsius of type B base oil composition is around 395 mm2/s. The pour point of the type B base oil composition is around -69 degree Celsius is superior when compared to -63 of the market-2 dielectric fluid. The tan delta at 90 degree Celsius of the type B base oil composition is around 0.00155 when compared to 0.04 of the market-2 dielectric fluid. Also, the Resistivity at 90 °C for type A base oil composition is around 0.75 TO-m as compared to 0.51 TO-m of the market-2 dielectric fluid. Further, the dielectric constant of the type B base oil composition is around 2.42, when compared to 2.66 of the market-2 dielectric fluid.
TABLE 7
Characteristics Type B Base Oil composition Market-2 dielectric fluid
Kinematic Viscosity, mm2/s
At 40 °C 6.2 2.7
At -40°C 390 219
Pour Point, °C -69 -63
Tan Delta at 90 °C 0.00151 0.04
Resistivity at 90 °C TO-m 0.68 0.50
Dielectric Constant 2.2 2.44
Flash Point 150 139
[0039] The compatibility results with construction materials for the dielectric fluid composition of the present disclosure are disclosed below in the table 8. The characteristics of the dielectric fluid composition after ageing for about 164 hours at 100°Celsius for control oil and aged oil is disclosed in the table below. The neutralization value of the dielectric fluid composition is about 0.001 mg KOH/g for control oil and 0.001 mg KOH/g for aged oil that leads to prevention of acid generation. The Tan delta at 100°Celsius of the dielectric fluid composition is about 0.00195 for control oil and 0.002 for aged oil that again leads to the prevention of polar compounds generation. The resistivity at 100 degrees Celsius for the base oil composition is about 0.48 TO-m for control oil and 0.384 TO-m for aged oil that again leads to prevention of polar compounds generation.
TABLE 8
Characteristics Dielectric fluid composition after ageing for 164 Hrs. at 100 °C
Control Oil Aged Oil
Colour <0.5 <0.5
Neutralization Value, mg KOH/g 0.001 0.001
Tan Delta @100 °C 0.00195 0.002
Resistivity @100 °C, TO-m 0.48 0.384
Dielectric Strength –BDV, kV 86 81
[0040] Furthermore, the dielectric fluid composition as disclosed in the present disclosure may be advantageous in providing superior dielectric properties such as lighter in density, excellent flow-ability at -40°C, excellent dielectric dissipation factor (DDF) with very low total Sulphur content that thereby increases the active life of the insulation system and Extra high voltage (EHV) or Ultra high Voltage (UHV) equipments. The improved negative gassing tendency of the dielectric fluid composition increases the service life of the liquid and the equipment in which they are used. The dielectric fluid composition delays or slows down partial discharges which will ensure good healthy liquid insulation and solid insulation. Overall the dielectric fluid composition as disclosed in the present disclosure ensures the overall reliable performance of capacitors and other Extra high voltage (EHV) or Ultra high Voltage (UHV) equipments.
[0041] It is to be understood that a skilled artisan will recognize the interchange ability of various features from different embodiments and that the various features described, as well as other known equivalents for each feature, may be mixed and matched by one of ordinary skill in this art to construct additional systems and techniques in accordance with principles of this disclosure. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention.

Claims:1. A dielectric fluid composition having improved negative gassing tendency; the composition comprises:
a type A base oil composition;
a type B base oil composition; and
one or more additives selected from an additive package present by weight in a percentage range of about 0% to 4% of the total weight of the dielectric fluid;
Wherein, the dielectric fluid has a negative gassing tendency in a range of about -150 mm3/minute to -160 mm3/minute.

2. The dielectric fluid composition as claimed in claim 1, wherein the type A base oil composition comprises:
a synthetic base oil 1 present by weight in a percentage range of about 0% to 70% of the total weight of the type A base oil;
a synthetic base oil 2 present by weight in a percentage range of about 5% to 70% of the total weight of the type A base oil;
a synthetic base oil 3 present by weight in a percentage range of about 0% to 15% of the total weight of the type A base oil;
a base oil 4 present by weight in a percentage range of about 0% to 12% of the total weight of the type A base oil.

3. The dielectric fluid composition as claimed in claim 1, wherein the type B base oil composition comprises:
a synthetic base oil 1a present by weight in a percentage range of about 0% to 70% of the total weight of the type B base oil;
a synthetic base oil 2a present by weight in a percentage range of about 5% to 70% of the total weight of the type B base oil;
a synthetic base oil 3a present by weight in a percentage range of about 0% to 15% of the total weight of the type B base oil;
a base oil 4a present by weight in a percentage range of about 5% to 12% of the total weight of the type B base oil.

4. The dielectric fluid composition as claimed in claim 2, wherein the synthetic base oil 1 comprises:
a paraffinic carbon present by weight in a percentage range of about 5% to 12% of the synthetic base oil 1;
a naphthenic carbon present by weight in a percentage range of about 10% to 15% of the synthetic base oil 1.
an aromatic carbon present by weight in a percentage range of about 75% to 82% of the synthetic base oil 1.

5. The dielectric fluid composition as claimed in claim 2, wherein the synthetic base oil 2 comprises:
a naphthenic carbon present by weight in a percentage range of about 5% to 10% of the synthetic base oil 2;
a paraffinic carbon present by weight in a percentage range of about 10% to 15% of the synthetic base oil 2; and
an aromatic carbon present by weight in a percentage range of about 75% to 85% of the synthetic base oil 2.

6. The dielectric fluid composition as claimed in claim 2, wherein the synthetic base oil 3 comprises:
a naphthenic carbon present by weight in a percentage range of about 1% to 5% of the synthetic base oil 3;
a paraffinic carbon present by weight in a percentage range of about 0% to 2% of the synthetic base oil 3; and
an aromatic carbon present by weight in a percentage range of about 95% to 99% of the synthetic base oil 3.

7. The dielectric fluid composition as claimed in claim 2, wherein the base oil 4 comprises a natural ester.
.
8. The dielectric fluid composition as claimed in claim 3, wherein the synthetic base oil 1a comprises:
a naphthenic carbon present by weight in a percentage range of about 10% to 15% of the synthetic base oil 1a;
a paraffinic carbon present by weight in a percentage range of about 5% to 12% of the synthetic base oil 1a;
a aromatic carbon present by weight in a percentage range of about 75% to 82% of the synthetic base oil 1a.

9. The dielectric fluid composition as claimed in claim 3, wherein the synthetic base oil 2a comprises:
a naphthenic carbon present by weight in a percentage range of about 5% to 10% of the synthetic base oil 2a;
a paraffinic carbon present by weight in a percentage range of about 10% to 15% of the synthetic base oil 2a; and
an aromatic carbon present by weight in a percentage range of about 75% to 85% of the synthetic base oil 2a.

10. The dielectric fluid composition as claimed in claim 3, wherein the synthetic base oil 3a comprises:
a naphthenic carbon present by weight in a percentage range of about 1% to 5% of the synthetic base oil 3a;
a paraffinic carbon present by weight in a percentage range of about 0% to 2% of the synthetic base oil 3a; and
an aromatic carbon present by weight in a percentage range of about 95% to 99% of the synthetic base oil 3a.

11. The dielectric fluid composition as claimed in claim 3, wherein the base oil 4 of Type B comprises a Dioctyl phthalate

12. The dielectric fluid composition as claimed in claim 2, wherein the synthetic base oil 1 has a boiling range of greater than or equal to 330°celsius.

13. The dielectric fluid composition as claimed in claim 2, wherein the synthetic base oil 2 has a boiling range of greater than or equal to 300°celsius.

14. The dielectric fluid composition as claimed in claim 2, wherein the synthetic base oil 3 has a boiling range of greater than or equal to 350°celsius.

15. The dielectric fluid composition as claimed in claim 2, wherein the base oil 4 has a boiling range of greater than or equal to 550°celsius.

16. The dielectric fluid composition as claimed in claim 3, wherein the synthetic base oil 1a has a boiling range of greater than or equal to 330°celsius.

17. The dielectric fluid composition as claimed in claim 3, wherein the synthetic base oil 2a has a boiling range of greater than or equal to 300°celsius.

18. The dielectric fluid composition as claimed in claim 3, wherein the synthetic base oil 3a has a boiling range of greater than or equal to 350°celsius.

19. The dielectric fluid composition as claimed in claim 3, wherein the base oil 4a has a boiling range of greater than or equal to 380°celsius.

20. The dielectric fluid composition as claimed in claim 1, wherein the one or more additives selected from the additive package comprises at least one from the group of an oxidation inhibitor, an anti-gassing agent, a pour point depressant, an anti-foaming agent, a scavenger and the combinations thereof.

21. The dielectric fluid composition as claimed in claim 1 wherein the one or more additives selected from the additive package comprises at least one from the group of:
an oxidation inhibitor present in a percentage range of about 0.08% to 0.4% of the additive package;
an anti-gassing agent present in a percentage range of about 0% to 1% of the additive package;
a scavenger present in a percentage range of about 0.01% to 1% of the additive package; and the mixtures there of the additive package.

22. The dielectric fluid composition as claimed in claim 1, wherein a kinematic viscosity at 40°celsius is in a range of about 5 mm2/s to 10 mm2/s.

23. The dielectric fluid composition as claimed in claim 1, wherein a breakdown voltage is in a range of about 70 kV to 81 kV.

24. The dielectric fluid composition as claimed in claim 1, wherein a dielectric dissipation factor at 90°Celsius is in a range of about 0.00141 to 0.00155.