Specialty Lubricants & Process Oils
TECHNOFLUID TRANSFORMER OIL
Insulating Oil
TECHNOFLUID Transformer Oil is a high-quality insulating mineral oil specially refined for use in electrical transformers and switchgear.
Exhibits excellent dielectric strength, thermal stability, and oxidation resistance, ensuring reliable electrical insulation and efficient heat dissipation.
Manufactured from carefully selected base stocks and processed to achieve high purity, low moisture content, and low sulphur levels.
Designed to provide long service life while maintaining insulation performance under continuous electrical and thermal stress.
Suitable for use in both new transformers and top-up of existing units (subject to compatibility checks).
Key Benefits
High dielectric strength ensures reliable electrical insulation.
Excellent heat transfer properties aid in efficient cooling of transformer windings.
Superior oxidation stability reduces sludge formation and extends oil life.
Low moisture content minimizes risk of electrical breakdown.
Non-corrosive and compatible with transformer construction materials.
Helps maintain transformer efficiency and reduce maintenance frequency.
Applications
Recommended for use in:
Power and distribution transformers
Instrument transformers
Oil-filled circuit breakers
Switchgear and other oil-filled electrical equipment
Suitable for indoor and outdoor electrical installations.
Typical Uses
Electrical insulation and cooling medium in high-voltage equipment.
Systems requiring stable performance under continuous electrical load.
New installations as well as maintenance and replacement applications.
Performance Standards
Meets or exceeds:
IS 335 : 2018
IEC 60296
ASTM D3487 (where applicable)
Operating Characteristics
Maintains stable dielectric and thermal properties over prolonged service life.
Low gassing tendency under electrical stress.
Compatible with commonly used transformer materials and sealing systems.
Specifications
| Characteristics | Test Method | Test Method | Typical Figures |
|---|---|---|---|
| Appearance | Visual | Clear & Bright | Clear & Bright |
| Colour | ASTM D1500 | ≤ 0.5 | ≤ 0.5 |
| Base Oil Type | — | Highly Refined Mineral | Highly Refined Mineral |
| Density @ 29.5°C, g/ml | ASTM D4052 | 0.80 – 0.85 | 0.80 – 0.85 |
| Kinematic Viscosity @ 40°C, cSt | ASTM D445 | ≤ 12.0 | ≤ 12.0 |
| Kinematic Viscosity @ 100°C, cSt | ASTM D445 | ≤ 3.0 | ≤ 3.0 |
| Viscosity Index | ASTM D2270 | ≥ 95 | ≥ 95 |
| Flash Point (COC), °C | ASTM D92 | ≥ 140 | ≥ 140 |
| Pour Point, °C | ASTM D97 | ≤ -6 | ≤ -6 |
| Neutralization Value, mg KOH/g | ASTM D664 | ≤ 0.01 | ≤ 0.01 |
| Moisture Content, ppm | ASTM D6304 | ≤ 30 | ≤ 30 |
| Breakdown Voltage (BDV), Kv | IS 6792 / IEC 60156 | ≥ 60 | ≥ 60 |
| Interfacial Tension @ 27°C, mN/m | ASTM D971 | ≥ 40 | ≥ 40 |
| Copper Corrosion (3 hrs @ 100°C) | ASTM D130 | 1a | 1a |
| Oxidation Stability (Sludge), % wt | IEC 61125 | ≤ 0.1 | ≤ 0.1 |
| Oxidation Stability (Acidity), mg KOH/g | IEC 61125 | ≤ 0.1 | ≤ 0.1 |
| Sulphur Content (Corrosive) | ASTM D1275B | Non-Corrosive | Non-Corrosive |
| Dielectric Dissipation Factor (Tan δ @ 90°C) | IEC 60247 | ≤ 0.005 | ≤ 0.005 |
| Ash Content, % wt | ASTM D482 | ≤ 0.01 | ≤ 0.01 |
| PCB Content | IEC / EPA | N | N |