Every industrial plant, commercial facility, and power infrastructure installation depends on transformers to step voltage up or down for safe, efficient power distribution. Inside each transformer, a dielectric fluid — commonly called transformer oil or insulating oil — performs two simultaneous and critical functions: it provides electrical insulation between the windings and the transformer tank, and it carries heat away from the core and windings to the cooling fins or radiators. The condition of this oil is directly linked to the transformer’s reliability, longevity, and safety.
Imperiea Engineering & Sourcing Pvt. Ltd. supplies Savsol Super Transol transformer oil to industrial plants, electrical maintenance contractors, power distribution companies, and switchgear maintenance teams across Pune, PCMC, Maharashtra, and beyond.
Why Transformer Oil Quality Matters — The Critical Properties
| Property | Significance | Consequence of Poor Quality |
| Dielectric Strength (BDV) | Ability to resist electrical breakdown under high voltage stress | Low BDV = risk of internal arcing, insulation failure, transformer explosion |
| Oxidation Stability | Resistance to oil degradation through heat and air contact over service life | Poor stability = rapid acidification, sludge formation, insulation degradation |
| Moisture Content (ppm) | Dissolved water in oil dramatically reduces dielectric strength | High moisture = dramatically increased breakdown risk, especially under voltage surges |
| Pour Point | Temperature at which oil stops flowing — critical for cold-start and winter conditions | High pour point = oil may solidify in outdoor transformers during cold weather |
| Interfacial Tension (IFT) | Measure of oil condition and contamination by polar degradation products | Low IFT = oil is degraded, contains acidic compounds that attack paper insulation |
| Flash Point | Minimum temperature at which vapour ignites — fire safety parameter | Low flash point = increased fire risk in transformer faults |
Savsol Super Transol — Transformer Insulating Oil
Savsol Super Transol, available through Imperiea Engineering, is a highly refined naphthenic transformer insulating oil manufactured by Savita Oil Technologies Ltd. — India’s most trusted petroleum speciality company with 60+ years of experience and the distinction of being Asia’s first carbon-positive petroleum company.
- Excellent Electrical Insulation — High dielectric breakdown voltage (BDV) meeting IS 335 / IEC 60296 requirements. Provides reliable insulation in power and distribution transformers.
- High Dielectric Strength — Consistent performance under both normal operating conditions and surge voltage events.
- Oxidation Stability — Inhibited formulation resists oxidative degradation during long service life. Maintains dielectric properties over years of transformer operation.
- Efficient Cooling Performance — Good thermal conductivity and low viscosity enable effective heat transfer from windings to radiator cooling fins.
- Moisture Resistance — Formulation characteristics minimise moisture absorption and maintain low dissolved water content in service.
IS 335 — The Indian Standard for Transformer Oil
BIS IS 335:1993 (Revised) is the Bureau of Indian Standards specification for mineral insulating oils for transformers and switchgear. Key requirements under IS 335:
- Dielectric Strength (Breakdown Voltage): Minimum 30 kV (unfiltered) / 60 kV (filtered) — Savsol Super Transol exceeds these limits.
- Moisture Content: Maximum 30 ppm (new oil) — Savsol Super Transol meets this requirement.
- Acidity: Maximum 0.03 mg KOH/g (new oil) — Low acidity protects cellulose insulation from degradation.
- Pour Point: Maximum -6°C — Suitable for winter conditions across India.
- Flash Point: Minimum 140°C (closed cup) — Savsol Super Transol exceeds minimum requirements.
Savsol Super Transol complies with IS 335, IEC 60296, and BS 148 standards — accepted by MSEDCL, MSRTC, government power departments, and private power distribution companies across Maharashtra.
When to Change Transformer Oil — Condition Monitoring Guide
- Annual oil test: BDV (breakdown voltage) — below 30 kV unfiltered indicates need for filtration or replacement.
- Acidity: above 0.1 mg KOH/g indicates significant oxidation — plan for filtration or reclamation.
- Interfacial Tension (IFT): below 20 mN/m indicates contamination with polar degradation products.
- Moisture: above 35 ppm in service oil requires immediate filtration (vacuum dehydration).
- Colour: significant darkening (above ASTM colour 4.0) indicates advanced oxidation or contamination.
- Dissolved Gas Analysis (DGA): the definitive test for detecting developing faults (partial discharge, overheating, arcing) in the transformer insulation system.
Frequently Asked Questions — Transformer Oil Pune
Q: How often should transformer oil be tested and changed?
A: For distribution transformers (11kV/0.415kV) in Indian industrial service, annual oil testing is recommended — BDV, moisture, acidity, and colour at minimum. Complete oil change is typically required every 8–15 years depending on loading, temperature, and oil quality history. Transformers with known thermal stress or previous moisture ingress should be tested more frequently.
Q: Can degraded transformer oil be reclaimed instead of replaced?
A: Yes. Oil with poor BDV but otherwise acceptable chemistry can often be reclaimed by vacuum filtration and dehydration — removing moisture, particles, and dissolved gases. Oxidised oil (high acidity, low IFT) may require reclamation through Fuller’s earth treatment. For severely degraded oil, replacement with fresh Savsol Super Transol is more economical than reclamation.
Q: Do you supply transformer oil in Nashik, Aurangabad, and other Maharashtra locations?
A: Yes. We supply Savsol Super Transol transformer oil across Maharashtra. For outstation locations outside Pune, we coordinate bulk delivery via road transport. Contact us with your location, transformer capacity, and approximate oil requirement for a delivery quote.
Q: What documentation do you provide with transformer oil supply?
A: We provide the batch test certificate (BTC) confirming compliance with IS 335 parameters, the product technical data sheet, and the material safety data sheet (MSDS/SDS). These documents are typically required by government power departments and large industrial buyers for incoming material acceptance. All documentation is available on request at the time of order.
| Get Your Lubricant Quote — Contact Imperiea Engineering Today WhatsApp Sales: +91 880 678 5151 | Phone: +91 937 101 1199 Email: sales@imperiea.com | Website: www.imperiea.com Address: Gat No. 324, Dehu-Alandi Road, IT Park Circle, Talawade, Pune – 411 062 |
