About Transformer Oil - Apar Power Oil

APAR POWEROIL Transformer Oils by APAR Industries is a premium range of high-performance insulating and cooling oils specially developed for power and distribution transformers. Manufactured since 1969, APAR POWEROIL products are widely used across utilities, power plants, transmission networks, renewable energy projects, railways, and industrial electrical systems in more than 125 countries. The oils are engineered to deliver excellent dielectric strength, oxidation stability, thermal conductivity, and long transformer life.

APAR offers mineral transformer oils, natural ester oils, synthetic ester oils, inhibited and uninhibited grades, and ultra-high voltage approved oils that comply with major international standards including IEC, IS, ASTM, DIN, and CIGRE specifications.

Key Specifications

Main Applications

Power Transformers

Used in power transmission and distribution transformers for insulation and cooling.

Distribution Transformers

Suitable for utility and industrial distribution transformers operating under varying load conditions.

Ultra High Voltage (UHV) Transformers

Approved for 765 kV AC, 800 kV HVDC, and 1200 kV AC transformer applications.

Renewable Energy Systems

Used in solar farms, wind farms, and offshore renewable energy installations.

Railway Electrification

Applied in railway traction transformers and substation equipment.

Industrial Electrical Equipment

Used in switchgears, reactors, circuit breakers, and heavy electrical systems.

Marine & Indoor Installations

Fire-resistant ester grades are suitable for marine, metro, tunnel, indoor, and environmentally sensitive locations.

Functions of Transformer Oil

Electrical Insulation

Transformer oil acts as an insulating medium between transformer components and prevents electrical breakdown.

Heat Dissipation

Absorbs heat generated inside the transformer and transfers it to cooling radiators or external cooling systems.

Arc Suppression

Helps suppress arcing and corona discharge during switching or overload conditions.

Moisture Protection

Prevents moisture contamination and protects paper insulation inside transformers.

Oxidation Control

High oxidation stability minimizes sludge formation and extends transformer life.

Equipment Protection

Protects transformer windings and core from overheating, corrosion, and deterioration.

Benefits of APAR POWEROIL Transformer Oil

Longer Transformer Life

Superior oxidation stability reduces ageing and sludge formation, increasing equipment lifespan.

High Dielectric Performance

Ensures reliable insulation even under high electrical stress and voltage fluctuations.

Better Cooling Efficiency

Excellent thermal conductivity improves transformer operating efficiency and reduces overheating.

Reduced Maintenance

Low gassing tendency and ultra-low sulphur content minimize maintenance requirements and oil degradation.

Enhanced Safety

Fire-resistant ester oils provide higher fire points and safer operation in critical environments.

Environment Friendly

Natural ester grades are biodegradable and suitable for eco-sensitive areas.

International Quality Compliance

Manufactured according to IEC, ASTM, BIS, and global transformer oil standards.

Reliable Performance in Extreme Conditions

Suitable for high-load, high-voltage, and harsh climatic operating conditions.