Phillips 66 Transformer Oil

Phillips 66 Transformer Oil

Type II Inhibited Electrical Insulating Oil for Transformers and Oil-Immersed Electrical Equipment

Phillips 66 Transformer Oil is a highly refined electrical insulating oil formulated for oil-immersed transformers and other electrical equipment requiring a Type II inhibited oil meeting ANSI/ASTM D3487-09 requirements.

The formulation uses hydrotreated naphthenic base oils with an oxidation inhibitor to help control sludge and deposit formation. Compared with non-inhibited Type I transformer oils, the inhibited formulation is designed to provide greater resistance to oxidation and support extended oil service life.

Phillips 66 Transformer Oil also provides high dielectric strength, low power factor and strong low-temperature fluidity. It is noncorrosive to copper and copper alloys and contains no PCBs.

Key Features

• Type II inhibited electrical insulating oil
• Meets ANSI/ASTM D3487-09 Type II requirements
• Hydrotreated naphthenic base oil formulation
• Contains an oxidation inhibitor
• High dielectric strength
• Low power factor
• Helps resist oxidation, sludge and deposit formation
• Excellent low-temperature properties
• Noncorrosive to copper and copper alloys
• Compatible with materials commonly used in transformers
• PCB-free
• ISO Grade 10

Transformer and Electrical Equipment Applications

Phillips 66 Transformer Oil is developed for use in oil-immersed electrical equipment where the manufacturer specifies an appropriate Type II inhibited insulating oil.

• Oil-immersed transformers
• Capacitors
• Circuit breakers
• Electrical switches
• Fuses
• Tap changers
• Other compatible oil-immersed electrical equipment

Always confirm the required insulating-fluid specification with the transformer or equipment manufacturer before filling, topping off or changing fluid.

Electrical Insulation and Dielectric Strength

Transformer oil performs two critical functions in oil-filled electrical equipment: electrical insulation and heat transfer.

Phillips 66 Transformer Oil provides high dielectric strength to help electrically isolate energized components within compatible equipment.

The current Phillips 66 Product Data Sheet lists a typical dielectric breakdown voltage of 40 kV using ASTM D877 at the point of manufacture.

Dielectric strength is highly sensitive to contamination. Even a small amount of water can significantly reduce the insulating capability of transformer oil.

Why Transformer Oil Must Be Kept Clean and Dry

Moisture, dust and other contaminants can reduce the dielectric performance of an electrical insulating oil.

Phillips 66 specifically recommends protecting Transformer Oil from moisture and contamination during storage and handling.

• Store drums indoors when possible
• Keep drums covered and protected from dust and debris
• If outdoor storage is unavoidable, protect drums from the elements and position them to minimize water accumulation around closures
• Avoid unnecessary exposure after the original seal is broken
• Use the entire drum when practical after opening
• If contamination is suspected, inspect and test the oil for dielectric strength before use

Proper storage and handling are particularly important with transformer oil because cleanliness directly affects electrical insulating performance.

Type II Inhibited Transformer Oil

Type II transformer oil contains an oxidation inhibitor.

Oxidation occurs as insulating oil is exposed to heat, oxygen and other operating stresses over time. Oxidized oil can contribute to acid formation, sludge and deposits.

The oxidation inhibitor in Phillips 66 Transformer Oil helps slow this degradation process and control sludge and deposit formation.

Phillips 66 identifies this as providing extended service life compared with non-inhibited Type I transformer oils.

Low-Temperature Performance

Transformer oil must remain sufficiently fluid during cold operating conditions to circulate and transfer heat.

Phillips 66 Transformer Oil has a typical pour point of -60°C (-76°F), supporting fluidity at very low temperatures.

Its naphthenic base-oil formulation contributes to these low-temperature characteristics.

Copper Compatibility

Phillips 66 Transformer Oil is noncorrosive to copper and copper alloys.

The current Product Data Sheet reports Non-corrosive performance under ASTM D1275B for corrosive sulfur.

This is important because copper conductors and other copper-containing components are commonly present inside oil-filled electrical equipment.

PCB Content

Phillips 66 Transformer Oil does not contain PCBs.

The current Product Data Sheet reports PCB content as None under ASTM D4059.

Industry and OEM Specifications

Phillips 66 states that Transformer Oil meets the requirements of:

• ANSI/ASTM D3487-09 Type II Inhibited Oil
• British Standard BS 148, Class 1A
• Federal VV-I-530A, Class II Specification
• GE A13A3A2 (10CA)
• IEEE
• IEC 60296
• NEMA Type II, obsolete
• Westinghouse Specification PDS 55822AG

Equipment requirements should always be confirmed against the current manufacturer documentation before use.

Typical Technical Properties

Typical properties are average values and should not be treated as guaranteed specifications. Dielectric breakdown voltage is measured at the point of manufacture.

Frequently Asked Questions

What is Phillips 66 Transformer Oil?
Phillips 66 Transformer Oil is a highly refined Type II inhibited electrical insulating oil designed for oil-immersed transformers and other compatible electrical equipment.

What is transformer oil used for?
Transformer oil provides electrical insulation and helps transfer heat in oil-filled electrical equipment. Phillips 66 identifies applications including transformers, capacitors, circuit breakers, switches, fuses and tap changers.

Is Phillips 66 Transformer Oil a Type II inhibited oil?
Yes. It is formulated as a Type II inhibited transformer oil and meets ANSI/ASTM D3487-09 Type II requirements.

What does inhibited transformer oil mean?
An inhibited transformer oil contains an oxidation inhibitor designed to slow oil degradation and help control sludge and deposit formation during service.

What is the difference between Type I and Type II transformer oil?
The key distinction is oxidation inhibitor content. Phillips 66 describes its Type II inhibited formulation as providing greater oxidation resistance and extended service life compared with non-inhibited Type I transformer oils.

Does Phillips 66 Transformer Oil meet ASTM D3487?
Yes. Phillips 66 states that the product meets ANSI/ASTM D3487-09 Type II requirements.

Does Phillips 66 Transformer Oil meet IEC 60296?
Yes. IEC 60296 is included among the industry requirements listed on the current Phillips 66 Product Data Sheet.

What is the dielectric strength of Phillips 66 Transformer Oil?
The current Product Data Sheet lists a typical ASTM D877 dielectric breakdown voltage of 40 kV at the point of manufacture.

Why does transformer oil need to stay dry?
Water significantly decreases dielectric strength. Because transformer oil functions as an electrical insulator, even relatively small amounts of moisture can reduce its ability to withstand electrical voltage.

Can an opened drum of transformer oil be stored?
It can be stored, but contamination control is critical. Phillips 66 recommends using the entire drum once the seal is broken when practical. If contamination is suspected, the oil should be inspected and tested for dielectric strength before use.

What is the pour point of Phillips 66 Transformer Oil?
The typical pour point is -60°C (-76°F).

Is Phillips 66 Transformer Oil PCB-free?
Yes. The current Product Data Sheet lists PCB content as None under ASTM D4059.

Is Phillips 66 Transformer Oil corrosive to copper?
No. Phillips 66 identifies the oil as noncorrosive to copper and copper alloys, and the current PDS lists ASTM D1275B corrosive sulfur performance as non-corrosive.

Can Phillips 66 Transformer Oil be used in circuit breakers?
Yes, where the circuit breaker manufacturer specifies a compatible oil-immersed Type II insulating fluid.

Can Phillips 66 Transformer Oil be used in tap changers?
Yes. Tap changers are specifically listed among the intended applications.

Can Phillips 66 Transformer Oil be used in capacitors?
Phillips 66 identifies capacitors among the equipment for which the oil was developed. Confirm the capacitor manufacturer's required insulating-fluid specification before use.

Can I mix transformer oils?
Do not assume different transformer oils are interchangeable or compatible. Confirm the equipment requirement and fluid compatibility before mixing products, particularly when different inhibitor systems or specifications may be involved.

Should transformer oil be tested before use?
If contamination is suspected, Phillips 66 specifically recommends inspecting the oil and testing its dielectric strength before use.

Is Phillips 66 Transformer Oil ISO Grade 10?
Yes. The current Product Data Sheet lists the product as ISO Grade 10, with a typical kinematic viscosity of 9.6 cSt at 40°C.