Home > Product Catalog > Industrial Fluids > Electrical Insulating Oil > Mineral Transformer Insulating Oil
Mineral transformer insulating oil U-30 T-30 I-30 for electrical equipment
Electrical Insulating Oil · B2B Supply

Mineral Transformer Insulating Oil

Manufacturer and supplier of transformer oils U-30, T-30, and I-30

U-30 T-30 I-30 Electrical Insulation Up to 330 kV Pour Point -30°C

Ningbo MOS Chemical Co., Ltd. manufactures and supplies mineral transformer insulating oil for power transformers and related electrical equipment. We support international B2B wholesale cooperation, large-volume procurement, partnerships with importers and distributors, and OEM or private label packaging.

Electrical Insulation High breakdown voltage and low dielectric losses
Cooling and Heat Transfer Low viscosity promotes heat dissipation from equipment
Oxidation Stability Helps limit acid and deposit formation
Low-Temperature Fluidity Ensures performance under low-temperature conditions
Send Inquiry

Mineral Transformer Insulating Oil

Mineral transformer oil is an electrical insulating and cooling fluid designed for power transformers and other electrical equipment with similar operational requirements. Its electrical insulating properties, breakdown voltage, and low dielectric dissipation factor help reduce the risk of discharges and power losses in high-voltage electric fields.

The oil also provides cooling and heat transfer within electrical equipment. Its thermal and oxidation stability help limit the formation of acids and deposits during operation, while its low-temperature fluidity supports performance in harsh environmental conditions.

This product is available in the U-30, T-30, and I-30 series and is suitable for internal cooling and insulation in transformers with voltages up to and including 330 kV, as well as in other electrical equipment with similar requirements.

Ningbo MOS Chemical Co., Ltd. manages production, international supply, and export services for transformer insulating oils. MOSINTER GROUP operates as an investment group with stakes in multiple production facilities, ensuring stable production coordination, B2B wholesale sales, bulk procurement, distributor cooperation, and OEM or private label packaging.

Typical Applications

  • Power Transformers up to 330 kV Inclusive
  • Instrument transformers and associated electrical equipment
  • Electrical insulation within transformer systems
  • Cooling and heat dissipation of the transformer
  • Electrical equipment operation at low temperatures
  • Bulk supply B2B, large-volume bulk supply and OEM procurement
Production and filling of industrial mineral transformer insulating oil

Product Parameters

PositionGradeU-30T-30I-30Test Method
Density at 20°C, kg/m³, max.895895895GB/T 1884
Kinematic Viscosity at -30°C, mm²/s, max.180018001800GB/T 265
Pour point, °C-30-30-30GB/T 3535
Flash point (closed cup), °C, min.135135135GB/T 261
Total acid number, mg KOH/g0.010.010.01GB/T 264
Breakdown Voltage (after treatment), kV, min.707070GB/T 507
Dielectric loss tangent at 90 °C, max.0.0050.0050.005GB/T 5654
Interfacial tension, mN/m, min.404040GB/T 6541
Antioxidant content, mass fraction %No0.080.08~0.4SH/T 0802

Frequently Asked Questions About Mineral Transformer Oil

What is mineral transformer oil used for?

Mineral transformer oil is used for electrical insulation, cooling, and heat dissipation in power transformers and other electrical equipment with similar operational requirements.

What Transformer Oil Series Are Available?

Product series presented on this page include U-30, T-30, and I-30. Grade selection should be based on transformer design, equipment requirements, operating conditions, and customer specification.

What equipment voltage is this transformer oil suitable for?

This mineral transformer insulating oil is suitable for internal cooling and insulation in transformers rated up to and including 330 kV, as well as other electrical equipment with similar requirements.

What Packaging Options Are Available for Mineral Transformer Oil?

Standard packaging shown on this page is a 170 kg steel drum. Other packaging requirements can be discussed for qualified bulk and OEM orders.

Do you offer bulk supply and OEM delivery of transformer oil?

Yes. Ningbo MOS Chemical Co., Ltd. supports international B2B wholesale sales, bulk procurement, importer and distributor partnerships, and OEM or private label packaging of transformer oil.