Type of Oil in Transformer

Transformer oil plays a vital role in the reliability, safety, and longevity of electrical transformers. Used primarily for insulation and cooling, the type of oil used directly impacts performance, especially under high voltage or fluctuating thermal conditions. In this article, we explore the different types of transformer oils and highlight premium-grade options offered by Davor Sdn Bhd.

Main Types of Transformer Oil

There are two major categories of transformer oil:

1. Mineral-Based Transformer Oil

This is the most widely used transformer oil type and is derived from crude petroleum. It can be further divided into:

• Naphthenic Oil – Has excellent low-temperature performance and oxidation stability. Most modern high-grade transformer oils fall into this category.

• Paraffinic Oil – Offers better oxidation resistance but poorer low-temperature properties.

2. Synthetic and Natural Ester Oils

These biodegradable alternatives are often used in environmentally sensitive applications. They offer higher fire points and improved sustainability but may come at a higher cost.

Key Functions of Transformer Oil

• Electrical Insulation: Prevents arcing and corona discharge.

• Cooling: Transfers heat away from transformer windings.

• Moisture Protection: Absorbs moisture and maintains dielectric strength.

• Oxidation Resistance: Ensures long service life under thermal stress.

Premium Transformer Oil Solutions from Davor

At Davor Sdn Bhd, we are committed to supplying top-quality transformer oils that meet the latest IEC and ASTM standards. We offer the following Nynas transformer oils:

Nynas Nytro Libra

A high-performance uninhibited naphthenic mineral oil with excellent oxidation stability, designed for long-term use in power and distribution transformers.

• Uninhibited formulation

• IEC 60296 compliant

• Excellent low-temperature fluidity

• Ideal for demanding grid and industrial environments

Nynas Nytro Gemini X

An inhibited transformer oil formulated for high oxidation stability and extended service life, particularly in sealed and high-load systems.

• Inhibited (contains oxidation inhibitors)

• IEC 60296 and ASTM D3487 compliant

• Extended service intervals

• Suitable for high-temperature and compact transformers

Choosing the Right Transformer Oil

The right choice depends on:

• Transformer design (sealed vs. free-breathing)

• Operating environment (temperature range, humidity)

• Regulatory standards and maintenance practices

For critical infrastructure and long-life equipment, inhibited oils like Nytro Gemini X are often preferred. For legacy or conventional systems, Nytro Libra provides a reliable and cost-effective option.

Need Expert Advice?

Davor Sdn Bhd offers technical support and supply solutions for transformer maintenance and oil replacement. Contact us for consultation, bulk supply, or testing services tailored to your operational needs.

Contact us at https://davor.com.my/contact