Why Does New Transformer Oil Also Need To Be Filtered?

Writer： Kaiqian Oil Purifier Release time：2025-11-03 16:39 Clicks：

 During transformer installation, even when using brand-new transformer oil, filtration is essential. The core reason is that during production, storage, transportation, and filling, new oil may still become contaminated with impurities, moisture, gases, and other harmful substances. These contaminants severely compromise the oil's insulating properties and heat dissipation capabilities, ultimately damaging the transformer's safe and stable operation. The following details the specific hazards, sources of contamination, and the critical role of filtration:

Comparison of Transformer Oil Before and After Filtration

1. Potential Harmful Substances in New Transformer Oil and Their Hazards

  The core functions of transformer oil are insulation (isolating the windings from the core and tank) and heat dissipation (dissipating heat generated by winding losses). Impurities, moisture, and gases can directly impair these two functions. The specific hazards are as follows:

Single-Stage Vacuum Transformer Oil Purifier on Site

2. Sources of Contamination in New Transformer Oil

  Although new transformer oil meets standards (such as GB 2536 or IEC 60296), contamination inevitably occurs during subsequent processes. Specific sources include:

Production and Packaging Residues:

During refining and storage, trace metal particles (from equipment wear) or fibers (from filter cloths) may remain in the oil. The inner walls of packaging drums are not thoroughly cleaned, and dust may adhere.

Transportation and Storage Contamination:

If drums are damaged or poorly sealed during transport, air (containing moisture and dust) may ingress. And storage in humid environments, moisture can seep into the oil through gaps in the drum lid seal.

Contamination during filling operations:

If oil filling pipes and valves are not pre-cleaned and dried, residual dust and moisture inside can enter the transformer with the oil.

If the transformer tank is not thoroughly cleaned before installation (welding slag or rust), these contaminants can be washed into the oil during filling.

Double Sgate Vacuum Oil Purifier for 500KVA Transformer

3. The Critical Role of Filtration

Kaiqian Vacuum Transformer Oil Purifiers apply physical filtration (removing impurities) and vacuum dehydration/degassing (removing moisture and gases) to ensure oil injected into transformers meets the standard.

Removing Solid Impurities: High-precision filter paper (typically ≤5μm) filters out metal debris, dust, fibers, and other contaminants from the oil, preventing partial discharge and component wear.

Deep dehydration and degassing: Utilizing the "heating-vacuum" system of vacuum oil purifiers reduces moisture content to ≤10 ppm (trace water) and gas content to ≤0.3%, restoring the oil's high insulation strength and heat dissipation efficiency.

Kaiqian offers a variety of solutions for oils, For more details, please contact us:

Email:oilrecycling@kaiqiancq.com

WhatsApp: +8617723167431