Transformer Maintenance with Fluidex

Scheduled transformer maintenance of power transformers is recommended at least once every six months to ensure operational reliability, personnel safety, and long-term equipment performance. Transformer substations are used to receive, convert, and distribute voltage in alternating current power networks. These facilities transmit electricity to end users and are commonly installed in residential areas, rural settlements, and industrial sites. Timely inspection and servicing of transformer installations are extremely important. In the event of malfunctions, consumers may be left without electricity, while hazardous conditions may arise for personnel working at the transformer substation. Proper transformer maintenance helps prevent emergency situations, equipment failures, and safety risks. The Weakest Link: Transformer Insulation Cellulose insulation in windings is highly sensitive to moisture, which accelerates aging and reduces its dielectric strength. Over time, exposure to oxygen and oxidized oil products can weaken the insulation, leading to a higher risk of partial discharges, breakdowns, and costly failures. Effective transformer maintenance requires regular monitoring and intervention to maintain insulation integrity and moisture control.

Methods of Maintaining Transformer Insulation

Maintaining insulation performance and controlling moisture during operation can be achieved in two main ways:

Offline Transformer Drying: FLD V Transformer Evacuation System

One method involves drying the cellulose insulation of windings with the transformer disconnected from the grid—a process akin to a major overhaul. The FLD V Transformer Evacuation System is engineered to create a high vacuum for evacuating transformer tanks, making it suitable for assembly, maintenance, and operation of oil-filled equipment such as power transformers and high-voltage circuit breakers up to 1150 kV.

This system can handle both transformer evacuation and drying processes. It is ideal for companies engaged in transformer installation, repair, and maintenance, particularly in transformer oil treatment. While effective, this method is relatively costly and can be potentially risky, as improper operation may reduce transformer reliability, lifespan, or even lead to failure, causing significant financial losses.

Online Transformer Drying: FLD 0.15D System

An alternative, less disruptive method for transformer maintenance is drying insulation without disconnecting the transformer from the grid. The FLD 0.15D Online Transformer Dry-Out System is designed to continuously dry transformer insulation (both oil and paper) during operation.

The system circulates transformer oil through three sorbent cartridges, which absorb moisture before returning the dried oil to the transformer. The oil circulates at a rate of 0.15 gallons per minute through the three sorbent filters. The suction line connects to the transformer’s bottom fill valve, and the dried oil returns via a top tank valve. A single set of cartridges can remove up to 2.4 gallons of water. The system operates without the need for personnel, ensuring safe and continuous transformer maintenance.

Transformer Oil Purification: FLD 30D System

For large-scale transformer maintenance, oil quality is critical. The FLD 30D Transformer Oil Purification Machine removes dissolved gases, free water, dissolved water, and particulates from transformer oil. Equipped with a two-stage vacuum system, the FLD 30D can also perform vacuum evacuation of power transformers.

This system is also available in both stationary and mobile configurations, allowing oil purification directly on transformers, in storage tanks, or during production. 

Transformer Oil Regeneration: FLD 12R System

Over time, transformer oil oxidizes and changes color, losing its original properties. The FLD 12R Oil Regeneration System restores oxidized oil to its original quality. The process passes transformer oil through beds of Fuller's Earth, a purified clay that effectively removes polar contaminants and oxidation by-products. After regeneration, the oil’s parameters are restored to the level of new oil, ensuring reliable insulation and optimal transformer performance. Timely use of the FLD 12R system is an essential part of long-term transformer maintenance. Transformer maintenance with Fluidex systems ensures extended equipment lifespan, improved insulation reliability, and safe, efficient operation. Offline and online drying, oil purification, and regeneration systems such as FLD V, FLD 0.15D, FLD 30D, and FLD 12R enable operators to maintain transformers without risking failures or unplanned outages.