trihal dry transformer

Dry transformer, especially models with SF6 gas (trihalogen), are no longer just an alternative to oil transformers. This is a solution that requires a specific approach to design, installation and operation. Often, in discussions, you hear about ease of maintenance - this is true, but in reality everything is much more complicated. In this article I tried to systematize my experience working with these devices, share observations and, perhaps, warn a little about common mistakes.

Introduction: Why choose SF6 gas?

SF6 gas (trihalogens) as a dielectric in dry-type transformers appeared relatively recently, but quickly established itself as an effective replacement for traditional dielectric oils. The main advantage is environmental friendliness and fire safety. This is especially true in modern conditions, when security requirements are becoming more stringent. In addition, dry transformers with SF6 gas are more compact in size and lighter in weight, which simplifies installation and reduces construction costs.

I remember back in the early 2000s when we first encountered prepositions usingdry transformerwith SF6 gas, great doubts arose. The price was significantly higher than that of oil analogues, and there were not so many qualified service specialists. But long-term analysis showed that the investment was justified. Safety, durability and ultimately lower operating costs outweighed the initial investment.

Technical aspects: what is important to know?

Workdry transformerwith SF6 gas it is not just about changing the oil. It is necessary to take into account design features, insulation materials and cooling systems. SF6 gas has higher dielectric properties than dielectric oil, which makes it possible to create more compact transformers. However, if the insulation is damaged, SF6 gas can form decomposition products, which must be taken into account when designing the protection and ventilation system.

One of the common questions is the choice of cooling system. Air or oil cooling systems are usually used. When using air cooling, it is important to ensure sufficient air circulation around the transformer. When using an oil cooling system, it is necessary to use a special dielectric oil compatible with SF6 gas. Incorrect oil selection can result in reduced cooling efficiency and degraded transformer performance.

Practical problems: where it can 'diverge'

During operationdry transformerWith SF6 we encountered several problems that could have been prevented. For example, failure to properly clean a transformer from dust and contaminants can lead to overheating and premature failure. It is also important to regularly check the condition of the insulation and protection system.

The problem with moisture condensation inside the transformer is especially acute. This may cause arcing and damage to the insulation. To prevent condensation, it is recommended to use dehumidifiers or install ventilation systems that provide a constant flow of dry air. We once lost a transformer due to a malfunctioning dryer - that was a painful lesson.

Features of installation and commissioning

Installationdry transformerwith SF6 gas requires special care and adherence to technology. It is important to properly level the transformer and securely fasten it to the foundation. It is also necessary to ensure reliable grounding and cable connections. Installation features are also related to the ventilation system; it must be designed taking into account the specifics of SF6 gas.

Commissioning includes checking the insulation, cooling system and protection system. It is important to carry out a series of tests to ensure that all elements of the transformer are in good working order. One of the important stages is checking the tightness of the transformer chamber. Any leakage of SF6 gas can lead to reduced efficiency of the transformer and deterioration of its performance. We used special gas analyzers to monitor the tightness; this, in my opinion, is a very important stage.

Maintenance and repair: what to consider?

Servicedry transformerwith SF6 differs from servicing oil transformers. No oil changes are required, but the condition of the insulation, cooling system and protection system must be checked regularly. It is also important to visually inspect the transformer for damage and contamination.

Repairdry transformerwith SF6 gas is a complex task that requires special knowledge and experience. Typically, repairs are carried out in specialized laboratories equipped to work with SF6 gas. It is important to follow all safety rules when carrying out repair work to avoid SF6 gas poisoning.

Conclusion

Dry transformerwith SF6 gas is a promising solution for the modern energy industry. It has a number of advantages over oil transformers, such as environmental friendliness, fire safety and compactness. However, to ensure reliable and durable operation, all design, installation, operation and maintenance requirements must be met. Do not underestimate the complexity of this equipment - you need qualified personnel and a competent approach to solving emerging problems. Wenzhou Qiaonasen Electrical Equipment Co., Ltd. specializes in high and low voltage transmission and distribution solutions, providing a full range of services from design to maintenance of such systems. More detailed information can be found on our website: https://www.qnasen.ru.