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Power Knowledge | What are the Advantages of Oil-immersed Test Transformers
2025-06-24
An oil-immersed test transformer serves as the voltage-boosting component in power frequency withstand voltage test devices. Besides oil-immersed types, dry-type or gas-filled test transformers can also be used for voltage boosting. The main difference among these transformers lies in their insulating media, each with unique advantages and disadvantages. This article focuses on the advantages of oil-immersed test transformers.
The primary advantages of oil-immersed test transformers include being cost-effective, durable, and widely applicable to both low and high voltage level power frequency withstand voltage tests. These features make them highly popular among power engineers.
Why are they cost-effective and durable? The insulating medium inside is economical insulating oil, which offers advantages over gas or casting-type insulators: lower cost, convenient storage, simpler manufacturing processes, and minimal maintenance expenses. These factors contribute to their cost-effectiveness.
Another key advantage is their preference in high voltage level tests. The stability of insulating oil gives them a significant edge in boosting voltage to high levels.
While oil-immersed test transformers have notable advantages, they also have drawbacks, such as large size and heavy weight in high voltage applications, and potential environmental pollution from insulating oil. However, their advantages outweigh the disadvantages, making them the go-to choice for many engineers seeking cost-effective and durable solutions. When selecting one, consider whether its advantages meet your specific needs.
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