What are the advantages and disadvantages of inflatable transformers and dry-type transformers

1. Advantages and disadvantages of inflatable transformers

① Advantages:

a. Small size and light weight: Inflatable transformers use SF ₆ gas as the insulation medium, making their volume and weight relatively small, easy to transport and install, especially suitable for places with limited space.

b. High strength insulation: SF ₆ gas has excellent insulation performance and can withstand high voltage and electric field strength, ensuring the safety and reliability of transformers.

c. Clean and oil-free: Inflatable transformers do not use insulating oil, so they will not produce oil stains and maintain a clean environment.

d. Long service life, no maintenance required: Due to its superior structural design and insulation medium, inflatable transformers usually have a long service life and do not require frequent maintenance during use.

② Disadvantages:

a. Complex process and high cost: The manufacturing process of inflatable transformers is relatively complex, and the price of SF ₆ gas is high, resulting in a high overall cost.

b. High requirements for the surrounding environment: Inflatable transformers have certain requirements for the surrounding environment (such as temperature, humidity, etc.) during use to ensure their normal operation.

c. SF ₆ gas leakage can cause pollution to the environment: SF ₆ gas is a potent greenhouse gas, and once a leak occurs, it will have a serious impact on the environment.

2. Advantages and disadvantages of dry-type transformers

① Advantages:

a. Strong fire resistance: Dry type transformers do not contain flammable resins and toxic gases, and have flame-retardant and self extinguishing characteristics, so their fire resistance is excellent.

b. Environmentally friendly and pollution-free: Dry type transformers do not require the use of insulating oil, so they will not cause pollution to the environment. At the same time, it does not require maintenance, further reducing its impact on the environment.

c. High mechanical strength: Dry type transformers have good mechanical strength and can withstand temperature changes and short-circuit impacts, ensuring their stable operation.

d. Flexible installation: Dry type transformers are small in size, light in weight, economical to install, do not require special foundations, and can be installed with load centers, greatly improving installation flexibility.

e. Temperature monitoring and protection: Dry type transformers are equipped with automatic temperature monitoring and protection systems, which can detect and control the operating temperature of the transformer in real time, ensuring the safe and stable operation of the transformer.

② Disadvantages:

a. High cost: Compared to oil immersed transformers, dry-type transformers have higher manufacturing costs, which to some extent limits their application in some low-cost projects.

b. Relatively poor ability to withstand harsh environments: Dry type transformers can generally only be installed indoors, and their ability to withstand harsh environments is relatively poor. For example, their adaptability to extreme environments such as high humidity and high temperature is limited.

c. High leakage resistance and winding temperature rise: Due to the use of stacked silicon steel sheets in the iron core of dry-type transformers, their magnetic permeability and reluctance are relatively low, resulting in a large no-load current and relatively high leakage resistance. Meanwhile, if the heat dissipation is poor during operation, it will cause the winding temperature to rise, affecting the insulation performance.

d. Maintenance difficulty: Although dry-type transformers do not require special maintenance during normal operation, once a fault occurs (such as coil breakage), its repair and replacement are difficult and costly.

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