What are the differences between dry-type test transformers, oil type test transformers, and gas filled test transformers?

Dry type test transformers, oil type test transformers, and gas filled test transformers have differences in insulation medium, structure, performance characteristics, cost and maintenance, and application scenarios. The following is a specific analysis:

1. Different insulation media:

① The dry-type test transformer adopts resin insulation, integrated molding, and does not require inflation or insulation oil.

② The oil type test transformer uses insulating oil for insulation and arc extinguishing inside.

③ The inflatable test transformer uses SF6 gas for insulation and arc extinguishing inside.

2. Different structures:

① The dry-type test transformer is manufactured using internal iron core and epoxy resin casting technology, allowing users to directly see the iron core and coil.

② The oil type test transformer places the body consisting of the iron core and winding in an oil tank filled with transformer oil, with only the outer shell visible.

③ The inflatable test transformer is wound on the iron core and connected by copper wire, making the overall structure relatively lightweight.

3. Different performance characteristics:

① Dry type test transformers have the advantages of strong fire resistance, environmental friendliness, and high mechanical strength, but they are large in size, heavy in weight, and almost irreparable once internally damaged.

② Oil type test transformers have the advantages of low cost, fast voltage rise, strong withstand voltage, and easy maintenance, but the equipment is bulky, not conducive to outdoor use, and may have oil pollution problems.

③ Inflatable test transformers have the advantages of small size, light weight, and cleanliness without oil stains, but the equipment cost is high, and if the internal gas escapes, it is very difficult to maintain.

4. Different costs and maintenance:

① Dry type test transformers are relatively expensive, but they are easy to maintain and do not require special maintenance.

② The procurement and maintenance costs of oil type test transformers are relatively low, but they require regular replacement of insulation oil and maintenance.

③ The cost of inflatable test transformer equipment is relatively high, and later maintenance requires filling insulation gas inside, which is more expensive than oil type test transformers.

5. Different application scenarios:

① Dry type test transformers are suitable for places that require fire and explosion prevention, such as large buildings, high-rise buildings, etc.

② Oil type test transformers are suitable for outdoor or on-site excavation of “accident oil pools” and are commonly used for insulation and grounding fault detection in power systems.

③ Inflatable test transformers are suitable for places with requirements for volume and weight, such as high-voltage system testing in power systems, such as transmission lines, substations, etc.

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