1. The significance and purpose of
If impurity gases such as oxygen, nitrogen,
carbon dioxide, and water vapor exist inside the transformer, the insulation
strength of the transformer will be reduced and the transformer oil may be
polluted. Therefore, during the manufacturing process of the transformer, the
internal gas must be extracted so that the inside of the transformer is in a
negative pressure state, thereby effectively ensuring the insulation
performance and service life of the transformer.
Transformer Vacuum Units
2. Transformer vacuuming method and process
There are generally two ways to evacuate
transformers: on-site vacuum and workshop vacuum. On-site vacuum mainly uses
the busbar single opening method, which opens the busbar of the transformer,
and then uses a vacuum pump to extract the gas inside the transformer. Workshop
vacuum is to remove the transformer from the production line and put it into
the workshop for vacuum extraction. Workshop vacuum extraction can also be
divided into two methods: dry and wet. Wet vacuuming requires the use of a
liquid cooler, while dry vacuuming does not.
The transformer vacuuming process is as
(1) Control the vacuuming time: The vacuuming time should be controlled at about 150~180 minutes to ensure that the gas
inside the transformer is fully extracted. (Please tell PureTech team that your oil tank capacity of transformer, our professional team will recommend you the suitable model)
(2) Control the vacuum degree: Generally
speaking, transformer vacuuming requires a vacuum degree of less than
(3) Control the pumping rate: The pumping
rate refers to the amount of gas pumped from the container in unit time. In
order to prevent the materials inside the transformer from overheating, the air
extraction rate should not be too fast and is generally controlled below 10L/s (also depends on the capacity of transformer oil tank).
3. Precautions for vacuuming the
(1) A vacuum pump is required to evacuate
the transformer. Therefore, it is necessary to ensure that the quality and
performance of the vacuum pump meet the requirements to avoid contamination of
the transformer oil.
(2) During the vacuum extraction process of
the transformer, attention should be paid to temperature control to avoid damage
to the transformer material due to excessive temperature.
(3) Extracting vacuum from a transformer
requires certain experience and skills. In addition to mastering parameters
such as exhaust time and exhaust rate according to the actual situation, it is
also necessary to formulate corresponding vacuum extraction plans based on
different transformer materials and operating environments.
In short, transformer vacuuming is a key
step to ensure the insulation performance and service life of the transformer.
During the transformer manufacturing process, vacuum extraction is generally
completed by the manufacturer. Before the transformer is put into use, it must
be vacuumed again to ensure the normal operation of the transformer.
PureTech offers various equipments and solutions for industrial oil treatment, power plant maintenance, mechanical design. If you have demands for transformer oil treatment plant, vacuum unit for transformer drying, air dryer for transformer maintenance work, steam turbine oil treatment, etc. Welcome to contact PureTech Oil Filtration !
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