what are the characteristics of potted transformers?

 What are the characteristics of potted transformers?

1. Good gas performance and low partial discharge value: In the insulation structure of the transformer, there will be some local insulation weaknesses. It will discharge first under the action of the electric field, instead of immediately forming the entire insulation penetration breakdown, it may happen On the surface or inside of the insulator, that is, partial discharge. However, the damage or local aging of electrical insulation mostly starts from partial discharge, and its hazard is prominent in the rapid decrease in insulation life, which ultimately affects safe operation. Due to its unique structure (high and low voltage windings are all made of copper tape (foil)) and its advanced manufacturing technology (high and low voltage windings are all poured with epoxy resin and cured in a vacuum), it is partially The discharge value is low.

　　2. Strong lightning impact resistance: Because the high and low voltage windings are all made of copper tape (foil), the interlayer voltage is low, the capacitance is large, and the initial voltage distribution of the foil winding is close to linear, so it has strong lightning resistance.

　　3. Strong short-circuit resistance: Because the high and low voltage windings have the same reactance height, there is no helix angle phenomenon, the ampere-turns between the coils are balanced, and the axial force caused by the short circuit of the high and low voltage windings is almost zero, so its short-circuit resistance ability is strong.

    4. Good anti-cracking performance: The dry-type transformer adopts epoxy resin "thin insulation (1-3mm) technology", which can meet the occasions of low temperature, high temperature and wide temperature range, and meet the anti-cracking requirements after long-term operation. The problem of cracking that is difficult to solve by "thick insulation (6mm) technology" has been solved, so that dry-type transformers are technically guaranteed.

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