What is a encapsulated transformer?
Encapsulated transformers are simple transformers in which one or more transformer components are completely enclosed. During the potting process, the transformer is protected from dust, moisture, and other contaminants that could damage it. In addition to being easy to use, encapsulated transformers offer good environmental isolation, a beautiful appearance, and a good ability to dissipate heat.
What are the characteristics of encapsulated transformers?
- Low partial discharge value, good electrical performance. The insulation structure of the transformer has some local insulation weaknesses. It will first discharge under the action of the electric field, instead of immediately forming the entire penetration breakdown of the insulation. That is, partial discharge may occur either on the surface or on the interior of the insulator.
- The ability to withstand lightning shocks is strong. Due to the copper tape windings, the interlayer voltage is low, the capacitance is large, and the initial voltage distribution is linear, so it is lightning-resistant.
- Resistance to short circuits is strong. Due to the same reactance height between the high and low voltage windings, there is no helix angle phenomenon, the ampere turns between the coils are balanced, and the axial force caused by the short circuit between the high and low voltage windings is almost zero, which results in high short circuit resistance.
What is the difference between encapsulated transformer and common transformer?
Encapsulated transformers are characterized by their small size and high power density. Encapsulated has a relatively high protection level without potting, which is IP00 without protection. The epoxy resin bonds well to metals and non-metals and has good dielectric properties; Curing epoxy resin provides good dimensional stability, high hardness, and flexibility. Once the transformer is filled with glue, it provides impact resistance, insulation, fixing, and noise reduction; Once the transformer has been tested and potted, it will have good stability and will not be susceptible to other changes in the future.
Epoxy resin encapsulated transformers function
Vacuum potting fix the lamination steel and bobbin, and at the same time, ensure that the transformer will not corrode when placed in the air for a long time. It is perfect for applications in harsh environments, where dust, lint, moisture and corrosive contaminants can accumulate. Transformers encapsulated in epoxy are designed to operate in extreme environments. In epoxy encapsulated transformers, silica sand resin forms a solid block that completely encloses and protects the core and coil, and also significantly reduces noise.
What is resin encapsulated transformer?
Voltage, current, and impedance are transformed by resin encapsulated transformers using electromagnetic mutual induction. This transformer is completely enclosed in epoxy and sand encapsulation material, which is baked to form a “brick” that seals into the enclosure, effectively removing moisture and contaminants from the core and windings. Transformers, solenoid valves, and restrictors encapsulated or potted offer superior protection against environmental influences and corrosion, along with electrical insulation, heat dissipation, and mechanical stability.
What is epoxy resin transformer?
Epoxy resin type transformers have a core and coil surrounded by a mixture of epoxy and sand that dries to a brick-like consistency. The most common epoxy resin transformers are dry-type epoxy resin transformers. As a replacement for oil-immersed distribution transformers, epoxy resin transformers provide better performance than all other types of dry transformers. They are especially suitable for urban power grids, high-rise buildings, theaters, hospitals, hotels, tunnels, and subways, underground power stations, laboratories, stations, wharves, airports, combined substations, and other important sites.
What is a potted transformer?
In general, potted transformers, also known as epoxy encapsulated transformers, are suitable for applications where the ambient conditions are not conducive to the use of general-purpose vented dry type transformers. Potting compound has been poured into the plastic box to form the surface on the right.
What is epoxy potting compound used for?
Epoxy potting compound strengthens the integrity of electronic devices and increases resistance to external shock and vibration. To help with the miniaturization and lightening of a device, it is important to increase the insulation between the internal components and lines. This can prevent components and lines from being directly exposed to the surface so that they cannot be damaged. Additionally, it can improve the performance of the device in terms of being waterproof and moisture-proof.
