1, iron core
With folding open core, each core frame is assembled by several precise folding forming tapes from inside to outside. Single-phase and three-phase core assembled by single-frame iron can be solidified and bonded to make the core a solid whole.
2. Strong Short Circuit Resistance
The unique structure of folding open core and the coil assembly technology are used to fully exert and effectively take the protection measures against sudden short-circuit, which has the characteristics of strong short-circuit resistance.
3. Maintainability
The folding open core dry-type transformer is easy to replace coils, which makes the transformer maintainable and conforms to the development trend of transformer.
4. Production efficiency: In the process of transformer production, cores and coils can be manufactured separately. The coil can be wound by ordinary winding machine, and the coil can be poured independently, which not only guarantees the manufacturing quality of the coil, but also improves the production efficiency of the coil, and is suitable for batch production.
5. Save Material
(1) Core window height can reduce the window height because it does not need the space restriction of winding die, so it can reduce the weight of core and coil, thus reducing iron loss and coil copper loss, and effectively saving material costs.
(2) The coil of open core transformer is wound separately, and the distance between outer diameter of core coil and core can be reduced accordingly, thus reducing the amount of core and coil, reducing iron loss and copper loss of coil, and saving material cost.
6. Partial discharge
The high voltage adopts thin insulating pouring structure. The poured resin mixture can be completely immersed into each gap of the coil to eliminate the existence of the gap and effectively suppress the occurrence of partial discharge. The partial discharge is less than 10 pC, and most products do not exceed 5 pC.
7. Good mechanical strength
The upper and lower clamps are integral, which protects the whole core from external forces during manufacture and transportation, and can effectively compact and support the coil, thus improving the ability of resisting the axial electric force of transformer in sudden short circuit.
8. (1) Energy saving
Compared with traditional transformer, folding core resin insulated dry-type transformer has the characteristics of less material, less reluctance and less no-load current. Especially for three-dimensional core, no-load current is reduced by 60%-80% compared with national standard, which improves power factor and reduces power loss. The yoke cross section of the core is half of the cross section of the core column, so that the three-dimensional core can naturally reduce the no-load loss. Make sure no-load loss is minimal.
(2) Environmental protection
Resin-insulated dry-type transformer adopts three-dimensional open core, which has the characteristics of low noise, low leakage magnetic field and zero third harmonic, so as to reduce pollution to environment and power grid.
9. Low cost
(1) Material cost
Compared with the traditional resin insulated dry-type transformer, the average weight of copper and silicon steel decreases by 15% and 25% respectively.
(2) Reducing the Cost of Tools and Dies
Closed resin insulated dry-type transformer coils need to be wound in the core. Coil casting is limited by size conditions. Gears and dies are complex and difficult to be used universally, and the process of removing gears and assembling and demoulding is cumbersome. The open core does not need die, which reduces the cost.
(3) Labor costs
The core is manufactured automatically by folding open core NC forming machine, which realizes the replacement of manual labor by machinery. Reduce labor costs and improve production efficiency.
