Core

The core of manufacturing high quality oriented cold-rolled silicon steel sheet material, 45 degree oblique joint structure, column with insulating banding, core surface of the insulating resin sealing moisture-proof rust proof paint, clamps and fasteners by surface treatment to prevent rust.

Low pressure foil coil

For low voltage and high current coil, short circuit short circuit when the stress is larger, while the low pressure turns less, more by low voltage current winding type ampere turns unstable problem more prominent, the heat problem also focused on the need to consider, at low pressure with foil winding can solve the above problems, the first foil products do not exist the number of turns of the axial and axial winding spiral angle, high and low voltage winding short circuit of transformer ampere turn balance, the axial stress is smaller, secondly because the insulation is thin, and easy to set up multi process air duct, thermal issues are resolved.

High pressure pouring coil

The coil adopts F insulated copper wire as conductor, and the glass fiber and epoxy resin composite material are insulated. The expansion coefficient is similar to that of copper conductor, and has good shock resistance, temperature resistance and anti cracking performance. All components of glass fiber and epoxy resin are self extinguishing, will not continue to burn, and will not produce toxic gases and pollute the environment. Epoxy resin has good insulation characteristics, especially suitable for making high voltage coil.

Temperature control

The transformer is equipped with temperature overheating protection device, the overheating protection device mainly through the embedded in the low voltage coil of the Pt thermistor, transformer temperature detection and control. The device provides the following functions:

1. The temperature of the three-phase winding is displayed on the circuit during the operation of the transformer;

2. Display the temperature of the hottest one phase winding;

3. sound light warning and fan start;

4. fan overload protection and computer interface.

Cooling method

Cooling mode of dry-type transformer is divided into the natural air cooling (AN) and air force (AF), natural air cooling (AN), continuous output rated capacity, by forced air cooling (AF), the transformer output can exceed the rated load of the 40% brands, applicable to all kinds of emergency load or short-term load operation. Forced air cooling (AF) is not recommended for long time continuous overload operation due to larger load loss and higher impedance voltage.

When the transformer is running, it needs proper ventilation. When the transformer is installed in the basement or poor ventilation environment, it is necessary to add a cooling ventilation device. The ventilation volume is selected according to the air volume per 1kW loss 2-4m/min.

The protection of housing and outgoing line bus

Dry type transformer generally no shell protection, that is, IP00, according to user requirements, you can install IP20, IP23 and other protective requirements of the shell.

The IP20 housing prevents solid foreign matter with a diameter greater than 12 mm into the housing, providing safety protection for live parts.

IP23 also has the ability to prevent water droplets from flowing into a 60 degree angle with a straight line, which is suitable for outdoor operation.

The IP23 shell reduces the transformer cooling capacity by a small capacity drop of about 5%, and a large capacity drop of about 10%.

The shell material is made of steel plate, aluminium alloy and stainless steel. When the shell is made of steel plate, the color of the shell can be chosen by the user.

The standard outlet line of the low voltage outlet line, the side outlet and the top line can be used, and the special outlet way can also be designed according to the user's requirements.