What are the special uses of step-down transformers?

  Step-down transformers are generally used in regular use, but it cannot be ruled out that step-down transformers have special applications under special conditions. It is better to say that under the harsh natural conditions of heavy rain weather, frequent floods, high temperature and cold, step-down transformer is also strictly used, and it can also be used, and step-down transformer should have special use in special occasions. For example, in hospitals, schools, stations and other densely populated places, step-down transformers should be used to avoid danger. The special applications of the commonly used step-down transformer are as follows, and the following can be used for reference only:

Due to weight reduction requirements (especially for high-speed trains), the main step-down transformer is often designed as a step-down transformer with more copper and less iron. The total mass of a step-down transformer depends on the quality of its effective parts (winding copper wire, silicon steel sheet, insulation), the step-down transformer tank and the insulating fluid, for which high-quality materials are often selected

。 Cooling medium, mineral oil was mostly used in the past, and silicone oil and synthetic grease are now used for fire prevention and quality reduction.

b. The external dimensions of the main step-down transformer are related to its installation position, some are installed in the car, and some are suspended under the body underframe. For electric units, they are generally installed under the body underframe, and often adopt a flat structure, so as not to occupy the area of the passenger room. Also required:

The main step-down transformer achieves the specified power at a given volume, form factor, and specified mass.

The ability of the main step-down transformer to withstand vibration, acceleration, and mechanical strength during short circuits.

The main step-down transformer is a multi-winding step-down transformer, which requires complete decoupling of each winding as much as possible. In order to limit the effect of the higher harmonics of the step-down transformer on the grid, a high short-circuit impedance is generally required, and the short-circuit impedance between the high-voltage winding and the traction winding is required to be as identical as possible.

e. Improve efficiency (low loss).

The leakage outside the main step-down transformer should be as minimal as possible to avoid interference with the electronics.