Kategoria: jak działa transformator

We have already written about what the no-load condition of a transformer is, and we have taken a close look at its load condition. Now we shall deal with another property – we take a closer look at the short-circuit...

The basic information on how a transformer works was explained in the previous article. It is worth developing a few further concepts and relationships, however, in order to understand the functionality, operating principles and construction of this type of device...

Three-phase transformers operate in the same way as single-phase transformers. The principle of operation is analogous. Here, however, we have a minimum of three supply conductors carrying alternating voltages phase-shifted by 120°. The windings of such a transformer are wound...

A transformer is used to convert an alternating voltage of a given value into an alternating voltage of a different value, while maintaining the same frequency. A special case is that of transformers which do not change the voltage values,...

Safety isolating transformers provide, in accordance with standard PN-EN61558-2-6, protective separation of the primary and secondary windings. They are intended to supply circuits with a safety extra-low voltage. Furthermore, the secondary voltage under no-load conditions must not exceed 50V AC...

We often come across situations in which it becomes necessary to use a transformer with several secondary windings or windings with tappings. Transformers of this type, classified as so-called combined transformers, are usually made for the manufacture of various pieces...

When we need to increase the supply capacity for a given load, it is necessary to connect two or more transformers in parallel. Correct operation of such a set is possible only if several requirements are met. The basic requirement...

Because a transformer generates losses, it is worth introducing the concept of efficiency, which is defined as the ratio of the power delivered to the load to the sum of the power delivered to the load and the copper and...

We already know what the no-load condition of a transformer is. Now we present the transformer load condition in greater detail. Assuming that the transformer load is within the permissible limits, it can be stated that the magnetising current I0...

The no-load condition of a transformer is a condition in which the transformer is supplied with primary voltage. The terminals of the secondary winding remain open. In this condition the secondary-side current is equal to zero, while the primary-side current...

What is intermittent duty of a transformer? The rating required for a transformer operating in an “intermittent” manner in identical, defined cycles is determined from the following formula: S = √ (tp/(4tc) x Sodb where: S – transformer rating tp...

The power losses occurring in transformers are responsible for the generation of heat. The heat originates mainly from the windings and the core. The heat released is an undesirable phenomenon and gives rise to a number of design constraints and...

A great deal of uncertainty arises with regard to the protection of transformers. What do the symbols IP21 or IP56 mean? Which transformer should be selected when it is to operate indoors, outdoors, in a mine or under water? So...