Components

A transformer consists of two important components, the winding and the core. The winding of a transformer is basically composed of several coils, largely produced from electrolytic copper and as an insulator, receive a layer of synthetic varnish. Already the core, is generally projected from a ferromagnetic material, being the major responsible for effecting the transferred induced current in the primary winding for the secondary winding.

These two elements found in the transformer are considered as the active part, in this way, the other elements of the transformer are part of the complementary components.

Considering transformers with two windings, it is common to call them as primary and secondary winding. However, three winding transformers can be found, considering that the third is tertiary. There are also transformers that only rely on a winding, that is, the primary winding has a connection to the secondary winding, so that there is no insulation between them, these transformers are known as autotransformers.

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A three-phase transformer has three transformers that can be operated in different ways. By activating the primary windings in triangle and the secondary windings in star, one obtains a set in which the primary receives three-phase current and in the secondary, three phases and neutral.

Components

Bimetallic Type Relay

Bimetallic overload relays are components based on the principle of dilatation of thermoelectric parts, also called bimetallic. The operation of a relay is directly based on the different expansions that the metals present, in case they are exposed to a change of temperature. Overload relays are normally used to indirectly protect electrical devices from possible overheating, such as in motors and transformers, for example.

Overheating of an engine can be caused by a number of factors, such as mechanical overload at the tip of its axis, high start time, blocked rotor, lack of one or more phases and excessive deviations of network voltage and frequency, among others.

CEM2531T

In case of any of these situations, the current or over-current increment in the motor must be controlled monitored in all phases by the overload relay. All terminals present in the main circuit of the overload relays shall be marked in the same way as the power terminals of the contactors with specific functions, according to the sequence number, and if there is a second sequence, it shall be identified with zero.

 

Bimetallic Type Relay