![]() Small size, lower cost & high efficiency is the main advantage of Autotransformer. there are no electrical isolation between the coil and the secondary voltage is the result of the self-induction as well as electrical conduction. The turns of the coil are divided in fixed proportion which acts as primary and secondary at the same time. Such type of transformer has only one coil. The tertiary winding is used for providing reactive power where necessary or supplying auxiliary load with different voltage & power levels. Don’t confuse this with 3 phase transformer because 3 phase transformer has only 2 winding i.e. They are mostly used for connecting transformer in parallel to increase their capacity.Īpart from primary and secondary winding, there is another winding called tertiary winding which is why it is known as three winding transformer. If the current leaves the primary dotted terminal, the voltage induced in the secondary dotted terminal will be negative. if the current enters the primary dotted terminal, the voltage induced in the secondary dotted terminal will be positive. The winding polarity in a transformer is denoted by the dot convention. #TRANSISTOR SYMBOL FULL#The voltage between the center tap point & any end of the winding is half of that of the full winding. Each winding offers different turn ratio providing access to two different current ratings on each individual windings.Ī center tapped transformer has a tap point in the center of the secondary winding which let us access half the number of turns in the secondary winding. This is a dual core current transformer that has two cores each with individual secondary winding. The double core of the transformer increases the rating of the transformer.ĭual Core Current Transformer with Two Secondary Lines There is a single conductor (primary) going though both of the cores of the transformer. Such type of current transformer has two cores. The current produced in its secondary is proportional to the current in its primary (conductor) & it is measured by connecting it with a conventional Ammeter. Such type of transformers is used for current control in welding applications.Ĭurrent transformer is a type of instrument transformer used for decreasing high alternating current in a line down to safe levels for measurement purposes. Such type of transformer has an adjustable core which increases or decreases the flux linkage between the windings to increase or decrease the current flow. Also ferrite has very low electrical conductivity which decreases the eddy current losses occurring inside the core. The ferrite is a magnetic material having very high magnetic permeability which increases the flux inside the core of the transformer. This symbol represents a transformer made up of ferrite core. Thus they are used for low frequency applications. The disadvantage of iron core is eddy current loss (core loss) which depends on supply frequency. The iron has high magnetic permeability which allows it to carry high magnetic flux thus increasing the induction between the windings. The core of this transformer is made up of iron. During saturation, the reactance decreases that result in increasing of the current flow. The core saturation is controlled using DC control winding. Core saturation is the point where the core is fully magnetized and producing maximum flux. This is a type of transformer whose core can be saturated on purpose. There are core losses in magnetic core that increases with frequency which is why air core transformer is used for radio frequency applications. An air core transformer has no magnetic core, instead the winding is wound around a plastic (nonmagnetic material) or there is no core at all. These symbols represent air core transformer. ![]()
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