DC Machines.
The figure below shows an example of iron core transformer.The transformers are also classified according to the type of core they use. It is an electromagnetic device which follows the basic principle of electromagnetism discovered by Michael Faraday. At a constant level of frequency and variation of voltage level, the transformer transfers AC power from one circuit to the other circuit. This is commonly seen in laboratories. A single winding is taken to which both the sides are connected to power and the ground. The distribution transformers are designed for maximum efficiency of 60 to 70%The current and potential transformer is explained below in detailThe potential transformer is also called as the voltage transformer.
They are larger in size as compared to the distribution transformer.At a very high voltage, the power cannot be distributed to the consumer directly, so the power is stepped down to the desired level with the help of step-down power transformer.
The insulated laminations minimizes eddy current losses in the iron core. We have covered about Transformers construction and operation in detail in previous tutorial. Mainly installed at the generating stations and transmission substations. The ratings of the power transformer are as follows 400 KV, 200 KV, 110 KV, 66 KV, 33 KV. The magnetic flux linkages are made through This is a core type transformer in which the windings are wound on an iron core. Such transformers are named as Based on the type of winding technique, we have another transformer which is very popular named as the This is type of transformer which is mostly seen in our electrical laboratories.
The transformer is not loaded fully hence the core loss takes place for the whole day, but the copper loss is based on the load cycle of the distribution network.If the power transformer is connected in the transmission network, the load fluctuation will be very less as they are not connected at the consumer end directly, but if connected to the distribution network there will be fluctuations in the load.The transformer is loaded for 24 hours at the transmission station, thus, the core and copper loss will occur for the whole day. Here we will cover different types of transformers used in different types of applications. Induction Motor. If (VStep down transformer converts a high primary voltage associated with the low current into a low voltage, high current. A transformer is a widely used device in the electrical and electronics domain. These are actually This is a core type transformer in which the windings are wound on a non-magnetic strip. This auto transformer is an improved version of the original transformer. Circuit Globe All about Electrical and Electronics. A practical auto transformer looks like the figure below.By rotating the shaft above, the secondary voltage is adjusted to different voltage levels.
With this type of transformer, the number of turns in the primary winding is greater than the number of turns in the secondary winding. The classification of transformers can also be done depending upon the type of core material used. It is less costly to assemble three single-phase transformer to form a three-phase transformer than to purchase one single three-phase transformer. Circuit Theory. This oil is cooled from outside by various methods. If the voltage applied across the points A and C is V1, then the voltage per turn in this winding will be$$V_{2}\:\:=\:\:\frac{V_{1}}{N_{1}}\:\:\times\:\:N_{2}$$$$\frac{V_{2}}{V_{1}}\:\:=\:\:\frac{N_{2}}{N_{1}}\:\:=\:\:constant\:(say\:K)$$This constant is nothing but the turns ratio or voltage ratio of the auto transformer.
Resin impregnated paper and oil is used for the insulation purpose.The various types of the distribution transformer are categorized on the following basis and are shown in the figure belowAs it does not work for constant load throughout 24 hours as in the daytime its load is at its peak, and during the night hours it is very lightly loaded thus the efficiency depends on load cycle and is calculated as All Day Efficiency. I have been really curious about this because my uncle has been talking about buying a split core current transformer for the second-hand AC units that he bought. Various tapping of secondary winding are drawn to select various voltage levels at the secondary side.The primary winding as shown above is from A to C and the secondary winding is from B to C whereas the variable arm B is varied to get the required voltage levels. The three-phase transformer connection can be done by Star (Wye) and Delta (Mesh) type.The connection of primary and secondary winding can be done by various combinations shown belowThe combination of the primary winding and the secondary winding is done as star-star, delta-delta, star-delta and delta-star.To know about the rating of the transformer, you may refer the following links.One of the reasons is that there are 2 major losses in a transformer : load loss which depends on current(A) and no-load loss which depends on voltage(V)Transformer rating in kva becouse the losses in transfomer determined by V and IThanks for helping me understand that a current transformer will be able to change the current from high to the desired value. Electrical Machines. Special Machines. If (VThe power transformers are used in the transmission networks of higher voltages. The magnetic flux linkages are made strong and perfect with iron as core material. These are actually RF transformers, which contain many types such as Air-core transformers, Ferrite coretransformers, Transmission linetransformers and Baluntransformers. The power transformer is cost-effective when the power is generated at low voltage levels. The winding to which AC supply is given is termed as Primary winding and in the secondary winding, the load is connected.If the three single-phase transformer is taken and connected together with their all the three primary winding connected to each other as one and all the three secondary windings to each other, forming as one secondary winding, the transformer is said to behave as a three-phase transformer, that means a bank of three single-phase transformer connected together which acts as a three-phase transformer.Three-phase supply is mainly used for electric power generation, transmission and distribution for industrial purpose.