Friends, today in this article we will learn about various winding techniques. I am going to give information about all these in a very good way. So let’s start.
Different winding techniques-
The following points should be kept in mind while designing well-arranged and high quality winding for high voltage winding of transformer –
(i) High electrical quality
(ii) excellent mechanical strength
(iii) Good ventilation
(iv) low temperature rise of the windings
Keeping the above points in mind, different types of winding techniques are described as follows.
cylindrical winding
This type of winding is mainly classified into two parts-
(a) With rectangular conductor – Cylindrical winding with rectangular conductor is mainly used in low voltage winding. This type of winding can be wound in single layer or double layer winding. Figure (1) shows double layer winding with oil container in between. This type of winding is generally used up to 6kV and 240 kVA output. Mechanical efficiency is very low in this type of winding.
(b) With circular conductor – Cylindrical winding with circular conductor is used in high voltage winding from 33 kV to 300 kVA voltage. In this, multilayer winding is made by placing paper resistor between the layers and oil is applied between the vessel, winding and insulation cylinder which provides internal cooling to the vessel. This arrangement is shown in Figure (2).
cross-over winding
This type of winding is used for low voltage and low current and in small transformers it is used as high voltage. Due to low current, small circular wire with double-coat cover is used for winding. In this the entire winding is divided into different coils which are connected to each other by insulating spacers, but this type of winding requires more remuneration.
Continuous disc coil type winding
This type of winding is used in modern transformers. These are mainly used up to 200 kV and 10 MV rating. It is also used in low voltage transformers. In this, the winding is mainly wound on a resistive cylinder which is made of bakelite. These coils are insulated from each other by vertical press boards. Each coil of the winding rests on a press board spacer. Increasing the number of spacers increases the diameter of the core. This arrangement is shown in Figure (4).
Disc type winding
This type of winding consists of separate windings having different cross-section areas and using different thickness of insulation. It is mainly used in high voltage transformers of 33 kV or more range.
helical winding
This type of winding is used in transformers with high current and low turns. This situation depends on the low voltage of high capacity transformers. Generally, conductors of rectangular cross section are used in this type of winding. In this, the parallel strength is not less than 4 and not more than 20.
sandwich winding
This type of winding is mainly used in shell type transformers. The winding is arranged on the central lug. The low voltage (LV) and high voltage (HV) coils are arranged one after the other respectively. The low voltage coil is placed near the top and bottom of the yoke so that insulation can be achieved easily. The position of the low voltage and high voltage coils can be understood with the help of Figure (7).
What did you learn today :-
Now you must have known about the different winding techniques and you must have got the answer to all these questions very well.
I hope you liked the information given by me, if you have any question/suggestion in your mind, then you can tell me by commenting below, I will definitely reply to your comment. If you liked this post, then you can also share it with your friends and relatives.