L-26(TB)(ET) ((EE)NPTEL) - Module 7 Transformer Version 2...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Module 7 Transformer Version 2 EE IIT, Kharagpur
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Lesson 26 Three Phase Transformer Version 2 EE IIT, Kharagpur
Background image of page 2
Contents 26 Three phase transformer 4 26.1 Goals of the lesson ………………………………………………………………. 4 26.2 Three phase transformer …………………………………………………………. 4 26.3 Introducing basic ideas …………………………………………………………. . 4 26.3.1 A wrong star-star connection …………………………………………. 7 26.3.2 Bank of three phase transformer ……………………………………… 7 26.3.3 3-phase transformer – a single unit ……………………………………. . 12 26.4 Vector Group of 3-phase transformer …………………………………………… 12 26.5 Tick the correct answer …………………………………………………………. . 14 26.6 Problems…………………………………………………………………………. . 15 Version 2 EE IIT, Kharagpur
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
26.1 Goals of the lesson Three phase system has been adopted in modern power system to generate, transmit and distribute power all over the world. In this lesson, we shall first discuss how three number of single phase transformers can be connected for 3-phase system requiring change of voltage level. Then we shall take up the construction of a 3-phase transformer as a single unit. Name plate rating of a three phase transformer is explained. Some basic connections of a 3-phase transformer along with the idea of vector grouping is introduced. Key Words : bank of three phase transformer, vector group. After going through this section students will be able to answer the following questions. Point out one important advantage of connecting a bank of 3-phase transformer. Point out one disadvantage of connecting a bank of 3-phase transformer. Is it possible to transform a 3-phase voltage, to another level of 3-phase voltage by using two identical single phase transformers? If yes, comment on the total kVA rating obtainable. From the name plate rating of a 3-phase transformer, how can you get individual coil rating of both HV and LV side? How to connect successfully 3 coils in delta in a transformer? 26.2 Three phase transformer It is the three phase system which has been adopted world over to generate, transmit and distribute electrical power. Therefore to change the level of voltages in the system three phase transformers should be used. Three number of identical single phase transformers can be suitably connected for use in a three phase system and such a three phase transformer is called a bank of three phase transformer . Alternatively, a three phase transformer can be constructed as a single unit.
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 16

L-26(TB)(ET) ((EE)NPTEL) - Module 7 Transformer Version 2...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online