![Page 1: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/1.jpg)
Chapter 3 Transformer
By Sintayehu Challa
![Page 2: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/2.jpg)
By Sintayehu Challa
![Page 3: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/3.jpg)
By Sintayehu Challa
![Page 4: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/4.jpg)
By Sintayehu Challa
![Page 5: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/5.jpg)
![Page 6: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/6.jpg)
By Sintayehu Challa
![Page 7: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/7.jpg)
By Sintayehu Challa
![Page 8: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/8.jpg)
By Sintayehu Challa
![Page 9: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/9.jpg)
By Sintayehu Challa
![Page 10: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/10.jpg)
By Sintayehu Challa
![Page 11: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/11.jpg)
By Sintayehu Challa
![Page 12: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/12.jpg)
By Sintayehu Challa
![Page 13: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/13.jpg)
By Sintayehu Challa
![Page 14: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/14.jpg)
By Sintayehu Challa
![Page 15: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/15.jpg)
By Sintayehu Challa
![Page 16: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/16.jpg)
By Sintayehu Challa
![Page 17: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/17.jpg)
By Sintayehu Challa
![Page 18: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/18.jpg)
By Sintayehu Challa
![Page 19: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/19.jpg)
By Sintayehu Challa
![Page 20: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/20.jpg)
By Sintayehu Challa
![Page 21: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/21.jpg)
By Sintayehu Challa
![Page 22: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/22.jpg)
By Sintayehu Challa
![Page 23: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/23.jpg)
By Sintayehu Challa
![Page 24: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/24.jpg)
By Sintayehu Challa
![Page 25: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/25.jpg)
By Sintayehu Challa
![Page 26: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/26.jpg)
By Sintayehu Challa
![Page 27: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/27.jpg)
By Sintayehu Challa
![Page 28: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/28.jpg)
By Sintayehu Challa
![Page 29: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/29.jpg)
By Sintayehu Challa
![Page 30: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/30.jpg)
By Sintayehu Challa
![Page 31: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/31.jpg)
By Sintayehu Challa
![Page 32: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/32.jpg)
By Sintayehu Challa
![Page 33: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/33.jpg)
By Sintayehu Challa
![Page 34: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/34.jpg)
By Sintayehu Challa
![Page 35: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/35.jpg)
By Sintayehu Challa
![Page 36: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/36.jpg)
By Sintayehu Challa
![Page 37: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/37.jpg)
By Sintayehu Challa
![Page 38: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/38.jpg)
By Sintayehu Challa
![Page 39: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/39.jpg)
By Sintayehu Challa
![Page 40: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/40.jpg)
By Sintayehu Challa
![Page 41: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/41.jpg)
By Sintayehu Challa
![Page 42: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/42.jpg)
By Sintayehu Challa
![Page 43: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/43.jpg)
By Sintayehu Challa
![Page 44: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/44.jpg)
By Sintayehu Challa
![Page 45: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/45.jpg)
PIN
By Sintayehu Challa
![Page 46: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/46.jpg)
By Sintayehu Challa
![Page 47: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/47.jpg)
By Sintayehu Challa
![Page 48: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/48.jpg)
By Sintayehu Challa
![Page 49: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/49.jpg)
By Sintayehu Challa
![Page 50: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/50.jpg)
Three phase transformer’s Winding
connection
Three phase transformer’s primary and secondary windings basically have four types of connection and these are:
1. Star - star:
• This is the most economical connection for small, high voltage transformers, as the number of turns per phase and the amount ofinsulation is minimum.
• The possibility of utilizing both star pints for a fourth wire may be useful. Third harmonics is absent from the line voltage; unless there is a fourth wire, no third-harmonic current will flow.
• If the transformer is worked at the normal flux density, however, the neutral potential will oscillate, while the third-harmonic phase voltage may be high for shell type three phase units.
• The connection is almost satisfactory with the three-phase core type while for other types, the provision of a tertiary winding stabilizes the neutral conditions.
![Page 51: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/51.jpg)
Contd.2. Delta – delta:
• This is an economical connection for large, low-voltage transformers in which insulation is not a problem cause
• This connection increases the number of turns per phase and reduces the necessary sectional area of conductors.
• In delta-delta connection, large unbalance of load can be met without difficulty; the closed mesh will damp out third-harmonic voltages. Also, should one of the phases develop a fault,
• it is possible to operate the transformer at 58 % of its rating in delta connection.
• In the contrary, the absences of a star- point may be disadvantageous.
![Page 52: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/52.jpg)
Contd.
3. Star - delta: • The star/delta arrangement is very common for
power supply transformers. • It has the advantage of a star-point for mixed
loading, and delta winding to carry third harmonic currents, which stabilizes the star-point potential.
• If the H.V. winding is the star-connected side, there is some saving in cost of insulation.
• A delta-connected H.V. winding is almost universal.
![Page 53: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/53.jpg)
Contd.
4. Delta-star:
• In this connection, there is a reduction in the third harmonic voltage and at the same time unbalanced loading is permitted;
• on account to the type of connection, however, the delta has to be confined to a fairly low voltage winding.
• The delta/star connection has been employed where delta connections were mechanically weak (because of large number of turns and small copper sections) in high voltage transformers
![Page 54: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/54.jpg)
By Sintayehu Challa
![Page 55: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/55.jpg)
By Sintayehu Challa
![Page 56: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/56.jpg)
By Sintayehu Challa
![Page 57: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/57.jpg)
By Sintayehu Challa
![Page 58: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/58.jpg)
By Sintayehu Challa
![Page 59: Chapter 3 Transformer - Electrical and Computer … · Three phase transformer’s Winding connection Three phase transformer’s primary and ... the provision of a tertiary winding](https://reader033.vdocument.in/reader033/viewer/2022052713/5b8769677f8b9a435b8b5710/html5/thumbnails/59.jpg)
By Sintayehu Challa