Notes
SIEMENS Pakistan
Internship Report
Internship Report
By
Mahmood Ali Korai (BU-Tr)
Page 1 of 13
SIEMENS Pakistan
Internship Report
Index
Topic
Page
Transformer
3
Workshop
4
Construction
4
a. Core
5
b. Winding
6
i. Layer winding ii. Disc Winding
c. Tap changer
Testing of Transformer
a. On load test
b. Impedance Test
c. Lightening Impulse Test
d. Atmosphere
Page 2 of 13
SIEMENS Pakistan
Internship Report
Transformer
(Ali, 2012) Transformer:
Transformer is an electrical machine that transfers electrical energy from one circuit to another by the principle of electromagnetic induction. While transferring electrical energy, its frequency does not change. When the transformer raises the voltage i.e. when the output voltage of transformer is higher than input voltage, it is called step up transformer and when its output is lower than input, then it is called step down transformer. The distribution transformer is the step down transformer that reduces the voltage to domestic use. Since, its basic construction requires no moving parts, so it is often called static transformer and it is very rugged machine requiring the minimum amount of repair and maintenance. Owing to the lack of rotating parts there is no friction or winding losses. Further, the losses are relatively low, so that the efficiency of a transformer is high.
Typical transformer efficiencies at full load lie between 96% and 97% and with extremely large capacity of transformers the efficiencies are as high as
99%.
Process to Manufacture Transformer
1. Core cutting
2. Core laying
3. Winding (HV & LV)
Page 3 of 13
SIEMENS Pakistan
Internship Report
4. Semi Assembly
5. Final Assembly
6. Testing
Workshop
According to SIEMENS standard, SIEMENS manufactures distribution transformers ranges from 500kVA to 4MVA for private customers. SIEMENS manufactures
10kVA, 15kVA, 25kVA, 50kVA, 100kVA, 200skVA, 400kVA &
Internship Report
Internship Report
By
Mahmood Ali Korai (BU-Tr)
Page 1 of 13
SIEMENS Pakistan
Internship Report
Index
Topic
Page
Transformer
3
Workshop
4
Construction
4
a. Core
5
b. Winding
6
i. Layer winding ii. Disc Winding
c. Tap changer
Testing of Transformer
a. On load test
b. Impedance Test
c. Lightening Impulse Test
d. Atmosphere
Page 2 of 13
SIEMENS Pakistan
Internship Report
Transformer
(Ali, 2012) Transformer:
Transformer is an electrical machine that transfers electrical energy from one circuit to another by the principle of electromagnetic induction. While transferring electrical energy, its frequency does not change. When the transformer raises the voltage i.e. when the output voltage of transformer is higher than input voltage, it is called step up transformer and when its output is lower than input, then it is called step down transformer. The distribution transformer is the step down transformer that reduces the voltage to domestic use. Since, its basic construction requires no moving parts, so it is often called static transformer and it is very rugged machine requiring the minimum amount of repair and maintenance. Owing to the lack of rotating parts there is no friction or winding losses. Further, the losses are relatively low, so that the efficiency of a transformer is high.
Typical transformer efficiencies at full load lie between 96% and 97% and with extremely large capacity of transformers the efficiencies are as high as
99%.
Process to Manufacture Transformer
1. Core cutting
2. Core laying
3. Winding (HV & LV)
Page 3 of 13
SIEMENS Pakistan
Internship Report
4. Semi Assembly
5. Final Assembly
6. Testing
Workshop
According to SIEMENS standard, SIEMENS manufactures distribution transformers ranges from 500kVA to 4MVA for private customers. SIEMENS manufactures
10kVA, 15kVA, 25kVA, 50kVA, 100kVA, 200skVA, 400kVA &