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close this bookElectrical Machines - Basic Vocational Knowledge (IBE - Deutschland; 144 pages)
View the documentIntroduction
Open this folder and view contents1. General information about electrical machines
Open this folder and view contents2. Basic principles
Open this folder and view contents3. Execution of rotating electrical machines
Open this folder and view contents4. Synchronous machines
Open this folder and view contents5. Asynchronous motors
Open this folder and view contents6. Direct current machines
Open this folder and view contents7. Single-phase alternating current motors
close this folder8. Transformer
Open this folder and view contents8.1. Transformer principle
Open this folder and view contents8.2. Operational behaviour of a transformer
close this folder8.3. Three-phase transformer
View the document8.3.1. Three-phase transformation with single-phase transformers
View the document8.3.2. Three-phase transformers
View the document8.3.3. Vector groups
View the document8.3.4. Application of three-phase transformers in power supply
View the document8.3.5. Parallel operation of transformers
View the document8.3.6. Technical data of customary transformers
 

8.3.6. Technical data of customary transformers

The surveys 22 and 23 feature the index figures of several mains and distribution transformers.

Survey 22 - Characteristic values of distribution transformers (three-phase oil transformer)

Rated power

kVa

100

160

250

400

630

1000

1600

Rated uppervoltage

kV

(6; 10; 15; 20)

(6; 10; 15; 20; 30)

(6; 10; 15; 20; 30)

Adjustment range

%

± 4

± 5

± 5

Rated undervoltage

kV

(0.231; 0.4; 0.525)

(0.4; 0.525)

(0.4; 0.525; 6.3)

Idling losses

W

380

550

700
(740)

1000
(1050)

1450
(1550)

2200
(2400)

3200
(3400)

Short circuit losses

W

2200
(2300)

2900
(3200)

4400

5900

7800

11000

16000

Short circuit voltage

%

3.8
(4)

 

6

6

6

6

6

Dimensions length a 1

mm

1110

1260

1810
(1870)

1980
(2040)

2110
(2170)

2300
(2350)

2650
(2800)

width b

mm

640

800

800
(880)

1100

1100

1000

1000

height h1

mm

1420

1590

1870
(1900)

1950
(2000)

2215
(2255)

2490
(2600)

2700
(2775)

Oil filling

kg

215

300

470
(570)

620
(700)

755
(860)

1150
(1250)

1550
(1750)

total weight

kg

790
(800)

1070
(1080)

1520
(1680)

2020
(2200)

2620
(2850)

4000
(4250)

5750
(5950)

Vector group

-

(Yy0; Yz5)

(Yy0; Dy5)

(Yy0; Dy5)

Survey 23 - Characteristic values of dry-type transformers

Rated power

kVa

63

100

160

250

400

630

1000

Rated upper-voltage

kV

(2; 3; 5; 6; 10; )

(2; 3; 5; 6; 10; )

rated under-voltage

kV

(0,231; 0,4; 0,525)

(0,4; 0,525)

Rated frequency

Hz

(50)

(50)

Idling losses

W

580

750

900

1200

1750

2500

2900

Short-circuit losses

W

1330

1700
(1780)

2570
(2750)

3200

5250

6500

10400

Short-circuit voltage

%

(3, 8(4))

(6)

Figure 146 serves as an example of the dimensional size of a three-phase oil transformer.


Figure 146 - Oil transformer for the 250 - 16000 kVA range

1 Oil level, 2 Thermo-pockets, 3 Oil removal device, 4 Converter, 5 Eye bolt, 6 Earthing screw, 7, 8 Oil opening, 9 Buchholz relay, 10 Stop valves (from 1000 kVA onwards), 11 Shoulder hooks, 12 Hoisting points, 13 Variable dimensions

Questions for revision and control

1. Describe the basic construction and range of a transformer.
2. How can iron and winding losses be determined in a transformer?
3. How can short-circuit voltage be determined?
4. Which factors cause a voltage drop in a transformer?
5. What is the significance of the index figure in vector group data? Which index figures are cited?
6. Which are the most common vector groups and for which purposes are they used?
7. Name the parallel switching conditions.

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