220kV level capacity: 31500kV·A~240000kV.A three-phase double winding on-load voltage regulating power transformer

Rated capacity kV · A

Voltage combination level grading range

Bonding Group Label

No-load loss kW

Load loss kW

No-load current %

Short circuit impedance %

High pressure classification range kV

Low voltage kV

31500

220±8×1.25%

230±8×1.25%

6.3

6.6

10.5

21

36

37

38.5

10.5

21

36

37

38.5

66

69

Ynd11

17

115

0.57

12 to 14

40000

20

134

0.57

50000

24

161

0.53

63000

28

188

0.53

90000

35

246

0.45

120000

43

304

0.45

150000

51

360

0.41

180000

59

413

0.38

120000

45

303

0.45

150000

53

355

0.41

180000

62

406

0.38

240000

77

504

0.3

Note 1: Low voltage 35kV transformers are also available upon request.

Note 2: When the annual average load rate of the transformer is about 50%, the highest operating efficiency can be obtained by using the loss values in the table.