220kV triple-winding no-load voltage regulation autotransformer

Rated capacity (kVA)

Voltage combination and tap range (kV)

Bonding group

No-load loss (kW)

Load loss (kW)

Short circuit impedance (%)

No-load current (%)

High pressure

Medium pressure

Low pressure

Step-up

Step-down

Step-up

Step-down

Step-up transformer

Step-down transformer

31500

220

242±2 ×2.5%

115

121

6.6

10.5

1135

37

38.5

YNyn0d11

25

22

117

99

High-Medium

H-M

12-14

High-Low

H-L

8 to 12

Medium-Low

M-L

14 to 18

High-Medium

H-M

8-10

High-Low

H-L

28-34

Medium-Low

M-L

18 to 24

0.50

40000

29

26

144

121

0.50

50000

34

30

170

144

0.43

63000

40

36

201

171

0.43

90000

50

46

276

234

0.36

120000

10.5

11

13.815.75

18

35

37

38.5

62

56

340

288

0.36

150000

70

60

405

342

0.33

180000

80

72

464

387

0.33

240000

95

86

595

504

0.25