1. Institute of Electrical Engineering, Chinese Academy of Sciences, Haidian District, Beijing 100080, China; 2. Technical Center of Tebian Electric Apparatus Stock Co., Ltd, Changji 831100, China
A 630-kVA 10.5 kV/0.4 kV three-phase high temperature superconducting (HTS) power transformer was successfully developed and tested in a live grid. The windings were wound by hermetic stainless steel-reinforced multi-filamentary Bi2223/Ag tapes. The structures of primary windings are solenoid with insulation and cooling path among layers, and those of secondary windings consist of double-pancakes connected in parallel. Toroidal cryostat is made from electrical insulating glass fiber reinforced plastics (GFRP) materials with room temperature bore for commercial amorphous alloy core with five limbs. Windings are laid in the toroidal cryostat so that the amorphous core operates at room temperature. An insulation technology of double-half wrapping up the Bi2223/Ag tape with Kapton film is used by a winding machine developed by the authors. Fundamental characteristics of the transformer are obtained by standard short-circuit and no-load tests, and it is shown that the transformer meets operating requirements in a live grid.
Corresponding Author(s):
WANG Yinshun,Email:yswang@ncepu.edu.cn
引用本文:
. Development and test in grid of 630 kVA three-phase high temperature superconducting transformer[J]. Frontiers of Electrical and Electronic Engineering in China, 2009, 4(1): 104-113.
Yinshun WANG, Xiang ZHAO, Junjie HAN, Huidong LI, Yin GUAN, Qing BAO, Xi XU, Shaotao DAI, Naihao SONG, Fengyuan ZHANG, Liangzhen LIN, Liye XIAO. Development and test in grid of 630 kVA three-phase high temperature superconducting transformer. Front Elect Electr Eng Chin, 2009, 4(1): 104-113.
convoluted core of 5 limbs with 3 phases/ amorphous alloy core
diameter/mm
396
net cross-section/cm2
815.03
height (Hw)/mm
870
width (Mo)/mm
780
flux density/T
1.275
turn voltage/(V·turn-1)
23.09
weight/kg
3736
no-load loss/W
1031.1
Tab.1
parameter
value
tape thickness/mm
0.32(+/-0.02)
tape width/mm
4.8(+/-0.2)
filament number
55
critical current*/A
>115
maximum rated tensile stress**/MPa
265
maximum rated tensile strain**/%
0.4
minimum bend diameter**/mm
70
hermetic performance
withstand 16 hours on 30 standard atmosphere in liquid nitrogen (LN2)
Tab.2
Fig.1
Fig.2
Fig.3
winding name
parameter
type and value
HV
winding type
solenoid
layer No.r
8
turn No.
262
diameter (inner/outer)/mm
488/504
height/mm
342.5
LV
winding type
double-pancake
double-pancake No.
23
turn No.
10
diameter(inner/outer)/mm
581/608
height/mm
355
balanced winding
winding type
solenoid
diameter(inner/outer)/mm
400/440
layer No.
2
turn No.
10
height/mm
122.4
Tab.3
Fig.4
Fig.5
Fig.6
Fig.7
parameters
design value
winding voltage(HV/LV)/kV
10.5/0.4
winding current(HV/LV)/A
34.64/909.33
balanced winding voltage /V
230
balanced winding current/A
228
iron core
diameter/mm
396
height(HW)/mm
870
width(M0)/mm
780
flux density/T
1.275
cryo-stat
diameter(inner/outer)/mm
410/760
height/mm
680
operating temperature/K
77
operating frequency/Hz
50
% impedance
2.45%
vector group
Yyn0+d7
max. leak flux/mT
65.6
Tab.4
Fig.8
temperature
HV winding/W
LV wing/W
room temperature
12.49
1.25×10-2
77 K
2.65×10-3*
1.32×10-4*
Tab.5
parameters
design value
test value
capacity/kVA
630
630
no-load test
excited current
1.15%
1.36%
transformation ratio
26.25
26.25
core loss*/W
1031.1
1090
load test
% impedance
2.45%
2.74%
winding loss**/W
121.8
110.67
inductive withstand voltage
100 Hz, 30 s
pass
insulation level
HV 28 kV 60 sLV 5 kV 60 sbalanced 5 kV 60 s
pass
rush current
10 times rush current 0.2 s
no-quench
Tab.6
Fig.9
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