S1 0474

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Prague, 8-11 June 2009

Sato, Terada, Nagata, Kurita, Matsuda, Fukui, Azuma and Hasegawa; Session1 Paper 0474

Development of Distribution

Transformer Based onNew Amorphous Metal

A. SATO & H. TERADAChubu Electric Power Co., Inc - Japan

T. NAGATA & S. KURITAAichi Electric Co., Ltd - Japan

Y. MATSUDA & K. FUKUIHitachi Industrial Equipment SystemsCo., Ltd - Japan

D. AZUMA & R. HASEGAWAMetglas, Inc - USA

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INTRODUCTION

The movement toward low loss transformeris now a worldwide trend.

The no-load loss of amorphous metal-based

AMT is about that of silicon-steel based

SIT.

A new amorphous alloy, Metglas2605HB1material, has a high saturation induction

(Bs=1.65 T) and a high-squareness ratio.


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INTRODUCTION

A distribution transformer has beendeveloped using, Metglas2605HB1alloy and its characteristics andperformance are described.

We examined the aging characteristics

of the AMTs operated for an extendedperiod of time (~18 years).


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0500

100015002000

10 20 30 40 50 60 70 80 90 1002

Xasreh(CP Aged

X-ray Diffraction Patterns

0500

10001500

2000

10 20 30 40 50 60 70 80 90 1002Xasreh(CP Initial

2605SA1

2605SA1

Year 0

Year 16


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Aging Properties

10

100

1.84 1.86 1.88 1.90 1.92

1/T (10-3

K-1

)

Timeconstant(days)

2605HB1

2605SA1

=oexp -Ea/kBT

Insulation paper

(Y: life time, : hot spot temp)

Core (: time, T:temperature)

Kinetics:

Arrhenius type

Ea: Activation energy

kB: Boltzmann const.

95 6Y

Yo=2


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Change of No-load loss over time


-20%

-10%

0%

10%

20%

0 5 10 15 20Aging period (Years)

R

ateofCh

ange(%)

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Characteristics of Transformer Core Materials

Sato et al; Session1 Paper 0474

Corematerial

Tankdiameter

Height Mass No-loadloss

Loadloss

Noiselevel

SA1 100 100 100 100 100 100

HB1 92 96 87 77 98 111

G.O.steel 95 96 81 277 99 94

Specification of Prototypes

Comparison: scaled to SA1 at 100

Corematerial

Bs

(T)

Hc

(A/m)

(Mm)

P13/50

(W/kg)

s

(ppm)

(mm)

SA1 1.56 2.0 1.3 0.070 27 0.025

HB1 1.64 1.5 1.3 0.063 27 0.025

G.O.steel 2.03 45.0 0.5 0.440 -1 0.23

G.O.steel value at 1.6T

1 60Hz 6600/210-105V 20kVA

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Appearance of developed items

Developed

AMT

SITThe current

AMTSato, Terada, Nagata, Kurita, Matsuda, Fukui, Azuma and Hasegawa; Session1 Paper 0474

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0

500

1000

1500

2000

10 20 30 40 50 60 70 80 90 1002

X-raystrength(CPS)

0

500

1000

1500

2000

10 20 30 40 50 60 70 80 90 100

2

X-raystrength(CPS)

X-ray diffraction pattern2

Initial2605HB1

2605HB1 Equivalent

50years

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Estimated Change of No-load Loss under 50-year-equivalent accelerated deterioration test condition

- 10%

- 5%

0%

5%

10%

0 10 20 30 40 50

Equivalent years(Years)

Rateofc

hange(%)


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25

30

35

40

45

50

55

0 5 10 15 20Aging period (Years)

Noiselevel(dB)

Noise Level of AMTs

25

30

35

40

45

50

55

0 10 20 30 40 50Equivalent years (Years)

Noiselevel(dB)

(1) Aged item (2) Accelerated

deterioration item

Standard level Standard level


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CONCLUSION

We have developed a distribution transformer

that uses newly developed Metglas2605HB1. This transformer has the samesize as its silicon steel-based counterpart and

exhibits the same high energy-efficiency asthat of a typical amorphous metal-based unit.

We confirmed the long-term reliability of

AMTs. We are now planning to install our new AMTs

in practical fields in 2009.


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Thank you for your attention.


S1 0474

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