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Amorphous Transformer Features
► Amorphous Transformer
The Amorphous transformer is a power conversion equipment and a High Efficiency Energy and Power Saving Transformer
which reduced the rate of no-load loss more than 75% comparing to the existing transformer due to the adoption of
amorphous metal in steel core instead of the existing grain oriented silicon steel.
► Amorphous Metal
The Amorphous metal is an amorphous magnetic material created from molten metal which is mixed with Fe, B, Si and
others through a rapid cooling process(106 /sec)
- The array of atom is irregularly arranged into amorphous state like liquid state (Random structure)
- Due to the advantage that atom’s rotation is easy to cope with the variation of magnetic field, amorphous metal reduced
the hysteresis loss more than a silicon steel with crystal structure
- Amorphous metal have the high natural resistance (3 times higher than silicon steel) and the thin thickness of material
(about one tenth of silicon steel) enable amorphous metal to reduce the eddy loss
• Hysteresis loss: When a magnetic flux passed through a steel core, friction loss occurred
between Magnetic particles
• Eddy loss: When a magnetic flux passed through a steel core, a loss occurred from an
eddy current
• No load loss: Energy loss resulting from the primary side of transformer is powered
regardless of load existence. This loss always occurs in steel core in
energizing condition
• Load loss: Variable loss with load ratio in the transformer winding. This loss is propotioned
to square of load ratio. This load loss is zero in case of no load
A Hysteresis curve decides the main characteristics of a magnetic material and the cross section of a looped curve shows a
hysteresis loss.
Because the coercivity of amorphous metal is less than a silicon steel and due to the high permeability of amorphous metal
comparing to a silicon steel, decrease hysteresis loss in natural.
► Advantage of Amorphous Transformer
• Miniaturization : Reduced overall dimension by a special winding structure
• Low Heat Generation
- Require the smallest space for installation
- Decrease secular variation of the winding & insulating materials causing by passing years
- Enable minimization of rising temperature in winding to increase capability for overload
• According to loss reduction, get the operation & maintenance cost of the transformer
reduced and make transformer life more extended
• The excellent magnetic characteristic in the high frequency and harmonics band provide
high efficiency and miniaturization
• Environmental improvement effects
- Reduce heat emission by power consumption, prevent global warming
- Environmental Conservation due to the construction reduction of power plant
- Reduce emission of harmful gases
• Transformer certificated by high efficiency energy appliance
► Supporting Programs to promote High Efficiency Energy Certified Transformer
• Grant for the encouragement of Installation (KEPCO www.kepco.co.kr/dsm)
Capacity(kVA) 100 150 200 300 400 500 600 750 1000 1250 1500 2000 2500 3000
Incentive(\1,000) 400 600 700 950 1250 1250 1550 1900 2550 3850 3850 4050 5150 5300
The potential cost-down by power saving between high efficiency & normal transformer is about 430,000 won/KW
Characteristic
Amorphous
Metal
Grain
Oriented
Silicon Steel
Reference
Magnetic
Property
Iron core loss(W/kg) 0.23 1.72
Amorphous
Metal:
Excitation(VA/kg) 0.37 5.2 1.36 Tesla
Magnetization of
saturation,
Tesla(25℃)
1.55 1.86 Silicon Steel:
Resistivity(Ω-㎝) 1.0 45 1.74 Tesla
Physical
Property
Thickness(mm) 25 270~300
Specific
gravity(g/cc)
7.19 7.65
Hardness(Hv) 900 210
• Benefit of tax credit: Deduct 10% of tax amount (the corporation tax and an income tax)
from total investment amount of a year
• Support budget to build facilities : Redemption by installment in five years with a three-year
grace period at 2% annual interest rate (quarterly variable interest rate)
• In accordance with the Prime Minister instruction NO.2005-5, a public institution must use
the high efficiency energy appliance in compulsory
Amorphous Cast Resin Transformer
◎ Standard Spec of Amorphous Molded Type Transformer
Standard Spec
Frequency 60Hz
Classification of insulator High Voltage : B class, Low voltage: F class
Temperature rising of
winding
High Voltage : 80℃, Low Voltage: 100℃
Standard
insulation
level(kV)
Systematic Voltage 24 7.2 3.6 Under 0.6
Withstanding
Voltage of
commercial
cycle
50 20 10 3
Withstanding
Voltage of
Impulse
95 60 40 -
Primary of rated voltage(kV) 22.9 6.6 3.3 -
Primary of tapped voltage(kV)
F23.9-R22.9-
21.9-20.9-19.9
F6.9-R6.6-6.3-6.0-
5.7
F3.45-R3.3-3.15-
3.0-2.85
-
Secondary of rated 6.6, 3.3, 0.48, 0.44, 0.38, 0.22
voltage(kV)
Rated capacity(kVA) 100/ 200 / 300 / 400 / 500 / 600 / 750 / 1,000 / 1,250 / 1,500 / 2,000/3,000
◎ Overall Dimension and Characteristic
▶ 3Φ 22.9kV / 380-220V
▶ 3Φ 6.6kV or 3.3kV / 380-220V
Capacity
(kVA)
Impedence
(%)
No-
load
Load
losses
Efficiency(%) Dimension(mm) Weight
(kg)
20%
load
ratio
50%
load
ratio
100%
load
ratio
W D H
100 4.0 100 1,850 99.14 98.89 98.09 900 640 1,130 610
200 4.0 196 3,050 99.21 99.05 98.40 920 705 1,215 940
300 4.0 231 4,160 99.34 99.16 98.56 990 750 1,395 1,200
400 5.0 228 5,140 99.46 99.25 98.68 990 825 1,360 1,460
500 5.0 256 6,050 99.50 99.30 98.75 1,040 830 1,370 1,510
600 6.0 293 6,720 99.53 99.35 98.84 1,140 850 1,420 1,920
750 6.0 344 8,400 99.55 99.35 98.85 1,160 850 1,590 2,050
1,000 6.0 458 8,970 99.59 99.46 99.07 1,310 870 1,730 2,740
1,250 6.0 556 9,810 99.62 99.52 99.18 1,390 950 1,770 3,220
1,500 7.0 690 12,169 99.61 99.50 99.15 1,520 1,050 1,780 4,200
2,000 7.5 1,200 15,500 99.55 99.50 99.17 1,900 1,070 2,020 5,300
Capacity
(kVA)
Impedence
(%)
No-
load
Load
Losses
Efficiency(%) Dimension(mm) Weight
(kg)
20%
load
ratio
50%
load
ratio
100%
load
ratio
W D H
100 6.0 126 1,960 98.99 98.78 97.96 1,090 760 1,200 730
200 6.0 209 3,300 99.15 98.98 98.28 1,120 835 1,365 1,130
300 6.0 263 4,280 99.28 99.12 98.51 1,200 845 1,445 1,390
400 6.0 304 5,340 99.36 99.19 98.61 1,200 915 1,430 1,610
500 6.0 350 5,970 99.41 99.27 98.75 1,210 910 1,565 1,830
600 6.0 389 7,170 99.44 99.28 98.76 1,290 940 1,640 2,110
750 6.0 459 8,410 99.47 99.32 98.83 1,360 955 1,720 2,520
1,000 6.0 585 9,890 99.51 99.39 98.96 1,440 1,000 1,800 3,050
1,250 6.0 774 10,570 99.52 99.46 99.10 1,500 1,050 1,810 3,480
1,500 6.5 1,020 12,200 99.50 99.46 99.13 1,720 1,160 1,930 4,650
2,000 7.0 1,200 16,000 99.54 99.48 99.15 1,900 1,200 1,900 5,600
