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Dry Type Isolating Transformers

AET Electric PTE LTD

K-Factor Isolation Transformer

Dry Type Transformers

AET Electric Pte Ltd , 18 Kaki Bukit Road 3 #01-05 Singapore 415978

+ 65 62988550, FAX: + 65 62996069

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Dry Type Isolating Transformers

" A Manufacturer

of High Quality Transformers in Singapore "

Manufacture and sale of transformers, mainly dry type, with a wide and diverse areas ranging from electronic manufacturing,data centers, marine, petrol chemical industries and offshores applications. We have been manufacturing transformers since 1980. Through the years of dedication to this highly specialized field, our company had acquired knowledge and experiences in this field. We work with a variety of clients including engineers, architects, facilities personnel, and end-users. Industries we serve include financial, education, manufacturing, utility, communications, broadcasting, government and even retail.

Our Quality

We had achieved approvals from recognized international bodies from ABS(American Bureau of Shipping), LR(Lloyd's Registrar), DNV, BV(Bureau Veritas) , NKK(Nippon Kaiji Kyokai), RINA, GL(German Lloyd), RMRS and PSB

We adopt strict quality assurance and control measures in our manufacturing process to ensure consistency and realiabilty in our products and services to meet the needs and requirements of our customers. We had also been awarded the ISO9001:2000 Certification in design, manufacture and repair of transformers. Certified by DNV(Det Norske Veritas) Cert no. 3202-2007-AQ-SIN-RVA

With our complete setup and quality assurance, we are flexible and capable to meet your special requirements.

AET Electric Pte Ltd , 18 Kaki Bukit Road 3 #01-05 Singapore 415978

+ 65 62988550, FAX: + 65 62996069

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Dry Type Isolating Transformers

Why Choose AET transformers?

Our competitive advantage lies on · Our vast experience in designing our transformer · Use of highest quality materials · Stringent testing procedure · Short leadtime · ISO certified and manufactured in Singapore · After sales service

High Grade Iron Core · High Grade, Cold rolled, Grain Oriented steel sheet with low specific losses, insulated on both sides by thin organic coating from Kawarin, Japan High Grade Copper Windings · Copper Strips with 200oC enameled coated from Invex,Italy. The copper conductors are fully sized, transposed and shaped to minimize Eddy current losses. Insulation Materials · Class H(NOMEX from Dupont) Insulation material is used between overlapping layers. · Axial channels are used between layers of primary and secondary winding to provide air gap for uniform cooling. · High temperature tolerant fiberglass boards are used as bobbins to separate the core and windings. · Fully impregnated with class H varnish and oven dried. Terminals · Tinned Copper Busbar (For 100KVA and above) Protection Devices(Optional) · Thermal protection devices · Thermister (Normally Closed, activated at 160oC) · Digital Temperature Controller with 2 x Voltage Free contacts · Inrush Current Limiter (Available in Auto or Semi-Auto Type) Temperature Controller,TR42 Testing Procedure · Insulation Test at 1000Vdc and · Hi-potential test at 3KV · Resistance Test · Open circuit Test (No-load Test) · Short circuit Test · Temperature Rise Test · Noise Level Test

AET Electric Pte Ltd , 18 Kaki Bukit Road 3 #01-05 Singapore 415978

+ 65 62988550, FAX: + 65 62996069

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Dry Type Isolating Transformers

Why use K-Factor transformers?

Harmonics are generated by the use of computers, servers and non-linear devices. These harmonics will cause excessive heating and degrade the insulation materials in the transformer which eventually lead to transformer failure.

Determine K-Factor

Defination(From UL1561) A rating applied to a transformer indicating its suitability for the use of non sinsodial loads. In other words,

K - Factor = I h ( PU ) h 2

2 h =1

Where Ih(PU) is the rms current(in per unit) at harmonic,h h is the harmonic order

Example of The Load Capability of a K13 Transformer(From IEEE C57.110-1998 Section 6)

Harmonic order

h

PU rms current

1 3 5 7 9 11 13 15 17 19 21 23 25

Ih(PU)

1.000 0.333 0.200 0.143 0.111 0.091 0.077 0.067 0.058 0.053 0.477 0.043 0.040

Ih(PU)2

h2

1 9 25 49 81 121 169 225 289 361 441 529 625

1.00000 0.11111 0.04000 0.02040 0.01234 0.00826 0.00592 0.00444 0.00346 0.00277 0.00227 0.00189 0.00160

Ih(PU)2 h2

1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0

Summation,

1.21448

DC loss Factor

13

K-Factor

Harmonics Effects on Transformer

The presence of harmonics will cause the increase in losses and heating. They will incease both the load loss(impedance loss) and no-load loss(excitation). a) Load Loss Load Loss includes skin effect, inceased winding eddy current(PEC), I2R(PDC) and stray losses(POSL) From IEEE C57-110, total load loss consist mainly winding eddy current loss, and I2R loss. Stray losses can be neglected in dry type transformer b) No Load Loss No load loss is increased due increasing of hysterisis loss . The presence of harmonics increase the flux density and the rate of change of core magnetization which result in increased of hyterisis loss.

AET Electric Pte Ltd , 18 Kaki Bukit Road 3 #01-05 Singapore 415978

+ 65 62988550, FAX: + 65 62996069

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Dry Type Isolating Transformers

In Our Design

In order to reduce the effects of harmonics, our K-Type Transformers ,DTKFTM series are specially designed

For Load Loss

· · · · · · Parallel individual insulated copper conductors are used to reduce skin effect and eddy current losses Larger conductors are used to reduce I2R losses Static Shield between the PRI & SEC winding to reduce electrostatic noise caused by the harmonics Well ventilated by using axial channels and internally gapped per turn winding 200% neutral conductor to handle zero sequence currents flow To reduce hysterisis loss, our transformer is deisgned at a lower flux density and use of high grade iron core.

For No Load Loss

For Low Inrush Current

· · Deisgned at a lower flux density and use of high grade iron core with hgh core saturation point. Primary winding is wound externally to increase the primary impedance path

Our Transformer Construction

200% Neutral Conductor Tinned Busbar High Grade Iron Core Earth Stud Electro-Static Shielding(Optional) Axial Channels for better Ventilation & Isolate pri & sec Parallel use of Enameled Coated Copper Strip Fully impregnated varnish and oven dried.

Internally Gapped per turn winding For better Ventilation and prevent internal short circuit

AET Electric Pte Ltd , 18 Kaki Bukit Road 3 #01-05 Singapore 415978

+ 65 62988550, FAX: + 65 62996069

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Dry Type Isolating Transformers

Our Complete System MAINS

Inrush Current Limiter (Semi Auto or Auto Type) For Extra Safe Turn on

Temperature Controller,TR42S1 For 3phase Monitoring TR42C1 (Remote Monitoring)

PT100 sensors

Warning Trip Contact, L1 Shut Down Trip Contact, L2

Cooling Fans (Temp Controlled)

LOAD

AET Electric Pte Ltd , 18 Kaki Bukit Road 3 #01-05 Singapore 415978

+ 65 62988550, FAX: + 65 62996069

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Dry Type Isolating Transformers

Specifications ­ K13

Rated Power (Kva) Rated Primary Voltage Secondary Voltage (At No Load) Voltage Regulation Input Voltage Tolerance Rated Current Frequency Vector Group Insulation Type Test Voltage Enclosure Protection Degree Max Ambient Temperature( c) Max Allowable Temperature Rise( c) Approx Impedance Voltage (%) Standard in accordance Approx Losses (W) No-load Iron losses On-Load Copper losses

O O

40 400Vac

60

70

80

100

120

180

200

250

300

400Vac(230Vac-N) Neutral Conductor Size 200% bond to ground < 2% +10% 58 45-65Hz Dyn11(-30 deg Phase Shift) / Dzn0( Zero phase Shift) H 3kVac, 1 min IP21 40 120 <5 IEC 60076-11 ; IEEE C57-110 ; UL1561 250 600 350 900 400 1100 450 1300 600 1500 750 1700 900 2800 1000 3000 1100 4500 1300 5800 ie ( 0V to 440V) 87 101 115 144 173 260 289 360 433

Specifications ­ K13

Rated Power (Kva) Rated Primary Voltage Secondary Voltage (At No Load) Voltage Regulation Input Voltage Tolerance Rated Current Frequency Vector Group Insulation Type Test Voltage Enclosure Protection Degree Max Ambient Temperature( c) Max Allowable Temperature Rise( c) Approx Impedance Voltage (%) Standard in accordance Approx Losses (W) No-load Iron losses On-Load Copper losses

O O

400 400Vac

500

600

700

800

900

1000

1200

1500

2000

400Vac(230Vac-N) Neutral Conductor Size 200% bond to ground < 2% +10% 577 45-65Hz Dyn11(-30 deg Phase Shift) / Dzn0( Zero phase Shift) H 3kVac, 1 min IP21 40 120 <5 IEC 60076-11 ; IEEE C57-110 ; UL1561 1300 5700 1500 6800 1700 7500 1850 8500 1950 11000 2050 15000 2200 18000 2500 22000 3000 28000 5000 35000 ie ( 0V to 440V) 721 866 1010 1154 1300 1443 1732 2165 2886

AET Electric Pte Ltd , 18 Kaki Bukit Road 3 #01-05 Singapore 415978

+ 65 62988550, FAX: + 65 62996069

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Dry Type Isolating Transformers

Winding Schematic

PRIMARY

1U 1V 1W 1U 1V

PRIMARY

1W

2U

2V

2W

2N(200%) E

2U

2V

2W 2N(200%)

E

SECONDARY Vector Group : Dyn11

SECONDARY Vector Group : Dzn0

Dimensions and weights

Rated power (kVA) Dimensions (mm) W1 W2 W3 D H1 H2 Approx Weight (Kg)

40 300 400 650 500 100 650 280

60 300 400 700 550 100 750 450

70 400 500 750 550 100 750 500

80 560 660 800 600 100 850 600

AET Electric Pte Ltd , 18 Kaki Bukit Road 3 #01-05 Singapore 415978

+ 65 62988550, FAX: + 65 62996069

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Dry Type Isolating Transformers

Dimensions and weights

Rated power (kVA) Dimensions (mm) W1 W2 W3 D H1 H2 No of fans Approx Weight (Kg)

100 560 660 950 600 100 950 Nil 600

120 560 660 950 600 100 950 2x4" 700

180 600 700 1050 800 100 1250 2x6" 950

200 600 700 1100 800 100 1350 2x6" 1100

250 700 800 1250 850 100 1350 3x6" 1300

300 750 850 1300 900 100 1350 3x6" 1600

400 850 950 1400 900 100 1500 4x6" 1800

500 850 950 1400 900 100 1500 4x6" 2000

Rated power (kVA) Dimensions (mm) W1 W2 W3 D H1 H2 No of fans Approx Weight (Kg)

600 900 1000 1600 1000 100 1600 4x6" 2400

700 1000 1100 1700 1150 100 1600 6x4" 2800

800 1000 1100 1800 1200 100 1600 6x6" 3000

900 1000 1100 1800 1200 100 1700 6x6" 3500

1000 1000 1100 2000 1300 100 1800 4x12" 4000

1200 1000 1100 2000 1300 100 1900 4x12" 5000

1500 1050 1150 2000 1400 100 2000 6x12" 5500

2000 1050 1150 2200 1500 100 2100 8x12" 6000

AET Electric Pte Ltd , 18 Kaki Bukit Road 3 #01-05 Singapore 415978

+ 65 62988550, FAX: + 65 62996069

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