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RALE Design Examples
of
Power Transformer and Inductor Applications

Description 
File 
1 
How we do design small
power transformers

CAL0001E.pdf 
2 
Inherently shorttcircuitproof, potted safety
power transformer
up to 10VA, 50Hz

CAL0002e.pdf 
3 
Not shortcircuitprooflow profile safety power transformeras,protected by a miniature fuse,18VA, 50Hz

CAL0003e.pdf 
4 
Noninherently shorttcircuitproof,protected by
thermal fuse, safety halogen lamp power transformer, 60VA, 50Hz

CAL0004e.pdf 
5 
Rectifier safety
power transformer for feed to voltage controllers
of
5Vdc, 1Adc and 2x12Vdc,0.1Adc with RCload

CAL0005e.pdf 
6 
Threephase rectifier, safety
power transformer for 24Vdc,
80Adc supply with RC load

CAL0006E.pdf 
7 
Low inrush current
universal control power transformer, 800VA,50Hz

CAL0007E.pdf 
8 
8000VA
power transformer for medical premises

CAL0008e.pdf 
9 
50kHz, 1200VA
power transformer

CAL0009E.pdf 
10 
100kHz, flyback transformers
for input voltage125700Vdc and power up to 500W

CAL0010E.pdf 
11 
250kHz, 120W forward transformer with voltage controller,
for input voltage range 200V to 350V

CAL0011E.pdf 
12 
Low inrush current
three phase universal autotransformer
for 10kVA continuous output power

CAL0012E.pdf 
13 
Motor starting
threephase power autotransformer for 100kVA continuous motor power

CAL0013E.pdf 
14 
Nonshortcircuitproof,
low profile safety transformers up to 42VA,in accordance with IEC 61558,protected by miniature fuse as per IEC 127

CAL0014E.pdf 
15 
About the
resonance transformer 1200W, 50kHz


Nr. 
Description 
File 
1 
Designing a simple 50kVA, 50Hz, 3 phase
power transformer, in metric


2 
Designing a 3 phase 500kVA, KFactor=20,
3x480V /3x208V /120V (DYn),60Hz,power transformer,in USA unita


3 
Designing a 3 phase, 50/60Hz rectifier transformer (YYD to suppress
5.and 7.current harmonics ) with 2 parallel connected bridge
rectifiers for Udc=400V, Idc=1000A


4 
Designing a 3 phase, 50/60Hz rectifier
autotransformer (YZZ to suppress
5.and 7.current harmonics ) with 2 parallel connected bridge
rectifiers for Udc=400V, Idc=1000A 

5 
Designing a 3 phase (Y0Y0Y12), 50Hz, high current rectifier
transformer for Udc=12Vdc, Idc=30000Adc


6 
Designing a
1600kVA, 35kV, 50Hz Distribution Oil Transformer


7 
Designing a
and 1600kVA, 35kV, 50Hz Distribution Oil Transforme and Oil Tank


8

Creatung Input to Design the Rectifier Transformers 

9

Creating a
4 lines 3 phases net in a 3 lines 3 phases net
using Zn transformer


10 



Designing a single phase, 1kVA, 50/60Hz transformer with cooling
channels 


Designing a 3 phase,1MVA, 50Hz, "dry" distribution transformer
3x35kVA/3x400V 


Designing a single phase,100VA, 50Hz, transformer for duty cycle
operation mode 10secondsON, 10 minutes OFF 










Rale's Technical Papers
Nr. 
Description 
File 
1 
Constant Current Transformer


2 
Transformer UIDesign


3 
Balancing 3 phase net wit a single phase Load


3 
Rale's workshop on CWIEME 2008 in Chicago
This Rale workshop approaches the design of transformers for a
Transformer Manufacturer from point of view of a buyer and/or user
of transformers. To demonstrate these applications, Rale selected
about 20 design examples as follows:
Workshop.pdf
7.7MB
 Designing inherently shortcircuitproof, potted safety
transformers 12V, 0.166A in accordance with IEC 61558
 Designing inherently current limited, potted safety
transformers 10V, 5A in accordance with UL 1585 Class 2
 Designing inherently current limited single phase
transformer 24V, 100A with integrated inductor
 Designing high voltage ,potted transformers 10kV, 0.1A,
1500Hz
 Designing mixed operation mode transformer, 230V/115V, 10A
in autotransformer and 230V/115V, 10A galvanic separated
connection
 Designing three phase autotransformer, for 3x400V/3x380V,
10kVA output power and 25% one phase unsymmetrical load
 Designing three phase, low inrush current universal
autotransformer for 3x208V/120V, 50/60Hz, 9A
 Designing rectifier transformer for battery charger 6Vdc,
40dc
Designing rectifier transformer for welding with 26Vdc, 200Adc
Designing the audio transformer for loudspeaker 25W, 16_Ohm
Designing flyback transformer for capacitor charger 10kVdc, 0.1
µF, 50W
 Designing a 500 kVA, 60Hz, KFactor, three phase dry
transformer with cooling channels?
 Designing a 3 phase, 50/60Hz rectifier transformer (YYD to
supress 5. and 7. harmonics) with 2 parallel connected bridge
rectifiers, for Udc = 400V and Idc = 1000A
 Designing a 12Vdc, 30kAdc Rectifier Transformer
 Designing a 1600kVA/35kVA, 50Hz Distribution Oil
Transformer
 Designing Water Cooled Inverter Filter Choke, 0.5mH,
600Arms, 60Hz
Power Factor Correction Chokes
 Commutation Chokes
Smoothing Chokes
LCFilter Chokes
Current Compensated Chokes
The concept is to assist the Transformer Manufacturers to
incorporate transformer designs as an integral part their business
and also for the Transformer Manufacturers to get a better overview
about new applications that they could be easily integrated in their
production using Rale's design software. For this reason Rale has
included very powerful design guidelines, for instance relating to
water cooling, high voltage spacing, etc.

Workshop.pdf
7.7MB 
4 
New
About Scott
Transformers


5 
New
About LeBlanc
Transformer


6 
About 3 Phases to 1
Phase via VConnection
About
Cabinet


7 
Recalculate some transformer parameters into the autotransformer
parameter














