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The Voltech Handbook of Transformer Testing

Description
This article covers a wide range of transformer theory and Voltech's testing capability.
The Voltech Handbook of Transformer Testing
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Expand 1 Transformer Basics1 Transformer Basics
Expand 2 Available Tests2 Available Tests
Collapse 3 Examples of Different Transformer Types3 Examples of Different Transformer Types
3.0 Constructing A Test Program
3.1 Using The Editor Software To Create Test Programs
3.2 Testing Line Frequency Transformer
3.3 Testing Miniature Line Frequency Bobbin Transformers
3.4 Testing Switched-Mode Power Supply Transformers
3.5 Pulse Transformer
3.6 Testing Audio Transformers
3.7 Current Transformers
3.8 DC Chokes

3. Examples of Test Criteria for Different Transformer Types

3.0 Constructing A Test Program

The test program for a particular transformer can be downloaded from a PC compatible computer using the Editor and Server Software.

In most programs it is better to perform a resistance test on each winding first, as this will allow the continuity checks to verify the fixture wiring as soon as possible.

Following this, tests can be placed in any order required.


However, for some transformers with high permeability cores, it is possible for the resistance test to leave the cores with residual magnetism, which will cause a subsequent inductance test to measure a value that is out of tolerance.In such cases, it is best to perform the inductance test first.

Alternatively, perform a turns ratio test after the resistance test - this will demagnetize the core before the inductance test.

When a new transformer type is being tested, it is better initially to set up the AT SERIES to produce a full report for each test.

After enough transformers have been tested to ensure that sensible limit values have been programmed for each test, then the report format can be changed to "failures onlyF which is the normal report format in a production situation.

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