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Document
086-627
Name

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

3.2 Testing Line Frequency Transformer


Bobbin wound transformer ;Part Number 1797 - 12VA

This transformer is tested using a plug-in fixture.

Although this transformer uses only 9 terminals, the fixture has all 10 terminals connected so that the fixture can be used with any other transformer designed on the same bobbin.

The fixture program describes the relationship between the terminal name on the plug-in socket and the AT SERIES node that it has been wired to. It allows the test program that is written for the transformer, and all test results, to refer to the transformer terminal names.

Recommended measurements for line frequency transformers

Test

Why?

Winding Resistances To ensure correct wire size has been used and correct tension during winding. Checks that transformer properly installed in test fixture
Magnetizing Current and Open Circuit Voltages Checks for correct core material and core construction. Ensures that operating on correct point on B-H curve.
Leakage Current Open circuit voltage tests confirm that
windings have correct turns and have
correct phasing
Insulation Resistance Only required on transformers used in
patient contact in medical applications
Hi-Pot Checks isolation between windings

Checks safety isolation
primaries to secondaries (and to core if
required)
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Contact Voltech
USA 1-239-437-0494
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or
Email Voltech
 
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