AS 2732-1984

1 - AS 2732-1984 GUIDE TO THE LIGHTNING IMPULSE AND SWITCHING IMPULSE TESTING OF POWER TRANSFORMERS AND REACTORS
4 - PREFACE
5 - CONTENTS
7 - 1. Scope
7 - 2. General
8 - 3. Specified wave-shapes
8 - 4. Test circuit
9 - 5. Calibration
10 - 6. Lightni ng impulse tests
10 - 6.1 Wave-shapes
10 - 6.2 Impulses chopped on the tail
10 - 6.2.1 Time to chopping
11 - 6.2.2 Rate of collapse and amplitude of reversed polarity of the chopped impulse
11 - 6.3 Terminal connections of the test object and methods of failure detection
12 - 6.4 Test procedures
12 - 6.5 Oscillographic recording
12 - 6.5.1 General
13 - 6.5.2 Recording of voltage
13 - 6.5.3 Recording of current
14 - 7. Switchi ng impulse tests
14 - 7.1 Special requirements
14 - 7.2 Transformers
14 - 7.2.1 Wave-shapes
14 - 7.2.2 Terminal connections of the test object and methods of failure detection
15 - 7.2.3 Test procedures
16 - 7.2.4 Oscillographic recording
17 - 7.3 Reactors
17 - 7.3.1 Wave-shapes
17 - 7.3.2 Terminal connections of the test object and methods of failure detection
17 - 7.3.3 Test procedures
17 - 7.3.4 Oscillographic recording
18 - 8. Interpretation of oscillograms
18 - 8.1 Lightning impulse
18 - 8.1.1 Voltage oscillograms - Full-wave tests
19 - 8.1.2 Current oscillograms - Full-wave tests
20 - 8.1.3 Voltage and current oscillograms - Chopped-wave tests
20 - 8.2 Switching impulse
20 - 8.2.1 Voltage oscillograms
20 - 8.2.2 Current oscillograms
25 - APPENDIX A - PRINCIPLES OF WAVE-SHAPE CONTROL
25 - A1. High impedance windings
26 - A2. Low impedance windings
30 - APPENDIX B - TYPICAL OSCILLOGRAPHIC RECORDS
31 - SUMMARY OF EXAMPLES ILLUSTRATED IN OSCILLOGRAMS
31 - Lightning impulse tests
31 - Switching impulse tests

Provides guidance on procedures for lightning and switching impulse testing of power transformers to supplement the requirements of AS 2374, Power transformers, Part 3, Insulation levels and dielectric tests. It is also generally applicable to the testing of reactors. Technically identical with IEC 722.

The purpose of this guide is to give guidance and explanatory comments on the existing procedures for lightning and switching impulse testing of power transformers to supplement the requirements of I E C Publication 76-3: Power Transformers, Part 3: Insulation Levels and Dielectric Tests. The contents of this guide are also generally applicable to the testing of reactors, see I E C Publication 289: Reactors, modifications to power transformer procedures being indicated where required. Information is given on wave-shapes, test circuits including test connections, earthing practices, failure detection methods, test procedures, measuring techniques and interpretation of results. Where applicable, the test techniques are as recommended in I E C Publication 60: High-voltage Test Techniques.

Reconfirmed 1994