1 Scope
1.1 Specific Types of Transformers and Inductors to
Which This Recommended Practice Is Applicable
1.2 References
2 Definitions
3 How to Specify Electronic Transformers
4 Insulation and Corona Tests
4.1 General
4.2 Electric Strength Test (Also Known as Hi-Pot
test)
4.3 Induced Potential Test
4.4 Corona Test
5 Resistance Tests 16
5.1 General
5.2 Resistance Values Under 1 Ohm
5.3 Resistance Values from 1 ohm to Many Kilohms
5.4 Resistance Values for Under 1 Ohm to Many
Kilohms
6 Loss Measurements
6.1 No-Load Loss
6.2 Excitation Apparent-Power Measurements
6.3 Stray-Load Losses
6.4 Short-Circuit Power Test
6.5 Efficiency and Power Factor
7 Ratio of Transformation
7.1 General
7.2 Measurement Methods
7.3 Impedance Unbalance
7.4 Balance Tests
7.5 Polarity Tests
8 Transformer Capicitance
8.1 General
8.2 Interwinding Capacitance
8.3 Distributed Capacitance
8.4 Bridge Methods
9 Inductance Measurements by Impedance Bridge Method
9.1 General
9.2 Method of Measurement
10 Transformer Response Measurements
10.1 Transformer Frequency Response
10.2 Transformer Pulse Response
11 Noise Tests
11.1 Test Conditions for Audible Noise
11.2 Measurement of Audible Noise
11.3 EMI Noise
12 Terminated Impedance Measurements
12.1 General
12.2 Return-Loss Method
13 Temperature Rise Tests
13.1 Test Methods
13.2 Notes on the Technique of Measurement
14 Self-Resonance
14.1 General
14.2 Measurement
15 Voltage-Time Product Rating
15.1 General
15.2 Voltage-Time Product Test Method
16 Shielding
16.1 Electronic Shielding
16.2 Magnetic Shielding
17 Measurement of Quality Factor Q
17.1 Definition
17.2 Methods
17.3 Bridge Measurements
17.4 Q-Meter Measurements
17.5 Transmission Method
17.6 Damped Oscillation Method
18 Common-Mode Rejection Test
19 Inrush-Current Evaluation and Measurement
19.1 Measurement
19.2 Calculation
19.3 Other Considerations
20 Current Transformer Test
20.1 General
20.2 Recommended Test Procedure for Current-
Transformation Ratio and Phase Angle
21 Bibliography
FIGURES
Fig 1 to Fig 54
TABLES
Table 1 Recommended Tests and Specifications for
Specific Transformer Groups
Table 2 Suggested Values for Specifying No-Load Tests
Table 3 Sound-Level Corrections for Noise Tests
APPENDIXES
Appendix A Instrumentation for Voltage and Current
Measurements on Inductors and Transformers
A1. General
A2. True rms Measurements
A3. Flux Voltage Measurements
A4. Applications
Appendix B AC High-Potential Dielectric Testing
B1. General
B2. Leakage Current
B3. Corona
B4. Breakdown
B5. Test Equipment Requirement
Appendix C An AC Magnetic Field Pickup Probe