IEEE DRAFT 389 : 1995

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

Covers tests used in determining the significant parameters and performance characteristics of electronic transformers and inductors. Primarily used in all types of electronic applications but may be applied to other types of transformers of large apparent-power rating used in the electric power utility industry.