Table of Contents

1 Scope and references
1.1 Scope
1.2 References
1.3 Typical transformer types to which this standard
      applies
1.4 Related transformer standards
2 Definitions
3 Symbols
3.1 Pulse transformer schematics
3.2 Input pulse - source voltage pulse applied through
      associated impedance or source current pulse
3.3 Output pulse - transformed voltage pulse or load
      current pulse
3.4 Source and load impedance
3.5 Transformer parameters
4 Performance tests
4.1 Electric strength
4.2 Induced voltage electric strength
4.3 Direct-current insulation resistance
4.4 Ratio of transformation (turns ratio)
4.5 Polarity
4.6 Direct-current resistance of windings referred to
      25 deg C
4.7 Short-circuit impedance (leakage inductance)
4.8 Open-circuit parameters (magnetizing pulse
      inductance and exciting current)
4.9 Open-circuit admittance (distributed capacitance)
4.10 Voltage-time product rating
4.11 Direct capacitance between windings
4.12 Balance
4.13 Functional test
4.14 Corona (partial discharge) tests
4.15 Temperature rise test
5 Equivalent circuits
5.1 Complete equivalent circuit for a pulse
      transformer
5.2 Partial equivalent circuits for a pulse
      transformer
5.3 Pulse transformer tests to determine equivalent
      circuit elements
5.4 Pulse response parameters under load
6 Preferred test methods
6.1 Ratio of transformation (turns ratio) test method
6.2 Short-circuit impedance (leakage inductance) test
      method
6.3 Open-circuit admittance (distributed capacitance)
      test methods
6.4 Open-circuit impedance (magnetizing pulse
      inductance and exciting current) test method
6.5 Voltage-time product test method
6.6 Three recommended balance test methods
6.7 Temperature rise test
6.8 Corona (partial discharge) test
7 Marking
8 Service conditions
9 Bibliography
Figures
1 Input pulse shape
2 Pulse-transformer schematics
3 (a) Complete equivalent circuit for a pulse
           transformers
      (b) Alternate form of complete equivalent circuit
           for a pulse transformer
4 (a) Asymmetrical B-H loop
      (b) Symmetrical B-H loop
5 (a) Pulse leading edge (pulse first transition)
           partial equivalent circuit for pulse
           transformer with a>>
      (b) Response of circuit (a) to applied step
           function
6 (a) Pulse top partial equivalent circuit for
           pulse transformer
      (b) Response to circuit (a) to constant voltage E
7 (a) Pulse-trailing edge (pulse last transition)
           partial equivalent circuit for pulse
           transformer
      (b) Response of circuit (a) to pulse leading edge
8 Series method of a test circuit for measuring
      ratio of transformation
9 1/(f squared) as a function of added capacitance
10 Example of a test circuit for the recommended
      method of determining magnetizing pulse inductance
11 Recommended test circuit for rectangular pulse
      excitation using a pulse modulator
12 Exciting current waveform
13 Departure of exciting current waveform
14 Balance tests
Appendix
A Alternate test methods
Appendix Figures
A1 Alternate ratio bridge test circuit for measuring
      ratio of transformation
A2 Alternate single-winding excitation and calibrated
      variable inductor null test circuit for measuring
      ratio of transformation
A3 Transformer output voltage waveform after pulse
      shock excitation

Abstract

Pertains to pulse transformers for use in electronic equipment.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Institute of Electrical & Electronics Engineers
Pages
ISBN
Supersedes	IEEE 391 : 1976