This standard pertains to small low-power pulse transformers for use in electronic equipment, transmitting peak power of 300 W or less and average power of 5W or less with a peak working voltage of 1000 V or less. These transformers are required to transform unipolar or bipolar pulses of voltage or current within specified tolerances of amplitude and time when operated between specified impedance. This standard is not intended to include low-power switching type pulse transformers which are covered in IEEE Std 272-1970, Standard for Computer-Type (Square-Loop) Pulse Transformers. These transformers depend upon the use of square - loop core material for operation, have memory capability, and normally transmit only bipolar pulses unless provision is made for core flux reset. This standard is not intended to include transformers for power conversion applications. Those transformers will be covered in a related standard. Whenever numerical values are indicated they may be considered as recommended values. Section 2 contains definitions of terms pertaining primarily to functional testing of low-power pulse transformers, and Section 5 contains equivalent circuits and definitions of associated terms. Section 6 describes preferred transformer test methods and the appendix contains alternate test methods.
- Status
- Superseded Standard
- Board Approval
- 1973-12-13
- History
-
- Published:
- 1975-06-18
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295-1969
IEEE Standard for Electronics Power Transformers
Application guidance and test procedures are given for power transformers and inductors that are used in electronic equipment and supplied by power lines or generators of essentially sine-wave or polyphase voltage. Provision is made for relating the characteristics of transformers to the associated rectifiers and circuits. This standard includes, but is not limited to, the following transformers and inductors: rectifier supply transformers for either high- or low-voltage supplies, filament and cathode heater transformers, transformers for alternating-current resonant charging circuits, inductors used in rectifier filters, and autotransformers with fixed taps.
390-1987
IEEE Standard for Pulse Transformers
Pulse transformers for use in electronic equipment are considered. This standard applies to the following transformer types: power output (drivers), impedance matching, interstage coupling, current sensing, and blocking-oscillator transformers. For these transformers, the peak power transmitted ranges from a few milliwatts to many kilowatts, and the peak voltage transmitted ranges from a few volts to many kilovolts. Symbols, performance tests, equivalent circuits, preferred test methods, marking, and service conditions are covered.
436-1991
IEEE Guide for Making Corona (Partial Discharge) Measurements on Electronics Transformers
A uniform procedure for making corona (partial discharge) measurements by electrical means on electronic transformers is presented. Methods of applying voltage stress, the use of a sine-wave voltage to simulated dc and ac combinations, the types and limitations of voltage stresses encountered, and the acceptable limits of discharge pulse energy are included. Recommended test conditions and the need for negotiation of special tests are discussed. Test apparatus and calibration are described. The aim is to establish a common ground of understanding between transformer and systems design engineers and transformer manufacturers in the development of service and performance requirements.
449-1998
IEEE Standard for Ferroresonant Voltage Regulators
Ferroresonant transformers used as regulators in electronic power supplies and in other equipment are covered. Guides to application and test procedures are included.