IEEE 390-1987 (R2007) pdf download

12-27-2020 comment

IEEE 390-1987 (R2007) pdf free download.IEEE Standard for Pulse Transformers.
IEEE 390-1987 pertains to pulse transformers for use in electronic equipment. For the various types of these transformers, the peak power transmitted ranges from a few milliwatts to kilowatts and the peak voltage transmitted ranges from a few volts to many kilovolts.
These transformers are required to transmit unipolar or bipolar pulses of voltage or current within specified tolerances of amplitude and time when operated between specified impedances. They are typically used as coupling devices in electronic circuits. In blocking oscillators, they are connected to provide positive feedback in the circuit. In radar or similar use, they are used to couple the modulator to a magnetron, a klystron, a traveling-wave tube or a cross-field amplifier load.
Whenever numerical values are indicated in this standard, they may be considered as recommended values. Section 6 describes the preferred transformer test methods and Appendix A contains alternate test methods.
1.2 References
This standard shall be used in conjunction with the following publications:
[1] ANSI/IEEE Std 100-1984, IEEE Standard Dictionary of Electrical and Electronics Terms.
[2] ANSI/IEEE Std 111-1984, IEEE Standard for Wide-Band Transformers
[3] ANSI/IEEE Std 260-1978(R 1985), IEEE Standard Letter Symbols for Units of Measurement(SI Units, Customary Inch-Pound Units and Certain Other Units).
[4] ANSI/IEEE Std 268-1982, American National Standard for Metric Practice..
[5] ANSI/IEEE Std 280-1985, IEEE Standard Letter Symbols for Quantities Used in Electrical Science and Electrical Engineering.
[6] ANSI/IEEE Std 315-1975 (CSA Z99-1975) IEEE Graphic Symbols for Electrical and Electronics Diagrams.
[7] ANSI/IEEE Std 315A-1986, IEEE Standard-Supplement to Graphic Symbols for Electrical and Electronics Diagrams.
4.1 Electric Strength
This test applies to insulation between windings. between windings and core, and between windings and case.
NOTE — Transformer windings with graded insulation or windings internally or externally grounded or operated at direct voltages to ground with one terminal etTectively at ground shall be tested by the induced voltage method (see 4.2).
The transformer shall withstand a sinusoidal test voltage applied for a period of one minute between each winding and all other windings and (when applicable) the core or case. The test frequency shall be 60 Hz or an alternative frequency agreed upon between the manufacturer and user (see 4.1.5).
The terminals of the winding under test shall be strapped together, and the terminals of all other windings shall be grounded and (when applicable) connected to the core or case.
Transformer windings operating at a peak working voltage below 25 V shall have a root-mean-square test voltage applied equal to twice the peak working voltage plus 15 V.IEEE 390-1987 (R2007) pdf download.

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