Lightning Studies of Transformers by the Cathode Ray Oscillograph

Brand, F. F.; Palueff, K. K.

doi:10.1109/t-aiee.1929.5055340

Cited by 22 publications

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“…(5). • • Ibid., (17), (18). wave-shape and the effect on the low-voltage winding of a transformer when an impulse strikes the highvoltage winding, and LaceyJ has added to Blume and Boyajian's theory the effect of the resistance of the winding.…”

Section: Hi-mentioning

confidence: 99%

The effects of impulse voltages on transformer windings

Allibone¹,

McKenzie²,

Perry³

1937

Journal of the Institution of Electrical Engineers

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TABLE OF CONTENTS-continued. SUMMARYThe effects of the application of impulse voltages of varied wave-shapes to transformers are analysed theoretically and experimentally. Single and multiple transients have been considered, and oscillographic tests have been made on model transformers of different winding characteristics, and on both single-phase and 3-phase transformers. The constants of the transformers important for determining the voltage distribution within the windings due to Ihe impact of a surge have been calculated and measured, and the effect of altering these constants has been examined. In general, good agreement has been obtained between theory and experiment. The transference of surges from one winding to another has been briefly considered, and the testing of transformers with impulse voltages has been discussed in the light of the foregoing analytical study. TABLE OF CONTENTS(1) Introduction.(2) Theoretical Treatment. (3) Technique of Measurement. (a) Description of experimental transformers. (b) Measurement of constants of winding. (c) Impulse-generator circuit for voltage-distribution tests. (d) Initial voltage distribution. (e) Check on the oscillographic technique. (4) Applications of Impulses to a Model Transformer. (a) Initial voltage distribution. (6) Subsequent voltage distribution. (c) Effect of wave-front of applied impulse. (d) Effect of wave-tail of applied impulse. (e) Effect of winding resistance. (/) Effect of removing transformer from its tank. (g) Effect of addition of series capacitance.(h) Effect of earthing the transformer through an impedance not equal to zero. Effect of isolating the neutral point, and of applying impulses to both ends of the winding. Effect of a discontinuity in the winding such as occurs at a tap-changing point. Effect of reinforced coils, (m) Effect of static end ring.

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Section: Hi-mentioning

confidence: 99%