Download E-books Power System Analysis and Design, Fifth Edition PDF
By J. Duncan Glover
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STEP 2 flow the phasors A–N, B–N, and C–N subsequent to the highvoltage Y windings. STEP three for every single-phase transformer, draw a line subsequent to the low-voltage winding that's parallel to the road drawn in Step 2 subsequent to the high-voltage winding. STEP four Label the strains drawn in Step three. for instance, section B, that's hooked up to dotted terminal H2, is proven up online B–N; as a result part b, that's attached to dotted terminal X2, has to be up online b–c. STEP five carry the strains drawn in Step four jointly to shape the negativesequence phasor diagram for the low-voltage D winding. As proven in determine three. 14, the high-voltage phasors lag the low-voltage phasors by means of 30 . hence the negative-sequence part shift is the opposite of the positivesequence section shift. nine The D–Y transformer is often used as a generator step-up transformer, the place the D winding is hooked up to the generator terminals and the Copyright 2010 Cengage studying. All Rights Reserved. will not be copied, scanned, or duplicated, in complete or partly. as a result of digital rights, a few 3rd get together content material could be suppressed from the e-book and/or eChapter(s). Editorial overview has deemed that any suppressed content material doesn't materially impact the general studying event. Cengage studying reserves the best to take away extra content material at any time if next rights regulations require it. a hundred and twenty bankruptcy three energy TRANSFORMERS determine three. 14 instance three. 6— building of negative-sequence phasor diagram for Y–D transformer financial institution Y winding is hooked up to a transmission line. One good thing about a highvoltage Y winding is impartial aspect N is equipped for grounding at the high-voltage part. With a completely grounded impartial, the insulation standards for the high-voltage transformer windings are lowered. The highvoltage insulation may be graded or tapered from greatest insulation at terminals ABC to minimal insulation at grounded terminal N. One good thing about the D winding is that the bad 3rd harmonic magnetizing present, because of the nonlinear middle B–H attribute, is still trapped contained in the D winding. 3rd harmonic currents are (triple-frequency) zero-sequence currents, which can't input or depart a D connection, yet can ﬂow in the D. The Y–Y transformer is seldom used due to di‰culties with 3rd harmonic fascinating present. The D–D transformer has the virtue that one part could be got rid of for fix or upkeep whereas the rest levels proceed to function as Copyright 2010 Cengage studying. All Rights Reserved. is probably not copied, scanned, or duplicated, in entire or partially. as a result of digital rights, a few 3rd occasion content material will be suppressed from the publication and/or eChapter(s). Editorial assessment has deemed that any suppressed content material doesn't materially have an effect on the general studying event. Cengage studying reserves the suitable to take away extra content material at any time if next rights regulations require it. part three. five PER-UNIT an identical CIRCUITS OF THREE-PHASE TRANSFORMERS 121 determine three.