Question

1) Each 3-phase transformer in the power system provided in the figure consists of 3 1-phase transformers. Power system; a) Draw positive, negative and zero array equivalent circuits with element values. b) In the middle of $L_{57}$ two phase-Earth failures occurred. Breakdown impedance 5 dur stop. Phase find currents.

          1) Each 3-phase transformer in the power system provided in the figure consists of 3 1-phase
transformers. Power system;
a) Draw positive, negative and zero array equivalent circuits with element values.
b) In the middle of $L_{57}$ two phase-Earth failures occurred. Breakdown impedance 5 dur stop.
Phase find currents.

1) Each 3-phase transformer in the power system provided in the figure consists of 3 1-phase
transformers. Power system;
a) Draw positive, negative and zero array equivalent circuits with element values.
b) In the middle of L57 two phase-Earth failures occurred. Breakdown impedance 5 dur stop.
Phase find currents.

Added by Matthew F.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Christopher Dzorkpata

Step 1

To draw the equivalent circuits, we need to consider the impedance values and connections of the transformers and transmission lines. Positive Sequence Equivalent Circuit: In the positive sequence equivalent circuit, all the impedances are connected in series. Show more…

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Each 3-phase transformer in the power system provided in the figure consists of 3 1-phase transformers. Power system; a) Draw positive, negative, and zero array equivalent circuits with element values b) In the middle of Ls7, two phase-Earth failures occurred. Breakdown impedance 5 dur stop Phase find currents tt 3E G2 Y (3) T2 (4) (2) (i) T1 L35 3E T3 (6) G L27 L5T (2) S (MVA) 200 200 200 200 200 200 200 200 200 200 200 200 V (kV) 15 13.8 15 15 15/115 13.8/115 15/115 115 115 115 115 115 X. 0.06 0.06 0.06 0.05 0.2 0.25 0.3 0.3 0.4 0.5 0.45 0.475 x 0.2 0.2 0.2 0.1 0.2 0.25 0.3 0.15 0.17 0.21 0.19 0.18 X2 0.14 0.14 0.14 0.1 0.2 0.25 0.3 0.27 0.29 0.3 0.31 0.28 Zn 0.05 G1 G2 G3 M T1 T2 T3 L23 L26 L34 L36 L46 0.045