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How to draw Zero sequence circuit of the Transformer in power system analysis. Draw the transformer zero sequence equivalent circuits for the various winding connections. (Nov/Dec-2013)

LINE TO LINE FAULT

SINGLE LINE TO GROUND FAULT (L-G FAULT) Derivation

Two 11 kV,20 MVA, three phase star connected generators operate in parallel as shown in fig. the positive, negative and zero sequence reactance of each being respectively j 0.18,j 0.15,j .10 p.u. The star point of one of the generator is isolated and that of the other is earthed through a 2.0 ohm resistor. A single line to ground fault occurs at the terminals of one of the generators. Estimate ...

For the radial network shown in Fig. three phase Fault occurs at F. Determine the fault current and line voltage at 11KV bus under fault condition.

Prepare a per phase schematic of the system in fig. and show all the impedance in per unit on a 100 MVA, 132 KV base in the transmission line circuit. The necessary data are given as follows. G1 : 50MVA, 12.2KV, X=0.15 pu. G2 : 20MVA, 13.8KV, X=0.15 pu. T1 : 80MVA, 12.2/161KV, X=0.1 pu. T2 : 40MVA, 13.8/161KV, X=0.1 pu. LOAD: 50MVA, 0.8 power factor lag operating at 154KV Determine the PU imped...

The one line diagram of the power System is shown in fig. the three phase power line-line Ratings are given below. G1: 80 MVA, 22KV, X = 9% T1: 50 MVA, 22/220 KV, X = 10% T2 = 40 MVA, 220/ 22 KV, X = 6% T3, T4 = 40 MVA, 22/ 110KV, X = 6.4% Line 1= 200Kv X=121Ω Line 2= 110Kv X=42.35% Motor = 68.85MVA 20 Kv X=22.5% Load: 10 MVA, 4Kv. Draw an impedance diagram showing all impedance in per unit on ...

Draw the impedance diagram for the given fig. Power system analysis Unit 1 problem

Draw the reactance diagram for the power system shown in figure 11 (a) (ii). Neglect resistance and use a base of 100 MVA, 220 KV in 50  line. The ratings of the generator, motor and transformer are given below . Generator : 40 MVA, 25 KV, X" = 20% Synchronous motor : 50 MVA, 11 KV, X" = 30%   Y Transformer : 40 MVA, 33/220 KV, X = 15% Y -  Transformer : 30 MVA, 11/220 KV ( /Y ), X = 15% ....

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