Lab7b-PSCAD-InruchCurrentAndLineEnergizing

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California Polytechnic State University, Pomona *

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4821L

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Electrical Engineering

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Dec 6, 2023

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pdf

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Uploaded by ProfessorTapirPerson388

1 / 4 LAB 7B ECE 4821L Inrush current and line energizing T3.1 Create a folder called c:……/. Save the case T_03_a.psc . Open the capacitor main breaker R3. Keep all other breakers closed. Make the ‘fault’ component inactive. Most transient studies require the accurate modeling of transformers and transmission lines. Transformer inrush requires the accurate modeling of the non-linear iron core. Switching transient studies require the modeling of transmission lines to include the effects frequency dependent line parameters and traveling wave phenomena. T3.2 Use detailed models to represent the 33/230 kV transformer and the 55 km transmission line. The transformer has a Y-Y configuration and consists of three single phase units. The no load current is 1 %. The no load and copper losses are 0.003 pu and 0.002 pu respectively. The conductor arrangement of the line is as shown below. Use the frequency dependent phase model to represent the line. 30 [m] 10 [m] C1 C2 C3 10 [m] Ground_Wires: 1/2"HighStrengthSteel Conductors: chukar Tower: 3H5 10 [m] 0 [m] 5 [m] G1 G2 Fig.1. 230 kV Transmission tower.

2 / 4 RL V F Ph RRL P2 Q2 Q2 Wind Farm a BRK1A BRK2 Timed Breaker Logic Open@t0 BRK2 E1 I1 I1 E1 E1 BRK3 60.0 3 Phase RMS Three Phase RMS Voltage Meter Fault inception - 0.4 s and at 0.404 s 230 kV Voltage support Cap. Bank GT230 Timed Fault Logic BRK3 Timed Breaker Logic Open@t0 #1 #2 Line_01 Line_01 Line_01 I2 E2 BRK1C Timed Breaker Logic Open@t0 BRK1B Timed Breaker Logic Open@t0 Fig.2. Two-area system model for a transient study. Inrush Study: T3.3 Open the breakers #2 and #3. The transformer is energized on no load by closing the breaker #1. Close breaker 1 at 0.15s and observe the inrush currents. T3.4 Add a 1 Ohm resister in series with the 33 kV winding and observe the results. What effect does the resistance have on the decay of the inrush current? T3.5 Does the breaker closing instant influence the magnitude of inrush? Close the breaker at 0.1535 s and observe the current on phase A. T3.6 Enable the ‘single pole operation’ mode of the breaker. Close the poles at instants when the voltage of the respective phase is at a maximum. Observe results. T3.7 What situation would cause the transformer to saturate on both halves of a voltage cycle? Save the case! The case should be saved as T_03_b.psc before proceeding.

3 / 4 Line Energizing Study: T3.8 Close breaker # 1 and open breaker # 3. Include the multiple run component to control the operation of breaker #2 which is initially open. The closing instant B1 derived from the multiple run. Multiple Run Ch. 1 V1 Meas-Enab . . . E1 B1 0.15 D + F + B2 B1 1 1 overvoltage.out Fig.3. Multiple run component for breaker control. T3.9 The breaker closing instant (B1) should be changed for each run. The breaker is opened 0.15 s after its closing operation. Set the multiple run to switch for 10 sequential points on a 60 Hz waveform. Record the peak voltage E1 at the receiving end. Save the case! The case should be saved as T_03_c.psc before proceeding. Lines on the same right of way: A 130 km transmission line connects the Generating Station C and Station A. This line runs parallel to the 55 km line between Station A and the Wind Farm for 20 km from Station A. The generating voltage is stepped up to the transmission level through an 11/230 kV, Y-Y bank. T3.10 Extend the model to include the 130 km line and the generator as shown in figure 4. The transmission lines are arranged in a sub page as shown in figure 5. Save the case!

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4 / 4 V F Ph BRK2 Timed Breaker Logic Closed@t0 BRK2 E1 I1 BRK3 60.0 3 Phase RMS Three Phase RMS Voltage Meter 230 kV Voltage support Cap. Bank GT230 BRK3 Timed Breaker Logic Closed@t0 Line_01 E2 T lines Line_01 Line_02 Line_03 Line_02 E4 I4 BRK4 Line_03 #1 #2 RL RRL Zpos = 0.01 Ohms at 89 deg. Zzero = 0.011Ohms and 80 deg. 11/230 kV, 500MVA Z=0.08 PU Station C Timed Fault Logic Fig.4. Three area system Line_01 Line_01 Line_02 Line_02 1 Line_03 Line_03 Fig.5. Line arrangement inside the sub-page. T3.11 The voltage behind the equivalent source impedance of the voltage source representing the 4 generators at Station C is 12 kV at 21 degrees. T3.12 Use the Mathcad worksheet to verify results. T3.13 Change the configuration of the 11/230 kV transformer to represent a D-Y unit. Adjust the 11 kV source angle to reflect this change.