EE
Experiment 7 (1).pdf

# Experiment 7 (1).pdf - Middle East Technical University NCC...

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Middle East Technical University - NCC EEE202 - Circuits Theory II Laboratory 1 EXPERIMENT 7 THREE PHASE CIRCUITS Objective To study three phase circuit, understand Y and connection schemes, experience relation between phase and line-to-line quantities. Preliminary Work 1. Three phase Y-Y connected circuit is given with sources of 200Vrms per phase, and parallel connected RL load. Resistance value of the load is 1.7kΩ and inductor value is 10.3H. Examine the circuit and find following values: a. Per phase load impedance in phasor form b. Line-to-line voltage of source c. Phase and line-to-line voltage of load d. Phase current of source e. Phase current of load f. Apparent and reactive power dissipation of each load phase g. Total power dissipation

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Middle East Technical University - NCC EEE202 - Circuits Theory II Laboratory 2 2. Three phase Y- connected circuit, RMS value per phase of Y connected AC source is 87V. In the load side, a capacitor of 0.87μF is connected series with 616Ω resistance in each phase. Examine the circuit and find following values: a. Line-to-line voltage of source b. Phase and line-to-line voltage of load c. Phase current of source d. Phase current of load e. Apparent and reactive power dissipation of each load phase f. Total power dissipation Simulate the circuit using PSpice, and provide following plots: (A basic guide to three phase simulation on PSpice is given in following pages.) g. Phase current of load and source (on same graph). Indicate which one is greater and explain why. h. Phase voltage of load and source (on same graph). Find phase difference between them, and comment on it. i. Phase current and voltage of load (on same graph). Find phase difference through the graph and compare it with analytical calculations.
Middle East Technical University - NCC EEE202 - Circuits Theory II Laboratory 3 How to simulate three phase circuits: To simulate three phase circuits, you should construct a circuit as it should be and adjust phases of three sources 120˚ distant from each other. A simple Y-Y circuit with only resistive load and no neutral cable is constructed in the circuit diagram below.

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