Answer: Applying the three-phase formula for voltage drop, where: K = 21.2 ohms-cmil/ft for aluminum; I = 100 amps; D = 80 ft; cmil = 83,690 cmil. (The “480” designates 11.3 Analysis of the Y-Y Circuit. The power delivered by a three-phase circuit pulsates also, but it never falls to zero, Figure 12-2. Real Power. Average Value of the output voltage may be got by averaging over a single In a three-phase system, the power delivered to the load is the same at any instant. •The angle between V & I is the angle on the impedance. So, VD = 1.732 x 21.2 x 100 x 80/83,690 = 3.51 Voltage Drop Example 3 — Find the size of copper wire needed in a single-phase application to carry a 1 Chapter 11 Balanced Three-Phase Circuits 11.1-2 Three-Phase Systems. Line to line voltage: W applied = 3 1/2 U ll I cos Φ = 3 1/2 U ll I PF (1) where. The Three-Phase Voltage System Three-phase voltage systems are composed of three sinusoidal voltages of equal magnitude, equal frequency and separated by 120 degrees. POWER IN BALANCED THREE-PHASE LOADS •The voltage across is line voltage •The current is phase current. W applied = real power (W, watts) Single- phase loads are connected to one leg of the wye between line and neutral. This means that three-phase power … Three-phase ac power has a number of advantages over other means of power distribution. The three phase circuits would be used to power motors whereas the single phase branches of the three phase service would typically be used for lighting, heating and fractional horsepower motors. 11.5 Power Calculations in Balanced The Wye configuration is used to distribute power to everyday single-phase appliances found in the home and office. A common electrical service to commercial and industrial users would be 480-3-60. A 500-kVA, 3-phase, 50 Hz transformer has a voltage ratio (line voltages) of 33/11 kV and is delta/star connected. Outline Power Generation Fundamental Concepts (recap) 1-Phase: V, I, S,P, Q, PF Balanced 3-phase Line-line vs. line- neutral voltage 11.4 Analysis of the Y- Circuit. 3. Most AC power today is produced and distributed as three-phase power where three sinusoidal voltages are generated out of phase with each other. Analysis of 3 phase rectifier with resistive load: Notation: Let V m = Peak line to neutral voltage Useful Integration formula: 4 3 6 6 cos ( ) 6 ∫ 2 = + − π ω ω π π td t 1. With single-phase AC power there is only one single sinusoidal voltage. The power falls to zero three times during each cycle. Peak Output Voltage = peak of the line of line voltage = 3×Vm 2. Go back to Three phase power measurements ↑ Wye and Delta comparison. The main advantage is that, since the phase currents of three-phase power cancel each other out, it is possible to reduce the size of the neutral wire or to eliminate it altogether. 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