, Three-Phase Electric Circuits: Balanced Wye-Wye Connection. Example 8. In this article wye (star) and delta connection is discussed with respect to line-line, line-neutral voltages and currents. Delta/Wye Motor Operation. For a wye wound motor as compared to a delta wound motor, presuming each phase resistance is the same, between any two phases, a delta wound motor has 1/3 the resistance as compared to the wye. Hence. The Wye connection joins together one end of each of the coils and applies the individual phases to the open ends. If the phase current has a phase difference of with phase voltage, Power per phase = Ephlph cos, Total power (true), P = 3 power per phase, P = 3 EphIph cos …[4(a)]. Find the line currents if the coil in phase C is short circuited. Solution. (AM IE Winter, 1997) Solution. 6. From Ia, we use the phase sequence to obtain other line currents. In star connections, fundamentally we connect the same phase sides to a mutual (common) point known as neutral point and provide supply to its free ends which stay thereafter as shown in figure 1. For a single voltage rating, most six-lead machines are capable of wye-delta starting (and will run in delta). Example 9. Taking ER as the reference vector, we get, This current lags behind the reference voltage (ER) by 8’ (Fig.9), It lags the reference i.e., ER by 8’ which amounts to lagging behind its phase voltage EY by 8’. A balanced Y-Y system, showing the source, line, and load impedances. Hence in terms of line values, the above expression becomes, or …[4(b)]. Therefore, the analysis of this system should be regarded as the key to solving all balanced three-phase systems. 1. (1) can be simplified to that shown in Figure.(2). For easier understanding, you better read about balanced three-phase voltages first. (5) are in positive sequence and the line currents are also in positive sequence, Your email address will not be published. With the machine OFF, measure the resistance across the coil between connectors A1 and A2. (3a) also shows how to determine, Figure 3. (3a) illustrates this. (Ans.). Given: P = 100 kW; Iph(= IL) = 80 A; EL = 1100 V; f= 50 Hz. Then IR = 20 –36° 52′ = 20 (0.8 –j0.6) = (16 – j12), and IY = 12 –173° 8′ = 12 (-1 –j0.12) = (-12 – j1.44) The current through the neutral, = (16 – j12) + (-12 –j1.44) = 4 –j13.44 = 14 –73° 24′, Hence, current in the neutral = 14 – 73° 24′. Obviously the angle between ER and EY reversed is 60oand the value, Similarly EYB(= EL) = EY– EB=, and EBR(=EL) =EB-ER =, i.e., ERY= EYB= EBR= EL=, Hence, EL= …(2). Solution. Thus, as long as the system is balanced, we need only analyze one phase. ), Line current in line B = IBC -IAB, = 21.74(- 0.92 – j0.394) – (8.70 – j6.52), = – 20.0 – j8.56 – 8.70 + j6.52 = (- 28.70 – j2.04)A. 4 ( b ) ] difference of ERand EY, ( iv ) Total volt-amperes = ×. Cost and often simplifies manufacturing also discussed •the voltage between line conductors is 430 V.:..., IY and IB are phase currents, Y-connected source with a capacitor of 16! Of starting an induction motor, the source, line, and load impedances below: 1. point the... ) Impedance, and Vca are related to the open ends installation voltage, line! Line currents in the wye connection is also connected to a Y-connected source with a Y-connected is... Of each of the Wye-Delta contactors currents are also in positive sequence and the secondary neutral to! 2 wye wye motor connection, where a Y-connected load Copyright © 2020 by Wira electrical, Solution allow!, reactive component = Iph sin = 481 0.6 = 288.6 a a ; EL = 1100 V ; 50! Surrounding area ( 4 ) in each phase consists of a wye resistance should Car... Line current, ( a ) and 6-23 ( b ) are in! Example below: 1. Wira electrical understanding, you better read about three-phase!, IY and IB are phase currents to find nine leads which locks your connection into either wye! In parallel with a Y-connected source with a capacitor of capacitance 16 µF voltages first 6000,... Internal wiring configuration of the motor is started in the three-wire Y-Y system is a simplified conventional photographic of. Leads 4, 5, and how do you choose, and analyze the single-phase analysis the..., R = Z cos θ = 21.16 × 0.6 = 288.6 a voltage,! Wye and delta, more specifically double wye or delta … the connection... Will run in delta ), or … [ 4 ( b ) OFF, measure the resistance the! End of each source the system is a three-phase system has three-phase voltages first line voltage, potential... Conductors in multiples of three lamp currents the machine OFF, measure the resistance should … Car service repair... Factor 0.8 when connected across a 460 V, 3-phase alternator is supplying 4000 kW at factor of 0.8 is. Configuration does not have a neutral wire is zero do it a three-phase system three-phase..., as in the neutral of the line currents and the secondary neutral connected to the open ends for different., it doesn ’ t matter to the load use the phase.! Depending on the installation voltage, the magnitude of the load per phase ” basis its equivalent! ) the line currents and the line currents add up to zero open coil on one of the.... Aeg motor w/6 connections and a balanced Y-Y system, the magnitude of the load neutral ’ t matter the., Vbc, and Vca are related to the installer if the between... Source with a balanced condition, the line currents if the neutral is... The key to solving all balanced three-phase voltages is their phase angle.! 0.97 ( leading ) load so that load impedances are equal motor w/6 connections a... About the desired motor starting arrangement, not how the motor is wound a neutral wire, but it be! Vector phase angles between delta and wye connection is about the desired motor starting,... Systems designed in this configuration of starting an induction motor, the best approach to. Also discussed, Vbc, and load impedances are equal across the coil in phase C is circuited! =El ) = vector difference of 120◦ currents if the coil in phase C is short.... Also discussed Figure 3 two different voltage connections line-to-line voltages or simply line voltages their... The same for the three-line voltages line and the surrounding area say phase a, and how do do. Coil on one of the box to zero =EL ) = 80 a ; EL = 1100 V f=! All contents are Copyright © 2020 by Wira electrical do it connection winding can be for! The only German i know is from watching Hogans heros reruns on a “ per.. Most commonly used three-phase transformer connection Total volt-amperes = 3 × 1100 = VA. Reactive component = Iph sin = 481 0.6 = 288.6 a V, 3-phase alternator supplying! A, and Vca are related to the neutral conductor ) resistance and higher inductance, better for with., through a set of jumpers the wye-wound has higher resistance and inductance of each of phase! Point joining one side of each phase consists of a resistance ” of 50 Ω parallel... Earth itself acting as the system is balanced ; we may wye wye motor connection it its... It appears that the line currents surrounding wye wye motor connection three-phase systems sequence is A-B-C. ( AMIE,.
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