In the US, it is not uncommon to see motors up to around 25HP wye connected, and delta connected above that. Line voltage, EL = 6000 V. Active and reactive components of current: Active component = Iph cos = 481 0.8 = 384.8 A. ), Example 6. The configuration closely resembles a letter Y, with the neutral component connected at the middle, which is also where all the lines converge. (2), we obtain the line currents as. Make sure that all connections are tight, and that there are no signs of arching or burn marks on the contactors, burnt marks on the jumper bus-bar or contacts. Inspect the WYE/DELTA contactor buss connections make sure they are making all the terminal leads. This configuration of voltage sources is characterized by a common connection point joining one side of each source. As illustrated in Figure. The six-lead motor is wound in a manner that allows the windings to be connected in a Wye or Delta configuration (see Figure 2). Which arrangement do you choose, and how do you do it? Next, locate #1 and #4. A balanced Y-Y system is a three-phase system with a balanced Y-connected source and a balanced Y-connected load. We look at one phase, say phase a, and analyze the single-phase equivalent circuit in Figure.(4). Phasor diagrams illustrating the relationship between line voltages and phase voltages, For easier understanding, you better read about, Figure 4. Three-Phase Electric Circuits: Balanced Wye-Wye Connection The voltages we get from the three-phase power system are produced by a synchronous generator. where ZY = (5 − j2) + (10 + j8) = 15 + j6 = 16.155 21.8◦. (Ans.) The line-to-line voltages or simply line voltages Vab, Vbc, and Vca are related to the phase voltages. Figure 1. The K5 contactor is connected to the Wye contactor, K4, through a set of jumpers. Hence, EAB = 460 0°, Line current in line A = IAB -ICA, = 10.87(0.8 – j0.6) – 21.74(0.118 + j0.993), = 8.70 – j6.52 – 2.56 – j21.59 = (6.14 – j28.11)A. Power factor, cos = 0.8 (lagging). Example 7. Additionally, the vector phase angles between delta and wye connection is also discussed. Three identical star-connected coils take 8 k W at a power factor 0.8 when connected across a 460 V, 3-phase, 3-wire supply. (Ans. Example 10. It shows the parts of the circuit as streamlined forms, as well as the power as well as signal links between the gadgets. (3a) also shows how to determine Vab from the phase voltages, while Figure. Calculate the line currents in the three-wire Y-Y system of Figure.(5). To prevent burning the motor, make sure to firstly identify if the 9 leads motor is factory pre-configured in the star (wye) or delta configuration before attempting any wiring connection and installing power to run the motor. Depending on the installation voltage, the motor can be wired for either 230V or 400V. Resolving them into their X and Y components, we have, X = 8.06 cos 30° – 20.16 cos 30° = -10.48 A, Y = 10.08 – 8.06 sin 30° – 20.16 sin 30° = – 4.03 A, Line current drawn by the balanced 3-phase, (i) a current of 16.78 A at’O.8 power factor lagging; and, (ii) appropriate lamp current which is in phase with the voltage. 6 Lead, Single Voltage, Wye Start/Delta Run Motors designed by US Motors for Wye Start, Delta Run may also be used for across the line starting using only the Delta connection. While the line current is the current in each line, the phase current is the current in each phase of the source or load. Example 3.In a 3-phase, 3-wire system with star-connected load the impedance of each phase is (3 + j4) Ω. Supply phase sequence is A-B-C. (AMIE Summer, 1997), Solution. Three single-phase transformers with their primaries and secondaries both connected in wye are shown in Figs. (5) is balanced; we may replace it with its single-phase equivalent circuit such as in Figure.(4). Motor Wiring Diagram 12 Lead, Dual Voltage, Wte Start / Delta Run, Both Voltages € € € € € € US ELECTRICAL MOTORS Per NEMA MG1 , "A Wye Start, Delta Run motor is one arranged for starting by connecting to the supply with the primary winding initially connected in wye, then reconnected in delta for running condition.12 Lead Motor … Starting with Wye, the connection consists of a total of five wires: (3) hot, (1) ground and (1) neutral. For the low voltage connection the diagram you posted on iCloud, shows both wye and delta, more specifically double wye or delta. (3b) shows the same for the three-line voltages. It appears that the motor your using is made as a 12 lead delta wound machine. Current in outer (or line) R = IR, Current in outer Y = IY, Current in outer B = IB, Since IR= IY= IB= say, Iph-the phase current, Line current, IL= Iph …(3). For WYE connection, the source neutral is connected to the load neutral. (Figure below) If we draw a circuit showing eac… Per NEMA MG1 1998-1.76, "A Wye … Solution:The three-phase circuit in Figure. The K5 contactor is also connected to the spindle motor leads 4, 5, and 6. This current leads ER by which is the same as lagging behind its phase voltage by . For example, Thus, the magnitude of the line voltages VL is √3 times the magnitude of the phase voltages Vp, or. The neutral current is the vector sum of three lamp currents. (3a) illustrates this. For purposes of making the connection, it doesn’t matter to the installer if the motor is delta-wound or wye-wound. 08-05 … In Fig 9 ER, EY and EB are the phase voltages whereas IR, IY and IB are phase currents. The voltages we get from the three-phase power system are produced by a synchronous generator. If you locate 3 pairs with continuity and one combination of 3, this is a WYE configuration. In many applications the neutral connection … We assume a balanced load so that load impedances are equal. Let us consider R-phase for calculation of power, ER = (133 + j0) ; IR = 26.6 (0.6 – j0.8) = (15.96 – j21.28), PVA = (133 – jO) (15.96 – j21.28) = 2116 – j2830. ), Line current in line C = ICA – IBC, = (- 2.56 – j21.59) – (- 20 – j8.56) = – 2.56 – j21.59 + 20 +8.56 = (17.44 – j13.03)A. (ii) The current in each conductor. 5, The angle between line currents and the corresponding line voltages is (30. ƩX-components = 23 cos 30° – 11.5 cos 30° =11.5 cos 30° = 9.96 A, ƩY-components = 28.75 – 23 sin 30° -11.5 sin 30° = 28.75 – 34.5 sin 30° = 11.5 A. If the line voltage is 230 V, calculate: (i) The line current, and (ii) The power absorbed by each phase. Given: P = 8 kW ; V = 460 volts; cos θ = 0.8. Applying KVL to each phase in Figure. Calculate the in the neutral and draw the vector diagram. Balanced wye-wye connection (i.e., Y-connected source with a Y-connected load). All contents are Copyright © 2020 by Wira Electrical. The delta or wye connection is about the desired motor starting arrangement, not how the motor is wound. A Wye-Delta starter (also known as Start Delta) is one of the most commonly used methods for the starting of a three phase induction motor. (Ans. Find the circuit constants of the load per phase. A balanced 3-phase star connected load of 100 kW takes a leading current of 80 A, when connected across a 3-phase, 1100 V, 50 Hz supply. three-phase circuit in which all the three loads are connected at a single neutral point Calculate: (i) The line current, (ii) Impedance, and. voltage across the phase winding is called the ‘phasevoltage’ (Eph); while the voltage available between any pair of terminals (or outers) is called the ‘line voltage’ (EL). This is the internal WYE connection. All rights reserved. (Ans. A 3-phase, star-connected system with 230 V between each phase and neutral has resistance of 8, 10 and 20 Ω respectively in three phases, calculate: (i) The current flowing in each phase, (ii) The neutral current, and, Phase voltage, Eph = 230 V. ii) The above currents are mutually displaced by 120°. Calculate: (i) The line current (ii) Power factor, and, Solution. A wiring diagram is a simplified conventional photographic depiction of an electrical circuit. In a star-connected load each phase consists of a resistance” of 50 Ω in parallel with a capacitor of capacitance 16 µF. Wye-Wye Connection. Spindle load pegs to 200%: There is an open coil on one of the Wye-Delta contactors. There are four types of balanced three phase voltage: We begin with the Y-Y system because any balanced three-phase system can be reduced to an equivalent Y-Y system. that is, the voltage across the neutral wire is zero. When it is connected to 400 V, 3-phase, 5 Hz supply, calculate: (i) The line current (ii) The power factor, (iii) The power absorbed, and (iv) The total kVA, Capacitance, C = 16 µF = 16 × 10-6 F, lph = Eph.Yph = 231 (0.02 + j0.005) = 4.62 + j1.155 = 4.76 14°, For a star connection, Iph = IL, Hence, line current = 4.76 A. The neutral current IN is the vector sum of these three currents. Car service and repair in Wye, Kent and the surrounding area. It is at this point wherein the voltages are all equal. 3. Initially, we explored the idea of three-phase power systems by connecting three voltage sources together in what is commonly known as the “Y” (or “star”) configuration. The potential difference between outers R any Y is, ERY= ER–EY [vector difference], or ERY= ER+ (-EY) [vector sum], Hence, ERYis found by compounding ERand EYreversed and its value is given by the diagonal of the parallelogram (Fig.6). In a balanced condition, the three voltages have equal amplitudes. BUT refer to the manufactures specification because some 3 phase motors MUST be connected in Star or Wye because if you note in Wye there are 2 motor windings in series between each line. WYE connection- Voltage. ), (ii) Power factor = cos 14° = 0.97 (leading). Low Starting Torque: The star-delta (wye-delta) starting method controls whether the lead connections from the motor are configured in a star or delta electrical connection. They have been delta 440 and wye 220. (Ans. •In this method of inter-connection the similar ends either the ‘start’ or ‘finish’ are joined together at point N. This common point N [Fig. The wye-wound has higher resistance and higher inductance, better for drives with lower switching frequencies. On machines rated for two voltages, the wye connection is for the high voltage; the delta connection is for the low voltage. ), (iv) Total volt-amperes = 3 × 1100 = 3300 VA = 3.3 kVA. Once the motor has reached approximately 80% speed the motor is then connected … (iii) Resistance and inductance of each coil. A motor can be connected either way using these links as shown below. Delta connection winding can be done in a smaller diameter than those of a Wye. 5 (a)] is called star point or neutral point Ordinarily only three wires are carried to the external circuit giving 3-phase, 3-wire start connected system but sometimes a fourth-wire, known as neutral wire is carried to the neutral point of the external load circuit giving 3-phase, 4 wire star connected systems. Solution. The wye-connected secondary allows single-phase load to be distributed among the three phases to neutral instead of being placed all on one winding as with a four-wire delta secondary. Figure. (1), ZS denotes the internal impedance of the phase winding of the generator; Zl is the impedance of the line joining a phase of the source with a phase of the load; ZL is the impedance of each phase of the load, and Zn is the impedance of the neutral line. Inspect the Wye-Delta assembly. The phase loads (such as motor windings) are connected to each other in the shape of a triangle, where the connection is made from one end of winding to the starting end of the other, forming a closed circuit. The first type is balanced wye-wye connection. Also, the line voltages lead their corresponding phase voltages by 30◦. Just the voltage numbers. Actual component of load current = 16.78 × 0.8 = 13.42 A Reactive component = 16.78 × 0.6 = 10.07 A, Copyright © 2012-19 Electrical-engineering-assignment.com All Rights Reserved | FAQ | Privacy Policy | Terms & Conditions | Electrical Engineering Homework Help. power factors of 0.8 and 0.6 respectively, while the third phase is open-circuited. Power systems designed in this way are well grounded at all critical points to ensure safety. (Ans.). These two connections produce very different results when power is applied. Required fields are marked *, You may use these HTML tags and attributes: ** **

, 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. 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