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I found something similiar in NFPA 70e under appendix D for an example calculation but that is just an example and not a requirement. I would expect the high leg fed by two transformers to have the highest current. The angle Ф between line currents and respective line voltages is (30°+Ф), i.e. in Delta connection, the Line Voltage is equal to the Phase Voltage. I have applied for electrical supervisor license exam can I get the question papers related to this exam so that I can prepare accordingly. Pump Head Calculations Within a pipe system there is often a pump which adds additional pressure (known as 'pump head') to overcome friction losses and other resistances. The major difference is that unlike balanced systems (ungrounded deltas or grounded wye's), you will have zero sequence current flowing even under normal conditions. IEEE 1584 can't directly be used because of course what you are proposing is not balanced in the slightest. Earlier revert will be great for me. For example, if you make $10,000 a year and donate $500 to charity, the relative Open Delta Transformer Calculations Let us start with the relevant equations: Capacity of open delta system = x rating of one transformer = x 10 kVA= 17.32 kVA. In transformer primary is delta connection and secondary is star connection , the primary v1=110kv ,v2=22kv and power is 16 mva how to calculate current i1 and i2, If im using the formual p= 3*vph*iph*cos fi what is the value of cos fi. Your email address will not be published. Consider the low-voltage side of a 120/240 V high leg delta connected transformer, where the 'b' phase is the 'high' leg. Phase winding C = (12 kVA of C1 x 2) = 24 kVA. 360°/3 = 120°. Explanation: 'High leg' refers to one phase of a three-phase delta configuration in which a center tap (and not the same kind of 'center tap' in the asker's text) is connected to ground. Transformer impedance and KVA and voltage of the secondary determines this...unless the high leg delta affects the calculation differently (not sure on this one...). 9.127 Required fields are marked *, All about Electrical & Electronics Engineering & Technology. Your email address will not be published. High-leg delta (also called “red-leg” or “wild-leg” delta) configuration are commonly used in older three-phase electric power installations in which it supplies both line-to-line and line-to-neutral services in the same distibution system. Just to cover the issue, high leg delta is common in rural areas because it requires only one transformer and 4 wires to the building. 1. Sorry. Since the phase sequence is R → Y → B, therefore, the direction of voltage from R phase towards Y phase is positive (+), and the voltage of R phase is leading by 120°from Y phase voltage. This makes sense of his reference to a 208V 'high or stinger leg' on a 240V, 3http: Or the starting end of the first coil is connected to the finishing end of the second coil and so on (for all three coils) and it looks like a closed mesh or circuit as shown in fig (1). each Line current is lagging by (30°+Ф) from the corresponding line voltage. Consider the illustration, showing the output from both a close delta and open delta transformer. We showed up, the journeyman I'm working with took a few minutes to look around, and then called me over to the panel to show me. Anyone else know how to calculate this? Phasor diagram showing 240 V delta and center-tapped phase (a-c) creating 120 V voltages. Table of Contents What is Delta Connection  (Δ)?Voltage, Current and Power Values in Delta Connection (Δ)Line Voltages (VL) and Phase Voltages (VPh) in Delta ConnectionLine Currents (IL) and Phase Currents (IPh) in Delta ConnectionPower in Delta Connection. Limited Edition... Book Now Here. A mixture of high anion gap metabolic acidosis plus chronic respiratory alkalosis plus hyperchloremia acidosis. Line 3 and Line 1 = VBR. High leg delta connection transformer The voltage between the phases, V AB =V BC = V CA The phase to neutral voltage can be calculated using the following formula: Related Post: Star and Delta Connected Lighting Loads, Total Power = P = 3 x VPH x IPH x CosФ ….. (1). 3 Phase Power, Voltage & Current Values in Delta Connection (Δ). As, all the Line current are equal in magnitude i.e. What happens when one of the phases of delta gets revese. A relative delta compares the difference between two numbers, A and B, as a percentage of one of the numbers. In Delta Connection, The Line current is √3 times of Phase Current. So this question is starting to come a little closer to home. there is one phase winding between two wires). In an open delta with single-phase loads, the high leg must be identified by: Your Answer: using orange tape Help: NEC Section 110.15 This was marked incorrect, but I do not understand how this is wrong after reviewing Dear Admin, I need help from you & I know you will able to help me. I'll be nice to see the quoted text as well. If the line voltage between; Line 1 and Line 2 = VRY. But you can at least get conservative results by looking at the worst case fault current. Please help calculate the pahse voltage across three delta connected resistors when the line voltage is 250 v – please show me the working out? Just a thought. ; The current of Line 1 can be found by determining the vector difference between IR and IB and we can do that by increasing the IB Vector in reverse, so that, IR and IB makes a parallelogram. Similarly, we can find the reaming two Line currents as same as above. The NEC allowed this until 1978 for a new install. © 2019 Arcflash Forum / Brainfiller, Inc. | P.O. The three phase is exactly the same as any other three phase except for the location of the The performance of a pump is usually available from the manufacturer, in terms of the pump performance curve, which plots a graph of the flow versus head produced by the pump for a range of flow values. An unbalanced star-connected load has branch impedances of Z R = 10 30 Ω, Z Y = 20 45 Ω and Z B = 20 60 Ω and is connected across a … Get Free Android App | Download Electrical Technology App Now! Therefore, in Delta Connection, the voltage between (any pair of) two lines is equal to the phase voltage of the phase winding which is connected between two lines. With a little complex mathematics one can derive the fault current. Board index » Arc Flash Studies » System Modeling and Calculations. Sidebar: High Leg The terms “high-leg,” “wild-leg,” or “stinger-leg” identify the conductor (of a delta-connected system) that has a voltage of 208V to ground. there is one phase winding between two wires). We know that the values of Phase Current and Phase Voltage in Delta Connection; P = 3 x VL x ( IL/√3) x CosФ …… (IPH = IL / /√3), P = √3 x√3 x VL x ( IL/√3) x CosФ …{ 3 = √3x√3 }. Delta "high-leg" source 240 V ∠ 0o 240 V ∠ 120 o 240 V ∠ 240 o N (neutral) Identify the different voltages obtained from this coil configuration, and which connection points each voltage is measured between. i have a building with 600 amps service 3 phase delta,, phase A has 120 v, phase B has 240 v,phase C has 120 v the neutral from the greed is only attached to the metal box where the main fuse box is , is a domestic and commercial building is this correct? Sequence networks assume that you can separate the system into three networks, two balanced and one unbalanced. If, = 2 x IPH x (√3/2) …… Since Cos 30° = √3/2. 10 and 12 Lead High-Wye Available Voltages 10 lead generators are identical to 12 lead generators with the exception that T10, T11, and T12 are permanently bonded together as T10 or T0 480V Connections shown in Blue 416V By convention, 208V 3-phase is often used in "Wye" mode because one leg of the wye is good old familiar 120V. In Delta connection, the three windings interconnection looks like a short circuit, but this is not true, if the system is balanced, then the value of the algebraic sum of all voltages around the mesh is zero in Delta connection. Please consider supporting us by disabling your ad blocker. In our patient, the delta delta was (30 - expected AG of 10) / (24 - HCO3 of 21) = 20/3 = 6.7. Any more advice on how to calculate fault currents on these unbalanced sources? Find latest trends high cut one piece swimwear up to 70% off & Get Free shipping! I.e. Box 12024 | Scottsdale, AZ 85267 USA | 800-874-8883, It is currently Thu Dec 10, 2020 11:32 am. Therefore, It will be noted from the below (fig-2) that the, Fig (2). Then, we see that VRY leads VYB by 120° and VYB leads VBR by 120°. Okay...I am a bit confused. For a ratio > 2, this indicates a concurrent metabolic alkalosis, likely due to … waross, it may be that the OP is talking about a 240V split phase delta (high leg, wild leg, or red leg delta), as shown on the last page of this link. The diagonal of that parallelogram shows the vector difference of IR and IB which is equal to current in Line 1= I1. Line & Phase Current and Line & Phase Voltage in Delta (Δ) Connection, The current of Line 1 can be found by determining the vector difference between I, The Line Currents are 120° apart from each other, Line currents are lagging by 30° from their corresponding Phase Currents. A three phase balanced load is a system in which the load connected across three phases are identical. Why are delta preferred for motors/pumps? 3 phase delta power Most utility companies will not hook up 3 phase delta on the customer side anymore because the the “high” or “wild” leg, which as shown in the diagram runs a … In both Star and Delta Connections, The total power on balanced load is same. Since you don't even have balanced transformers it is sounding more and more like you'd have to simply treat this as 3 single phase systems and take the worst case out of all 3. I came across my first high leg delta last week. To me the numbers do not add up. I was overlooking a study at a facilty that paid for a full-blown arc flash analysis. High Leg Open Delta Calculation Power Generation 3 Mar 10, 2015 B Re: High Leg on 3 Phase Power General Automation Chat 0 Jan 14, 2015 M High Leg on 3 Phase Power General Automation Chat 2 Jan 13, 2015 J 0 Feb 8 Step by Step Procedure with Solved Example, Electrical Wire & Cable Size Calculator (Copper & Aluminum), Coulomb’s Laws of Magnetic Force – Formula & Solved Example. Thanks. Scroll to the bottom to watch the YouTube tutorial video on three phase voltage + calculations So in our last three phase tutorial we looked at the basics of whats happening inside three phase electricity systems and in this tutorial we’re going step it up just a notch and look a little deeper into how these systems work and the basic maths behind them. The positive and negative sequence networks are identical. Now we will find the values of Line current, Line Voltage, Phase Current, Phase Voltages and Power in three phase Delta AC system. For example, a … Line 2 and Line 3 = VYB. Many of these delta connections serve combined single and three phase loads, and are made up of single phase units. 1. The high-leg voltage is the vector sum of the voltage of transformers A and It is seen in fig 2 that there is only one phase winding between two terminals (i.e. 360°/3 = 120°, All three phase Currents are equal in magnitude, All phase Currents are in phase by each other i.e. I.e. It's the phase 'opposite' the center tap, and thus has This setup is done via two perfect transformers with one transformer representing the primary, two representing the secondary. All three phase voltages are equal in magnitude, All phase voltages are in phase by each other i.e. Delta or Mesh Connection (Δ) System is also known as Three Phase Three Wire System (3-Phase 3 Wire) and it is the most preferred system for AC power transmission while for distribution, Star connection is generally used. Then, we see that VRY leads VYB by 120° and VYB leads VBR by 120°. The same is explained in 3-Phase Circuit MCQs with explanatory Answer (MCQs No.1). It appears that the company may have used EasyPower software to perform the analysis. The voltage measured from this center tapped neutral to the third “wild” leg is 208 Vac.This service almost always has a neutral connection, but in some rare situations, the neutral conductor is not available. Good point but isn't the account calculation part pretty straightforward? VRY = VYB = VBR = VL   …………… (Line Voltage). Contrast Color Edge High Leg … To find the fault current for high-leg delta, one must consider the unbalance to ground via the ground connection, and one must consider the unbalance to ground due to the fault. This diagram shows a 3 phase delta breaker in a single phase breaker box. Good to Remember: In Delta configuration, at any instant, the EMF value of one phase is equal to the resultant of the other two phases EMF values but in the opposite direction. This configuration gets its name because in an electrical drawing it looks like a triangle (Greek symbol Δ for the letter “delta”). A Delta Delta Gradient significantly less than 0 may result from: A mixed high anion gap metabolic acidosis plus a normal anion gap metabolic acidosis. This is the most common four-wire three-phase delta service and is essentially a 240 volt, three-phase, three-wire delta service with one of the 240 volt transformer winding center tapped to provide two 120 Vac circuits, which are 180 degrees out of phase with each other. High leg systems just change the modelling of the third ("0") network. total power in a Three Phase System = P = √3 x VL x IL x CosФ. Moreover, by reversing the vector of IB, it may indicate as (-IB), therefore, the angle between IR and -IB (IB, when reversed = -IB) is 60°. Exactly what I was thinking...I cannot obtain a value of 74 cal unless I make the c/b trip time ridiculously high. Delta Connection (Δ): 3 Phase Power, Voltage & Current Values, Three Phase Delta Connection: Line, Phase Current, Voltages & Power in Δ Configuration, In more clear words, all three coils are connected in series to form a close mesh or, Fig (1). When a terminal is open in Δ, then there is no chance of flowing currents with basic frequency around the closed mesh. In more clear words, all three coils are connected in series to form a close mesh or circuit. It will be noted from the below (fig-2) that the total current of each Line is equal to the vector difference between two phase currents in Delta connection flowing through that line. Now that you understand some transformer calculation basics and specifics on delta transformer calculations, you will be able to size delta transformers correctly. The thing with high-leg delta is it's a compromise to also yield common household 120V single-phase in a way which is not unsafe. Likewise, the voltage of Y phase is leading by 120° from the phase voltage of B and its direction is positive from Y towards B. Or one will be left out altogether for an open wye-open delta connection. While you can think of the transformer in this manner, it is more fruitful not to consider comparisons but to the necessary calculations on the open delta transformer. It is used when both single and three-phase power is desired to be supplied from a three phase transformer (or transformer bank). Likewise, the voltage of Y phase is leading by 120° from the phase voltage of B and its direction is positive from Y towards B. How to Calculate/Find the Rating of Transformer in kVA (Single Phase and Three Phase)? Do you know which section of IEEE that states that? In calculating short circuit current with a Delta high-leg system, the following data was provided: 300 KVA transformer with 6.37% impedence and an X/R ratio of 3, 480 v primary/ 240 v secondary 3-phase delta high leg. Just grind through the formulas (multiplying by "a") to calculate Z0 based on your starting formulas. 16mva is not ‘P’ that is ‘S’ so you can use the formula s=root3*v*i to find the currents. 25% Off on Electrical Engineering Shirts. What about analysis of corner grounded 3 phase delta? It is seen in fig 2 that there is only one phase winding between two terminals (i.e. I may have to send this question to EasyPower to find my answer...just curious if you might know. Do they take into acccount the dynamics involved in high-leg faults? In calculating short circuit current with a Delta high-leg system, the following data was provided: A three phase to ground fault will be unbalanced so you won't have a single short circuit current. How to Calculate the Battery Charging Time & Battery Charging Current – Example, How to Find The Suitable Size of Cable & Wire for Electrical Wiring Installation? We depends on ad revenue to keep creating quality content for you to learn and enjoy for free. Step by Step Procedure with Calculation & Diagrams. The line-to-line voltage magnitudes are all the same: V a b = V b c = V c a = 240 V . what will be the resultant voltage? Not really sure why this company gave the results that they did. STAR-DELTA CONVERSION Example 53. High-leg delta (also known as wild-leg, stinger leg, bastard leg, high-leg, orange-leg, or red-leg delta) is a type of electrical service connection for three-phase electric power installations. For discussion, if you ignore the 120V single phase connections, you can usually treat the 240V high leg as a standard delta. Every modeling package out there has its quirks and it is best to know what those are. So, Paul, can programs like EasyPower be trusted in these scenarios? Three wires are taken out from three junctions and the all outgoing currents from junction assumed to be positive. Up tp 93% Off - Launching Official Electrical Technology Store - Shop Now! The basic formula is A - B/A x100. Cheers. My books show equivalent sequence networks for lots of possible faults, but the three phase to mid-winding fault is not covered. i.e., I2 = IY – IR … Vector Difference = √3 IPH, I3 = IB – IY … Vector difference = √3 IPH. i.e. Phase winding A = 22 kVA. We got a service call about some lights that weren't working correctly. High leg delta connection is a configuration with one of the secondary windings of the transformer is center tapped and grounded. Can someone confirm to me the following: The original company may have looked at several scenarios (back-up generator, increased utility contribution, decreased utility contribution, motors on/off, etc.) – Examples in British and SI System, Thevenin’s Theorem. i.e. in their evaluation and only posted the results for the worst case. Many call it a high-leg system because the voltage from Line 2 to ground is higher than that of the other legs. Our website is made possible by displaying online advertisements to our visitors. Where Cos Φ = Power factor = the phase angle between Phase Voltage and Phase Current (not between Line current and line voltage). I am not 100% sure of what Easypower would and would not handle because I'm not familiar with it. Phase winding B = 22 kVA. I finally got the data from the breaker, and on the trip curve, this breaker should go at about 0.033 seconds...which yields a very low calorie level...which is what I would expect with such a low short circuit current. In Delta (also denoted by Δ) system of interconnection, the starting ends of the three phases or coils are connected to the finishing ends of the coil. The tapped "lighter" will be of a larger kVA size, while the two connected to the wild leg will be smaller. Leg of the phases of delta gets revese your ad blocker company the... Three wires are taken out from three junctions and the all outgoing currents from assumed... In NFPA 70e under appendix D for an example and not a.. Current is √3 times of phase current derive the fault current what I was thinking... can... To Calculate/Find the Rating of transformer in kVA ( single phase and three phase ), i.e of... Relative delta compares the difference between two wires ) Copyright 2020, all three phase currents in! In fig 2 that there is one phase winding between two numbers, a Complete Guide Solar. These unbalanced sources ) network via two perfect transformers with one transformer representing secondary! Cos 30° = √3/2 No.1 ) networks for lots of possible faults, but the three phase currents are in! The Wye is good old familiar 120V... just curious if you might know to the! It will be left out altogether for an example calculation but that is just example! A = 240 V about Electrical & Electronics Engineering & Technology three coils are connected series! Just grind through the formulas ( multiplying by `` a '' ) network can I get the question related. Pretty straightforward Wye is good old familiar 120V mixture of high anion gap metabolic acidosis plus chronic respiratory alkalosis hyperchloremia. And one unbalanced is often used in `` Wye '' mode because one leg of the legs! And only posted the results that they did both Star and delta connections serve combined single three-phase... Package out there has its quirks and it is best to know what those are because the voltage from 2! The slightest an example and not a requirement ground is higher than that of the of. High-Leg system because the voltage from Line 2 to ground is higher that... 1= I1 trends high cut one piece swimwear up to 70 % off - Launching Official Technology... Than that of the phases of delta gets revese 24 kVA because the voltage from Line 2 = VRY learn. Of single phase and three phase currents are in phase by each other.! I can prepare accordingly off & get Free shipping able to help me power in a three voltages! Studies » system Modeling and calculations not covered high cut one piece at... C = ( 12 kVA of C1 x 2 ) delta gets revese so, Paul, programs... ( 30°+Ф ) from the below ( fig-2 ) that the company may have used EasyPower software to the... Not 100 % sure of what EasyPower would and would not handle because I 'm not with! Guide about Solar Panel Installation *, all the same is explained in 3-phase circuit with... Calculate Z0 based on your starting formulas `` lighter '' will be smaller at bikinishe.com might know analysis... Frequency around the closed mesh the diagonal of that parallelogram shows the vector difference of IR IB. The Rating of transformer in kVA ( single phase connections, the Line voltage equal... Delta transformers correctly the modelling of the phases of delta gets revese the three phase loads, are. Consider supporting us by disabling your ad blocker index » Arc Flash analysis currents and respective voltages... Wild leg will be of a larger kVA size, while the two connected to the voltage... 3-Phase circuit MCQs with explanatory answer ( MCQs No.1 ) third ( `` ''... Therefore, it will be able to help me or one will be out... Supervisor license exam can I get the question papers related to this exam so that I not... Am not 100 % sure of what EasyPower would and would not handle because I 'm not familiar it! 208V 3-phase is often used in `` Wye '' mode because one leg of the is! Same as above on delta transformer calculations, you can separate the system into three networks, two balanced one! On how to calculate Z0 based on your starting formulas I was thinking I. You will able to size delta transformers correctly magnitudes are all the:! Similiar in NFPA 70e under appendix D for an example calculation but that is just an example and not requirement! The illustration, showing the output from both a close mesh or circuit are... Arcflash Forum / Brainfiller, Inc. | P.O are all the same: V a b V. Cal unless I make the c/b trip time ridiculously high – Examples in British and system... Has its quirks and it is best to know what those are single! Question papers related to this exam so that I can not obtain a value of 74 cal unless make! In both Star and delta connections, the total power on balanced load same! Transformer bank ) derive the fault current, voltage & current Values in delta connection ( Δ ) on revenue. Is explained in 3-phase circuit MCQs with explanatory answer ( MCQs No.1 ) has its quirks and it seen., Paul, can programs like EasyPower be trusted in these scenarios ad blocker know section... Grounded 3 phase power, voltage & current Values in delta connection, the Line current are in. That states that leg will be of a larger kVA size, while two! Time ridiculously high the below ( fig-2 ) that the company may have send... In high-leg faults trusted in these scenarios leg systems just change the modelling of the phases of delta gets.... In fig 2 that there is no chance of flowing currents with basic frequency around the closed.. Transformer representing the primary, two balanced and one unbalanced ( fig-2 ) that the, fig 2... & get Free Android App | Download Electrical Technology Store - shop Now up... Tp 93 % off - Launching Official Electrical Technology App Now ignore the 120V phase... Were high leg delta calculations working correctly ( or transformer bank ) App Now software to perform the analysis on your starting.. Star delta 3-phase Motor Automatic starter with Timer, a and b, as a percentage of one of third... Transformer representing the secondary required fields are marked *, all three coils are connected in to! Examples in British and SI system, Thevenin ’ s Theorem call it a high-leg system because the from! Then there is one phase winding between two wires ) is currently Thu Dec 10, 2020 11:32 am Complete. Shop Now modelling of the third ( `` 0 '' ) to calculate fault on! We see that VRY leads VYB by 120° three coils are connected in series to a! Shop online for high leg systems just change the modelling of the phases of gets! Vyb leads VBR by 120° and VYB leads VBR by 120° and VYB leads VBR by 120° phase voltages in... Wye is good old familiar 120V can at least get conservative results by looking at the case! Connections, you will be smaller one unbalanced two wires ) example and not a requirement trusted these! I can prepare accordingly 85267 USA | 800-874-8883, it is used when both single and three phase ) V. You will able to help me supplied from a three phase transformer ( or transformer bank ),. Thu Dec 10, 2020 11:32 am two terminals ( i.e a value of 74 cal unless I the! Looking at the worst case Electrical supervisor license exam can I get the question papers to! Not really sure why this company gave the results for the worst case current... Looking at the worst case has its quirks and it is seen in 2. In more clear words, all phase voltages are equal in magnitude i.e I was thinking... I can accordingly. Piece swimwear up to 70 % off & get Free Android App | Download Electrical Technology Now. That there is no chance of flowing currents with basic frequency around closed! The tapped `` lighter '' will be smaller least get conservative results looking... I make the c/b trip time ridiculously high chance of flowing currents with basic around! Looking at the worst case fault current © 2019 Arcflash Forum / Brainfiller, Inc. | P.O course! Into acccount the dynamics involved in high-leg faults taken out from three junctions the... Anion gap metabolic acidosis plus chronic respiratory alkalosis plus hyperchloremia acidosis, 208V 3-phase is often used in Wye. `` Wye '' mode because one leg of the other legs I am not 100 % sure of EasyPower! Admin, I need help from you & I know you will noted. 'Ll be nice to see the quoted text as well transformer calculations, you can separate the system three. Delta connection, 2020 11:32 am combined single and three-phase power is desired to be positive ) …… Cos. Of what EasyPower would and would not handle because I 'm not familiar with it high leg delta calculations.. 1584 ca n't directly be used because of course what you are proposing is not covered in fig 2 there. 3-Phase circuit MCQs with explanatory answer ( MCQs No.1 ) call it a system! Load connected across three phases are identical 208V 3-phase is often used in `` Wye '' mode because one of. Out there has its quirks and it is best to know what those are the below ( fig-2 that. By looking at the worst case the question papers related to this so... This until 1978 for a new install as same as above have the current... For you to learn and enjoy for Free the angle Ф between currents. For discussion, if you might know point but is n't the account part. Output from both a close mesh or circuit IR and IB which is to. Calculate/Find the Rating of transformer in kVA ( single phase connections, you be...
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