# Questions tagged [delta]

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### Delta to delta or delta to wye transformer

I am going to feed 240Vac 1-phase into a rotary phase converter the resulting 240 3-phase needs to power two robot controllers, but the controllers require 200-230Vac 3-phase or 400 - 480Vac 3 phase. ...
342 views

### Delta star, beginner question

Hi, can someone tall me why the line comes from behind the motor and comes back in front of it. Is it because internal connection is crossed? for example, u->x v-y w->z. What am I missing?
138 views

### Do corner-grounded deltas exist outside of USA?

Do corner-grounded deltas exist outside of USA? If yes, where? Where do you find information about this? Is there an IEC standard that dictates which transformers exist where?
81 views

### Three Phase Transformer Design

I design single phase transformers, around 400W - 8000W, but now im lost because i have to design a three phase transformer ( delta - delta connection ). I searched, trying to find a page that can ...
1 vote
131 views

### Explanation of 4-wire Delta Transformer Phasor Diagram

I have been studying some of the Tx configurations for metering. I've been looking at a booklet called the Power Measurements Handbook, which is sort of an informal resource in the metering world. I ...
86 views

### Derivative of a waveform

I am self studying linear circuits and I came to a very basic problem. The problem: $$y(t) = e^{-t} u(t)$$ where $u(t)$ is the step function. Calculate the derivative of $y(t)^{\prime}$. My take ...
2k views

### Three-phase motor Delta/YY connection diagram and windings troubleshooting

I am trying to troubleshoot this 1.4 kW three-phase motor and I'm unsure how its internal windings are interconnected or whether they are shorted. On the plate it says "Delta/YY 400 V", and ...
138 views

### Need to convert 240vDC to 3-phase "high leg delta": can an inverter be avoided? [closed]

I want / need to take a 3kW, nominally 240vdc say again DC and obtain "3-phase, high-leg delta (aka wild-leg delta) from it. (I won't answer questions on why, but if I feel the need later, I'll ...
256 views

### Zero current assumption in star - delta transformations derivations

The formula used for star delta transformations are: $$R_A = \frac{R_{AB} R_{AC}}{R_{AB}+R_{AC}+R_{BC}}$$ and $$R_{AB} = \frac{R_AR_B + R_AR_C + R_BR_C}{R_C}$$ The normal way that these formulae ...
750 views

### Can I drive a 3-wire-delta-input appliance with a wye-output transformer?

We have a high-current industrial machine rated for 3-phase at 230 V; the nameplate literally says "PHASES: 3Ph + PE", "VOLTAGE: 3X230VAC", and "FULL LOAD: 92A". There ...
202 views

### Is the Y connection advantageous for power supply?

I have heard that 'Y' connection is advantageous for the three phase supply and '∆' for the three phase load e.g. a motor. Please tell me if this is correct and if so why.
1k views

### Why this motor shows delta 220 / star 380 which is usually the other way round from what I know? [closed]

Brand new induction motor arrived in the factory,it comes with gearbox on top controlled by VFD, but I could not understand it's nameplate, it should have shown just delta / star without voltage ...
199 views

### Why is one current reading ~20% higher than the other two in a balanced high-leg delta load?

We are using eGuage watthourmeters to monitor the outdoor unit on five VRF systems powered by two different 3P4W 120/208V high-leg delta panels. The neutral is not connected to the outdoor units. We ...
1 vote
165 views

### Relation between line voltage and phase voltage in delta configuration

I have read answers pertaining to this same question, but I could not understanf why the phase voltage is equal to line voltage. This answer says: In a delta system, the two points required to ...
900 views

### I need help understanding the total impedance in a delta connection

I'm trying to upskill by teaching myself electrical engineering. I already have a degree in theoretical physics and pure mathematics so I don't mind math-heavy answers. While I don't find the maths ...
1 vote
279 views

### In delta motors, the power factor angle refers to the phase current or line current?

A 600V, 60Hz, ∆-connected, 8-pole synchronous motor has a synchronous reactance of 0.15Ω and armature resistance of 0.02Ω. This motor has an output power rating of 46 hp with a 0.90 lagging power ...
244 views

### Multisim delta-delta connection

I try to simulate a delta-delta transformer connection in Multisim but I get an error, why, I don't know. My diagram is as below: Here are the errors:
415 views

### Difference between "Rated voltage" and "Max. switching voltage" in relay datasheet

I'm looking for PCB EM-relay for switching 25A 380V load, and there is a lack of models on the market. I have find one of them. The T9G relay has MSV = 480V, but rated voltage = 277V. Also in header ...
1 vote
240 views

### Single phase motor starting from high leg voltage

Typically stinger voltage is said to be nonuseable, the 208V between a high leg and a bastard tap. High-leg-delta configuration (Wikipedia). But since single phase motors require a phase offset to ...
1 vote
354 views

### Solving for phase currents given line currents and line voltages in 3 phase unbalanced delta load

I am given the line currents and the line voltages for an unbalanced 3-phase delta connected load but need to solve for the phase currents on the legs of the delta load. I know that: I_{L1} = I_{a} ...
537 views

### In a delta wound 3-phase motor, how are the phase and line voltages equal?

After researching the 3 phase delta configuration, I'm confused as to how these three line-to-line and phase relationships can all be true. I have found the voltage/current relationships here , and ...
1 vote
1k views

### How to solve this star delta problem?

Please help me solve this star delta problem: My attempt: What to do next to solve this completely?
178 views

### Problem figuring star delta starter circuit

I know the basic functioning of star delta motor starter configuration but kind of stuck on my current project which uses old L&T starter panel. I can't figure out the terminals like A1, A2 (coil ...
50 views

### Open-Delta 3-phase transformer kVA rating

I have a V-V three-phase transformer supplying a 50kVA balanced three-phase load. I know that the apparent power of a three-phase transformer $S_{3\phi} = 3VI^*$ and that of an open-delta system is \...
743 views

### Only 3 wires in 3 phase motor terminal box

I have a 3 phase motor with the nameplate below At the terminal box you have your standard 6 pins labelled u, v, w, u1, v1, w1. However, the u1, v1, w1 is not connected on the terminal block but ...
541 views

### 3 pole SSR with Neutral connection

I am designing a heater block using 12 heaters. Each one has 200W/230V ratings. I have decided to use 3 pole SSR for control heaters with help of PID temperature controller. The SSR manufacture ...
657 views

### Why delta connections are done when the motor is required to be operated at 220V?

I am working with a tip dresser which is used for dressing the tip of the welding gun. A motor is used in that tip dresser which is used to rotate the cutter to dress the tip. There are two provisions ...
741 views

### Star Delta Starter control with Arduino

I don't have any experience with star delta starters but on doing some research I concluded that 2 push buttons (NO and NC) are required to turn on or off the system. I have a pump which is star delta ...
1k views

### Delta-Star Combination Exercise

This post is regarding exersise 4-8 from the following book: Hughes Electrical And Electronics Technology 10th Ed. Here it is: Let's focus on what I tried for solving part (b) : Since this is an ...
1 vote
250 views

### Current in delta connection

I know how to calculate current in delta connection but just for knowledge purpose I wanted to know from basics why this method(in image) of calculating phase and line current is completely wrong ...
3k views

### Motors Delta/Star connections to VFD

I've selected 230/400V motors (delta/star) and corresponding 400V VFDs for pump motors. Now I've been asked why I haven't selected 400/690V motors (delta/star), that are the standard and usually ...
1 vote
93 views

### What is the correct way to solve this problem?

I first solved it by converting the two star connected networks into delta networks and further solving them. Then I solved by considering one star, converted that to delta and then used parallel ...
278 views

### Calculating Phase wise Energy in Three Phase System

In three phase three wire system, is it necessary to calculate phase wise energy? As per my knowledge, in three phase three wire system we are concerned about only total power/energy. But does it ...
1 vote
109 views

### 4Wire 120/208 High leg delta - 320v to ground, 420v to C phase?

I have a 120/208 High leg delta service 4 Wire. 208v/120v/120v The reason for the call is main breaker failed. I get there and the 1 bus bar is not being powered by the main but the other 2 are. ...
262 views

### Star to delta transformation circuit

Is it possible to use star-to-delta transformation on this specific circuit below? If it is possible, can someone give me a hint on how to do it? I tried to do delta-to-star transformation and got the ...
1 vote
2k views

### Charger Delta Electronics ESR-48/40A E Voltage and Current Adjustments

Does anybody know how to change (i.e. program) the output voltage and limit the output current in the Delta Electronics ESR-48/40AE charger? The following web pages: this one and the next one have ...
16k views

### Three-phase motor connection, 230 V delta or 400 V star?

I have a motor with these specifications: star 400 V delta 230 V The motor is of course 3-phase. How can I connect the motor using a delta connection if I have only 400 V line-to-line voltage? Where ...
91 views

### Delta to delta 2000 kVA transformer

I have a delta to delta 2000 kVA transformer that on power up with no load except whatever is in the main switch gear I am getting 400 volts to ground on one phase 280 on another and 95 on another, ...
39 views

I have been trying to determine whether or not I can run one line from 3-phase power into a power conditioner that requires single-phase input. The current draw on this line would be around 10 A. ...
12k views

### Why don't the currents clash in a 3 phase delta connection?

Consider 3 windings, a, b and c. L1 is connected to A, L2 to B and L3 to C. The 3 windings are then connected in delta. If we could freeze frame the voltage waveform where L1 and L2 are positive ...
477 views

### Where does the sum current of the three currents flow?

In the following star and delta connections, if each individual current enters via Phases R, Y and B, where does the sum of the three currents (that is Ia+Ib+Ic) flow after meeting at the common point ...
2k views

### what will happen if the motor that is designed for delta connected in star connection

I have a motor which is designed for 3 phase, 380V. The power rating of motor is 132kw and motor stator winding is connected in delta connection. If I connect the same motor stator winding in star ...
42 views

### AD7173-8 gain register default value

In the AD7173-8 ADC, the default gain value is said to depend on the IC type. In the datasheet, the value is mentioned as 0x5XXXX0. But I couldn't find the exact value in the datasheet anywhere. ...
231 views

### How to implement a dirac delta as input signal for this system

y[n] = b0x[n] +b1x[n-1] I have this MA filter in matlab as following ...
1 vote
4k views

### How is Line and Phase Voltage the same for a Delta connected system?

I am having a little bit of confusion for some reason understanding how the phase and line voltage can be the same for a delta connected system, i understand why the current is different for the phase ...
6k views

### 3 phase motor running on single phase using steinmetz delta connection

How do 3 phase motors manage to run on single phase power using the Steinmetz delta connection with a single capacitor? I thought capacitors only shift the phase angle upto 90 degrees, whereas 120 ...
98 views

### how to get the line voltage of 3 phase delta circuit with power factor known at first?

In the following picture, it shows that a black box at right. the circuit inside the black box is a 3 phase load balanced delta connection circuit. the line voltage of it is 500V and the power factor ...
144 views

### Fourier transform of a sum of 2 delta function

i have a channel impulse response $h(\tau,t)=\delta(\tau-1/4t)+b\delta(\tau-T)$ if I would like to take Fourier transform, I can take FT for each delta function and then sum up a result. \\$FT(h(\... 