Questions tagged [delta]

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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 ...
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1 vote
1 answer
65 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 ...
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28 views

Power factor calculation for 3 phase IM using current and voltage measurement

How to calculate power factor for a 3 phase IM with delta connection ? I can measure line current waveform and phase voltages (between each conductor and a common reference) for all three phases. ...
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2 votes
1 answer
51 views

I need help understanding what the total Impedance in a delta connection is

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 and don't find the math's of the ...
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1 vote
1 answer
49 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 ...
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-3 votes
1 answer
89 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:
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  • 3
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2 answers
78 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 ...
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  • 33
1 vote
1 answer
96 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 ...
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1 vote
1 answer
69 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} ...
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0 votes
1 answer
67 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 ...
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1 answer
105 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?
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41 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 ...
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33 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 \...
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  • 141
0 votes
1 answer
278 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 ...
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2 answers
136 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 ...
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  • 791
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1 answer
186 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 ...
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0 votes
3 answers
416 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 ...
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  • 143
2 votes
2 answers
537 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 ...
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1 vote
1 answer
120 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 ...
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  • 1,124
1 vote
2 answers
1k 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 ...
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1 vote
1 answer
88 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 ...
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0 votes
2 answers
115 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 ...
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1 vote
0 answers
42 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. ...
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0 votes
1 answer
96 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 ...
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0 votes
1 answer
1k 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 ...
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1 answer
70 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, ...
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0 votes
1 answer
39 views

Loading one line from Three Phase Power Delta Configuration

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. ...
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2 votes
1 answer
11k 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 ...
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0 votes
2 answers
205 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 ...
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  • 705
0 votes
1 answer
987 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 ...
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0 votes
1 answer
31 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. ...
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0 votes
1 answer
203 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 ...
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  • 101
1 vote
2 answers
3k 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 ...
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2 votes
2 answers
5k 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 ...
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0 votes
1 answer
72 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 ...
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1 answer
77 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(\...
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0 votes
1 answer
65 views

"3 phase" Type of winding I am not aware of, help? not wye or delta, maybe eFed up generator?

I bought a few 30 watt 3 phase motor/generators in supposedly delta configuration from a ali express. the motor did have only 3 wires coming out, plus the manual stating it, I am pretty sure this was ...
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0 votes
1 answer
633 views

Why use a star or delta connection instead of having a second output

I am winding my own small three phase ac alternator and have learned about star and delta connections. Should I use 2 three phase rectifiers to turn the current to DC or only one with a star ...
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3 votes
1 answer
88 views

3 Phase "Black Box" Load

I'm doing a few basic load calculations on a 3 phase circuit at work and I stumbled on a concept I'm not sure how to proceed. Let's say you have a 3 phase load and it is basically a black box. For ...
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0 votes
1 answer
119 views

Delta Modulation Frequency in the Integrator

Ok guys, I can't understand a thing, I have made this circuit, that is a delta modulator: As you can see with an input of 5Vpp, in the output of the integrator I found a square wave signal, that has ...
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2 votes
1 answer
622 views

Confusion with applying KCL to three phase delta connection

Below is a 3-phase delta connected for balanced loads Z: Since phase to phase voltages(voltage across loads) have 120 degrees phase differences and since the loads have the same impedance we can ...
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  • 3,340
1 vote
1 answer
316 views

zig zag vs open delta

Can we use zig-zag connection of transformers instead of open delta in electrical distribution ? If yes, then which one is the more preferable compared to other and why ?
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  • 196
0 votes
1 answer
65 views

3-phase system with 3 loads instead of 2?

Hello, Most examples on the internet and in my text books contain 1 load with 1 source. I have yet to come across an example with 3 loads. Is there a way of combining the loads?
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  • 179
0 votes
1 answer
42k views

Problem in star delta starter in air compressor

I am a beginner in electrical engineering. I am trying to understand how motors are connected in a star and delta system. I studied the star delta starter from this link. It describes the connection ...
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  • 791
1 vote
1 answer
56 views

Delta total line current - Basic electricity problem

I'm reading the book Basic Electricity from Milton Gussow and there's a problem that is driving me crazy, I'm not able to get the result. Can anyone provide me with a guideline to resolve it? This is ...
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1 vote
2 answers
3k views

3 Phase Delta with Ground Reference?

When I was at work the other day, one of the techs showed me a delta connected power supply in which the phase to phase voltages measured 120Vrms. What didn't make sense to me was when he measured the ...
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  • 1,137
0 votes
1 answer
5k views

What happens when one of the 3 Phase load is disconnected suddenly?

I am sorry if I am asking trivial question. I tried to search previous questions but unable to find it, there is only question on what will happen if neutral line disconnected. My question this time ...
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2 answers
84 views

Logging 3-phase power

I need to measure and log power, and I want to do it mostly correctly. I would greatly appreciate a listing of the errors I have made in my method. I want to measure (and log) the power output of a ...
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1 vote
1 answer
55 views

Impulse response of a LTI TD system

Why the impulse response of this system: \$y(n)=\sum_{|k|\leq3}^{}x(n-k)\$ is: \$h(n)=\sum_{|k|\leq3}^{}\delta(n-k)\$ and the impulse response of this one: \$y(n)=\sum_{k=0}^{+\infty}x(n-k)\$ is:...
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2 votes
1 answer
2k views

Fundamental period of periodic delta function

I have the following signal: $$ x[n] = X\sum_{k=-\infty}^{\infty} (\delta[n − 4k] + \delta[n − 4k − 1] − \delta[n − 4k − 2] − \delta[n − 4k − 3])$$ The fundamental period of this signal is \$4\$. Is ...
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