# 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 ...
• 786
1 vote
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 ...
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. ...
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
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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### 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:
• 3
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### 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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1 vote
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 ...
1 vote
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} ...
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 ...
1 vote
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?
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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### 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 \...
• 141
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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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 ...
• 791
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 ...
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 ...
• 143
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
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 ...
• 1,124
1 vote
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 ...
1 vote
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 ...
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 ...
1 vote
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. ...
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 ...
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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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, ...
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. ...
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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### 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 ...
• 705
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 ...
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. ...
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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1 vote
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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### 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 ...