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Questions tagged [three-phase]

AC power with three legs run 120 degrees out of phase

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3-Phase system Voltage conversion

If we are converting from Y to delta configuration or vice-versa, how do we convert the phases of our voltages? I've seen that we need to add or subtract 30 degrees from one another, but I don't ...
Electricity's user avatar
1 vote
1 answer
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How does this 230/400 V induction hob draw current? [closed]

The instructions that came with a new Electrolux EIS62441 induction hob didn't specify any recommended breaker sizes or supply cable cross section requirements. The hob comes with more than 1 m of ...
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Three phase rectifier output current

I´m designing a three phase power transformer, and i´m having troubles with the choosing the current value. After the transformer, goes through a three phase bridge rectifier ( full wave and not ...
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Help decoding weird Id current behavior at high motor speeds!

I have implemented a motor controller which employs FOC to control the speed of a PMSM motor, similar to this: Normally Id reference (IDref) is set to 0 and only the Iq reference (IQref) (quadrature ...
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Need Help with DIY Phase sequence meter

I have seen this video: https://www.youtube.com/watch?v=HyrhW_gnQEM and I am really interested in creating DIY version of this for induction motor. Surfed through internet, but could not anything ...
Ratnesh Aroskar's user avatar
1 vote
1 answer
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BLDC DR8305 design 42A

I'm trying to design my own PCB to control 4 x 300W three-phase motors with the DRV8305 BLDC and an STM32F401, but I have a problem with the number of PWMs available. To solve the problem of the ...
Paulo971's user avatar
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2 answers
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Is it possible to use a three-phased 400V, 36A AND and additional single-phased 230V, 16 A in one machine?

We're currently still developing our machine and have made this suggestion to a building technician, who replied that he cannot imagine our machine to have these connections. We'll work with ...
Robin Steblea's user avatar
1 vote
1 answer
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Ideal 3 Phase Rectifier [closed]

I am working on a 3 phase PFC and implementing third harmonic injection. In order to do so, I use the min-max method. This would be trivial in an MCU, but everything is being done in analog. I have ...
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Three phase motor with 3 sets of connections. Star, delta, and something else?

What's going on with this motor ? It's not simply wired into a star/delta starter. There's a 3rd option I'm not familiar with. The legend below and to the left shows Star/Star-Star/Delta.
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Feasibility of Using Xinya XY2500 4-Pin Pluggable Terminal for Three-Phase PCB

I am designing a PCB for a three-phase system and considering using the Xinya XY2500 4-pin pluggable terminal connector (pitch 5.08 mm, rated 15A @ 300V) to connect R (Phase 1), Y (Phase 2), B (Phase ...
Shubham's user avatar
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I have problem with finding the equation of AC to DC voltage for three phase five wire rectifier [duplicate]

I am writing a thesis about telecommunication tower. A problem came up when I examined the power supply. Most telecommunication equipment uses -48V DC and my supervisor wants me to add the equation ...
khant pyae 's user avatar
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1 answer
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Single transformer unit with identical groups of Dz windings around the same core

Background I’m working with a three phase transformer with a 480v Delta primary and a 240v Zig Zag secondary. However, it actually contains two primaries (combined in parallel) and two secondaries ...
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Clarke transform seems to result in more current

I am looking into the Clarke transform for a balanced three-phase system (BLDC motor) and from all that I read, it tries to preserve magnitude. So if I apply this to the case of transforming three ...
Cheiron's user avatar
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Three-phase to single-phase converter to power a single phase load larger than one phase can supply

Is there such a device (e.g. a VFD) that can take a 6 kW 3-phase service (240 V 10 A per phase) and output a single phase that will allow me to use a search light that needs about 14 A?
chris alyui's user avatar
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230V 3-Phase Power Supply for VFD and PSU Repair

I am repairing CNC electronics and need some lab equipment. I need a 3-phase, 230 V input for the power supply and VFD to debug them. Where should I look to get a supply for this? Is there something I ...
Ishmael's user avatar
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2 answers
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Power transformer design calculations

I´m currently designing power transformers in a pretty basic way, using AWG tables for the section of the copper wire, and not knowing what are the real losses, just overdesigning. Three phase ...
samuel mattio's user avatar
5 votes
3 answers
825 views

Telecom cables for power transmission

Summary: Can I use abandoned telecom wire bundles as a 3-phase neutral? Our campus currently has underground AC cables supplying 2 legs of 3 phase wye power to a remote (50 ft away) building. There ...
madarp's user avatar
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1 answer
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Reconnecting a water heater from three-phase to single-phase (220V) [closed]

I switched from three-phase to single-phase. Since the water heater was connected using 3 phases I need to change the connection to use it (It seems it could be done by changing the red/blue wires, ...
JinSnow's user avatar
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4 answers
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I made a 3-phase power rectifier circuit with "ideal" diodes. Is there anything I should change?

I made this 3 phase power rectifier with ideal diodes, instead of actual diodes. I basically just copied an ideal diode diagram and pasted it 6 times. It's for use on a wind turbine project, to ...
soconnoriv's user avatar
1 vote
1 answer
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How to make an ideal rectifier which can efficiently rectify 3 phase AC for power applications? [closed]

I'm working on a wind turbine project which needs to be able to rectify 3 phase AC with varying voltages. The lowest the input voltage will likely be is 2V, while the higher end will be 27V. I've been ...
soconnoriv's user avatar
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Need to make 380V and 415V 3-phase motors work with 480V 3-phase power supply. Will a 480V->400V autotransformer cut it?

I will have multiple 415V and 380V motors to power with a 480V/3-phase supply due to an international supply chain and tight budget. I would like to know if the solution to my issue is as simple as ...
Popeye's user avatar
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High-power battery charging using a 3-phase to DC "benchtop" power supply

My team and I are designing a battery pack. I won't go into too much detail about the use-case and I apologise for being vague, but bear with me, I'll provide all the pertinent details. So, our pack ...
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Why does the valve symbol have a Clase symbol,or short-circyit symbol before the earth [duplicate]

Could anyone explain to me why the valve symbol have a shortcircuit symbol or termination symbol before the earth???
Daniel Prieto López's user avatar
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1 answer
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Symbol of short circuit (or termination) with an Earth

Can someone explain to me why the symbol of the valve arrester has a short circuit, if it is already earth? I don't understand why it is depicted like this. Why does the valve arrester have the symbol ...
Daniel Prieto López's user avatar
2 votes
1 answer
105 views

Meaning of this power system line diagram symbol

Please explain to me what this symbol means, in single line diagram? Source of image: My project diagram. Here is another example I found: Here is a magnified part, showing the symbol: Source of ...
Daniel Prieto López's user avatar
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Mathematical relationships of three-phase motors

I am developing an interface designed to calculate active, reactive and apparent power, power factor, capacitor value to be inserted (to make the correction) if necessary for FP = 0.95 and inform (in ...
Renan Saraiva dos Santos's user avatar
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1 answer
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What is meant by homopolar coordinate?

I am reading a textbook about power electronic converters which describes that for a motor with poles connected in a wye configuration, that If the homopolar component is zero, $$ V_A+V_B+V_c=0 $$ If ...
Gene's user avatar
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Three-phase transformer with only two cores?

I'm an electrician. My foreman said the transformer we're having installed is three-phase, but only has two cores. The cores are placed in separate compartments, with a divider between them. I've ...
Robert M.'s user avatar
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Sanity Check, connecting 3 phase solar inverter with only 3 wires Update

Here is an 3nd update to my post. Reference to inverter data is removed since it apparently caused misinterpretation of this post. This is not a question about a piece of equipment or how that piece ...
xstack's user avatar
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1 answer
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How to find the "voltage across each winding" for different delta and star connections in a three phase transformer system? [closed]

I have got results from testing with delta/delta, delta/star, star/delta and star/star configurations. I've got the line and phase voltages for each configuration for both primary and secondary coils. ...
Harri24's user avatar
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1 answer
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Watt meter connection in three phase circuit

Does the zero point "where all the voltage coils are linked " in this watt meter connection indicates that the power measured by each one of the watt meter is the phase to neutral or the ...
fr3j's user avatar
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1 answer
159 views

How do I power this 400V motor from 230V? [closed]

I just bought a lathe with a motor that used to be connected to 3 phase 400V. I am trying to power it using single phase 230V domestic mains. I understand that I can use a VFD to provide the extra ...
McClaw19's user avatar
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2 answers
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How is my isolation transformer not short circuited?

I received a 3 phase 240 to 208 isolation transformer, and I am unsure how the current configuration (as it was shipped to me) would not cause a short circuit. When I do an ohms reading on the high ...
JCoder's user avatar
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How can I choose the right stabilizer for a 3-phase 415 V supply system?

I have a question about how to select the right capacity of voltage stabilizer for a 3-phase supply system. That system has the following type of load and capacity: Two 1 hp 3-phase motor, 440 VAC (...
Bhushan Waghe's user avatar
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1 answer
50 views

How do you find the voltage in this three phase circuit?

The picture shows a circuit of 3x380/220V and it is asked to solve for the indication of the voltmeters. I can´t get any hint on how to find the Vc voltage. The box with the delta symbol indicates ...
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How do we calculate the current through two impedances in series by knowing the voltage of one and the impedance of the other?

I have a problem where I know the apparent power consumed by a Y-connected load and the line impedances, which I already reduced to work just with the line power (300kVA): the source and two ...
K. Rincon's user avatar
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2 answers
75 views

Should electric dryer work on NEMA 10-30 receptacle with 163 V to ground in commercial building with 3 phase service? USA [closed]

An animal shelter (in USA) where I volunteer has a new 240V Maytag electric dryer that will not operate (when "on" is pressed, the electronic panel gives a single brief flash of all LED's, ...
MadMonty's user avatar
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0 answers
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What is maximum possible current in neutral wire in three phase connector?

What is the maximum possible current in neutral wire in eg. 3x16A three phase connector? Is it possible that current leads or lags more than 90 degrees? Edit: Could the maximum be 16A∠0° + 16A∠(120°-...
JPX's user avatar
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0 answers
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Make a 0.5 HP, 3-phase motor work with single phase voltage with capacitor [duplicate]

I have a MGM Varvel's SM71B4 AC motor which runs on 3-phase that comes out of a Schneider Electric's VFD called Altivar ATV12H037M2. The VFD has failed and doesn't show the input voltage, so I decided ...
Akash Patil's user avatar
0 votes
2 answers
70 views

How does a power meter differentiate between three-phase and single-phase loads?

How does a three-phase power meter (for example the one used by my power company) know the difference between a single three-phase load and multiple single-phase loads? For example: a three-phase ...
Viktor's user avatar
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Breaking into a supply cable

I am just after general opinion on a situation. We are looking to install energy monitoring at a particular location. The company does not want the mains supply switched off and we need to install our ...
S Will's user avatar
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2 votes
2 answers
92 views

What is the best way to convert 3ph 380VAC to 3ph 0V >> 450VAC in range of 800 kW?

I have a company that makes servo AC voltage regulators and some other transformer-based products, and today some of my customers asked me to give him a quotation for an 800 kW Variac, the biggest one ...
AlMoutaz Billah's user avatar
2 votes
0 answers
61 views

Bugged Clarke Park transform on three-phase signal using Python

I'm supposed to apply a Clarke-Park transformation to an electrical signal so other people at my office can study the "quality" (?) of said signal. I was given a Jupyter Notebook replicating ...
J. Maria's user avatar
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1 vote
0 answers
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Why is wye-wye connection rarely used?

Fitzgerald's Electric Machinery book explains the following on chapter 2.7: ... The delta-delta connection has the advantage that one transformer can be removed for repair or maintenance while the ...
aulven's user avatar
  • 117
0 votes
2 answers
175 views

Control P-channel and N-channel MOSFETs by common PWM signal

I want to create a very simple 3-phase inverter that is easy to understand, e.g. without using MOSFET drivers. I decided to use logic level P-channel MOSFETs on the high side and logic level N-channel ...
Jonas's user avatar
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2 answers
154 views

Is there a 3-phase to DC converter that draws current proportional to voltage?

Of course, 3-phase alternating current can be converted into a rippling direct current with a 3-phase bridge rectifier. This design only draws current from the two phases with the most voltage ...
Electric-Gecko's user avatar
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1 answer
185 views

Can I use just two relays to switch between two 3-phase brushless motors sharing the same driver?

I have a 36V DC 3A (max) 3-phase brushless motor with it's own driver. I have a spare motor and I want to leave both motors connected to the same driver all the time, but only one motor will ever be ...
Rodrigo's user avatar
  • 567
3 votes
2 answers
881 views

3 phase induction hob, single phase wiring [closed]

While installing this 3-phase appliance I came across these diagrams which have been bugging me a bit, therefore it would be nice to find out what is the correct way to wire this up and what is the ...
floxia's user avatar
  • 109
0 votes
2 answers
77 views

Power calculation for single phase heat treat oven

We have an old heat treat oven that was intended to run off of 240V single phase (US). In actuality it is running off of two legs of a 3 phase 480V->208V (delta to wye) transformer. The ...
john8791's user avatar
0 votes
2 answers
120 views

Single phase current requirements and minimum transformer requirements

To start, a generator is not an option for my situation. I am looking to produce 208 V 3 phase delta using a rotary phase converter to power two robots. This is my first attempt at generating 3 phase ...
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