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Questions tagged [single-phase]

AC power with two legs run 180 degrees out of phase

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19 views

Readings for a current transformer reversed

What would happen to the measured values of a circuit (real power, apparent power, power factor, current) if I install a current transformer "backwards"? Usually a current transformer has some ...
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0answers
25 views

Finding equivalent circuit parameters for a single-phase AC transformer

Question: It is desired to find the equivalent circuit parameters for a single-phase 110V AC transformer. In the short-circuit condition, the transformer can be modelled by a series resistance and ...
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0answers
22 views

How to identify and wire leads on a one phase 6 lead, capacitor start, capacitor run electric motor

The leads are labeled U1, U2, U5, U6, Z1, and Z2. My research has found wiring diagrams on 4 lead motors where U1 & U2 are main winding and Z1 & Z2 are auxilary winding. Start capacitor wired ...
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73 views

2 pole single phase induction motor appears to have starting capacitor permanently connected (no centrifugal switch)

I am trying to repair and rewire an AC induction motor from a small compressor. From what I can tell it's a 24 slot, 2 pole single phase induction motor that has main coil and starting coil. The ...
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1answer
108 views

Capstone PCB for a Single phase power energy meter

I am an EE major in the process of working on my capstone project of developing a PCB of a Single phase power energy meter and I need help scrutinizing it. I Intend to interface this circuit with my ...
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3answers
563 views

How to connect this 3 wire AC motor?

I have this NEW heat recovery unit from Amazon (shady quality, branded as made in UK but actually made in China) with this motor inside. It was supposed to have two speeds (Low/Hi). Question: How ...
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3answers
115 views

What enables the home appliances and electronics to work on single-phase?

Talking about the home appliances and electronics, if it is single phase that we are using in houses and currents get to zero every half cycle, how do the home appliances (using AC) and electronics (...
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2answers
77 views

What will happen if we use an Inductor in place of a Capacitor in Single phase Induction motor

So as the titles says, well i know that a capacitor give phase shift and that results in a rotating Magnetic Field. So i was wondering what will happen if we use a an inductor, i mean doesn't it ...
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3answers
122 views

Why are the diodes in this circuit forward biased in spite of no current flowing through them?

Considering the following circuit, Normally in the +ve half cycle SCR1 is triggered after it takes its triggering gate pulse and then D2 becomes intrinsically forward biased so it's on and conducting ...
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2answers
57 views

Little torque of single phase asynchronous motor

I have a single phase asynchronous motor rated 230V, 500W. It has three terminals labeled U, V, W. I connected L1 to U and N to V (other way round makes no difference though). Between V and W is a ...
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0answers
51 views

Is there a cost savings associated with 3 phase power at the same device power requirement (kW)?

I am a Mechanical Engineer looking into purchasing an annealing furnace and have seen that some operate on single phase power while some operate on 3 phase power. I've done some research and have seen ...
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1answer
395 views

single phase 120V convert to 3 phase 208V

Can you convert 1-phase 120V into 3-phase 208V? If yes, whats the simplest way to do that?
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2answers
403 views

Ceiling Fan Speed Control stripped down

I am a novice but know enough to get by. I was given an older Hunter Fan that is only operated via Remote. I have cut the receiver out because I do not have the remote and from what I have read they ...
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1answer
161 views

What is the most efficient 3-phase to single-phase AC transformer for a home grid

So a friend of mine is getting electrical power installed for an urban site he bought, and I'm just trying to be a good friend by looking into this. The company doing the installation recommended he ...
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3answers
845 views

How are the individual homes connected in a 3 phase power distribution system (power grid) so that they have correct voltage?

For a single phase distribution system it's simple, each home has one wire coming from the neutral and one from the live, in turn each outlet has a live and a neutral wire. The live is 120V relative ...
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3answers
7k views

Three 1 phases vs one 3 phase power cost

Case1: If I have three single phase connections with each having its own single phase energy meters And I connect 1kw load on each of these phase continuosly 24/7 for a month. Case2: Now next month ...
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1answer
57 views

How do we design a control system with a mix of single-phase and three-phase electrical loads from a three-phase supply?

I have connected a three-phase incoming power to a MCCB, MCCB will distribute to a 3-phase transformer as well as few single phase equipment, which is means outgoing of MCCB L1, L2 & L3 to ...
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2answers
712 views

How is a higher torque achieved in a single phase cap-start cap-run motor?

The starting winding come capacitor circuit is there for starting the motor. When the motor reaches 80% rated speed, the centrifugal switch cuts the starting circuit out and leaves the run winding ...
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3answers
2k views

How do single phase BLDC motors start in proper direction?

There are descriptions on internet of the single phase BLDC motors which are powered by Vdc (such as PC cooling fans 12V). Interestingly pictures shown describing outrunner type with equal number of ...
2
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1answer
2k views

Single Phase Induction Motor Wiring help

I have purchased a Single Phase Induction Motor that runs anti-clockwise, I require it to run clockwise however I am unable to figure how to change the wiring to do this, any help would be appreciated....
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3answers
667 views

Can I use dimmer voltage regulator for single phase multi speed AC motor?

I have a swamp cooler motor which is single phase 3 speed motor, 1/7 HP i.e. 106 watts. I wish to reduce its speed (rpm) by 50%. Can I use this dimmer circuit to do so? This dimmer regulator is rated ...
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1answer
64 views

3Phase + Neutral, 208VAC distribution and conversion to 1Phase 120VAC

Question 1: How to convert 3phase+Neutral 208VAC supply to 1phase 120VAC? Can I tap off one (any) leg of the 3phase supply and use that to Neutral to get the 120VAC? Or do I have to use all three ...
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3answers
2k views

AC 220v Single Phase Motor Control using relay

i've been looking for a diagram for motor control using arduino and relays, and i only found tutorials using DC motors. i know you can use a contractor but for my project i want to be able to use ...
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1answer
142 views

Can a triphase current regulator be used with just two phases?

My house is located somewhere with power problems, these have been going on for 15 years and will probably never be fixed. Family lives next door and I want to regulate the power to both my house and ...
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3answers
74 views

Determining V and I from limited data

I am the recipient of an incomplete set of data for several 120 volt, single phase, AC drive systems driving induction motors under various loads. The measurements were taken at the AC voltage source. ...
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0answers
72 views

Power Distribution Units and Nominal Input Voltage

I am acquiring a facility with a single phase 400a panel. I am having an electrician run 240v, 30a outlets to the racks. My confusion/question is pertaining to APC power distribution units (PDUs). ...
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3answers
625 views

How can voltage be zero when current is non zero? (Single phase series circuits)

We were taught about single phase series circuits today and I had a bit of a problem understand this little thing. Let's look at this case 1) purely capacitive circuit It's said that current leads ...
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2answers
700 views

Help troubleshooting single phase motor

I have a single phase 230 volt motor. I am getting 230 volts (115 at each terminal marked with the red line in the image below). The motor is not drawing any amperage at all and is making no noise ...
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1answer
131 views

3-Phase Theory vs Practical example confusion

In theoretical examples, 3-phase circuits are shown as either Wye or Delta type. Wye obviously containing a neutral line. Recently I watched a Youtube video where the uploader re-purposed an old ...
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2answers
379 views

Can I rewire a 240 V 3 phase steamer to a 240 V 1-2 phase?

I have this steamer unit that came in as 240 V, 3 phase that I am trying to adapt to a 1 (2) phase household. The unit needs 60 A and generate 9 kW. As per the manufacturer, and the below diagrams, I ...
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1answer
2k views

Wiring a single phase 120/240VAC motor with 8 wires

We have a submersible motor. It is a 2HP, single phase, 120/240 dual voltage motor. This motor has 8 wires. U1, U2, U5, V1, V2, V5, Blue(not numbered) and Red(not numbered). How do i wire this motor? ...
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1answer
8k views

reversing direction of single phase motor

I would like to change the direction of rotation of a single phase 240v motor. I understand to do this I need to reverse the polarity of the start coil - but I'm not sure what wires are the start ...
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2answers
2k views

32amp single phase or three phase [closed]

Sorry if there is a straight forward answer but my partner has converted a trailer into a drinks unit. She has a fridge a freezer and a coffee machine. Also about 5double sockets and lighting. The ...
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3answers
1k views

Why use three-phase power distribution? [closed]

My question is about phasing? Why phasing is needed in power line? Can't we just use one conductor instead of two or more conductors? I already searched for it, but couldn't get any relevant answer.
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0answers
270 views

A spark coming from phase cutter to control AC Induction Motor using Arduino

So I have a circuit diagram to phase cut and then controlling speed of AC Induction Motor. With the code from arduino, I am able to know the zero cross and then cut the phase. It was working well ...
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2answers
3k views

How to calculate the DC rail voltage for Variable frequency drive (VFD) for single phase induction motor?

I am working on VDF for Sigle phase induction motor. I just want to compute the total voltage of single-phase induction motor that will need to create from DC link. I am not sure about the calculation....
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1answer
5k views

Phase Cut to Control Speed of AC Induction Motor with Arduino

simulate this circuit – Schematic created using CircuitLab So I'm trying to speed controlling a single phase AC Induction Motor(For Fan). And I am trying to use phase cutting to control it. So ...
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1answer
334 views

Rewiring AC motor with 8 wires to vfd [closed]

I am helping a friend who has an AC motor that was originally wired to run on 220VAC but from the looks it is wired to use two capacitors to (somehow) convert a single phase to a 3 phase... the goal ...
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1answer
319 views

Replacing a 220V single phase motor with a 220V split phase motor

I am replacing the motor on a whole house fan. The old one was 1/3HP 220V single phase. The new one is 1/3HP 220V split phase. Will the low, high and common connections be the same or is there ...
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3answers
519 views

What capacitor(s) will be best replacement

Living and working in West Africa. We cannot purchase capacitors here, we can only beg (and pay) used parts from the workshops which rewind electrical motors. Our gray-water-pump is broken, the ...
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1answer
309 views

Sending Voltage is higher than receiving voltage: Parallel Load Problem

I had a problem on an exam which reads as follows: At the end of the day, I got that the sending end voltage is lower than the receiving end voltage, which I know isn't possible. I think I may have ...
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2answers
24k views

How to wire 1-phase 3-speed motor [closed]

I have a single phase motor with five outgoing wires: white, brown, red, blue and black. white - has no resistance with any of the others. brown-blue = 136Ω brown-black = 366Ω brown-red = 108Ω red-...
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1answer
113 views

Determining whether a load is reactive and its reactance type by the phasor (phase angles)

I have been given the following question: A single-phase load is supplied by a single-phase voltage source. If the current flowing from the load to the source is 15∠-135° A and if the voltage at ...
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3answers
816 views

50 Volts on the Neutral (180 Volts on the Live) bad or safe?

We have an off-grid UK home on occasion powered by a generator (MOSA GE 6000 SX/GS). Due to the design of the generator, it has two modes: centre-tapped-earth 110 V, and 230 V. When running in 230 V ...
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2answers
55 views

Estimation of an orthogonal component for a single-phase PLL

I'm trying to implement a single-phase PLL, for which operation I need an orthogonal component of the grid voltage. Let the grid voltage be: $$v_g(t)=A\sin(\omega t) + \tilde{v}(t),$$ where the ...
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1answer
175 views

Neutral for 3 phase machines

When do we have to use a TP circuit breaker, and when do we have to use a TPN breaker, and why? I am specifically referring to 415 VAC 3 phase, 230 VAC in single phase, 50 HZ.
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1answer
385 views

Three phase short circuit and line to ground short circuit

Why is three phase short circuit calculated current higher than line to ground or (phase to ground) short circuit calculated current in most cases?
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3answers
305 views

If Input is above specific Voltage than only get output

I am from India. In our country we get 3 phase electricity only for 8 hours and remaining 16 hours either we have single phase electricity or no electricity at all. In three phase mode: The Voltage ...
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0answers
821 views

how can synchronize two single phase generators?

I need to a continues power supply for 3 day without interrupt. I use from 2 single phase generators that a generator work for 10 hour and next another startup. for uninterrupted power supply we need ...
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2answers
3k views

What does a reverse phase dimmer circuit look like?

I'm familiar with simple forward phase dimming using a triac. The circuit is stupid easy with only a handful of components. Of course this simple example can be improved upon to make it safer or ...