# Questions tagged [single-phase]

AC power with two legs run 180 degrees out of phase

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### How does this 230/400 V induction hob draw current?

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 ...
1 vote
89 views

### 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 ...
162 views

### 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 ...
106 views

### 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, ...
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76 views

### Spinning single phase induction motor while having no power

I have a single phase induction motor connecting to a spindle. The motor is connected to a electronic speed controller and I believe it has a series capacitor. If spindle are to be spin while motor ...
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57 views

### Ground Fault Interrupter

I was trying to simulate a circuit where it can detect grounded neutral conditions in the household. I need to have a current transformer which can detect the current differential ans sends a signal ...
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47 views

### What are the meaning of the simple directional arrow above the double arrows in this schematic?

Helo,, I would like to know what are the simple directional arrows above the double arrows in this schematic?.
74 views

### 0 V across motor capacitor terminals, but resistance is 20 Ω. Is the capacitor dead?

It is a 36 μF, 440 VAC, 50 Hz rated motor running capacitor, used in a single-phase motor. AC source is 240 V, 50 Hz. The motor has stopping working. I want to know whether it is due to a faulty ...
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79 views

### How to find out whether capacitor is the fault for failed single phase motor?

Single phased motor rated for 220V, 50Hz isn't working. I want to know whether is it just due to a failed capacitor or is the motor itself is damaged. The capacitor looks clean from the outside; no ...
• 31
69 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 ...
101 views

### How to ensure single phase AC polarity?

The device I'm designing needs to have correct power supply polarity but will be connected to mains supply with unpolarized plug. What automatic and IEC standards compliant methods there are to ensure ...
• 395
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### Single-phase voltage inverter

I'm currently working on a single-phase voltage inverter with MOSFET transistors and RL load. I would like to realize width control of the inverter with independent frequency and program settings ...
84 views

### DC Load Current Vs RMS Load Current in single phase half wave rectifier

While solving a problem of a single wave half wave rectifier. using an "Ideal Diode" Given Details: Load Resistance - 1020 Ohms Supply - 230V 50Hz AC (Connected in series) To find : DC ...
38 views

### How do I model domestic power demand and identify consumers by their resistive and reactive draw

I put a commercially available 80 A current transformer on the live tail to my domestic fuse box. I obtain readings of current draw, supply voltage and power draw. When an appliance is turned on I am ...
1 vote
301 views

### HLW8032 energy meter circuit showing power usage at no load

I am designing an AC energy metering circuit. The circuit has to measure voltage, current, power, power factor and energy used for two channels (from the same source). The HLW8032 transmits 24 bytes ...
• 103
4k views

### Can I utilize 3 phase power in a single phase appliance by connecting all 3 lines in parallel?

I can't seem to find an answer to this. Assume we have a 400V three phase power source. Connecting phase-to-neutral will give 240V. If you connect them in parallel you should still end up with 240V AC....
• 167
177 views

### Single phase induction Motor starting capacitor not disconnected

I have studied the single-phase induction motor and have a little confusion regarding it. I have seen many people using a switch with the phase shift starting capacitors so that after the start the ...
• 669
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### What is the effect of a capacitor in series with a bridge rectifier?

I kept a DC blocking (or AC coupling capacitor) in series with a single phase AC line followed by a bridge rectifier. What I observed was that when I removed the capacitor (10nF), the voltage at the ...
276 views

### Is there any benefit to converting from single to 3 phase AC before a DC conversion?

Compared to single phase, 3 phase AC produces less ripple in the resulting DC waveform when rectified. At the capacitor filtering stage, it is much cleaner with less sag than filtered DC converted ...
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1 vote
800 views

### Changing a 3-phase motor for a single phase motor

My work is getting rid of their commercial power washer. It has a 5 hp, 1750 RPM, 3-phase motor on it. Can I just buy a 5 hp 1750 RPM single-phase motor and swap it out and everything will work? Edit: ...
72 views

### How to get 220 VAC from 2-phase 110 VAC

I purchase Dental sintering Oven KDF Zircom Speed which have single phase 220 VAC. My problem is my wall plug have 2 phase 110 V AC. What can I do to have single phase 220 V AC?
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1 vote
65 views

### Phase splitting principle of single phase induction motor

How two sinusoidal flux 90 degree out phase creates a rotating flux? In particular if A = sin(wt) and B = -cos(wt) are two flux produced in a single phase induction motor. Then their resultant would ...
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608 views

### How a 3-phase system delivers more power?

In a 3-phase system, when one phase hits the peak and is about to go down, the next phase starts hitting the peak, and there would be a total of six peaks as compared to two for a single phase system (...
600 views

### Can I wire a three phase, nine wire dual voltage motor for single phase 220V?

I have a 5hp nine wire, three phase dual voltage (low / high) motor and I need it to run on 220V single phase for an air compressor. Please help - I've had several "electricians" say they ...
1 vote
48 views

### Modular equipment to detect N and L swap in single-phase 230VAC feed?

Say I have a single-phase feed with N and L (no PE) that comes into a distribution board. I have equipment for detecting over/undervoltage, but what equipment can I use in order to detect someone ...
116 views

### Current Transformer Connections - Resistors and Capacitors

I was just going through the purpose of the current transformer and its working & using. I found some schematics where I found a common pattern as below. It is a single-phase connection. Line and ...
435 views

### What is the purpose of the capacitors in this motor controller? Why is one smaller than the other?

I recently purchased a few single phase 230V motorised hoists and I want to understand their wiring and how they work. I can more or less follow what's going on, I just don't fully understand why ...
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293 views

### Help with (very) odd single phase motor wiring

I think this is my first post here. I have little knowledge on AC motors, and this machine I am servicing (an old Balltrap/Clay target shooting machine) left me baffled. The below diagram is a ...
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1 vote
424 views

### Single-phase diesel generator to three-phase modification

I have a 220 V, single-phase diesel generator and I would like to know if it's possible to modify it to generate 400 V, three-phase. I have never tried this before.
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1 vote
1k views

### Single Phase (L1&L2) in 3 Phase Supply Calculation

I have multiple single-phase loads required to be powered from a 3 phase supply with neutral (208/120) V. I'm going to tap to (L1, L2) & (L2, L3) and (L1,L3) respectively. Assuming the load was ...
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2k views

### How do utility lines wire transformers to go from 3-phase power to residential split phase?

I'm trying to understand how power distribution lines go from 3-phase to single-phase and haven't been able to find a concrete explanation. I understand that power companies transmit with 3-phase ...
134 views

### Solving the problem of connecting a high-current, single-phase load to a three-phase balanced network

I am an electrical technician working in a hospital. In the laundry room, all the cloth washers contain three-phase motors which are balanced loads connected to a 140 A circuit breaker. The ...
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### Calculation single phase and three load connected at the same time to three phase network

I have a single phase load (90 A 230 V) and 2 three phase loads (7 kW 400 V 3 phase/9 kW 400 V 3ph+N) connected at the same time to a three phase network. How the 3 phase calculations (line current of ...
1 vote
54 views

### Trying to get a 10uS pulse width to fire an SCR using a PIC16F884

I have the circuit built and running but I need to shorten the pulse width of the SCR. I am using a PIC16F884 running at 16MHz. I am using a half wave to control a device. When I use a for next loop, ...
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1 vote
71 views

### Yacht generators with common neutral - Voltage Balance & Harmonics

In a marine application, a yacht using two generators (not connected in parallel), to feed 7 separate circuit panels, separated disconnects but common neutral. Both generators have their neutral ...
278 views

### Can a single phase supply from a 3 phase outlet result in excessive power meter readings?

Here in Turkey typical residence supply is single phase at 230V. Years ago a friend's father built a residence and arranged for a three phase supply as he felt that this would provide a more stable ...
1 vote
65 views

### How do plug-in photovoltaic cells work with three-phase current electricity meters?

First off: I'm German, and while I have a bit of knowledge of electrical distribution systems, I am not too experienced with English terminology for the technical terms. So please bear with me. Also: ...
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1 vote
106 views

### Why is the grid current of this single-phase AC/DC rectifier not an AC sinusoidal waveform?

I drew a single-phase AC/DC rectifier in PLECS and used bipolar PWM to control it. Here's my calculation process and related parameters (the duty cycle of Vtri is 0.5): I think my calculation is ...
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493 views

### How does neutral in single phase AC work?

How does neutral in a normal one-phase outlet work? I looked on the internet and I know it carries the current back to the source, but does it do that in the inverse of the phase or does it provide no ...
93 views

### What ohm readings should be expected when testing the input terminals on a 3 speed blower motor that has been separated from all attachable wires

GENTEQ ECM 3.0 MOTOR WITH MODULE MODEL:5SME39SXL3019 1 PH 60/50 Hz 3/4HP 120/240 V 9.6/5.6 A 1050 RPM Cust. Model 51-102603-01 GC09
451 views

### How can I control a 5HP single phase motor with an Arduino UNO?

I am able to switch ON and OFF 1.5 HP single phase motor (current rating of 8A) using a relay with a rating of 10A, 250VAC (SRD-05VDC-SL-C.) What can be used to connect a 5HP single-phase motor (28A ...
403 views

### Does the dropper between the catenary wire and contact wire carry current?

From my observations, droppers are of metal and they do not have any insulation from the catenary wire or from the contact wire. The catenary and contact both carry the same phase and voltage so any ...
1 vote
1k views

### AC single-phase fan motor works (almost well) without start capacitor, but not with the correct capacitor connected?

I have a fan motor from a mobile a/c unit here which stopped working. It is for the fan that blows the warm/hot air trough the a/c condenser (exhaust air). 240V AC motor with a 4uF (+/-10%) 450V ...
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12k views

### Why is North American residential power called single phase?

I am under the belief that North American residential power is a special case of two phase power adequately described by the term split phase. Clearly I am in the minority and want to be convinced ...
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1 vote
847 views

### Connecting peak voltage, RMS, line-to-line and line-to-neutral

In EU the line-to-neutral voltage from a power outlet which is single phase (if I understand correctly) is 230V RMS and 50Hz. Then the line-to-line voltage (for the three-phase connection coming to ...
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904 views

### Is there a device to use 3-phase 400 V and convert into 230 V 1-phase?

I only know basics about electrical power and basically don't know anything about converters/inverters/transformers. My situation is: I have an EV that I can charge only using 1 phase, up to 6.6 kW. ...
3k views

### Difference in wire gauge for three phase and single phase domestic power supplies

I'm trying to understand why the recommended wire gauge for a domestic supply depends on whether you're getting three phase or single phase power. Specifically I'm talking about when the power rating ...
1 vote
417 views

### Small motor seized

Alright I'm trying to get my pellet grill up and running prior to Thanksgiving and I seem to have a seized motor. The past few days I was working on clearing a pellet clog in the middle of the auger ...