Questions tagged [single-phase]

AC power with two legs run 180 degrees out of phase

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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 ...
Cinverse's user avatar
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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 ...
Cinverse's user avatar
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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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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 ...
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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 ...
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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 ...
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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 ...
aldobranti's user avatar
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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 ...
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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....
Nederealm's user avatar
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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 ...
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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 ...
Jacksmith's user avatar
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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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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: ...
Casey Combs's user avatar
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2 answers
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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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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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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 (...
Awais Saeed's user avatar
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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 ...
Glean Spann's user avatar
1 vote
1 answer
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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 ...
Dmitri Nesteruk's user avatar
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1 answer
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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 ...
Freshman's user avatar
3 votes
2 answers
319 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 ...
Tomalele's user avatar
5 votes
2 answers
226 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 ...
garvamel's user avatar
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PWM with Unipolar Voltage Switching in Single Phase Full Bridge-Odd vs Even frequency modulation ratio mf

I simulate a Single Phase Full Bridge Inverter in Matlab/Simulink and PSIM and the control method that I use is PWM with Unipolar Voltage Switching. In the book "Power Electronics Handbook", ...
Dr. Quest's user avatar
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Electrical diagram for a single phase switch, two way switch and ESTOP

I have a need to do an electrical diagram with the following components: Single phase motor (GGM the motor is 110V, single phase, 60Hz K91P60FU-T5.) It has five leads according to the data sheet. ...
CuriousRover's user avatar
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2 answers
190 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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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 ...
Epe's user avatar
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2 answers
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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 ...
MindXpert's user avatar
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1 answer
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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 ...
user137684's user avatar
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1 answer
661 views

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 ...
Engineer's user avatar
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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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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 ...
Boatelectrician's user avatar
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1 answer
234 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 ...
Keith's user avatar
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1 vote
2 answers
62 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: ...
jstarek's user avatar
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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 ...
mikux111's user avatar
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2 answers
347 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 ...
someEEquestions's user avatar
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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
DIY-CAJUN-WAY's user avatar
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1 answer
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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 ...
Jashanjot Kaur's user avatar
3 votes
1 answer
357 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 ...
Ankit Kumar Vishwakarma's user avatar
1 vote
2 answers
939 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 ...
Rick2000's user avatar
15 votes
12 answers
10k 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 ...
9Harris's user avatar
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744 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 ...
Clone's user avatar
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2 votes
3 answers
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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. ...
Max Lipnik's user avatar
2 votes
2 answers
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 ...
Matt Young's user avatar
1 vote
1 answer
245 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 ...
user336818's user avatar
0 votes
1 answer
827 views

SCR bridge control circuit

I want to design a single phase 400V 1A power supply using mains (230VAC,50Hz). For which I plan to use a step up transformer which will step up to 400V and then an SCR Bridge rectifier to convert it ...
Munazzah Taimuri's user avatar
1 vote
1 answer
260 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 ...
Andrew Graham's user avatar
0 votes
2 answers
865 views

Fan humming sound when decreasing speed with a dimmer [closed]

I am using a ~large 400mm wall mounted metalic fan (specs below). I wanted to decrease the speed (and noise) with light dimmers (I tried 2 models so far) but when speed is decreased it makes humming ...
adrianTNT's user avatar
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1 answer
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How to generate sinusoidal signal using hybrid SPWM modulation in single phase inverter?

I understand there are bipolar, unipolar SPWM. Since the switching loss is quite high in these, there also exists a hybrid scheme where for half of the cycle the gates are either on or off reducing ...
KesSap's user avatar
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0 answers
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Transformer load

I have 50 kVA delta-wye transformer with 3 single phases secondary (line-neutral) delivered to 3 houses, So if one of the 3 houses drown more power would that affect another 2 houses, or each phase ...
Muhammad Al-Moradi's user avatar
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0 answers
158 views

error iteration limit reached ,I'm a beginner to ngspice I'm using ngsipce by esim fossee help me out pls?

enter image description here I m trying to single-phase bridge inverter. here I have attached the error image, Schematic, source detail(pulse generator, Dc) transient analysis time. If I'm done a ...
Mohamed Abdullah's user avatar
6 votes
4 answers
2k views

Single phase 3-speed AC motor won't start spinning or spins in wrong direction

I have a Danby DPAC8399 air conditioner, and its fan motor started acting strangely. Sometimes, it it will only do a hum and won't start, and other times it will do that hum for a few seconds and then ...
Jean-François Beauchamp's user avatar