# Difference Between 220V & 380V 3-Phase Power Supplies: Understanding Inverters & Voltage Levels

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• #1
Szaruś
Level 12
What is the difference between 220V three-phase power and 380V three-phase power supply? Many manufacturers report that they have 3-phase products for these voltages. E.g. inverters 200 to 230VAC 1/3 phase or 380 to 460 VAC 3 phase power supply, etc.

As far as I know, the voltage between phase and "zero" is 220-230V, and between phases is 380-400V.
• #2
12robert12
Level 28
you are right, i.e. you can load 1 phase or 3 phases in a star in these inverters (1/3 phase = 1 of 3 phases), it will be 230 and if you connect 3 phases to the motor, for example, in a triangle, it is 400V.
• #3
Anonymous
Anonymous
• #4
Szaruś
Level 12
Ie. do I understand correctly, inverters powered from 3 phases in a star are 3-phase 230V, and 3-phase in a triangle is 3-phase 400V?
• #5
Anonymous
Anonymous
• #6
Szaruś
Level 12
My house connection has 3 phases (400 V between phases, 230 V between phase and "neutral"). Can I connect devices powered by point 2 or 3 to it?
• #7
Anonymous
Anonymous
• #8
thalex
Level 16
Szaruś wrote:
What is the difference between 220V three-phase power and 380V three-phase power supply? Many manufacturers report that they have 3-phase products for these voltages. E.g. inverters 200 to 230VAC 1/3 phase or 380 to 460 VAC 3 phase power supply, etc.

As far as I know, the voltage between phase and "zero" is 220-230V, and between phases is 380-400V.

Our networks have a voltage of 3x400V
This means that the phase-to-phase voltage is 400V and the voltage between phase and neutral (N) is 230V

There are networks with 3x220V and then the phase-to-phase voltage is 220V and the voltage between phase and zero is 127V.

An example would be the engine it writes on;
3x230 - triangle
3x400 - a star
Means that the motor can work in a 3x230V network connected in delta
and in the 3x400V network connected in a star
(i.e. such a motor cannot be delta connected in our network, in our delta network a delta and star connected motor could work, but on it it must write 3x400V triangle / 3x660V star, for these motors, star / delta switches are used in our networks.

If we use a 230V single-phase inverter and a typical 3x230V triangle / 2x400V star motor, the motor must be switched to work with such a triangle inverter.
These inscriptions on electric receivers define the types of networks in which these receivers can work

Szaruś I have briefly described the issue, but I will be happy to answer other similar questions here and there too :wink:

Please note that the previous statements contain a lot of mistakes!
• #9
Anonymous
Anonymous
• #10
Szaruś
Level 12
It's just to put it in order.

Here is an example of one manufacturer's data plate:

So, if I understand correctly, those with a 380-460 V 3-phase power supply and a 200-230 V single-phase supply are suitable for Polish conditions. So, for example, the model 1305-AA02A is not suitable, but the AA03A model is single-phase). And all "BA" models are OK?
• #11
Anonymous
Anonymous
• #12
Level 15
Hello. I would like to draw my colleague's attention to a certain irregularity presented by "Geguś". The inverter power supply does not necessarily determine what we get at the output . I have inverters powered by 1-phase 230V and it is possible to set the output voltage . therefore delta- or star-connected motors can be connected to them . Supply quantities are a separate matter .. but I can see that you are clear on this matter
• #13
Anonymous
Anonymous
• #14
thalex
Level 16
geguś wrote:
Hello
if any statements contain errors, they should be corrected - no matter who wrote them

forgive goose but I would have to correct every post of yours.
genguś wrote:
True, all AA series 3-phase models are not suitable for our network, unless I use a transformer or autotransformer to lower the voltage

all inverters in the table are suitable for our networks. The choice depends on the engine at our disposal.
genguś wrote:
there are also circuits which, instead of 3x230V (phase-to-phase), can be powered from one phase -230V, but then you will only get the output
110V (phase-to-phase)

Where do the 110V come from :?:

geguś wrote:
3. there are 3-phase inverters, i.e. phase-to-phase 230V

But perhaps on one winding of the star-connected motor coil?

ps. I will not mention that you do not write anything whether you need to switch the motor in a triangle with a single-phase inverter
but it is finally a discussion forum; so I will not be allowed to contribute to the discussion.
• #15
thalex
Level 16
Szaruś wrote:
It's just to put it in order.

Here is an example of one manufacturer's data plate: ........

All inverters in this table are suitable for our networks. The choice depends on the engine you have. A problem is created if you have one single phase inverter and a three-phase motor (low power) and there is no all the ends removed coils, which makes it impossible to switch it for delta operation.

The selection of the inverter should be started with the motor you have.
• #16
_Tomaszz
Level 16
I agree with Thalex's post above!

As for the table - AA series converters can be connected to a 230V three-phase network (not with us) or to one 230V phase - at the output of the device you will get 3x230V phase-to-phase,
we connect the BA series only to the 3x400V network, obtaining 3x400V at the output.

Supporting my colleague Thalex, I will write to tell you what type of motor you have (if you have one) and how you can power the converter (single-phase or three-phase).
• #17
Anonymous
Anonymous
• #18
thalex
Level 16
Hello everyone, especially Szarusia
HHAAALLLLOOO Szaruś are you satisfied with the answer ?????

Regarding the table; I think it is not exact because it is not written how many phase the power supply is, I would bet (when it comes to 200-230) that such an inverter is intended for one phase, e.g. 230V, so it fits our network.

Thanks other plate for support.

Sorry Dude but the red square (I mean your square) obliges you to do something.
• #19
Szaruś
Level 12
I was gone for a few days, and here I can see a discussion broke out.

And I do not have the engine yet (but I will), I just wanted to get an idea of the topic.

Thanks for the replies, now (I guess ) lightened up a bit.
• #20
krzysiek-ii
Level 12
if you want to know more about inverters and their power supplies, go to: www.schneider-electric.pl
• #21
ln
Level 11
And I have such a problem.
I have a device with a built-in Tamela 380V motor and three wires coming out. I do not have access to this box as it is in ordinary engines. The motor is probably connected with a star because the sign is marked with a Y sign (upside down), other parameters 0.8kW, stand. 380V 2.2A Cos? 0.74 1400rpm.
The device works nicely in three phases, and I would like to fire it in an apartment where there is one. It is a grinder, it is important to keep the rotation and the right torque (hence the three phases).
The question is whether it can be done somehow with capacitors so that it can be done on one phase. Replacing the motor is absolutely not an option, it is impossible / unprofitable - the motor is built into the body of the device.
If the inverter is OK, but I read some of the previous posts and I don't understand anything except that it would require a delta connection of the motor, and I can't do anything but these three wires, because there's nothing inside except the hole from which they come out.
In addition, on the Allegro I met mainly with inverters described in this way: input 230V, output 0-input or the same but input 380V.
I need something that will convert one 230V phase to three 380V shifted accordingly.
• #22
atlantel
Automation specialist
Hello!
Do you have access to a current clamp and voltage meter, if you have an electrician or a friend who would measure the mains voltage and current consumed during normal operation of the grinder, I will answer you - is it possible to use an inverter? Using a 3-phase motor as a single-phase in your device is rather hardly possible due to the drastic reduction in power.
greetings
• #23
Krzysiek.UK
Level 10
Hello, I can see that this topic is probably related to my problem, so I got a pressure washer and it requires a socket that, as far as I know, has 400v, unfortunately I do not have one in my house, is there any possibility to run it without such a socket?
• #24
krzysiek-ii
Level 12
From the inverter 1phase - the motor must be in the triangle between the wired 230v from one phase you will not do 400v