Ib running current

[marcus10]

Hey if a motor is rated at 0.37kW and will be run in delta. and the power factor is 0.65 at a voltage of 400v in 3 phase how do you work out the running current.

is it 0.37/400??

 

[scotsparky]

marcus is this homework for college?

If it is i am not telling the answer but rememeber the load current your after is the load per phase not total.

 

[Sparky Ninja]

Hey if a motor is rated at 0.37kW and will be run in delta. and the power factor is 0.65 at a voltage of 400v in 3 phase how do you work out the running current.

is it 0.37/400??

Remember when working out design current for 3phase the formula changes to Ib=P/(√3XUL) plus the factor needs to applied in the formula.

 

[telectrix]

I = watts/( root3x V ). then divide by PF. think that right without looking it up.

 

[scotsparky]

Kw X1000/ root3 x Uo x pf

 

[marcus10]

what does the abreitation Uo mean please?

 

[scotsparky]

Uo is voltage its in the deffinitions section of the regs

 

[telectrix]

when we used to use english terms we would use V, not U. but according to europe, V for Volt is illogical.

 

[scotsparky]

telectrix i know and i am with you however if its homework as i suspect its best to use the correct symbols

 

[mayfair]

what the T do you know anyway

when we used to use english terms we would use V, not U. but according to europe, V for Volt is illogical.

 

[Sparky Ninja]

what does the abreitation Uo mean please?

Uo is the line voltage to earth.

However that is incorrect for your scenario.

You want UL, as it is given in syllabus, or U, as it is defined in BS7671. This is for the voltage between lines (i.e. 400v). Use it as I wrote it down earlier.

 

[mayfair]

And there you have it ...........no messing around just the advice you asked for nothing more nothing less.

Uo is the line voltage to earth.

However that is incorrect for your scenario.

You want UL, as it is given in syllabus, or U, as it is defined in BS7671. This is for the voltage between lines (i.e. 400v). Use it as I wrote it down earlier.

 

[Sparky Ninja]

And there you have it ...........no messing around just the advice you asked for nothing more nothing less.

oh I dunno about that...

here's a picture of a puppy.

View attachment 6220

 

[mayfair]

Thats cheating the baby was yours that puppy could be anyones . I dont believe your daft enough to have a new baby and a new puppy the formula for that is 2 X P = a lot of P which if squared is a > S where P = poo and S = smell

oh I dunno about that...

here's a picture of a puppy.

View attachment 6220

 

[Knobhead]

I=(((KW*1000)/3)/(VΔ/√3))/Cosθ