# Re: CALCULATION OF KVA RATING OF WELDING T/F WITHOUT NAME PLATE

Home Electrical Engineering Forum General Discussion CALCULATION OF KVA RATING OF WELDING T/F WITHOUT NAME PLATE Re: CALCULATION OF KVA RATING OF WELDING T/F WITHOUT NAME PLATE

#12237

Sunny Boy said:

Hi

If there is a transformer in your welding machine you may calculate transformers power. I found one very approximate equation for calculating real power of a transformer.

P=A*A, where A is cross section of transformers core.

I usually test capacitors with current clamps. I use Fluke 345 which can actually measure the amount of active and reactive power consumed by a capacitor. You can compare measured data with data on capacitors nameplate.

If you have ordinary clamp meter you may assume that all current is reactive. With use of reactive current, voltage and nominal capacity you can calculate actual reactive power of capacitor. But note that capacitors power is proportional to voltage squared (U*U).

I hope that this information is useful.

Best regards,

Miha

G S DAS said:

DEAR ENGINEERS

CAN YOU GIVE ME A SUITABLE WAY TO CALCULATE THE KVA RATING OF A WELDING MACHINE HAVING NO NAME PLATE

ALSO HOW CAN WE UNDERSTAND THE CAPACITOR CONNECTED IN COMBINATION WITH A POWER EQUIPEMENT IS PROPERLY WORKING?

Measure the current and voltage.

kVA = volts x amps. 1-phase

kVA = 1.732 x volts x amps – 3-phase