why transformer are rated in kva.

Answer Posted / prasanth p.s

copper loss depend on current and core loss depend on voltage
there for total loss depend on voltage and current not on powerfactor .in other equpment like motor total loss depend on
powerfactor ie kw=(v*i*pf)/1000 .there for motor rated in kW.but tranformer rated in kVA because kVA=(v*i)/1000

Is This Answer Correct ?    1 Yes 0 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

How isolater function when installed inelectrical 440V wiring

1694


Explain with example of functional requirements of protection relay in terms reliability, selectivity, sensitivity

1376


What are the different circuits in thermal power plant?

707


Comparision of Air break circuit breaker, SF6 Circuit breaker and vacuum circuit breaker.

1919


Define the term factor of inertia.

1440






Different STANDARDS (BS, IS, IEC etc) gives different informations on CT specification. How they correspons w r t each other (i.e I mean to say BS provides "knee point voltage" but IS does not, then how can i select CT)

1497


HOW WE KNOW IN PHYSICALLY THE CONTACT SURFACE OF A VACUUM INTERRUPTER IS GOOD OR GOING TO DAMAGE IN A VCB AFTER ABOVE 500 TIMES OPERATED.

1636


Mention the difference between Analogue and Digital circuit?

674


During FEED, you will have all the information with regards to cable. How will you calculate the MTO for MV and LV Cables? what are your considerations?

2022


we have consol make 3 phase servo stabilizer for cnc m/c. while installing the earth neutral voltage is 1.7 volts at stbilizer off condition and when stabilizer get on en voltage reaches 4.8 volts (new earthing is done and neutral is helthy condition all phase to neutral volts 440,442,441 v)why this happen.solution for cause.

5543


We need to current density & short circuit calculation at 65kA for aluminium & copper busbar.

1238


describe the A.C. Generator Testing procedure

1638


Difference between low impedance and high impedance Restricted Earth Fault

2620


how to choose cable size with respect to load? how to convert cable size in mm2 to sq.mm?

4806


How to calculate the multiplying factor for energy meter with ct ratio given

1535