Hi,
I've just got into my electrical engineering course and I need some help with a question of mine here.
During a site visit, we were shown a main LT panel which has switchgears, ammeters and different kinds of relays and the distribution network from that panel. In the main LT panel I've noted down the current readings as Ir - 163A, Iy - 150A and Ib - 147A. The Line to Line voltage is 415 V at 50 Hz and Line to Neutral voltage is 230V at 50 Hz.
From the above details, how would I calculate the kVA rating of transformer? The primary side voltage of the transformer is 11 kV and the secondary side voltage is 415V and the frequency is 50 Hz.
- 2 Answers
- 3135 Views
- I also Faced
- E-Mail Answers
Answer Posted / 7anoter4
The transformer actual load [apparent power] S=0.23*
(163+150+147)=105.8 kVA.
You may calculate approximately taken the average current
(163+150+147)/3=153.33 A and the formula sqr(3)
*0.415*153.33=110.2 kVA [4% error].
But this is not the rated power. The rated power and the
rated current have to be written on manufacturer rating
plates.
| Is This Answer Correct ? | 0 Yes | 1 No |
Post New Answer View All Answers
what is KA rating and how can we choose switchgears on applications
What will happened if the neutral of the (star connected secondry) Xformer disconnected? (if its Above KVA rated one)
Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . y d.c series motor in train.train wheels r driven by D.C shunt motor ,at what voltage,and at what speed. please reply..............
What is the technical difference between On delay timer and a Star delta timer?
Enlist four components of electrive drives.
what is the transformer turn ratio formula and give some examples?
mccb service sittings be done?
As we use capacitor bank in 3ph ckt to improve PF, can we use capacitor in single ph domestric use, in house we have Fan,Mixer,electric cooker,iron,tube choke they also lag the system,because it is inductive load. if it is possible to improve PF of single ph system-- if yes- type of capacitor to be used,connection diagram, working in detail. if no-- list it.
Can anyone please provide me details of MCCB/Contactor/SFU rating calculations for a motor feeder..for example 50 kw.. not from type-2 cordination chart. i want manual calculations..
what is the relation between reactive power and power factor for the what is the limit of reactive power and power factor
List examples of current sources?
What is the basic principle of welding process?
ho can we calculate the conductor insulation value according to their ratings like voltage,current etc.how insulation value related with voltage,current and power of amachine
sir i ve applied for hindustan petroleum and power grid india ltd..and the exams on feb 22.can you pls send model papers and tell how to prepare for those.i need to get into any of these for sure.....
WHAT IS IEC? & WHAT IS BENEFIT TO PRODUCT FROM IEC?
