how is efficincy of the transformer is predermined
Answers were Sorted based on User's Feedback
Answer / parth belani
The efficiency can be found by finding the losses. because,
efficiency= output/input = output/(output+losses)
Now there are mainly two types of losses in a transformer.
1) Iron losses which can be found by the "No load" test.
2) Copper losses which can be found by the "Full load"
or "Short Circuit" test.
by knowing the losses, and the output rating of the
transformer, we can find efficiency.
Is This Answer Correct ? | 8 Yes | 0 No |
Answer / sunil kumar
The efficiency of transformer can be predetermined by open
circuit and short circuit test.in case of open circuit test
the high voltage side is kept open and rated low voltage is
applied to the primary(for ex:25mva,230(p)/115(s),230 kept
open and115v applied to secondary winding and the
wattmeter accounts for iron losses.in case of shortciruit
test the lv winding is shorted and the hv winding is
energised because in order to limit current drawn from the
source and the wattmeter accounts for full load copper
losses.in addition to above tests sumpners test or back to
backtest is most accurate where two identical transformers
are loaded simultaneously it gives the actual temp rise in
the transformers wherwe as oc and sc tests can't.
Is This Answer Correct ? | 2 Yes | 5 No |
WHAT IS MODULATION AND NEED FOR MODULATION ?
Which types of following motors are most efficient?
load increase means 1 resistance increase 2 load resistance decrease 3 current increases through load 4 none of these
1 unit or 1 kwh means how much kva
Define steady state error.
If we have to find the inductance of a dc shunt motor then by giving dc supply or ac supply and what is the reason for it. (this example is from "to determine the transfer function of a dc shunt motor ")
how capacitance is neglected in short transmission lines ?
WHAT IS THE PARTIAL DISCHARGE TEST?
What is the difference between EARTH & NEUTRAL?
Find the netid and hostid for the following classful IP addresses? i) 117.34.3.8 ii) 132.57.8.6 iii) 207.3.54.12
can we use the step down transformer to step up transformer
what are the types of control systems to control the speed of the motor??