Sheet1VICTORY TRANSFORMERS &SWITCHGEARS LTD3Phase
transformer calculation3-Q TRANSFORMER CALCULATION SHEETTransformer
sl.no19602T/F SL.NO19602Kva rating16000VAKVA rating of
Transformer16Kvaprimary voltage11000VoltsPrimary
voltage11000voltsSecondry voltage433VoltsSecondary
voltage433voltsNoload losses and current72wattsNo load
losses72wattsFull load losses394WattsNo load current0.59ampsNo load
current0.59ampsfull load losses394wattsImpedance
voltage480VoltsImpedance voltage480voltsLv Avg
resistance219.16m.OhmsL v resistance in milli ohms219.16m ohmsHv
Avg resistance215.33OhmsHv resistance in ohms215.33ohmsAmb
temparature30Deg cAmb temperature30deg cHv rated
current0.8398068444AmpsFull load current In hv side0.84ampsLv rated
current21.3345849623AmpsLv full load current21.33ampsHV I2 R
losses227.8004717324WattsHV I2R losses = IR x1.5 =227.80wattsLV I2R
losses149.6307828302WattsLv IR losses = IR x .5x3
=149.63wattsIRLOSSES CALCULATIONTotal I2R losses@amb
temp377.4312545625Wattstotal I R lossses @ Amb temp = Hv losses+ Lv
losses=377.43wattsstray loses@ Amb temp16.5687454375Wattsstray
losses @ Amb temp =Measured losses -I R losses =16.57wattsl I2R
losses@75 temp441.5233543939WattsI R lossses @75 c temp = ((225+75)
x losses) / (225+ Amb temp)=441.52wattsstray loses@75
temp14.1636049707Wattsstray losses @ 75 c temp =((225+Amb
temp)(Stray losses at amb))/30014.16wattstotal full load
[email protected] full load losses at @75 c = IR
losses at 75 c+Stray losses at 75 c=455.69wattsImpedavce @ Amb
temp989.94192OhmsImpedance at amb temp =(Imp voltage x1.732)/Full
load current=989.94ohmsTotal Resistance @ Amb temp
=535.1543266805OhmsTotal resistance at amb temp =IR losses/
I=535.15ohmsReactance832.8234216258OhmsReactance =SQRT(Impedance
--Resistance )832.82ohmsResistance @ 75 temp
=626.0295897017OhmsResistancd at@ 75 c =(300 x resistance at amb )
/(225+Amb temp)626.03ohmsImpedance @ 75 temp
=1041.8771034966OhmsImpedance at 75 c =SQRT(R at 75 +
X)=1041.88ohmsPercentage impedance4.59%percentage impedance =(Z at
75 c x I x 100)/V14.48%Percentage resistance2.76%percentage
resistance =( R 75 c x I x 100)/V12.76%Percentage
reacrance3.67%percentage reactance =(X x I x 100)/V13.67%regulation
@upf2.76%regulation @upf =(%R cos+%Xsin)2.76regulation @ 0 .8
pf4.43%regulation @ 0 .8 pf =(%R cos+%Xsin)+1/200(%R
sin-%Xcos)24.43Efficiency at upfEfficiency at upf125%96.80%at125%
=(Kva x 1.25 x 100)/((kva x 1.25)+(IR losses x
1.25)+(NLL))96.80%100%97.27%at100% =(Kva x 100)/(kva +(IR losses
)+(NLL))97.27%75%97.69%at75% =(Kva x .75 x 100)/((kva x .75)+(IR
losses x .75)+(NLL))97.69%at 50%97.96%at 50% =(Kva x.5 x 100)/((kva
x .5)+(IR losses x .5)+(NLL))97.96%at25%97.67%at25% =(Kva x .25 x
100)/((kva x .25)+(IR losses x .25)+(NLL))97.67%Efficiency at .8
pfEfficiency at .8 pfat 125%99.52%at125% =(Kva x 1.25x.8 x
100)/((kva x.8x 1.25)+(IR losses x 1.25)+(NLL))99.52%at
100%96.61%at100% =(Kva x.8x 100)/(kva x.8 +(IR losses
)+(NLL))96.61%at 75%97.12%at75% =(Kva x .75 x.8x 100)/((kvax.8 x
.75)+(IR losses x .75)+(NLL))97.12%at 50%97.47%at 50% =(Kvax.8 x.5
x 100)/((kvax.8 x .5)+(IR losses x .5)+(NLL))97.47%at
25%97.10%at25% =(Kvax.8 x .25 x 100)/((kvax.8 x .25)+(IR losses x
.25)+(NLL))97.10%
