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Testing Transformer

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Specification: S=110VA (ตามข้อมูลการออกแบบ)
Vprimary = 110 V ,Vsecondary = 110 V
ค่ากระแสเต็มพิกัด Ipri(Rated)=1 A , Isec(Rated)=1 A

Insulating Resistance
RPrimary=0 Ω                            RSecondary=0 Ω

RPrimary to Core>2000M Ω                 RSecondary to Core>2000M  Ω

RPrimary to Secondary>2000M  Ω

Transformation Ratio
VPrimary
0
20
40
60
80
100
120
VSecondary
0
19.92
39.65
60.4
80.5
100.5
119.8
Transformation Ratio
-
1.004
1.008
0.993
0.993
0.995
1.001

VSecondary
0
20
40
60
80
100
120
VPrimary
0
20.02
40.04
60.5
79.7
100
118.9
Transformation Ratio
-
0.990
0.999
0.991
1.003
1
1.009

Approximated Equivalent Circuit

WattVoltAmpPFNote
Open Circuit Test10.25W110V0.185A0.5O/C Secondary Side
Short Circuit Test7.5W6.99V1.1075 A0.99S/C Secondary Side

Rp=P/I2sc=7.5/(1.1075)2=6.114Ω
Xp=(Z2sc-R2p)^1/2=(6.31152-6.1142)^1/2=1.5665Ω ;Zsc=Vsc/Isc                
Rc=Vo/Io(cosѳ)=110/(0.185x0.5)=1189.189Ω         
Xm=Vo/Iosinѳ=110/(0.185x0.866)=686.598Ω

Load Test(Constant Input Voltage)

Lamp
Primary
Secondary
(W1 - W2) 
W1
V1
A1
PF1
W2
V2
A2
PF2
Losses
0
9.667
110
0.1767
0.49
0.000
110
0.000
-
9.667
1
44.000
110
0.4300
0.93
34.333
108
0.320
1
9.667
2
76.000
110
0.7067
0.97
63.667
106
0.600
1
12.333
3
95.000
110
0.8800
0.98
81.000
104.9
0.773
1
14.000
4
108.000
110
0.9967
0.99
93.333
104.7
0.893
1
14.667

At Full Load Condition  h:  =    86.42 %     Losses =   14.667 W
S1 =   109.637  VA   S2  =  93.49 VA       Voltage Regulation =  5.06%

Polaritr Test
V12=110 V , V34=110.2 V,  V13=220 V

Voltage Tapping(Constant Input Voltage)
 

Designed
Measured
Error

 
Winding
Designed
Calculated
Voltage
Value

 
(Turns)
Volt/Turn
Volt/Turn
110
110.3
0.3

 
350 
0.31449
0.31514
107
107.1
0.1

 
340 
0.31449
0.315
101
101.1
0.1

 
321
0.31449
0.31495
98 
98.3
0.3

 
312
0.31449
0.31506
86
86.2
0.2

 
274
0.31449
0.31459

 

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