ROUTINE TEST REPORT |
Object |
Distribution Transformer |
|
Customer นนกรุ ๊ป |
Type |
Oil Immersed |
|
Serial NO. |
-327 |
|
Rated power |
1000 |
kVA |
Work order |
|
|
Number of phases |
3 |
|
BIL (primary) |
125 |
kV(peak) |
Rated frequency |
50 |
Hz |
BIL (secondary) |
30 |
kV(peak) |
Rated primary voltage |
24000 |
Volt |
Rated primary cufrrent |
24.056 |
Amp. |
Rated secondary voltage |
416 / 240 |
Volt |
Rated secondary current |
1387.86 |
Amp. |
Tapping |
? 2*2.5% |
% |
Type of cooling |
ONAN |
|
Vector group |
Dyn 1 |
|
Test standary |
TIS 384-2543 , IEC 60076 |
|
Measurement of voltage ratio & group of connection : |
Tap Position |
1 |
2 |
3 |
4 |
5 |
Tolerance |
Standard Ratio |
- |
- |
99.93 |
97.43 |
94.93 |
? 0.5 % |
Phase A |
99.976 |
97.485 |
94.978 |
92.484 |
89.979 |
Passed |
Phase B |
99.983 |
97.488 |
94.986 |
92.483 |
90.36 |
Passed |
Phase C |
99.983 |
97.485 |
94.983 |
92.484 |
89.983 |
Passed |
Measurement of winding resistance : |
Resistance Primary (Ohm) |
Resistance Secondary (mOhm) |
Tap Position |
1 |
2 |
3 |
4 |
5 |
A - b |
B - c |
C - a |
Phase A-B |
6.22 |
6.28 |
6.03 |
5.63 |
5.50 |
1.446 |
2.366 |
2.638 |
Phase B-C |
6.20 |
5.57 |
5.41 |
5.26 |
5.14 |
Phase C-A |
6.18 |
5.59 |
5.47 |
5.34 |
5.20 |
Ambient temp. |
30.0 |
? C |
Measurement of no-load loss & Load loss |
|
Measurement of no-load loss & Load loss : |
Test result : |
No-load voltage |
416.13 |
Volt |
Load loss at 75 ?C , 100% |
12908.1 |
Watt |
No-load current |
11.892 |
Amp. |
Total losses |
14346.1 |
Watt |
No-load current |
0.857 |
% |
Impedance voltage at 75 ?C |
5.65 |
% |
No-load loss |
1438.0 |
|
Efficiency 100%,P.F.=1 |
98.586 |
% |
Test tap |
3 |
Watt |
Voltage regulation, P.F=1 |
1.442 |
% |
Load voltage |
435.3 |
Volt |
Guarantee Losse : |
Tolerance |
Load current |
7.769 |
Amp. |
No-load loss |
1950 |
Watt |
- |
Load loss at ambient temp |
1157.0 |
Watt |
Load loss |
13500 |
Watt |
- |
Ambient Temp. |
32.0 |
? C |
Impedance voltage |
6.0 |
% |
? 10 % |
Insulation resistance measurement (at 2500V) : |
Measurement of dielectric strength : (ASTM D877 Gap 2.5 mm.) |
Primary –Secondary |
8340 |
MOhm |
Oil dielectric breakdown |
55.5 |
kV |
Passed |
Primary – Earth |
7450 |
MOhm |
Oil leakage test: |
Secondary - Earth |
4960 |
MOhm |
1-5 Psi |
< 1 Hr. |
Passed |
Dielectric test : |
Separated-sourcevoltage withstand test |
Volt Test |
Frequency |
Time |
|
Primary – Secondary+Earth |
50 |
kV |
50 |
Hz |
60 |
Second |
Passed |
Secondary – Primary+Earth |
3 |
kV |
50 |
Hz |
60 |
Second |
Passed |
Induced overvoltage withstand test Secondary |
832 |
Volt |
250 |
Hz |
24 |
Second |
Passed |
|
