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宁德Test Report
产品描述
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Date of testing： |
21st September, 2021 |
Ambient Temp.： |
26℃ |
NO.: 210 |
82203 |
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1 Parameter |
Model |
S11-250 /11 |
Serial Nos. |
2021 |
82203 |
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|
Capacity |
250 kVA |
Rated Frequency |
50 Hz |
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Rate V |
11000 / 700 -2425V |
Rated Current |
6.28/376.5A |
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Insul. Class |
LI 95 AC 35/AC5 |
Connection mode |
Dyn11 |
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Insul. Oil |
45# Transformer purposed oil |
Conditions |
Outdoor |
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Phase |
3 |
Cooling way |
ONAN |
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Codes of P. |
1TY.710.150 |
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| 2 Earth V. |
Tapping stage |
High Voltage V |
Other Tapping V |
Lower V |
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|
5 |
11000 |
13800±2×2.5 % |
230 |
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| 3 Insulation performance |
Resistance |
Once to ground |
Secondary to ground |
Time of the secondary and ground |
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|
МΩ |
2500 |
11000±2×2.5 % |
700-2425 |
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4 Voltage ratio &connection group label verification |
High voltage winding HV |
Low winding LV |
Measurement deviation % |
Connection group |
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Tapping stage |
Voltage kV |
Voltage kV |
AB/ab |
BC/bc |
CA/ca |
Verification |
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|
11.55 |
0.7-2.425 |
0.23 |
0.08 |
0.02 |
0.05 |
Dyn11 | |
|
11.27 |
0.08 |
0.05 |
0.04 |
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|
11 |
0.06 |
0.03 |
0.02 |
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10.72 |
0.06 |
0.06 |
0.01 |
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10.45 |
0.07 |
0.09 |
0.07 |
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5 Wire-wound resistor |
Winding Group |
Position |
Real test values |
Max. Unbalance Rate % | |||
|
AB (Ω) |
BC (Ω) |
CA (Ω) |
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High Voltage HV |
1 |
12.94 |
12.98 |
12.96 |
0.33 |
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2 |
12.63 |
12.67 |
12.65 |
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3 |
12.32 |
12.36 |
12.34 |
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4 |
12.01 |
12.05 |
12.03 |
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5 |
11.71 |
11.74 |
11.72 |
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Low Voltage LV |
Line resistance |
ab (mΩ) |
bc (mΩ) |
ca (mΩ) |
1.13 |
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|
6.094 |
6.101 |
6.163 |
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Phase resistance |
oa (mΩ) |
ob (mΩ) |
oc (mΩ) |
2.12 |
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|
3.047 |
3.053 |
3.112 |
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6 Applied voltage withstand test. |
Pressurized area |
Voltage Testing kV |
Test time S |
Conclusion |
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High voltage to ground, low voltage |
35 |
60 |
PASS |
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Low voltage to ground, high voltage |
5 |
60 |
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7 Induced Overvoltage Withstand Test |
Applied voltage kV |
Induced voltage kV |
Induction |
Frequency |
Test time |
Conclusion |
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|
LV |
HV |
Multiple |
Hz |
S |
PASS |
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0.46 |
27.6 |
2 |
150 |
40 |
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8 No load loss and no load current test |
Averaged voltage |
Effective voltage |
No-load Current % |
No-load Loss kW |
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kV |
kV |
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0.7-2.425 |
0.7-2.425 |
0.66 |
0.245 |
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9 Short circuit impedance and load loss measurement |
Winding Group |
Tapping place |
Applied Current A |
Short circuit impedance % |
No-load Loss kW |
Total Loss kW |
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|
HV-LV |
3 |
6.28 |
4.02 |
1.915 |
2.16 |
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10 Transformer oil test |
Density ≤ 0.895㎏/dm³ |
Kinematical Viscosity 50°C≤11.6 |
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Flash Point ≥140°C |
Insulating Oil Dielectric Loss ≤0.005 |
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Acid Value ≤0.01mgKOH/g |
Ash - % |
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Withstand voltage 45KV/2.5mm |
Oil number Domestic 45# type |
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11 Sealing test |
The product can endure 20 Kpa pressure for 12 hours without leakage. |
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Conclusion |
This type of power transformer has passed the test and its performance meets with the National Standards GB/T 1094.1 ~ 2-2013, GB/T 1094.3-2003, GB/T 1094.5-2008 and the technical parameters and GB/T 6451-2015 requirements. It has been checked up to the production standards and its final quality okeyed for sales, be qualified for delivery in conformity with Standards. |
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Tester：QC 4 |
Evaluation Tester：QC 2 |
Approved by：QA 1 |
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