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