Transformer Test Report
Product Model:
3150kVA/34.5kV
Product No:
Test conclusion:
Test date:
Inspector:
SUNGROW POWER SUPPLY Co.,Ltd
Confidential
1 Description
Name of Product
Type of Product
Serial No.
Drawing No.
2 Technical Specification
Power Rating
3.15 MVA
Cooling Type
KNAN
Rated Voltage
(34.5±2×2.5%)/0.63 kV
Number of Phases
3 Phases
Rated Current
52.7/2887A
Rated Frequency
60Hz
Vector Group
Dy1
3 Applicable Standards
ANSI/IEEE C57.12.00
ANSI/IEEE C57.12.90
ANSI/IEEE C57.12.80
ANSI/IEEE C57.100
ANSI/IEEE C57.136
ASTM D 6871
AWS
NEMA
NFPA
SSPC
General Requirements for Liquid-Immersed Distribution, Power and Regulating Transformer
Test Code for Liquid-Immersed Distribution, Power and Regulating Transformers
Standard Terminology for Power and Distribution Transformers
IEEE Standard Test Procedure for Thermal Evaluation of Liquid-Immersed Distribution and
Power Transformers
IEEE Guide For Sound Level Abatement & Determination For Liquid-Immersed Power
Transformer & Shunt Reactors Rated Over 500 KVA
Standard Specification for Natural (Vegetable Oil) Ester Fluids Used in Electrical Apparatus
American Welding Society
National Electrical Manufacturers Association
TO National Fire Protection Association National Electrical Code
The Society for Protective Coatings Paint Application Specification NO.2
4 Test Items and Test Results
TEST ITEMS
Acceptance Criteria
Test Result
34.5kV/0.63kV, Dy1, Error Tolerance shall be ≤±0.5%
Measurement of
4.1
voltage ratio and
check of phase
displacement
Tap Position
HV (V)
LV (V)
A
36225
57.50
B
35363
56.13
C
34500
D
33638
53.39
E
32775
52.02
630
Nominal
A
B
54.76
HV Winding (Ω)
Measurement of
4.2
Tap Position
winding
A
resistance
B
C
H1-H2
H2-H3
H3-H1
C
Confidential
D
E
LV Winding (Ω)
Tap Position
X1-X2
X2-X3
X3-X1
/
4.3
Measure of
Measured
insulation
Between
windings
4.5
Voltage (V)
R15
2500
Measured Between
Test Voltage (kV)
Test Frequency (HZ)
Duration (s)
HV
50
60
60
LV
10
60
60
test
Induced voltage
withstand test
Tap
Test
Supplied
short-circuit
Supplied
C
HV
LV
4.10
7200
Test Current (%)
No-load Loss (W)
Required
Measured
Required
≤0.5
Test Voltage
Test Current
(V)
(V)
Measured
≤4450+8%
Impedance (%)
Required
Measured
5.75±7.5%
Load loss (W)
Required
Measured
≤27500
Tank pressure
Applied Pressure (MPa)
Duration of Test (h)
(leakage) test
0.04
6
Lightning impulse
HV Test Voltage
150kV
test
LV Test Voltage
30KV
Paint film
thickness test
insulation oil
(Optional)
Measure of
4.12
Duration(cycles)
Test Voltage (V)
impedance and
Testing of
4.11
Induced
1260
load loss
4.9
Induced
Position Winding Terminal Voltage(V) Voltage (kV) Multiple
no-load current
Measurement of
4.8
R60/R15
LV~HV & Earth
and no-load loss
4.7
R60
HV~LV & Earth
Applied voltage
Measurement of
4.6
Absorptance
resistance to
earth of the
4.4
Insulation Resistance (MΩ)
Breakdown voltage
(kV)
≥45
Measured Between
capacitance and
dissipation loss
HV~LV & Earth
factor (Optional)
LV~HV & Earth
Water content (ppm)
≤200
Dielectric Loss
Factor tgδ (%)
Dielectric dissipation
Dissolved gas
factor @100℃(%)
analysis
≤4
Capacitance Cx (pF)
Voltage (kV)
Confidential
HV/LV~Earth
Average
Measurement of
4.13
sound levels
(Type Test)
4.14
4.15
Lightning Impulse
Test (Type Test)
Temperature Rise
Test (Type Test)
Noise Level
of Trans.
Average
Noise Level
Backgroun
Difference
d Noise
Level
Background
Noise Level A Surface A Sounding
Between Trans. Modification
And Background
Noise
Power Level
(X)
Tap Positon
Full Wave
Chopped Wave
HV Test Voltage
150kV
165kV
LV Test Voltage
30KV
33kV
Top Oil Temp. Rise
Required Value (K)
Actual Measured Value (K)
Average Oil Temp. Rise
≤65
HV Winding Temp. Rise
≤65
LV Winding Temp. Rise
≤65