Shanghai Changji Electric Co., Ltd. is a professional enterprise specializing in the production of various reactors, power transformers, dry-type transformers, amorphous alloy transformers, special transformers, and box-type substations.
Equipped with modern production facilities, advanced manufacturing processes, and comprehensive testing equipment, the company ensures the production of high-performance products featuring innovative designs, low losses, low temperature rise, low noise, high impact resistance, and strong short-circuit withstand capability
Core Products:
- 10kV, 20kV, and 35kV dry-type and oil-immersed reactors
- 10kV, 20kV, and 35kV oil-immersed transformers
- 10kV, 20kV, and 35kV vacuum epoxy-cast dry-type transformers
- 10kV, 20kV, and 35kV non-encapsulated (SG) vacuum pressure-impregnated dry-type transformers
- Box-type substations
Additionally, the company can design and manufacture various special transformers according to customer requirements.
For years, the company has adhered to a customer-first philosophy, earning trust and support through a strong commitment to product quality. By continuously improving quality management and pursuing excellence, Zhejiang Changji Electric Co., Ltd. strives to secure its market position. With full enthusiasm, sincere cooperation, and a win-win business approach, we warmly welcome domestic and international customers to visit, inquire, and discuss potential collaborations!
4500KVA 34.5KV/0.415KV pad mounted transformerTechincal data sheet
1,Technical specification
Type :ZGS-H-34.5/0.415-4500 Serial No 202405001
Power Rating :4500 kVA Rated Current:75.31/6260.6A
Rated Frequency:60Hz Rated Voltage:34.5/0.415kV
Number of phases:3 Vector Group:Dyn1
Cooling Type:ONAN
Two:Items and results of tests
2,Measurement of voltage ratio and check of vector group
| HV Windings |
LV Windings |
Calculated
Rotio |
Error |
| Tap |
Voltage(V) |
AB/ab |
BC/bc |
CA/ca |
| 1 |
36225 |
|
87.29 |
0.03 |
0.01 |
0.04 |
| 2 |
35363 |
|
85.21 |
0.04 |
-0.02 |
0.02 |
| 3 |
34500 |
415 |
83.13 |
0.02 |
0.03 |
0.03 |
| 4 |
33638 |
|
81.06 |
-0.02 |
0.01 |
0.02 |
| 5 |
32775 |
|
78.98 |
-0.02 |
0.01 |
0.02 |
| 6 |
|
|
|
|
|
|
| 7 |
|
|
|
|
|
|
| 8 |
|
|
|
|
|
|
| 9 |
|
|
|
|
|
|
Check lf Vector Group:Dyn1
3,Measurement of insulation resistance Relative Humidity Temperature Temperature: 27 ºC
| Insulation Resistance |
Measurement Between |
Voltage |
| H.V.-L.V.&Earth |
L.V.-H.V.&Earth |
H.V,L.V.&Earth |
| R60 |
2500 |
2500 |
2500 |
2500V |
4,Measurement of winding resistance Temperature 27 ºC
| Windings |
Tap Position |
Resistance |
(%)Unbalance Rate |
| AB(Ω) |
BC(Ω) |
CA(Ω) |
| H.V. |
1 |
1.629 |
1.636 |
1.631 |
<2 |
| 2 |
1.589 |
1.595 |
1.560 |
<2 |
| 3 |
1.552 |
1.559 |
1.555 |
<2 |
| 4 |
1.510 |
1.518 |
1.512 |
<2 |
| 5 |
1.476 |
1.482 |
1.478 |
<2 |
| 6 |
|
|
|
|
| 7 |
|
|
|
|
| 8 |
|
|
|
|
| 9 |
|
|
|
|
| L.V. |
/ |
X1X2(Ω) |
X2X3(Ω) |
X3X1(Ω) |
|
| / |
0.0002245 |
0.0002264 |
0.0002272 |
<2 |
5,Measurement of on-load current and losses
| Test Voltage |
No-load Loss(W) |
Test Current |
| Io(A) |
Io(%) |
| Un |
4437 |
/ |
0.32 |
6,Measurement of short-circuit impedance and load losses
Reference Temp. (ºC)
|
Base Power
(kVA)
|
Impedance
(%)
|
Load Loss
(W)
|
| 75 |
4500
|
6.38 |
34087 |
7,Applied voltage test
| Measured Between |
Test frequency
(Hz)
|
Test Voltage
(kV)
|
Duration
(S)
|
| H.V.ToL.V.&Ground |
50 |
70 |
60 |
| L.V.ToH.V.&Ground |
50 |
5 |
60 |
8,Induced voltage test
Applied 200% rated voltage for L.V.,frequency is 150Hz,during fot 30s
9,Oil change master
| Oil No. |
Breakdown voltage |
| 25 |
40kV/2.5mm |
|
Shanghai Changji Electric Co., Ltd. is a professional enterprise specializing in the production of various reactors, power transformers, dry-type transformers, amorphous alloy transformers, special transformers, and box-type substations.
For years, the company has adhered to a customer-first philosophy, earning trust and support through a strong commitment to product quality. By continuously improving quality management and pursuing excellence, Zhejiang Changji Electric Co., Ltd. Strives to secure its market position. With full enthusiasm, sincere cooperation, and a win-win business approach, we warmly welcome domestic and international customers to visit, inquire, and discuss potential collaborations!
Equipped with modern production facilities, advanced manufacturing processes, and comprehensive testing equipment, the company ensures the production of high-performance products featuring innovative designs, low losses, low temperature rise, low noise, high impact resistance, and strong short-circuit withstand capability.
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