1000 kVA Three Phase Substation Transformer
Primary Voltage: 10KV
Secondary Voltage: 0.4KV
Power Rating: 1000 KVA
Connection Type: Dyn11/Yyno or others
Transformer Type: Power Substation Transformer
Standards: ANSI/IEEE, CSA/CAN, DOE
Certificate: UL, CE
Model interpretation
Meaning of S-1000:
- S: three-phase oil-immersed transformer
- 1000: rated capacity 1000 kVA
Common complete model such as S-M-1000/10, where “M” indicates fully sealed structure, and “10” indicates rated high-voltage side voltage of 10 kV.
Core technical parameters
| Item | Parameter |
| Rated capacity | 1000 kVA |
| High-voltage side voltage | 10 kV |
| Low-voltage side voltage | 0.4 kV |
| Phase number | Three-phase |
| Frequency | 50 Hz |
| Connection group | Dyn11 / Yyn0 |
| Tap changing method | No-load tap changing |
| Tap range | ±5% or ±2×2.5% |
| Cooling method | ONAN (oil-immersed self-cooling) |
| Core material | Cold-rolled grain-oriented silicon steel sheet |
Loss parameters (key energy-saving indicators)
| Item | Value |
| No-load loss | 745 W |
| Load loss (75℃) | 8240 W |
| No-load current | 0.7%–1.0% |
| Short-circuit impedance | 4.5% |
Performance advantages
Fully Sealed Structure
Adopts corrugated oil tank fully sealed design. Oil is isolated from air, effectively preventing insulation oil aging and moisture ingress. It is suitable for outdoor environments such as wind and rain, especially for remote mountainous areas and rural power grid renovation.
Low-Noise Operation
By optimizing core structure and manufacturing process, the noise level is controlled at around 58 dB, suitable for noise-sensitive application scenarios.
High Reliability
Built-in safety protection devices such as pressure relief valve, signal thermometer, and gas relay ensure safe operation. The oil tank surface is treated with degreasing, rust removal, and phosphating, then coated with anti-corrosion paint (rainproof, moisture-proof, salt-spray resistant), meeting special requirements of metallurgical and petrochemical humid and polluted environments.
Application scenarios
Industrial Sector
Factories, mines, chemical production lines for 10 kV/0.4 kV voltage conversion.
Power System
Rural grid reconstruction, urban distribution networks.
Commercial Buildings
Large shopping malls, hospitals, schools and other public facilities.
New Energy Supporting Systems
Photovoltaic booster stations, charging pile power supply systems.
Daily Maintenance
| Item | Frequency | Details |
| Oil temperature monitoring | Daily | The upper oil temperature should not exceed 85℃. |
| Oil level inspection | Weekly | The oil level should be within the normal range of the oil level indicator, and there should be no oil leakage at any part. The bushing oil level should be normal, and the exterior of the bushing should have no damage or cracks, no serious oil contamination, no discharge traces, and no other abnormalities. |
| Sound monitoring | Daily |
The normal sound is a uniform “humming” sound, and abnormalities should be checked: 1. When there is a “ding-dang” sound inside the transformer, it may be caused by loose core clamping bolts or some internal parts or leads being loose. 2. When there is a “gurgling” sound inside the transformer like boiling water, there may be an inter-turn short circuit fault. |
| Appearance inspection | Monthly |
Check oil leakage, bushing cleanliness, and breather silica gel condition: 1. No oil leakage at any part. 2. The outer surface of the bushing and the inner wall of the conductive tube should be clean, the oil level should be normal, and there should be no oil leakage, cracks, damage, or discharge traces. 3. In order to show the moisture condition of the silica gel, color-changing silica gel is generally used. When the silica gel absorbs moisture and becomes ineffective, it changes from blue to pink. At this time, it can be replaced with new silica gel, or the ineffective silica gel can be dried and changed from pink back to blue for continued use. |
| Oil quality test | Yearly |
Test breakdown voltage, dielectric loss, and moisture content: 1. During operation and maintenance, when it is found that the moisture content in the oil is too high, it is best to drain the transformer oil, properly dry the winding body and other parts, and then inject treated oil. |
| Insulation resistance | Every six months | Measure with a 2500V megohmmeter. |
Selection Recommendations
When selecting an S-1000 oil-immersed transformer, it is recommended to confirm:
- Voltage level: whether the high-voltage side is 10kV (other specifications such as 6.3kV are also available)
- Vector group: Dyn11 has better harmonic suppression capability and single-phase ground fault withstand capability
- Operating environment: altitude not exceeding 1000m, ambient temperature -25℃~+40℃
