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Power Transformers
SINTRA is a market leader in the design, manufacture and testing of power transformers up to 150 MVA and 161 kV, for PLN, private industry and export.
- Rating
- up to 150 MVA
- Voltage
- up to 161 kV
- Cooling
- ONAN, ONAF
- Insulation
- Mineral or ester oil
- Standards
- SPLN, IEC, IEEE/ANSI
Product Range
Numerous 60 MVA and 30 MVA, 150 kV-class units delivered to PLN to its strict SPLN standards, and custom units for pulp and paper, fiber, glass, textiles, chemicals, and iron and steel.
Engineered for the Most Demanding Conditions
Power transformers are used at substations and industrial sites where transmission voltages of 500, 275 or 150 kV are converted to 20 kV.
Design and Simulation
Stress and deformation analysis of the tank under vacuum, finite element analysis, and CFD temperature simulation of radiators and fans. How we design
Core and Windings
Grain-oriented electrical steel stacked with a step-lap joint for low iron loss and excitation current. Continuously transposed conductor for primary and secondary windings, net-wrapped for better heat dissipation.
Vapor Phase Drying
VPD removes moisture from the insulation at moderate temperature, preserving the paper’s strength. The tank is then vacuumed and oil-filled for full impregnation.
Low Partial Discharge
Dust-free assembly and careful handling at every stage let our units operate at only tens of picocoulombs of partial discharge.
Tests up to 161 kV
- No-load loss and current
- Lightning impulse
- Line terminal AC withstand
- Induced voltage with partial discharge
- Temperature rise
- Function test of control equipment
- Zero-sequence impedance
- Sweep frequency response (SFRA)
- Oil tests: BDV, DGA, water content
41 Units in PLN Service
From Sumatera to Papua, every one has passed Site Acceptance Test.
Reference Table, SPLN T3.007
Typical values for PLN substation units. Noise ≤ 67 dB at 0.3 m (ONAN). Temperature rise ≤ 50 K oil, ≤ 55 K winding, ≤ 68 K hot spot.
| RatingkVA | VoltagekV | Vector group | No-load losskW | No-load current% | Load losskW | Impedance% | Cooling |
|---|---|---|---|---|---|---|---|
| 100,000 | 150/66/10 | YNyn0+d | 40 | 0.2 | 210 | 12.5 | ONAN/ONAF |
| 60,000 | 150/66/10 | YNyn0+d | 30 | 0.2 | 130 | 12.5 | ONAN/ONAF |
| 60,000 | 150/22/10 | YNyn0+d | 28 | 0.2 | 115 | 12.5 | ONAN/ONAF |
| 60,000 GIS | 150/22/10 | YNyn0+d | 28 | 0.2 | 115 | 12.5 | ONAN/ONAF |
| 30,000 | 150/22/10 | YNyn0+d | 18 | 0.2 | 67 | 12.5 | ONAN/ONAF |
| 30,000 | 66/22 | YNyn0+d | 18 | 0.2 | 67 | 12.5 | ONAN/ONAF |
Values are standard and for reference only.
Request the Power Transformers Catalog
We will send the full product catalog with reference tables and arrangement drawings, or a quotation for your specification.
Prefer to call? (021) 2967 0505