| Brand | ROCKWILL |
| Model NO. | 800kV 1000kV Single-phase Autotransformer with Three Windings and No Excitation manufacturer |
| Rated voltage | 1000kV |
| Rated frequency | 50/60Hz |
| Series | ODFPS |
Description：
Our company boasts a professional Research and Development and production team, capable of manufacturing oil-immersed power transformers (up to 1000kV), special transformers, reactors, dry-type transformers, and intelligent online monitoring systems. Notably, the production and sales volume of our 110kV transformers has consistently ranked among the top in China for years.
The 1000kV Single-phase Autotransformer with Three Windings and No Excitation is a cutting-edge electrical equipment engineered for ultra-high voltage power transmission systems. Featuring a single-phase structure, it adopts an autotransformer design with three windings and operates without excitation voltage regulation.
With a rated voltage of 1000kV, this transformer boasts advanced insulation technology and a robust structural design, ensuring exceptional performance in withstanding overvoltages and short-circuit currents. It achieves low energy loss, low partial discharge levels, and excellent thermal stability, making it highly reliable for long-term operation in large-scale power grid projects.
Compliant with international electrical industry standards, it is widely used in ultra-high voltage transmission networks, providing efficient and stable energy transfer while contributing to the optimization of power grid layouts and the enhancement of overall power supply quality.
Reasonable structure based on modern calculation technology, analysis of the electrical, magnetic, force and thermal characteristics of the transformer.
Advanced performance based on IEC standards, specially designed as customer requirements, obviously lower PD than the value in IEC60076-3.
High reliability based on the analysis of electrical, magnetic, force and thermal characteristics, reasonable transformer insulation structure, proper ampere turn distribution and the cooling system resulting in high ability of withstanding over-voltage and short-circuit current, no possibility of local overheat.
Optimal accessories：Superior user experience based on good visual, leak-free, un-tanking, maintenance-free.
Technical Parameters
The voltage classes of some of these Power Transformer include 6kV, 6.3kV, 6.6kV, 6.9kV, 7.2kV, 10kV, 10.5kV, 11kV, 11.5kV, 12kV, 13.2kV, 13.8kV, 14.5kV, 14.4kV, 15kV, 15.5kV, 15.6kV, 17.5kV, 20kV, 21.9kV, 22kV, 24kV, 30kV, 33kV, 33.5kV, 34.5kV, 35kV, 36kV, 38kV, 38.5kV, 40.5kV, 44kV, 45kV, 46kV, 66kV 69kV.72.5kV 88kV 110kV 115kV 123kV 125kV 126kV 132kV 138kV 145kV 150kV 154kV 161kV 170kV 220kV 225kV 230kV 245kV 275kV 330kV 345kV 363kV 380kV 400kV 500kV Power transformers of voltage ，and aboveand customization is available.
Rated capacity (kVA) |
1000 |
|
Voltage combination and tapping range |
HV (kV) |
1050/√3 |
Tapping range(kV) |
525/√3 ±4×1.25% |
|
LV (kV) |
110 |
|
Vector group |
Iaoi00 |
|
No-load loss(kW) |
180 |
|
On-load loss(kW) |
1500 |
|
No-load current (%) |
0.15 |
|
Short-circuit impedance (%) |
HV–MV18 HV–LV62 MV–LV40 |
|
Capacity assignment (MVA) |
1000/1000/334 |
|
Normal Service Conditions
(1) Altitude: ≤1000m;
(2) Ambient temperature:Maximum temperature: +40℃;Maximum monthly average temperature: +30℃;Maximum yearly average temperature: +20℃;Minimum temperature: -25℃.
(3) Power supply: approximate sinusoidal wave, three-phase symmetrical approximately
(4) Installation site: indoor or outdoor, without the obvious contamination.Note: The transformer used in special conditions should be specified when ordered.
Core:
Adopting highest quality, non-aging, cold-rolled, grain-oriented, and high permeability silicon steel lamination silicon steel sheets.
Processed on the GEORG length-cutting line from Germany.
Fully mitred joint, step lapping and polyester tape binding structure making the transformer with low no-load losses and low noise level.
Placing vibration isolation pads between the body and the tank to reduce vibration that transmits to the tank.
Winding:
Winded by high-quality oxygen free copper with lower resistivity.
Processed and manufactured on horizontal winding machines and large CNC vertical winding machines from both radial and axial directions.
Reasonable transposition applied between paralleling wires, magnetic shielding used for guiding flux leakage when necessary to reduce the stray losses of the transformer.
Reasonable design of insulation structure improving the ability of withstanding overvoltage.
Optimizing the ampere turns distribution of the winding, increasing the radial support and axial compression of the winding, using the pre-densification of spacers, constant pressure drying, to resist the impulse current.
Tank:
Bell type or cover bolted type tank.
Carbon dioxide shielded welding process.
High-quality gaskets and the limit groove.
Strict leak detection test procedures.
Others:
Cold-weld connection technology leads to improve the cleanliness of active part.
The vacuum disassembly and the vacuum filling technology measures reduce the partial discharge level effectively and enhance the transformer operating reliability.
The structure of "Six Direction Positioning" between the active part and the tank assures that the transformer has a strong ability of anti-transportation impact or anti-earthquake.
Surface treatment and coating, fine processing to tank surface, 7 steps such as acid-washing and phosphating, etc. special anti-fouling paint, ensuring not falling off or rusting away.
It features advanced insulation technology and a robust structural design, enabling it to withstand high overvoltages and short-circuit currents effectively. With low energy loss, low partial discharge levels, and excellent thermal stability, it ensures long-term reliable operation in complex power grid environments. Additionally, it complies with international electrical industry standards, further guaranteeing its performance and reliability.
It is mainly applied in ultra-high voltage (UHV) power transmission projects, especially in long-distance, large-capacity power grid interconnection systems. It plays a key role in realizing efficient energy transfer between different voltage levels, optimizing power grid layout, and ensuring stable power supply for large-scale regional power grids.
