1000kV Single-phase Autotransformer with Three Windings and No Excitation manufacturer
Key attributes
| Brand | ROCKWILL |
| Model NO. | 1000kV Single-phase Autotransformer with Three Windings and No Excitation manufacturer |
| Rated voltage | 1000kV |
| Rated frequency | 50/60Hz |
| Series | ODFPS |
Product descriptions from the supplier
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.
Product Characteristics:
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
Among these, some autotransformers cover non-standard voltage levels including 121kV, 132kV, 138kV, 200kV, 225kV, 230kV, 245kV, 275kV, 330kV, 345kV, 400kV and 756kV. We also provide customization services.
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.
Introduction to Structure and Performance:
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.
Related Products
-
35kV Class oil-immersed transformer
-
550kV Class oil-immersed transformer
-
330kV Class oil-immersed transformer
-
220kV Class oil-immersed transformer
-
110kV Class oil-immersed transformer
-
500kV 550kV Single-phase Oil-Immersed Air-Cooled Autotransformer with Three Windings and No Excitation
-
750kV Single-phase Oil-Immersed Autotransformer with Three Windings and No Excitation
Related Knowledges
-
How to Implement Transformer Gap Protection & Standard Shutdown StepsHow to Implement Transformer Neutral Grounding Gap Protection Measures?In a certain power grid, when a single-phase ground fault occurs on a power supply line, both the transformer neutral grounding gap protection and the power supply line protection operate simultaneously, causing an outage of an otherwise healthy transformer. The main reason is that during a system single-phase ground fault, the zero-sequence overvoltage causes the transformer neutral grounding gap to break down. The resultingNoah12/05/2025 -
GIS Dual Grounding & Direct Grounding: State Grid 2018 Anti-Accident Measures1. Regarding GIS, how should the requirement in Clause 14.1.1.4 of the State Grid’s "Eighteen Anti-Accident Measures" (2018 Edition) be understood?14.1.1.4: The neutral point of a transformer shall be connected to two different sides of the main mesh of the grounding grid via two grounding down conductors, and each grounding down conductor shall meet the thermal stability verification requirements. Main equipment and equipment structures shall each have two grounding down conductors connected toEcho12/05/2025 -
Innovative & Common Winding Structures for 10kV High-Voltage High-Frequency Transformers1.Innovative Winding Structures for 10 kV-Class High-Voltage High-Frequency Transformers1.1 Zoned and Partially Potted Ventilated Structure Two U-shaped ferrite cores are mated to form a magnetic core unit, or further assembled into series/series-parallel core modules. Primary and secondary bobbins are mounted on the left and right straight legs of the core, respectively, with the core mating plane serving as the boundary layer. Windings of the same type are grouped on the same side. Litz wire iNoah12/05/2025 -
How to Increase Transformer Capacity? What Needs to Be Replaced for Transformer Capacity Upgrade?How to Increase Transformer Capacity? What Needs to Be Replaced for Transformer Capacity Upgrade?Transformer capacity upgrade refers to improving the capacity of a transformer without replacing the entire unit, through certain methods. In applications requiring high current or high power output, transformer capacity upgrades are often necessary to meet demand. This article introduces methods for transformer capacity upgrade and the components that need to be replaced.A transformer is a criticalEcho12/04/2025 -
Causes of Transformer Differential Current and Hazards of Transformer Bias CurrentCauses of Transformer Differential Current and Hazards of Transformer Bias CurrentTransformer differential current is caused by factors such as incomplete symmetry of the magnetic circuit or insulation damage. Differential current occurs when the primary and secondary sides of the transformer are grounded or when the load is unbalanced.Firstly, transformer differential current leads to energy waste. Differential current causes additional power loss in the transformer, increasing the load on theEdwiin12/04/2025 -
Protection Logic Improvement and Engineering Application of Grounding Transformers in Rail Transit Power Supply Systems1. System Configuration and Operating ConditionsThe main transformers at Zhengzhou Rail Transit’s Convention & Exhibition Center Main Substation and Municipal Stadium Main Substation adopt a star/delta winding connection with a non-grounded neutral point operation mode. On the 35 kV bus side, a Zigzag grounding transformer is used, connected to ground through a low-value resistor, and also supplies station service loads. When a single-phase ground short-circuit fault occurs on a line, a pathEcho12/04/2025
Related Solutions
-
Intelligent Operation Solution for 12kV Vacuum Circuit Breakers: Integrating Real-time Monitoring & Lifetime OptimizationⅠ. Equipment Operation & MaintenanceIntelligent Monitoring System IntegrationMulti-parameter Real-time Monitoring: Embedded sensors (temperature, displacement, Hall effect current sensors) track contact temperature rise, mechanical characteristics (opening/closing speed, overtravel), coil current, and partial discharge signals. Data undergoes preprocessing via edge computing prior to cloud upload.Lifetime Prediction Model: Dynamically evaluates remaining lifespan using electrical wear dataRockwill06/10/2025 -
SF6 Circuit Breaker Solutions for Outdoor Installation (Anti-Pollution & Seismic Resistance)I.Core Challenges in Outdoor InstallationIn high-voltage transmission and distribution systems, SF6 circuit breakers are exposed to complex outdoor environments for extended periods, facing the following critical issues:Pollution & Insulation DegradationDust, salt fog, and industrial pollutants in outdoor environments easily adhere to equipment surfaces. In coastal or industrial areas, pollution levels may reach Class IV, resulting in insufficient creepage distance and triggering flashoRockwill05/12/2025 -
12kV Indoor Vacuum Circuit Breaker Southeast Asia Solution: Anti-Corrosion Compact Design12kV Indoor Vacuum Circuit Breaker Southeast Asia Solution: Anti-Corrosion Compact DesignⅠ. Executive SummarySoutheast Asia faces rapidly growing electricity demand alongside environmental challenges including high temperatures, humidity, salt spray corrosion, and grid instability. This solution recommends Solid Insulated Pole-Mounted Vacuum Circuit Breakers (VCB) featuring high reliability, compact design, and smart monitoring. Tailored for tropical climates and industrial scenarios, itRockwill06/10/2025
