In “ Dual Carbon ” Driven by the dual forces of strategic trends and the increasing scale of industrial equipment, China’s high-end motor control sector has achieved a significant technological breakthrough. Recently, Changsha ATA Automation Co., Ltd. has completely independently developed— 28000kW The high-voltage solid-state soft starter has been successfully put into operation at a major petrochemical base in China, further strengthening our country's technological strength and market competitiveness in the field of solid-state soft starting technology for high-power motors. 

                        Independently developed by Changsha Otto 28000kW High-voltage solid-state soft starter device 

I. Challenge: The Dilemma of Starting Ultra-High-Power Motors 

The petrochemical base is equipped with two extra-large, brushless synchronous motors for its critical processes, each with a rated power of up to... 25000kW , Voltage level 10kV rated current 1523A If a direct-start method is employed, the inrush current will far exceed the grid’s capacity, causing voltage dips, false tripping of protective devices, and even triggering a total plant blackout and production interruption—resulting in immeasurable economic losses and safety risks. Therefore, users have placed nearly stringent requirements on soft-start systems: the starting current must be limited to an extremely low level, the load must start smoothly, successful startup must be guaranteed on the first attempt, and the system must exhibit industry-leading reliability. 

Leveraging its extensive application experience and technological expertise accumulated over many years in the field of high-voltage, high-power soft starters, Changsha Otto quickly responded to and undertook this highly challenging task.

ABB Ultra-high-power brushless synchronous motor 

II. Breakthrough: Ultra-High-Power, High-Voltage Solid-State Soft-Start Device 

Facing this technological challenge, Changsha Otto, leveraging its mature high-power product platform and extensive engineering experience, has provided a completely independently developed... ATA QB-H10/28000 The high-voltage solid-state soft starter device serves as the solution. This device is specifically designed for the starting conditions of extra-large-power motors and boasts the following core technological advantages: 

1.  Design and Manufacturing Technology for Ultra-High-Power Thyristor Valve Assemblies 

The core highlight of this project lies in its single-unit capacity reaching... 28000kW The thyristor valve group has been successfully applied. This solution employs the company’s independently developed dynamic voltage and current equalization technology, scientifically combining multiple high-voltage, high-current thyristor devices in series and parallel configurations to create a highly reliable power unit capable of withstanding prolonged high-current surges. Solid-state soft-start devices at this power level represent cutting-edge applications both domestically and internationally. Relying on its continuous technological accumulation and extensive successful experience in numerous high-power projects, Changsha ATA has once again achieved stable operation under extreme conditions, further demonstrating the maturity and leadership of domestically produced high-end equipment in the field of high-power drive control. 

2.  Golden Start Curve Based on Precise Parameter Calculation 

Unlike conventional general parameter settings, the Changsha ATA technical team conducted in-depth simulation analysis and dynamic modeling based on the detailed motor parameters and mechanical characteristics of the load provided by the user, while also taking into account grid conditions. Through precise calculations, they determined the current-limiting value. 2.3 Twice the motor's rated current and 22 The optimal combination of starting parameters—the bypass time in seconds. This setting, while ensuring sufficient starting torque to overcome the load resistance torque, reduces the starting current to its theoretically minimum level, achieving a perfect balance between efficiency and safety. 

3.  Both-stage debugging succeeded on the first try. 

Phase 1 ( 2025 Year 4 Month): The first soft-start device successfully passed its loaded commissioning on the first attempt. The measured starting current was precisely limited within the set value range, and the voltage drop on the grid side was effectively controlled within... 15% Within this range, the results are fully consistent with previous theoretical calculations and significantly outperform the industry’s conventional levels in both simulation calculations and engineering applications, ensuring a smooth and seamless startup process for both the motor and the load equipment. 

Phase 2 ( 2025 Year 11 At the end of the month: The second set of equipment successfully achieved a single-attempt, full-load startup again under exactly the same optimized parameter settings. During operation, the two sets of equipment demonstrated outstanding consistency in performance, and no electrical interference occurred between them, fully validating the reliability and stability of the system design. 

Developed independently by Changsha Otto 28000kW High-voltage solid-state soft starter device 

III. Innovation: Peak Power, Precise Control 

The successful implementation of this project not only marks a successful product delivery but also highlights the capability of domestically produced high-end soft-start devices to fully replace imported ones and serve major engineering projects. 

1.  Comprehensive power coverage, with strong potential to serve as a high-end alternative. 

Success-driven 25000kW/10kV The ultra-high-power motor signifies that Changsha ATA’s high-voltage solid-state soft-start products have achieved full-series coverage—from medium- and low-power applications all the way to ultra-high-power applications. In the most advanced application scenarios, these products demonstrate performance that rivals or even surpasses that of international brands, possessing a solid capability to fully achieve domestic substitution. 

2.  The control accuracy has reached the internationally advanced level. 

On such a high-power platform, precise closed-loop control of the inrush current is achieved, and operations lasting up to... 22 The smooth, ramp-like torque rise over seconds demonstrates Changsha ATA’s profound technical expertise in fields such as power electronics and advanced control algorithms. Its control accuracy and reliability have fully reached the advanced level of comparable international products. 

3.  System integration capabilities demonstrate overall strength. 

The project involves complex system engineering challenges, including ultra-high-power cabinet structure and thermal management design, coordination of high-voltage isolation and insulation, fiber-optic triggering and real-time monitoring, and the synergistic implementation of multiple protection strategies. The successful commissioning of both sets of equipment one after another fully demonstrates that Changsha ATA possesses end-to-end, high-end integration and delivery capabilities—from core power devices and complete machine systems to engineering applications—enabling it to fully meet the demand for import substitution of high-performance soft-start systems in the high-end industrial sector. 

During project commissioning, technical personnel are performing system parameter verification.

Four, Industry Significance: A Milestone for China's High-End Equipment 

The success of this project not only reflects Changsha ATA’s strong technical capabilities, but also holds profound demonstration and driving effects on the development of China’s high-end equipment manufacturing industry. 

• Consolidate the leading position of domestically produced high-end equipment. : This time 28000kW The successful commissioning of the high-voltage solid-state soft starter once again demonstrates the outstanding reliability of domestically produced high-end soft-start equipment under extreme operating conditions, highlighting China’s mature capabilities across the entire chain—from independent design and manufacturing to engineering application—in this field. 
• Promote comprehensive domestic substitution in key areas. In heavy industrial sectors critical to the national economy and people's livelihood—such as petrochemicals, coal chemicals, large-scale metallurgy, mining, and water conservancy—the case fully demonstrates that domestically produced equipment can now completely replace imported products, achieving ultra-high-power transmission systems. “ Green Start ” Together with safety regulation, it has effectively ensured the localization of equipment and supply chain security for the country’s critical industries. 
• Promote technological upgrades and green development in the industry. : In “ Dual Carbon ” Against the backdrop of industrial energy conservation and consumption reduction, the successful application of this device highlights the comprehensive value of leveraging advanced soft-start technology to optimize the energy efficiency of motor systems, mitigate grid impacts, and extend equipment lifespan. It provides a replicable technological pathway for the transformation and upgrading of traditional high-energy-consuming industries. 
• Strengthen our voice in international competition. The stable performance of domestically produced equipment under extreme operating conditions demonstrates China's strength in the field of high-precision and advanced industrial control, breaking the long-standing monopoly held by foreign brands in the ultra-high-power, high-end market and enhancing the international competitiveness and brand influence of China's equipment manufacturing industry. 

During project commissioning, technical personnel are performing system parameter verification.

V. Conclusion 

This time 28000kW The successful commissioning of the high-voltage solid-state soft starter marks another significant milestone in China’s drive toward self-reliance in advanced motor control equipment. It clearly demonstrates that, on the path to overcoming critical technological challenges, domestically produced equipment can not only achieve— “ From nothing to something ” , and can even do more “ From having to being strong ” Gaining market trust through outstanding performance and reliable quality, we have fully achieved import substitution. 

Changsha ATA Automation Co., Ltd. will continue to deepen its expertise in the fields of power electronics and intelligent control, using innovation as the driving force to help China’s industrial sector steadily advance on the path of high-quality development and contribute even more to building a self-reliant and controllable high-end equipment system.