[Introduction] 

In high-energy-consuming industries such as steel, petrochemicals, and mining, the startup of high-power motors has always been a critical challenge. —— High current surges, severe voltage drops in the power grid, and a high risk of mechanical damage not only reduce production efficiency but also pose serious threats to equipment safety. Recently, Changsha ATA's independently developed ATAF-H10/18000 The medium- and high-voltage soft-start device was successfully applied to an air separation gas supply project at a major steel enterprise, delivering outstanding performance that achieves “ Smooth start, worry-free grid operation, and mechanical protection "Three major breakthroughs have set a benchmark case for the industry." 

I. Project Background and Challenges 

To ensure the stable and efficient operation of its production line, a steel company has built a new set 30000Nm ³ /h Air separation and supply system. The core power equipment of this system includes a compressor driven by an air compressor. 10kV/18000kW Ultra-high-power motor and one driven by a booster compressor 10kV/10000kW Motor. 

The core challenges facing the project: 

1.  The inrush current is enormous: If a motor with such high power were to use other conventional reduced-voltage starting methods, the starting current could reach up to the rated current. 2-4 Twice, meaning more than 4000A , which will cause a significant impact on the plant's power grid. 

2.  Severe grid voltage drop: The massive inrush current can cause an instantaneous drop in busbar voltage, severely impacting the normal operation of other sensitive equipment on the power grid—and could even trigger circuit breakers, leading to production shutdowns and substantial economic losses. 

3.  Mechanical damage to equipment: The significant torque surge caused by high-current starting can also harm the compressor and booster's internal mechanical components, such as bearings and gears, ultimately shortening the equipment's lifespan. 

Traditional voltage-lowering starting methods cannot completely solve these issues. Therefore, users ultimately chose the solution provided by our company. ATAF-H10/18000 The medium- and high-voltage soft-start device employs an advanced "one-to-two" control mode to smoothly and softly start two motors simultaneously. 

II. Solutions and Product Configurations 

Core Equipment: ATAF-H10/18000 High-Voltage Step-Down Soft-Start Device ( One-to-Two Mode )

Control Object 1 : Air compressor motor, rated power 18000kW , Rated Current 1176A。

Control Object 2 : Booster compressor motor, rated power 10000kW , Rated Current 655.3A 。

Core Advantage: Changsha Otto's medium- and high-voltage soft-start device for fluid coupling utilizes step-wave soft-start technology, significantly reducing the motor starting current—from several times the rated current in traditional systems—to a much lower level. 0.5 Around twice the rated current, this method achieves smooth, impact-free motor torque startup, fundamentally resolving the issue of grid voltage dips. It particularly excels in applications with limited grid capacity and stringent requirements for starting current—specifically, when the starting current must remain below the motor’s rated current—offering significant advantages that no other reduced-voltage soft-start devices can match. 

III. Operational Performance and Performance Data 

After intense debugging, the equipment was 9 Month 11 The first operation on the day was successful, with both motors starting up normally. All performance indicators significantly exceeded the technical requirements. 

Air compressor 18000kW ) Startup effect: 

Starting current: Stabilized at 380A Approximately at the rated current 1176A Of the 0.4 Twice )

Startup time: Bypass time is 300 About a second later, the rotational speed steadily increased, with no abnormalities observed. 

Boosting unit ( 10000kW ) Startup effect: 

Starting current: Significantly lower than the rated current, yet still maintained at an excellent level. 

Grid Impact: Throughout the entire startup process, voltage fluctuations on the plant's busbar were minimal, causing no adverse effects on the operation of other equipment connected to the power grid. 

Mechanical Impact: Both air compressors and boosters achieve smooth, vibration-free starting, effectively protecting connected equipment and extending its service life. 

4.   Case Summary and Its Promotional Value 

The success of this project is ATAF Another exemplary application of the series high-voltage soft-start devices in the field of high-power motor startups. It fully demonstrates the product's outstanding capability in addressing industry-specific pain points: 

1.  Perfectly Solving the Challenge of Power Grid Impact: 0.5 Ultra-low starting current at twice the rated current , it completely eliminates the impact of large motor startups on the power grid, serving as a "powerful tool" to ensure the safe and stable operation of the grid. 

2.  Outstanding starting performance: Up to 300 The smooth, linear acceleration of seconds perfectly matches the startup characteristics of high-inertia loads such as compressors and fans, providing optimal protection for mechanical equipment. 

3.  Powerful adaptability: The "1-to-2" mode demonstrates the product's flexible applicability and excellent cost-effectiveness, as a single unit can effortlessly handle the starting needs of multiple large motors. 

4.  Professional technical services: Our company's engineering team—known for their strong technical expertise and dedicated service attitude—plays a vital role in delivering product value, providing customers with "products + A complete, high-quality experience of "service." 

This case has significant promotional and demonstrative effects, serving as a valuable reference for all users across industries such as metallurgy, chemical engineering, mining, and cement who are grappling with the challenges of starting high-power motors—simply choose Changsha ATA. ATAF The high-voltage soft-start device series is undoubtedly the ultimate solution—reliable, efficient, and cost-effective. We look forward to delivering greater value to more customers, helping businesses achieve safe, energy-efficient, and stable production.