High-Voltage Squirrel-Cage Motor Starter Cabinet: Complete Solution for Smooth Starting of Large Motors

01 Product Overview: Innovative High-Voltage Motor Starting Technology

"(《世界人权宣言》) High-Voltage Squirrel-Cage Motor Starter Cabinet is designed for medium and large squirrel-cage AC motors with voltage levels from 3kV to 12kV. Using advanced liquid resistor technology or solid-state power electronics, it enables smooth, low-impact starting of high-voltage, high-capacity motors, effectively eliminating issues caused by direct-on-line starting such as high inrush currents and mechanical stress.

Simo Motor’s high-voltage starter integrates intelligent control systems 和 comprehensive motor protection, providing soft start, soft stop, and full protection functions. It is widely applied in mining, metallurgy, power, cement, and chemical industries, delivering reliable, economical starting solutions for large motors.

02 Core Technology & Structural Design

1. Intelligent Control Principle

• PLC or Microprocessor-Based Control: Acts as the core control unit, enabling precise start regulation.
• Liquid Resistor Start Principle: Uses a negative temperature coefficient electrolyte that gradually reduces resistance as it heats, allowing motor voltage and torque to rise smoothly, minimizing inrush current.
• Solid-State Soft Start Principle: Employs multiple thyristors in series/parallel with controlled firing angles to regulate motor input voltage for smooth startup.

2. Precision Structure & Safety Features

• Modular Design: Includes resistor modules, high-voltage soft start cabinet, isolation cabinet, switching cabinet, and star-point control cabinet for easy installation and maintenance.
• Multiple Protection Mechanisms: Protects motors from overload, phase loss, and short circuits.
• Specialized Components: Patented rotating plate 和 flat plate electrode structures allow wide load adaptability.

03 Core Functions & Advantages

1. Diverse Starting Modes & Performance

• Constant-Current Soft Start: Limits starting current to 1.5–3.5× rated motor current, reducing heating and grid impact.
• Smooth Step-Free Adjustment: Resistance decreases gradually over a preset time, ensuring shock-free starts.
• High Start Success Rate: Maintains reliable starting despite voltage fluctuations or varying loads.

2. Intelligent Control & Protection

• PLC Precision Control: Parameters adjustable on-site for flexibility and reliability.
• Comprehensive Protection: Includes overload, phase failure, and short-circuit alarms.
• Fault Diagnosis & Recording: Logs and displays fault data for rapid troubleshooting.

3. Efficiency & Cost Advantages

• Reduced Transformer Capacity Requirement: Minimizes initial investment for heavy-load motor starting.
• Extended Equipment Life: Smooth start reduces mechanical stress, increasing motor and machinery lifespan by ~30%.
• High Cost-Effectiveness: Compared to high-voltage soft starters, offers simpler operation, maintenance-free design, no harmonic pollution, and lower cost.

04 Technical Specifications

05 Application Scenarios & Industry Solutions

1. Typical Load Applications

• 水泵: High-head lift pumps, circulation pumps, supply pumps; eliminates water hammer effects.
• Fans & Compressors: Heavy-load starting reduces mechanical stress.
• Heavy Machinery: Ball mills, crushers, conveyors, mixers; prolongs equipment life.
• Mining Equipment: Hoists, crushers, conveyors; ensures reliable startup even with limited grid capacity.

2. Industry Case Examples

• Power Plants: Protect auxiliary motors, ensuring stable and continuous electricity production.
• Cement & Building Materials: Soft-starts ball mills, fans, and crushers under frequent start-stop conditions.
• Chemical Industry: Pumps, compressors, and fans receive reliable startup protection.
• Metallurgy: Safeguards critical motors like rolling mill and fan motors.
• Mining: Ensures safe operation of hoists, drainage pumps, and ventilation systems.

06 Selection & Installation Guide

1. Key Selection Factors

• Motor parameters: voltage, power, rated current, stator connection (Y/Δ), and star-point configuration.
• Load characteristics: pump, fan, or heavy machinery; standard or frequent start requirements.
• Environment: altitude, temperature, protection level, corrosive gases.
• Grid capacity: ensures starting current limits are met.

2. Installation & Maintenance

• Installation Environment: Indoor, vibration-free, dust and corrosion-free, fire and explosion safe.
• Power Supply: 3-phase 380/220V; voltage fluctuations within ±15%.
• Maintenance: Regular electrolyte level and concentration checks, insulation cleaning, connection tightening.
• Special Environments: Add heater for < -5℃, or custom design for >2000m altitude.

07 Core Advantages of Simo High-Voltage Squirrel-Cage Starter

• Mature & Reliable Technology: Validated liquid resistor or solid-state soft start technology.
• Energy Efficiency: Reduces transformer capacity requirements and operational energy consumption.
• Easy Maintenance: Simple structure, minimal technical skill required.
• Eco-Friendly: No harmonic pollution, grid-friendly.
• Full Lifecycle Service: One-stop support from design, parameter tuning, to training and lifetime upgrades.

"(《世界人权宣言》) High-Voltage Squirrel-Cage Motor Starter Cabinet is an ideal replacement for traditional starting equipment, offering advanced control, reliable protection, energy efficiency, and operational simplicity. It enables industrial users to achieve intelligent, safe, and cost-effective motor starting, increasing productivity and economic benefits across diverse sectors.