HGT Series Touch Screen High Voltage Motor Solid-State Soft Starter
HGT series high-voltage solid-state AC motor soft starter is a new type of solid-state starting and operation protection product for high-voltage motors. It adopts advanced single-chip microcomputers, integrating high-power semiconductor manufacturing technology, power electronics, and modern control technology — filling the technical gap in the field of thyristor soft starting in China.
The starter utilizes high-power thyristor (SCR) modules connected in series as the main control element, achieving smooth voltage ramp-up and current limitation during motor starting by controlling the thyristor conduction angle. This eliminates the mechanical shock and current surge associated with direct-on-line (DOL) starting, significantly reducing stress on the motor, driven equipment, and upstream power supply system. The built-in touch screen interface provides intuitive parameter setting, real-time monitoring, and fault diagnosis capabilities.
Technical Specifications
| Item | Specification |
|---|---|
| Rated Voltage | 3kV / 6kV / 10kV |
| Rated Frequency | 50Hz / 60Hz |
| Rated Power Range | 200kW – 10,000kW (customizable) |
| Rated Current | Up to 1250A |
| Starting Mode | Current limiting / Voltage ramp / Soft stop (selectable) |
| Current Limiting Range | 100% – 500% of rated current (adjustable) |
| Initial Voltage | 10% – 80% of rated voltage (adjustable) |
| Ramp Time | 1 – 120 seconds (adjustable) |
| Protection Functions | Overcurrent, overload, phase loss, phase imbalance, overvoltage, undervoltage, SCR overtemperature, motor overtemperature, stall protection |
| Control Interface | 7-inch high-definition touch screen (Chinese/English) |
| Communication Protocols | RS485 / Modbus RTU / Profibus DP / Ethernet (optional) |
| Degree of Protection | IP30 (cabinet) / IP42 (optional) |
| Cooling Method | Natural air cooling (forced air cooling for high-current models) |
| SCR Configuration | Multiple thyristors in series with automatic voltage-sharing |
| Standards | GB/T 12668, IEC 60947-4-2 |
Key Features
- Advanced Thyristor Series Technology: High-power SCR modules connected in series with dynamic and static voltage-sharing circuits ensure reliable operation at 3–10kV voltage levels, with redundant SCR design providing continued operation capability even if a single thyristor fails
- Multiple Starting Modes: Supports current-limiting start, voltage ramp start, and soft stop modes, allowing flexible configuration for different motor and load types — centrifugal pumps, fans, compressors, conveyors, and crushers
- Touch Screen HMI: Industrial-grade 7-inch touch screen provides intuitive parameter setting, real-time current/voltage/torque display, historical event logging, and comprehensive fault diagnosis with graphical interfaces
- Comprehensive Motor Protection: Built-in microprocessor-based protection covers all major fault conditions including overcurrent, overload, phase loss, phase imbalance, overvoltage, undervoltage, SCR overtemperature, and motor overtemperature — eliminating the need for separate protection relays in many installations
- Reduced Starting Current: Limits motor starting current to typically 2–4 times rated current compared to 6–8 times for DOL starting, reducing voltage dips on the supply network and minimizing thermal stress on motor windings
- Mechanical Stress Reduction: Smooth torque ramp eliminates mechanical shock to driven equipment — extends the service life of couplings, gearboxes, belts, and bearings by reducing starting torque transients
- Soft Stop Function: Programmable soft stop gradually reduces motor voltage rather than instant disconnect, preventing water hammer in pump systems and material spillage on conveyor belts
- Remote Monitoring and Control: Standard RS485/Modbus RTU communication interface enables integration with plant DCS or SCADA systems for remote start/stop control and real-time operating parameter monitoring
Applications
- High-voltage induction and synchronous motors in industrial plants
- Centrifugal pumps and fans — water supply, HVAC, power plant auxiliaries
- Compressors — air, refrigeration, and process gas
- Conveyors and belt drives — mining, cement, material handling
- Crushers and mills — mining and mineral processing
- Ball mills, kilns, and extruders — cement and chemical industries
- API pumps — oil and gas pipeline and refinery applications
- Draft fans and ID fans — thermal power plants