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High voltage soft start state cabinet is mainly suitable for (3~10kV) squirrel cage asynchronous motor start and stop control and protection. The high quality anti-parallel thyristor components and electronic control equipment are connected between the stator winding of the high voltage motor and the power supply. When the motor starts, according to a certain law (such as constant current or voltage slope) control the conduction of the thyristors, and continuously change the input of the stator winding of the motor from starting voltage to full voltage. After the start is completed, the bypass contactor is pulled in. It has the function of fault protection such as over-current, short-phase starting, peak overcurrent, etc. Using it can effectively avoid the harmful impact caused by excessive motor starting current to the power grid, and can normally use high-power motor under limited power grid capacity and extend its service life. In addition, High voltage soft start state cabinet also has a "soft stop" function, when soft stop, the motor stator winding voltage will be smoothly reduced, thus avoiding the sudden stagnation of the equipment, which is useful for the pump (can avoid the effect of water hammer) or conveyor belt.
The cabinet integrates the high-voltage solid-state soft-start cabinet, high-voltage switch cabinet, and bypass cabinet into an integrated structure. The starting cabinet area is reduced by half compared to separate installations, while fully retaining all control and protection operations.
Adjusts the voltage by changing the conduction angle of the thyristor without energy loss. Limits the starting current to only 2.5 to 3.5 times the rated current, ensuring high energy-saving efficiency.
Designed with a special resistance-capacitance absorption circuit, yielding robust anti-interference performance. Stably operates regardless of ambient temperature or geographical location, supporting frequent start-ups.
Includes built-in fault protection functions such as overload, phase loss, and starting peak overcurrent. All starting parameters are adjustable, selectable, and fully controllable.
Reduces wiring cables between units through integrated design. Requires zero additional maintenance after deployment, providing significant long-term cost savings.
| Parameter Item | Specifications / Details |
|---|---|
| Voltage | 3~10kV (11kV Motor requires special design) |
| Power | 200~15000kW (Above 5000kW special custom cabinet sizes are required) |
| Starting Current | 2.5~3.5 times rated current |
| Starting Pressure Drop | With bypass contactor ＜ 3V |
| Starting Time | 0~120s adjustable |
| Starting Frequency | Frequent start-up possible |
| Start-up Method | Current limiting starts; Voltage linear curve starts; Voltage exponential curve starts; Current starts with a linear curve; Current exponential curve starts |
| Shutdown Mode | Free shutdown; Soft shutdown; Brake; Soft shutdown + Brake; Point function |
| Overload Capacity | 500% 30s, 120% long-term |
| Communication Function | RS485 Port |
| Protection Grade | IP4X |
| Structure | Cabinet |
| Dimension | W*D*H: 1000*1500*2300 mm |
| Protection Function | Run Over Current Protection; Motor Thermal Overload Protection; Phase Current Unbalance Protection; Phase Loss Protection; Overheat Protection |
| Altitude | Standard altitude ≤ 1000m |
| Ambient Temperature | -25 °C ~ + 45 °C |
| Maximum Relative Humidity | 95% non-condensing |
| Mounting Environment | Non-corrosive gas; Non-conducting dust; No violent vibration (＜0.5G); Well-ventilated |
Soft starting cabinet can reduce the motor hard starting (i.e., direct starting) caused by the grid voltage drop, so that it does not affect the normal operation of other electrical equipment in the common network. It reduces the motor's inrush current, which otherwise causes local temperature rise to be too large and reduces the service life of the motor. It also mitigates the mechanical impulse brought about by hard starting, preventing accelerated wear and tear of transmission machinery (shafts, mesh gears) and minimizing electromagnetic interference.
Furthermore, the soft start cabinet enables the motor to start and stop smoothly and freely, minimizing idling periods, improving the overall operation rate, and thus providing an energy-saving effect.
