Product Overview
The system features a unified, fully integrated architecture that houses the transformer, power converter, controls, and medium-voltage switchgear-including an optional bypass cabinet-all pre-wired and assembled. This design addresses both retrofit upgrades and new installations, helping to reduce capital expenditure and shorten project timelines. For on-site setup, only connections for medium-voltage input/output cables (such as those for a 4160V VFD configuration), low-voltage control power, and signal lines are required.
Engineered for streamlined deployment and operation, the RNHV series medium-voltage drive supports consolidated transportation and front-accessible servicing. This simplifies field installation, maintenance, and commissioning. Its DC bus employs metallized film capacitors with integrated mechanical bypass modules, offering greater reliability, zero maintenance, and extended operational life compared to traditional electrolytic capacitor designs. Equipped with advanced protection and adaptive control features, the drive delivers precise speed regulation across diverse operating conditions-making it an ideal 4160V VFD solution for demanding industrial applications.
Output power: Maximum power of 10kV/14000kW and 6kV/8000kW.
Standard Industrial Design: Supports various voltage levels ranging from 3 to 13.8kV, suitable for high altitude, low temperature, and high humidity applications.
Customization for Customers: Supports customized functionality and appearance to meet diverse customer requirements.
VFD Type: Voltage source cascaded multilevel technology with no special requirements for motors and cables, achieving perfect harmonic-free operation without the need for filters. Direct power supply distance can reach up to 1000m
Siemens PLC：Provides safe and reliable precise logic process control with standard industrial interfaces.
Vector Control
The reliance on speed sensors can introduce reliability concerns, making it advisable to minimize their use where feasible. Conventional closed-loop systems utilizing such sensors typically operate on V/F control, which offers limited accuracy, restricted torque regulation, and ineffective motor control near zero speed.
In contrast, open-loop control-often referred to as sensorless vector control-improves starting torque performance and enables more precise torque and speed regulation at low motor speeds. This approach can deliver low-speed control comparable to closed-loop systems while avoiding the higher maintenance costs associated with physical sensors.
Additionally, modern variable frequency drives are capable of automatically identifying motor parameters essential for vector control, facilitating more effective and accurate motor speed regulation in vector-controlled applications.
Flying Start
>The VFD has a function that allows restarting the motor while it is still rotating, without the need to wait for the motor to naturally come to stop. This process does not cause overvoltage tripping of the VFD. By continuously monitoring the changing output frequency and motor current, the VFD calculated the motor frequency quickly through effective measures, enabling motor rotation to be restarted while in motion.
> Examples of flying start application.
> The motor is not connected to power, it is rotated by mechanical load.
> Restarting the VFD after it has stopped.
> Restarting the VFD after a low-voltage ride-through. (Instantaneous drop or interruption of power supply voltage.)
Products Application in mining
With its high reliability, excellent speed regulation performance, and unique design for harsh environments, the RNHV series of medium-voltage Variable Frequency Drives (VFDs) is a core power transmission component for driving modern mines toward safer, more efficient, and intelligent operations. Below is a breakdown of its specific application value across various scenarios:
|
Application Scenario |
Core Equipment |
Traditional Pain Points & Challenges |
Value Provided by the RNHV Series |
Performance Examples / Data Reference |
|
Ventilation & Safety |
Main fans, auxiliary fans |
Complex management of multiple parallel fans, low reliability of electrical control systems, high energy consumption. |
Enables smooth, precise air volume regulation through high-voltage variable frequency control, ensuring system stability and reliability while reducing energy usage. |
At a domestic copper mine, replacing 9 smaller fans with 1 high-power unit driven by a VFD doubled return airflow capacity while significantly lowering actual power consumption. |
|
Production & Haulage |
Belt conveyors, scraper conveyors |
High mechanical stress from direct-on-line starting; frequent motor insulation failures; high maintenance costs. |
Sensorless vector control provides high starting torque and smooth acceleration, dramatically reducing mechanical and electrical grid impact. |
At a coal mine, motor failure rates dropped from ~30% to ~5% after retrofit, with substantial savings on cable replacement costs. |
|
Material Processing |
Ball mills, crushers |
Extremely high breakaway torque requirements; low efficiency and high maintenance of traditional drives. |
High starting torque and advanced control algorithms ensure smooth, reliable start-up under heavy loads, improving overall system efficiency and stability. |
Provides efficient variable frequency drive for advanced systems like permanent magnet direct drives, helping to eliminate high-maintenance mechanical components. |
|
Dewatering & Water Supply |
Multi-stage drainage pumps, high-pressure injection pumps |
Highly variable operating conditions; massive energy waste from valve throttling; critical demand for system reliability. |
Infinitely variable speed replaces inefficient valve control, achieving significant energy savings; integrated design and high ingress protection (IP) rating suit underground environments. |
In large-scale pump station retrofits, annual electricity savings for a single project can reach a scale of tens of millions of dollars. |
How to Select a Solution for Your Mine
To maximize the value of a high-voltage VFD in your operation, precise needs-matching is key:
Define Primary Objectives: Determine if the main goal is energy saving, reducing equipment failure rates, or improving automated control levels.
Analyze Specific Conditions: Detail the target equipment's power, voltage level (e.g., 6kV, 10kV, or 4160V VFD), existing control method, and operating environment.
Focus on Long-Term Value: Evaluate the initial investment against long-term returns from energy savings, reduced maintenance costs, and improved production efficiency.
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