Medium Voltage Drive - MVD

Large electric motor systems in continuous manufacturing plants account for a massive share of total facility energy consumption. Across heavy utilities and process plants, running fixed-speed medium-voltage motors with mechanical dampers, throttling valves, or fluid couplings leads to high parasitic power losses, severe mechanical stress during direct-on-line (DOL) starts, and elevated maintenance costs. The Lubi Electronics MVD Series addresses these critical B2B operational challenges by providing soft starting, precise process regulation, and dynamic torque control for large motor assets. By drastically curbing peak electrical demand, maintaining near-unity power factor, and eliminating voltage spikes on motor windings, the MVD Series delivers substantial lifecycle cost savings, protects critical capital equipment, and shortens payback periods.

Key Features & Benefits

• Ultra-High Operating Efficiency (>98.5%): Minimizes internal thermal and electrical losses across the drive train, resulting in substantial direct electricity cost savings and lower HVAC cooling requirements in electrical substations.
• Multi-Level Cascaded Cell Topology: Produces an exceptionally clean, near-sinusoidal voltage and current output with extremely low $dv/dt$, preventing insulation breakdown in motor windings and eliminating bearing currents without output sine-wave filters.
• Stringent Harmonic Compliance (IEEE 519): Multi-pulse diode rectification ensures low total harmonic distortion (THD) on the incoming utility grid, eliminating the need for external harmonic filters or power factor correction capacitors.
• Long Cable Run Capability: Designed to reliably drive motors located hundreds of meters away from the electrical control room without requiring line reactors or output transformers, saving civil and cabling infrastructure costs.
• Modular Architecture with Automatic Cell Bypass: In the event of a power cell fault, redundant cells automatically bypass within milliseconds, allowing the drive to continue running at slightly reduced or full capacity to avoid unscheduled plant shutdowns.
• Soft Starting with Zero Inrush Current: Eliminates heavy mechanical shock to gearboxes, couplings, and impellers while preventing severe voltage dips on the plant busbar during motor startup.
• Comprehensive Protection & Remote Diagnostics: Features integrated monitoring for overvoltage, overcurrent, motor thermal overload, phase imbalance, and earth faults, coupled with industrial fieldbus connectivity (Modbus, Profibus, Ethernet) for real-time SCADA integration and predictive maintenance.