In metallurgical steel production, sintering main exhaust fans consume significant energy, and traditional starting methods suffer from high inrush current and severe energy waste. Nancal Electric retrofitted a steel plant's sintering main exhaust system with medium voltage VFDs, achieving soft start and variable frequency speed regulation in a "two-drive-two" configuration with manual mutual backup. Committed to energy savings and customer cost reduction, we are always taking action.
This medium voltage drive has been in stable operation on-site for over three years and has withstood multiple grid voltage sags of varying severity.The power cell fast automatic bypass design and the Low Voltage Ride Through (LVRT) capability of Nancal Electric's medium voltage drives address internal cell failures and external grid voltage sags, respectively, effectively preventing unplanned shutdowns caused by such issues.
A well-known domestic chemical enterprise planned to implement an energy-saving, emission-reduction, and capacity-expansion project for its polycarbonate production unit. This included converting the originally steam-driven MVR steam compressor to electric drive. The MVR steam compressor system was originally driven by a high-speed steam turbine (referred to as the steam turbine), directly connected to the drive shaft of the high-speed centrifugal compressor. The NC HVVF series medium voltage drives provided by Nancal Electric delivered excellent high-frequency drive performance and system safety control performance for the high-speed PMSM in this MVR steam compressor "steam-to-electric" retrofit project of a polycarbonate production unit, providing highly reliable and sustainable technical support for the project retrofit.
The Reactor Coolant Pump (RCP) Drive is a critical single-point-of-failure electrical equipment in the third-generation AP1000 nuclear power plant. In 2022, Shandong Nuclear Power Company Ltd., Shanghai Nuclear Engineering Research & Design Institute, and Shanghai Nancal Electric Co., Ltd. initiated a collaboration and successfully developed an RCP Drive for the third-generation AP1000 nuclear power plant in 2023. This significantly enhances the operational reliability of the RCP Drives and the flexibility of standby RCP Drive switching, further improving the operational reliability and economic efficiency of AP1000 nuclear power units.
The aromatic hydrocarbon plant is one of the largest single-train crystallization process facilities in China, with a required annual operation time exceeding 8,000 hours. Nancal Electric's high-capacity water-cooling medium voltage drive stood out due to its superior performance and high-reliability technological advantages. Over two years of operation, the system achieved zero unplanned downtime, meeting all process and reliability requirements for aromatic hydrocarbon production.
In a chemical gasification plant, the propylene compressor plays a crucial role with high demands for operational reliability and stability. Equipment failure can have severe impacts on the plant and downstream production. The plant originally used an imported medium-voltage drive, but its failure rate has been increasing. A significant failure, especially one that cannot be quickly repaired, could halt gasification operations, disrupt downstream production, and lead to substantial economic losses. After extensive research and technical discussions, the user selected Shanghai Nancal’s medium-voltage drive for hot standby, enabling the redundant automatic switching technology of NC HVVF to resolve issues caused by failures in the original imported drive and ensure uninterrupted production.