09-03 2026
Application of FKN12‑12 Series Pneumatic Load Switches in the New Energy Industry
The FKN12‑12 series indoor high‑voltage AC pneumatic load switch‑fuse combination apparatus is a key switching and protection device for 12 kV three‑phase AC power distribution systems. It adopts compressed air as the arc‑extinguishing medium, featuring stable breaking performance, compact structure, high mechanical endurance, strong environmental adaptability, and reliable five‑prevent interlock functions. With the rapid development of renewable energy generation, microgrids, energy storage systems, and distributed power supply, FKN12‑12 has become widely applied in new energy scenarios such as wind farms, photovoltaic stations, energy storage power stations, distributed generation integration, and microgrid systems. This article systematically elaborates on its application characteristics, scenario value, and technical advantages in the new energy sector.
1. Application in Grid‑Connected Photovoltaic Power Stations
Large‑scale and industrial & commercial photovoltaic power stations are important components of the new energy system. FKN12‑12 is mainly used in the box‑type step‑up substations and 10 kV power distribution rooms of PV stations, undertaking the control, isolation, and overcurrent protection of PV step‑up transformers and outlet circuits.
In a centralized PV power station, multiple PV arrays are connected to inverters, and the low‑voltage side is boosted to 10 kV through distribution transformers. The FKN12‑12 load switch‑fuse combination unit is installed on the high‑voltage side of the transformer. Under normal operating conditions, it can safely connect and disconnect rated load current, transformer no‑load current, and cable charging current. In the event of a short‑circuit fault in the transformer or the low‑voltage side, the fuse can quickly break the fault current, realizing rapid fault isolation and avoiding the spread of faults to the medium‑voltage distribution network and the main grid.
The compact structure of FKN12‑12 is highly compatible with the integrated box‑type substation commonly used in PV stations. It effectively reduces the volume and floor area of the substation, lowers the overall construction cost, and adapts to the modular construction requirements of large PV parks. Its stable arc‑extinguishing performance and high mechanical life can meet the long‑term, continuous, and frequent operation needs of photovoltaic power generation systems.
2. Application in Wind Power Generation Systems
Wind farms are typically located in remote areas, plains, hills, or offshore platforms, with harsh operating environments, large load fluctuations, and high requirements for equipment reliability and maintenance convenience. FKN12‑12 provides stable switching and protection functions for wind turbine step‑up transformers and medium‑voltage power collection circuits.
Each wind turbine is usually equipped with a box‑type step‑up transformer to boost the voltage from 0.69 kV to 10 kV and then connect to the wind farm’s power collection line. FKN12‑12 is installed in the high‑voltage cabin of the box transformer, responsible for switching control and short‑circuit protection. Its pneumatic arc‑extinguishing mechanism has strong resistance to shock and vibration, which is suitable for the vibration environment during wind turbine operation. At the same time, the fully enclosed structure can resist dust, humidity, salt fog, and extreme temperature differences, ensuring reliable operation in outdoor or semi‑outdoor environments.
In wind farm medium‑voltage power collection networks, ring‑network power supply and segmented power supply are widely used. FKN12‑12 can be flexibly configured in ring‑main units and branch cabinets to realize circuit switching, maintenance isolation, and fault localization. It helps improve the power supply reliability of the wind farm and reduces power loss caused by equipment faults or line maintenance.
3. Application in Electrochemical Energy Storage Power Stations
With the large‑scale development of new energy storage, electrochemical energy storage power stations have become an indispensable part of the power system. Energy storage stations have the characteristics of two‑way power flow, frequent charging and discharging, fast power response, and high safety requirements, putting forward special demands for medium‑voltage switching equipment.
FKN12‑12 is mainly used in the 10 kV step‑up/step‑down system of energy storage power stations, connecting the energy storage converter (PCS) transformer and the distribution network. It can realize safe disconnection during equipment maintenance, rapid isolation in case of electrical faults, and control during grid connection and disconnection. The pneumatic operating mechanism has fast operating speed and good mechanical stability, which can adapt to the frequent switching actions required by the charge‑dispatch and grid‑support working conditions of energy storage systems.
Energy storage stations have high fire protection requirements. FKN12‑12 adopts a pneumatic structure without oil or flammable media, which reduces the risk of fire and explosion. It matches the high‑safety design concept of energy storage power stations and is suitable for container‑type energy storage, grid‑side energy storage, industrial and commercial energy storage, and microgrid energy storage scenarios.
4. Application in Distributed Generation and Microgrid Systems
Distributed generation including rooftop PV, small wind turbines, biomass power generation, and gas power generation is usually connected to the distribution network in a decentralized manner. Microgrids can operate both in grid‑connected mode and island mode, requiring flexible, reliable, and fast‑response switching and protection devices.
FKN12‑12 is used in the point‑of‑common coupling (PCC) devices and user‑side medium‑voltage distribution cabinets of distributed power sources. It can realize grid connection, disconnection, and mode switching of distributed power supplies, and provide overcurrent and short‑circuit protection for small generators and transformers. In microgrid systems, when the microgrid switches between grid‑connected and islanded operation, FKN12‑12 can quickly and reliably complete the switching action, ensuring uninterrupted power supply for important loads.
Its small size and easy installation make it especially suitable for industrial parks, commercial complexes, data centers, and public buildings with limited installation space. It supports the reliable access of multi‑type distributed power sources and helps improve the consumption rate of new energy.
5. Application in Charging Infrastructure and New Energy Supporting Projects
Large‑scale charging stations, battery swap stations, and integrated optical‑storage‑charging intelligent power supply stations are important supporting facilities for the new energy industry. These scenarios feature high power density, complex load characteristics, high automation, and high safety requirements.
FKN12‑12 is applied in the 10 kV medium‑voltage distribution system of large charging and swapping stations to control and protect the main transformers and power supply circuits. It can safely cut load current and isolate faults, ensuring the stable and safe power supply of high‑power charging equipment. In integrated optical‑storage‑charging projects, FKN12‑12 coordinates the energy flow among photovoltaic, energy storage, and charging loads, providing a reliable switching foundation for multi‑energy coordinated operation.
The equipment has good compatibility with automation systems. It can be equipped with an electric operating mechanism to realize remote control, remote signaling, and telemetering functions, supporting the intelligent operation and unattended operation of new energy supporting infrastructure.
6. Technical Advantages of FKN12‑12 in New Energy Applications
6.1 Stable and Reliable Breaking Performance
FKN12‑12 adopts pneumatic arc extinguishing, with stable and repeatable breaking capacity. It can reliably break rated load current, loop current, and capacitive current, adapting to the fluctuation and impact characteristics of new energy generation.
6.2 Compact Structure and High Space Utilization
It is highly adaptable to box‑type substations, container‑type energy storage systems, and integrated power distribution devices commonly used in new energy projects, effectively reducing the occupied area and construction investment.
6.3 Strong Environmental Adaptability
It can operate stably under harsh conditions such as low temperature, high temperature, high humidity, salt fog, dust, and vibration, meeting the application requirements of wind farms, photovoltaic bases, and remote areas.
6.4 High Mechanical Endurance and Long Service Life
It adapts to the frequent operation requirements of energy storage, microgrids, and distributed power supplies, with low failure rate and low maintenance cost, reducing the full‑life‑cycle cost of new energy projects.
6.5 High Safety and Environmental Protection
Oil‑free, non‑toxic, and non‑explosive, it matches the high safety requirements of energy storage, charging and swapping stations, and industrial and commercial parks.
7. Conclusion
Against the background of global energy transformation and the rapid development of renewable energy, the FKN12‑12 series pneumatic load switch provides safe, reliable, economical, and efficient switching and protection solutions for the new energy industry due to its excellent technical characteristics and operational stability. It is widely used in photovoltaic power generation, wind power generation, electrochemical energy storage, microgrids, distributed generation, and charging infrastructure.
With the continuous expansion of new energy installation and the continuous improvement of power system flexibility and intelligence, FKN12‑12 will further play its technical advantages in modular integration, intelligent operation, and safety protection. It will help improve the stability, reliability, and economic benefits of new energy systems and provide strong equipment support for the large‑scale and high‑quality development of the new energy industry.
