Is the reactive power compensation capacitor connected in series or in parallel?
Sep 23, 2025| Reactive power compensation capacitors are commonly used in power factor compensation work in various industries. Their actual application has achieved remarkable results. However, during the installation process, some users are not clear whether to install them in parallel or in series. So, let the capacitor manufacturer Cook Cooper provide users with a detailed explanation!
Capacitive reactive power compensation devices are typically connected to the power system in a parallel configuration. The following are the characteristics and reasons for parallel compensation:
1. The characteristics of parallel compensation
Direct connection: Capacitors are connected in parallel to the load or the system to provide reactive power and compensate for the reactive power required by inductive loads (such as motors, transformers).
Improving power factor: By compensating for reactive power, reducing reactive current in lines and transformers, lowering losses, and enhancing voltage stability.
2. Advantages of Parallel Compensation
Flexible adjustment: It can be grouped and switched on or off according to system requirements, achieving dynamic compensation.
Installation is simple: The parallel capacitor bank is usually installed near the substation or the load, making it easy to maintain.
Lower cost: Compared with series compensation, the equipment and installation cost of parallel compensation is lower.
3. Application of Series Compensation
Series compensation is mainly used for long-distance transmission lines. By connecting capacitors in series, the inductance of the line is counteracted, thereby enhancing the transmission capacity and stability. However, it is less frequently used for reactive power compensation.
4. Typical scenarios of parallel compensation
Industrial electricity usage: compensating for inductive loads such as motors and welding machines.
Commercial buildings: Compensate for the reactive power of lighting, air conditioning and other equipment.
Power distribution system: Installed in substations or distribution lines, it enhances the power factor of the system.