A power capacitor is an electrical device that stores and releases electrical energy in an AC power system. Connected in parallel with inductive loads, it supplies reactive power locally and compensates the reactive power drawn by motors, transformers, welding machines and other inductive equipment. The result is a higher power factor, lower line current, reduced transmission losses and improved voltage quality.
Geyue Electric manufactures a full range of low-voltage power capacitors for industrial, commercial and renewable energy applications. Whether you need standard can capacitors for a centralized compensation cabinet or compact intelligent capacitors for a modular panel, the right model depends on system voltage, required kvar and harmonic conditions.
A power capacitor is a passive electrical component that stores energy in an electric field. In low-voltage power systems, it is mainly used for reactive power compensation and power factor correction. By providing reactive power close to the load, the capacitor reduces the amount of reactive power that must be supplied by the utility grid, which lowers current, reduces losses and improves voltage stability.
When connected in parallel with an inductive load, the capacitor and the load exchange reactive power. The capacitor supplies the reactive power needed by the load, so the grid only supplies the active power. This reduces the phase angle between voltage and current, raises the power factor, and releases capacity in transformers, cables and switchgear.
Metallized polypropylene film with self-healing dielectric. Single-phase, three-phase, split-phase and cylinder BSMJ / BSMJ-Y designs. Split-phase types feature a neutral point terminal for phase-by-phase switching on unbalanced loads.
Compact integrated unit combining capacitor, controller, switching device and protection in one module. Automatic switching and self-diagnosis save panel space and simplify wiring for retrofits and new cabinets.
For harmonic-rich systems, capacitors are combined with series reactors. Reactance rate 7% or 14% is selected by harmonic spectrum to avoid resonance and protect the capacitor.
| Parameter | Typical Value |
|---|---|
| Rated voltage | 0.23 kV – 1.2 kV (common: 0.4 / 0.45 / 0.48 / 0.525 / 0.69 kV) |
| Rated output | 5 – 50 kvar per unit |
| Rated frequency | 50 Hz / 60 Hz |
| Connection | Single-phase, three-phase, split-phase |
| Dielectric | Self-healing metallized polypropylene film |
| Protection | Over-pressure disconnector, internal fuse |
| Standards | GB/T 12747.1-2004, IEC 60831-1:2014 |
| Enclosure | Aluminium can / cylinder, cabinet version available |
| Losses | Low dielectric losses, high efficiency |
| Cooling | Natural cooling, forced cooling available for cabinets |
What is a power capacitor used for?
A power capacitor stores and releases electrical energy in an AC system. Its main job is reactive power compensation and power factor correction, which improves energy efficiency, reduces losses and stabilizes voltage in industrial and commercial power networks.
What is the difference between a self-healing shunt capacitor and an intelligent capacitor?
A self-healing shunt capacitor is a standalone capacitor connected in parallel with the load, switched by an external contactor and controller. An intelligent capacitor integrates the capacitor, controller, switching device and protection in one module, so it switches automatically and takes less panel space.
Which standards do Geyue power capacitors comply with?
Our power capacitors are manufactured and tested according to GB/T 12747.1-2004 and IEC 60831-1:2014.
Can I buy power capacitors directly from the factory?
Yes. Geyue Electric is a direct power capacitor manufacturer in China. We supply both standard models and customized specifications, and we accept orders of different volumes.
How do I select the reactance rate for a detuned capacitor bank?
The reactance rate depends on the harmonic spectrum. A 7% reactor is commonly used for systems with 5th and 7th harmonics, while 14% is used when 3rd harmonic is present. Our engineers can help you choose the correct rate based on your site conditions.
Do you provide technical support for installation and commissioning?
Yes. We provide installation guides, wiring diagrams and remote technical support. For complex projects, our engineers can assist with capacitor bank design and commissioning.
Geyue Electric is a professional power capacitor manufacturer based in Yueqing, Zhejiang, China. We design and produce self-healing shunt capacitors, intelligent capacitors and complete compensation systems, and we supply customers worldwide with reliable products and technical support.
Tell us your system voltage, required kvar, harmonic conditions and installation type.
Our engineers will recommend the right power capacitor for your project.
Contact Geyue Electric
