A series reactor is a specialized protection and harmonic mitigation component designed for use with power capacitors, primarily installed in series within capacitor bank circuits. It serves two core functions: first, to limit the surge current generated during capacitor closing to prevent damage to internal capacitor structures caused by high currents; second, to effectively suppress grid harmonic currents, thereby avoiding harmonic amplification and system resonance, and ensuring the safe operation of both capacitors and entire distribution lines. It is an indispensable component in reactive power compensation systems. The product is fully compatible with the entire range of power capacitors from 5 kvar to 50 kvar and can be precisely matched to specific reactor specifications based on capacitor capacity and grid harmonic levels.

product highlights:

Precise harmonic suppression: Offers two reactance ratings of 7% (for 5th and 7th harmonics) and 14% (for 3rd harmonic), precisely tailored to compensation requirements across various harmonic environments.

High reliability of core design: Utilizes high-quality cold-rolled silicon steel sheets and a dry casting process, providing exceptional mechanical strength, strong short-circuit impact resistance, and superior insulation performance.

Low losses and long service life: Linear error ≤2%, losses ≤3% of winding rated capacity, temperature rise ≤65 K, ensuring long-term stable operation.

Optimal capacitor matching: Specifically designed for 5–50 kvar capacitor banks, effectively suppressing closing inrush currents, preventing harmonic amplification, and ensuring safe capacitor operation.

The main body of the product is manufactured using high-quality silicon steel sheet cores through a dry casting process, featuring precise core laminating that ensures low magnetic loss and minimal noise. The coils are wound with heat-resistant enameled copper wire and externally sealed with an integrated epoxy resin coating, providing excellent insulation performance, high mechanical strength, as well as resistance to moisture, dust, corrosion, and vibration. It can operate stably under various challenging conditions—including in distribution rooms, outdoor transformer boxes, and industrial workshops—without requiring additional protective enclosures.
The product offers two standard reactance rate options of 7% and 14%, tailored to various harmonic environments: The 7% reactance reactor is primarily designed to suppress third-order and higher low-order harmonics, suitable for general industrial and mining enterprises, commercial buildings, and conventional power distribution systems; the 14% reactance reactor is intended for applications with high grid harmonic levels and significant higher-order harmonic interference, such as automated production lines with dense frequency converters, metallurgical rectifier facility sites, and areas with concentrated large-frequency-converter loads, effectively filtering out higher-order harmonics and eliminating resonance risks.

The product series is organized according to matching capacitor capacities: compact reactors designed for small-capacity capacitors (5 kvar, 10 kvar, 15 kvar) feature compact size and flexible installation, suitable for small compensation circuits or on-site compensation of individual equipment; mainstream models for medium-capacity capacitors (20 kvar, 30 kvar) serve as standard components in industrial compensation cabinets and have the widest application range; large reactors for high-capacity capacitors (50 kvar) feature thicker coil windings and enhanced current-carrying capacity, ideal for large-scale centralized compensation systems and main compensation circuits in heavy industry facilities.

application scenarios:
In industrial manufacturing and machining workshops, protect capacitor banks from harmonic interference caused by variable-frequency equipment; in industries with concentrated rectifier loads such as steel metallurgy and electrolytic chemical plants, mitigate grid harmonics and suppress resonance; in commercial complexes and large building distribution rooms, enhance the operational stability of compensation systems; in photovoltaic and energy storage power stations, assist capacitors in achieving reactive power compensation and harmonic mitigation; in grid upgrade projects for aging industrial sites, address issues of excessive harmonics and frequent capacitor failures.