Representative imageDetuned Reactors / Inductors
A detuned reactor is a three-phase inductor connected in series with each step of a power-factor-correction (PFC) capacitor bank to shift the bank's resonant frequency below the lowest significant harmonic (typically the 5th).
Overview
A detuned reactor is a three-phase inductor connected in series with each step of a power-factor-correction (PFC) capacitor bank to shift the bank's resonant frequency below the lowest significant harmonic (typically the 5th). This 'detunes' the LC circuit so the capacitors cannot resonate with system harmonics — preventing harmonic amplification, capacitor and transformer overloading, and voltage distortion in networks with high THD from non-linear loads. The detuning is set by the tuning factor (p): common values are 7% (tuned ~189 Hz at 50 Hz), 14%, and 5.67% for higher-order harmonic environments. ACE manufactures these as natural-cooled, compact, H-class dry-type reactors with high linearity (>=180% of rated current) and low losses, designed to carry rated plus harmonic current without significant inductance drop. Buyers choose ACE to protect capacitor banks and stabilise PFC panels in harmonic-rich plants.
Specifications
| Tuning / detuning factor (p) | 7% (~189 Hz @50Hz), 14%, 5.67% — and as specified |
|---|---|
| Rated current | capacitor-step current plus harmonic loading; linearity >=180% |
| Inductance tolerance | typically ±3% (IEC); <=5% inductance drop up to ~1.8x nominal capacitor current |
| Voltage class | LV (e.g. 415 / 440 / 525 / 690 V) and reactor rated voltage per step kVAr |
| Frequency | 50 Hz (60 Hz on request) |
| Phases | three-phase |
| Insulation | Class H; thermal protection (thermostat/PTC) option; low dB / low noise |
| Losses | low watt-loss per kg; natural air cooled, compact |
| Mounting | easy panel mounting; Enclosure: open IP00 / as specified |
| Applicable standards | IEC 60076-6 (reactors), IEC 61921, IEEE-519 |
Applications
- Power-factor-correction (PFC) panels and capacitor banks
- Anti-resonance / harmonic-resonance prevention for capacitor steps
- Line-pollution / harmonic mitigation systems
- Power-loss management in industrial plants with non-linear loads
- Protecting capacitors, transformers and feeders from harmonic overload
Frequently asked questions
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