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Um other low voltage reactor refers to a series-connected electromagnetic device used in low voltage AC circuits (typically below 1000V) to limit inrush current, suppress harmonics, or absorb transient overvoltages. Unlike a standard line reactor or filter reactor, the term “other” often indicates a non-standard design — for example, a dual-winding reactor, a saturable reactor, or a reactor with customized impedance (e.g., 3%, 5%, 7%). These reactors are placed between a power source and loads such as capacitor banks, VFDs, or soft starters. The main effect is to increase system impedance at certain frequencies, thereby reducing current distortion and protecting switching devices.
| Função | Descrição |
|---|---|
| Inrush Current Limiting | Reduces peak inrush when switching capacitor banks or transformers. Typical reduction from 100× In to 10–15× In. |
| Harmonic Blocking | Tuned to 5th, 7th, or 11th harmonic (e.g., 7% impedance). Prevents resonance with power factor correction capacitors. |
| Voltage Notch Suppression | Smooths commutation notches caused by six-pulse VFDs. Protects other sensitive loads on the same bus. |
| Short-Circuit Current Reduction | Adds impedance to limit fault current. Helps existing breakers stay within interrupting rating after system expansion. |
| Phase Balancing (Special) | Some other low voltage reactors include asymmetric core gaps to balance load currents in delta-connected systems. |
| Energy Storage | Provides temporary magnetic energy during switching transitions. Reduces dv/dt across semiconductor switches. |
This table helps engineers and procurement teams quickly match the right other low voltage reactor to their system requirements.
| Parâmetro | Typical Range / Value |
|---|---|
| Tensão nominal | 208V, 240V, 380V, 415V, 480V, 690V AC |
| Rated Current | 5A to 2000A (50/60 Hz) |
| Impedance | 3%, 5%, 7%, 10%, 14% (at rated frequency) |
| Inductance Tolerance | ±5% or ±10% |
| Insulation Class | Class F (155°C) or Class H (180°C) |
| Linearity | Up to 1.8× rated current without saturation |
| Losses | Copper loss + core loss < 3% of rated kVA |
| Cooling | Natural convection (AN) or forced air (AF) |
| Invólucro | IP00 (open) / IP20 (with cover) / IP54 (outdoor) |
| Normas | IEC 60076-6, IEEE C57.12.01, UL 5085-3 |
Where an other low voltage reactor solves capacitor & drive issues
A power factor correction capacitor alone can resonate with grid inductance. An other low voltage reactor placed in series with the capacitor changes the resonant frequency. Below are typical cases where our reactor — whether 5% detuned or custom-impedance — prevents capacitor fuse blowing, blocks 5th/7th harmonics from VFDs, and allows safe switching without contactor welding.
We stock 3%, 5%, 7%, 10%, and 14% reactance types. An other low voltage reactor with non‑standard impedance (e.g., 8.5%) is wound in 10 working days, not 8 weeks.
Core design avoids saturation even during motor starting or capacitor inrush. This means an other low voltage reactor from Zhiming maintains its impedance from 20% to 200% load without overheating.
Copper and core losses stay below 2.5% of rated kVA. A compact other low voltage reactor can run at full load 24/7 with only 40°C temperature rise (class F insulation).
IP20 rated with cable glands. No need to buy separate enclosure. Every other low voltage reactor comes with labeled terminals (U1/U2, V1/V2, W1/W2) for mistake‑proof field wiring.
Vacuum impregnated core and clamped laminations. Even a 500A other low voltage reactor operates quietly inside control rooms — no humming complaints from operators.
Send us your capacitor bank size and transformer kVA. We compute whether a standard or other low voltage reactor is needed. Zhiming provides a two‑page report showing the new resonant frequency and harmonic blocking performance before you order.
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It indicates a non‑standard design — for example, a reactor with dual windings, a saturable core, or an impedance value not common in catalogs (e.g., 8%). Zhiming’s other low voltage reactor line covers any special electrical or mechanical requirement.
Yes, a 5% impedance reactor serves both purposes. It reduces inrush to about 10–12× rated current and shifts the resonant frequency below the 5th harmonic. For heavy VFD loads, a 7% other low voltage reactor may be better. kVAR = Active Power (kW) × (tanφ₁ – tanφ₂). Or simply send us 30 days of load data – we will calculate it for free.
Saturation causes inductance drop, so fault current rises closer to the no‑reactor value. Zhiming designs other low voltage reactor cores to saturate only above 2.5× rated current, giving protective relays enough time to trip.
Not always. One other low voltage reactor can serve multiple capacitor steps if the reactor is placed on the main bus before the step contactors. But for best detuning, place one reactor per step — especially when steps have different kVAR ratings.
Short the reactor output and apply low voltage (e.g., 10V AC) on input. Measure input current and calculate Z = V/I. For an other low voltage reactor, compare the result with the nameplate impedance tolerance (±5% typical).
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