Product Introduction
Inverter Reactors are electrical devices specifically designed for inverter systems. They optimize the inverter's operating environment, enhancing system stability and efficiency. While not mandatory (they are not standard inverter components), they are commonly deployed in inverter applications depending on operational requirements, effectively resolving many complex technical challenges.
Product Picture
Product Functions
1. Protecting Equipment
Protecting the Inverter:
Input reactors limit the peak value and rate of rise of the rectifier bridge's startup inrush current, safeguarding rectifier diodes or IGBT rectifier units. When grid capacity is high, they increase line impedance, reducing the risk of short-circuit current damage to the inverter.
Protecting the Motor:
Output reactors minimize voltage overshoot at motor terminals, protecting insulation and extending motor lifespan. They also reduce cable heating, alleviate switching stress at the inverter output, and mitigate inverter failure risks.
2. Improving Power Factor
Input Side:
Input reactors enhance the power factor at the inverter input, minimizing reactive power losses in the grid and improving transmission efficiency.
DC Side:
DC reactors optimize the power factor of the inverter's DC link, further boosting overall system energy efficiency.
3. Suppressing Electromagnetic Interference (EMI)
The high-order harmonics and rapid switching generated by inverters are significant sources of EMI. Input/output reactors filter or attenuate high-frequency noise currents in specific frequency bands, reducing both conducted EMI (through power lines) and radiated EMI (through space), thereby improving the system's electromagnetic compatibility (EMC).
production equipment
Key Product Selection Points
(1) Inverter Rated Power
The higher the inverter's power rating, the greater the required current peak, necessitating a larger reactor capacity. Generally, the reactor's rated current should be equal to or exceed the inverter's rated current.
(2) Reactor Impedance
The selected reactor must comply with the inverter's operational constraints, meaning it must have sufficient impedance to suppress voltage and current spikes. Impedance voltage drop refers to the actual voltage reduction across the reactor coil at 50 Hz under rated current conditions. Typically, an impedance voltage drop of 2–4% is recommended.
(3) Power Supply Voltage and Frequency
The power supply voltage and frequency are critical factors in reactor selection. Some Inverter Reactors are designed for specific voltage and frequency ranges, so the chosen reactor must match the supply's voltage and frequency specifications.
Application Scenarios
(1) Construction
In variable-frequency drive (VFD) control systems for central air conditioners, elevators, and other equipment, Inverter Reactors used with VFDs help reduce equipment noise, extend service life, and enhance building comfort and energy efficiency.
(2) Power Transmission
In variable-frequency speed control systems within power grids, reactors improve power factor, reduce transmission losses, and increase overall power delivery efficiency.
(3) Transportation
In VFD systems for electric vehicles, rail transit, and other transportation applications, reactors suppress electromagnetic interference (EMI), protect onboard electronic equipment, and ensure safe operation.
About the factory
FAQ
Q: What is a DC reactor used for?
A: It suppresses current fluctuations and harmonics, protects equipment (such as photovoltaic inverters and motor drives), and improves system stability.
Q: How to choose a model?
A: Consider three key parameters:
Rated current: Choose a model at least 20% higher than the system's maximum current.
Voltage level: Match the system's DC voltage (e.g., for an 800V system, choose a reactor ≥1000V).
Inductance: Calculate based on harmonic suppression requirements (e.g., suppressing the fifth harmonic requires a specific value).
Q: What precautions should be taken during installation?
A: Proper ventilation: Do not block heat dissipation holes to avoid high temperatures.
Moisture and dust resistance: For indoor use, choose a model with an IP rating of IP54 or higher.
Wiring: Connect the positive and negative poles as indicated. Do not reverse or short-circuit.
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