The difference between input reactor and output reactor
1. Relevant parameters of the input reactor
Input reactor technical parameters:
1. Rated operating voltage: φ3/380V/50Hz or 660V/50Hz;
Rated operating current: 3A to 2000A -- 40℃;
2. Dielectric strength: No arcing breakdown in the core-winding system at 3000VAC/50Hz/10mA/60S;
3. Insulation resistance: For a 1000VDC iron core-winding system, the insulation resistance is ≥100MΩ;
4. The reactor noise level is less than 65 dB (tested at a horizontal distance of 1 meter from the reactor);
5. Protection rating: IP00
Insulation class: Class F and above
6. Product Standard: IEC289-1987 Reactors
Applicable conditions of input reactor
1. The power supply causes significant interference to other devices (interference, overvoltage);
2. Phase-to-phase voltage imbalance of the power supply > 1.8% of the rated voltage;
3. Extremely low impedance circuit (the power transformer has an impedance more than 10 times that of the frequency converter);
4. A large number of frequency converters installed on a single line to reduce line current;
5. Use a cosφ (power factor) correction capacitor or power factor correction unit;
The difference between input reactor and output reactor
Input reactor
1. The difference between input reactors and output reactors
The rectifier section of a general-purpose frequency converter uses an uncontrolled diode bridge rectifier circuit, and the intermediate filtering section uses a large capacitor as a filter. Therefore, the input current of the rectifier is actually the charging current of the capacitor, which is a relatively steep pulse wave with large harmonic components. This has a significant impact on the power grid and other surrounding equipment, and may sometimes interfere with other electronic equipment.
Installing an AC input reactor at the input terminal of the frequency converter can suppress the transmission of harmonics generated by the frequency converter to the power grid, reduce the interference of harmonics generated by the frequency converter to other electrical equipment, limit abnormal fluctuations in grid voltage and inrush current on the grid, and reduce their impact on the frequency converter.
The output voltage of a general-purpose frequency converter contains harmonics other than the fundamental frequency. Lower harmonics usually have a greater impact on the motor load, causing torque pulsation, while higher harmonics increase the leakage current of the frequency converter output cable, resulting in insufficient motor output. Therefore, both high and low order harmonics in the frequency converter output must be suppressed.
Adding an AC output reactor to the output side of the frequency converter can optimize the AC waveform of the frequency converter output, suppress harmonic current, prevent ground leakage current caused by the ground capacitance on the output side of the frequency converter, and extend the cable length from the frequency converter to the motor side.
