The function of a reactor

A reactor is used, firstly, to limit large currents that may occur due to short circuits, and secondly, to filter out harmonics in the circuit, thereby making the output voltage cleaner

Common types of reactors used in power systems are series reactors and parallel reactors. Series reactors are primarily used to limit short-circuit currents; they are also used in filters, either in series or in parallel with capacitors, to limit higher harmonics in the power grid. Reactors in 220kV, 110kV, 35kV, and 10kV power grids are used to absorb the capacitive reactive power of cable lines. The operating voltage can be adjusted by changing the number of parallel reactors. Ultra-high voltage shunt reactors have various functions for improving the operational conditions related to reactive power in power systems. These functions include: 1. Reducing the capacitive effect on lines under light no-load or light load conditions, thereby lowering power-frequency transient overvoltages; 2. Improving the voltage distribution along long transmission lines; 3. Ensuring that reactive power in the lines is balanced as much as possible at the local level when the load is light, which prevents unreasonable flow of reactive power and also reduces power losses in the lines; 4. Lowering the power-frequency steady-state voltage on high-voltage buses when large generators are connected to the system, thereby facilitating synchronous connection of the generators...

During operation, frequency converters are often subjected to the impact of surge voltages and surge currents, which can severely damage their performance and reduce their service life. Therefore, input and output reactors should be installed to suppress surge voltages and surge currents, thereby protecting the frequency converter, extending its service life, and preventing harmonic interference. Since frequency converters use variable-frequency speed control, they generate high-order harmonics and waveform distortion, which can also affect the proper operation of the equipment. To address this issue, input and output reactors are installed to filter out harmonic voltages and currents, thereby improving the quality of the power supply.

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If the transformer capacity is more than ten times that of the inverter, or if it is 600 KVA or higher, a incoming line reactor must be installed; the DC reactor is used to improve the power factor, while the outgoing line reactor serves to protect the motor and the inverter by reducing interference caused by excessively long output cables.