In daily production and life, series reactors and shunt reactors are two commonly used electrical equipment. From the names of series reactors and shunt reactors, we can simply understand that one is a single reactor connected in series in the system bus Among them, the other is the parallel connection of the reactor, and the power capacitor is connected in parallel to the system bus. Although it seems that only the circuit and connection method are different, but. The places of application and the roles they play are quite different. Just like the most common physical knowledge, the roles of series circuits and parallel circuits are different.
Reactors can be divided into AC reactors and DC reactors. The main function of AC reactors is anti-interference. Generally, it can be regarded as a three-phase coil wound on a three-phase iron core. AC reactors are generally directly connected to the main circuit, and the main consideration when selecting a model is the inductance (the voltage drop when the current flows through the reactor cannot be greater than 3% of the rated voltage). The DC reactor mainly plays the role of filtering in the circuit. Simply speaking, it is to wind the coil on the single-phase iron core to reduce the interference caused by radio noise. Whether it is an AC reactor or a DC reactor, its function is to reduce the interference to the AC signal and increase the resistance.
The series reactor is mainly placed at the position of the outgoing circuit breaker, and the series reactor has the ability to enhance short-circuit impedance and limit short-circuit current. It can suppress high-order harmonics and limit closing inrush current, thereby preventing harmonics from harming capacitors and achieving the functions of current limiting and filtering. Especially for the power environment where the harmonic content is not particularly large, connecting capacitors and reactors in the power system in series can improve power quality and is considered the most effective solution.
The shunt reactor mainly plays the role of reactive power compensation, which can compensate the capacitive charging current of the line, limit the system voltage rise and the generation of operating overvoltage, and ensure the reliable operation of the line. It is used to compensate the distributed capacitance compensation of long-distance transmission lines, prevent the voltage rise at the end of no-load long lines (usually used in 500KV systems), and also facilitate single-phase reclosing and reduce operating overvoltage. Widely used in long-distance power transmission and distribution projects of power grids.
Many customers often have such questions, that is, whether it is a series reactor or a shunt reactor, the price is very expensive, and the volume is relatively large. Whether it is installation or matching circuit construction, the cost is not low. Can these reactors not be used? We need to know that both the harm caused by harmonics and the loss caused by long-distance transmission are far greater than the purchase and use of reactors. Harmonic pollution to the power grid, resonance and voltage distortion will lead to abnormal operation or even failure of many other power equipment. Here, the editor recommends series reactors and shunt reactors produced by Hongyan Electric Company. Not only the quality is guaranteed, but also durable.
Post time: Apr-13-2023