Filter reactor and starting reactor are two common reactors in power systems, and many people often don't know the difference between these two devices. Let's follow Suttens STS to understand the difference between a filter reactor and a starting reactor.
1. Different applicable objects.
Filter reactors are suitable for reactive power compensation and harmonic control. It is generally used in series with the filter capacitor in the low-voltage filter cabinet, tuned to a certain resonant frequency, and absorbs the harmonic current of the corresponding frequency in the power grid. There are a large number of harmonic sources such as rectifiers, converters, and frequency converters in the low-voltage power grid, and the high-order harmonics generated by them will seriously endanger the safe operation of the main transformer and other electrical equipment in the system. After the filter reactor and the capacitor are connected in series, it can not only effectively absorb the harmonics of the power grid, but also improve the power factor of the system, which plays a great role in the safe operation of the system.
The starting reactor is suitable for electric motors and is a kind of current-limiting reactor. When working, it is connected in series with the stator winding of the motor, and the core function is to limit the current when the motor starts, so that it can run within a safe range, so as to achieve the purpose of soft start. After the motor starts, it will automatically power off.
Second, the roles are different.
1.The function of the filter reactor.
a. Filter and absorb harmonics from the power grid.
The filter reactor mainly passes through a number of high-frequency harmonic currents, when the current frequency is high to a certain extent, the inductance is very large, so that for high-frequency alternating current, the inductance is like an open circuit, which can play a role in blocking the high frequency in the circuit. The filter reactor can not only meet the tuning characteristics of the filter, but also have the high-frequency resistance that directly determines the heating characteristics of the product, so the DC current and low-frequency current can pass through, that is, the harmonics of the power grid can be filtered out and absorbed.
b. Improve the power factor and ensure the safe operation of the power grid system.
Filter reactors are generally divided into single-phase and three-phase reactors, both of which are iron-core dry-type reactors. The voltage that can be withstood between the two ends is the superimposed harmonic voltage, the harmonic component is large, and the inductance is large, so the filter reactor coil needs to be specially wound with F-class or H-class flat copper wire, which needs to be arranged tightly and evenly. The core should be made of cold-rolled silicon steel sheet with low loss. In the power grid line, the filter reactor and the capacitor are basically connected in series, and the clips and fasteners of the filter reactor are made of non-magnetic materials to ensure the high quality of the reactor, which is conducive to improving the power factor and ensuring the safe operation of the power grid system.
2.Activate the function of the reactor.
The starting current of the motor is limited to achieve soft start. The initial starting current of the high-power asynchronous motor is very large, up to 4 7 times the rated current. The series starting reactor in the stator circuit of the motor can effectively limit the starting current of the motor and achieve the purpose of soft start. The starting reactor is isolated by a high-voltage working winding and a low-voltage control winding, which greatly improves its working reliability. It has an obvious current limiting effect in the stator winding of the motor in series and does not consume energy.
The above is an introduction to the difference between a filter reactor and a starting reactor, I hope it will help you!
Suttens (Shanghai) Power Supply is a brand manufacturer that provides customized passive filtering solutions to customers.
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