Line Reactor vs. Filter

Different nature

In a filter circuit, capacitors, inductors, and resistors make up filters. To obtain a given frequency of the power signal or to get rid of a specific frequency after the power signal, the filter might be an efficient filtering of that frequency or a frequency different from it in the power line.

Inductors are another name for reactors. All electrical conductors that can carry current have inductance in the broad sense because when a conductor is energized, it produces a magnetic field within a specific range of the space it occupys.

Different classification

• Filters

1. Filters are classified as analog filters and digital filters according to the signals processed.
2. According to the frequency band through which the signal is divided into low-pass, high-pass, band-pass, band-stop, and all-pass filter five.
3. According to the components used, there are two types of filters: passive and active.
4. According to the placement of the filters, they are divided into onboard filters and panel filters.

• Reactors

1. Reactors are divided into hollow type, iron core type, dry type, and oil-immersed type according to the structure and cooling medium.
2. The connection method: is divided into parallel reactor and series reactor.
3. By function: divided into current limiting and compensation.
4. By application: subdivided into specific applications, such as current limiting reactor, filter reactor, flat wave reactor, power factor compensation reactor, series reactor, balance reactor, ground reactor, arc extinguishing coil, incoming reactor, outgoing reactor, saturation reactor, self-saturating reactor, variable reactor (adjustable reactor, controllable reactor), yoke reactor, series resonant reactor, shunt resonant Reactors, etc.

Different function

A filter for a frequency selection device can severely attenuate some frequencies while allowing the signal of others to pass. Filters can be used to remove interference noise or spectrum analysis from this frequency selection process. Many people think that the power line filter's function is to help the device comply with the electromagnetic compatibility standards for conducted emissions and conducted sensitivity requirements. However, this is not a complete description of the power line filter's function, which also includes suppressing the device to produce stronger radiation interference.

Strictly speaking, the function of a power line filter is to prevent electromagnetic interference generated by the equipment itself from entering the power line and to prevent interference from the power line from entering the equipment. A power line filter is a low-pass filter that allows DC or 50hz operating current to pass through, while not allowing higher frequency EMI signals to pass through. A power line filter is bi-directional, it can prevent interference on the power grid into the equipment, the equipment has a negative impact so that the equipment to meet the requirements of the conductive sensitivity and prevent electromagnetic interference within the equipment through the power line to the power grid so that the equipment to meet the requirements of the conductive emission.

Power line filters must be used with equipment that can produce significant interference and equipment that is susceptible to interference from outside sources. Equipment with pulse circuits (microprocessors), equipment that uses SCRs, equipment with variable speed control, and equipment with motors are all examples of equipment that can produce significant interference. sensitive circuits, such as small signal analog circuits and machinery utilising micro-exporters.

The common reactors taken in power systems are series reactors and shunt reactors. Series reactors are mainly used to limit short-circuit currents, but also in filters connected in series or parallel with capacitors to limit high harmonics in the grid. Reactors in 220kV, 110kV, 35kV, and 10kV grids are used to absorb the charging capacitive reactive power of cable lines. The operating voltage can be adjusted by adjusting the number of shunt reactors.