How a Mains Filter Works
A mains filter is used in electrical installations to reduce disturbances on the power grid.
Electronic power control systems such as a
variable frequency drive
can generate high-frequency interference that flows back into the grid via the supply cable.
These disturbances are also referred to as electromagnetic interference (EMI).
A mains filter suppresses these disturbances before they reach the power grid.
This ensures compliance with EMC standards and prevents interference with other equipment.
How does a mains filter work?
A mains filter consists of a combination of inductors and capacitors that block or divert unwanted high-frequency signals.
The inductors limit rapid changes in current, while the capacitors divert high-frequency signals to ground.
In this way, disturbances generated by power electronics are effectively filtered before they can spread through the power grid.
Mains filters therefore play an important role in reliable drive technology and stable industrial automation.
More background information about variable frequency drives and drive systems can be found in the
Fluxcon VFD wiki.
Why is a mains filter necessary?
Variable frequency drives and other power electronic systems switch very rapidly to control the speed of electric motors.
This switching generates harmonics and high-frequency disturbances on the power grid.
If these disturbances are not filtered, they can cause problems such as:
- Malfunctions in measurement equipment
- Interference with communication and control systems
- Disturbances in other electrical devices
- Non-compliance with EMC standards
By applying a mains filter, these disturbances are significantly reduced, ensuring reliable system operation.
Applications of mains filters
Mains filters are widely used in installations where variable frequency drives and other power electronic systems are applied.
Typical applications include:
- Pumps and fans
- Conveyor systems
- Compressors
- Lifting equipment
- Industrial production lines
In these applications, mains filters help limit electromagnetic interference and ensure compliance with EMC standards.
Selection of a mains filter
When selecting a mains filter, factors such as drive power, rated current and supply voltage must be considered.
In addition, the required level of interference suppression depends on the EMC requirements of the installation.
For questions about the use of mains filters in combination with variable frequency drives, please also visit our
frequently asked questions about VFDs.
Fluxcon Frequency Converter Product Range
The Fluxcon product range consists of electronic components for controlling electric motors. Our portfolio includes product groups such as frequency converters (VFDs), soft starters, braking resistors, brake choppers, reactors and mains filters.
Fluxcon is chosen by customers for its practical approach. We offer an excellent price-performance ratio and fast delivery. Fluxcon engineering provides solutions based on practical expertise.
Simple solutions are often the best. Fluxcon aims to be transparent about chosen solutions and works closely with customers to achieve the best result for each process or application.
Our products are brand-independent. For example, a braking resistor can also be used with third-party frequency converters.
