Various techniques have been employed to overcome this problem.
These include:

• Derating transformers and switchgear, or oversizing cables
• Using special phase shift or isolation transformers
• Inserting series reactors
• Using tuned passive filters

There are arguments for and against each of these solutions but, whichever system is chosen, it is either difficult to install or totally inflexible to the changing needs of a modern day system.

The more flexible approach is to use the Memfilter AHC.

The Memfilter AHC is an active harmonic conditioner which counteracts the harmonics by injecting equal and opposite signals into the supply to cancel the offending waveforms.

Using state of the art technologies the Memfilter AHC can compensate for harmonics ranging from 2nd to 25th and gives the user the choice of either global or pre-selected order compensation.

Units can be used on three phase networks to give automatic compensation for either three phase, or single phase, harmonic distortion.

Memfilter AHC has the following advantages over all other forms of harmonic control:

• It continues to guarantee efficient harmonic compensation even when changes are made to the installation
• It is easy to use and install
• It auto configures to harmonic loads whatever their magnitude
• It is not susceptible to harmonic overload
• It is compatible with electrical generators
• It can be connected to any point in the network
• Additional units can be added to meet future system requirements

Memfilter AHC is easy to install either on a wall or within a switchboard. It requires either a three or four wire supply to the unit and the insertion of the measurement sensors into the polluted power supply.

If the objective is to reduce distortion on the supply authorities network then the unit needs to be placed upstream of the polluting load with the injection point as near to the point of incoming supply as possible.

If the need is to reduce pollution within the installation the unit must be positioned upstream but next to the pollutant.

We can carry out an accurate harmonic pollution audit and then develop a flexible, high performance solution with guaranteed results.