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Classification of network disturbances

Home > Technical Support > Power Supply Quality > Classification of network disturbances

The main parameters which may be altered by a disturbance include (as defined under standard EN 50.160):

  • Frequency
  • Amplitude: temporal, power surges, sub voltages, etc.
  • Form of the Wave: harmonic
  • Symmetry of the triphasic system

In the last few years, there has been great advances in the minimization of the effects of network disturbances on equipment supplied by them.


Especially in Europe, the required compliance with the European Community Electromagnetic Compatibility Directive, has meant a substantial improvement in the two aspects of disturbances:

  • On the one hand, the limitation of the conducive and radiated transmitters from the disturbing apparatus, although those due to Telecommunication Transmitters, Atmospheric Discharges and the Exploitation of Commercial Networks continue to exist.
  • On the other hand, the reduction in susceptibility of the equipment to the disturbances.

Despite the improvements, there will always be disturbances which cause failures and/or breakdown in equipment. What follows is a list of the most common effects.

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