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4.1.6 Supply disturbances

Distortion of the system voltage waveform caused by certain types of equipment may result in annoyance to users of the distribution system or damage to connected apparatus. UK Power Networks may suspend the supply in such an event.

In order to limit these affects Your proposed load should comply with the following:

  • The Distribution Code.

  • Engineering Recommendation P28 that is the national industry standard which applies for voltage fluctuation on the distribution network. Voltage fluctuation is generally caused by customer's equipment such as motors and welders or by voltage depression arising from transformer magnetising inrush current.

  • Engineering Recommendation P29 that is the national industry standard which applies for voltage unbalance on the distribution network.

  • Engineering Recommendation G5/4 that is the national industry standard which applies for waveform distortion and harmonics on the distribution network. Waveform distortion and harmonics are generally caused by customer's equipment such as variable speed drives and thyristor controlled devices.

 

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