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When a supply voltage has been zero for a period of time in excess of 1 minute, the long duration voltage variation is considered as

When a supply voltage has been zero for a period of time in excess of 1 minute, the long duration voltage variation is considered as Correct Answer Sustained interruption

Sustained Interruptions:

  • When the supply voltage becomes zero for a period of time in excess of 1 min, the long-duration voltage variation is considered a sustained interruption.
  • It is a long duration voltage variation phenomenon.
  • Voltage interruptions longer than 1 min are often permanent and require human intervention to repair the system for restoration.

 

Sags(dips):

A sag is a decrease in rms voltage or current between 0.1 and 0.9 pu at the power frequency for durations from 0.5 cycle to 1 min.

Swells:

A swell is defined as an increase to between 1.1 and 1.8 pu in rms voltage or current at the power frequency for durations from 0.5 cycle to 1 min.

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