Published by testguy, November 23, 2019. Website: testguy.net,
Power Interruptions
The most simple type of power quality problem occurs when power delivered to an electrical load goes away, this is called a “power interruption.” The different types of power interruptions are classified according to their duration.
- A momentary interruption is a complete loss of voltage on one or more phase conductors for a time period between 0.5 cycles and 3 seconds.
- A temporary interruption is a complete loss of voltage on one or more phase conductors for a time period between 3 seconds and 1 minute.
- A sustained interruption is a complete loss of voltage on one or more phase conductors for more than 1 minute.
Fig1. A power interruption occurs when power delivered to an electrical load goes away.
Power interruptions are caused by many different sources, such as lighting strikes utility switching operations, physical damage to power lines, and human error. A momentary power interruption could have serious or even dangerous results depending on the load connected, such as microprocessor-based or hospital equipment.
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