Momentary Interruptions - Utility

In order to maintain overall performance of the utility's system, large grid switching is periodically done. When this switching occurs it is possible to introduce momentary interruptions in the voltage. Typically, these are very, very brief outages.

Most of these disturbances are overshadowed by the utility's distribution system. By the time the interruption gets to most customers, it hardly exists anymore. But, for those customers close to substations, momentary interruptions do appear.

Depending on the duration of the interruption, the electronic devices in a customer's business will probably withstand, or ride-through, the change. If it is long enough, then the equipment will respond as it would with a sag. The power supplies may not be able to keep the DC voltage perfectly stable, and somewhere in the device a "1" or a "0" gets confused. Momentary interruptions are also a major contributor to computer lock-ups and restarts.

If these anomalies are causing data integrity problems, then there are two alternatives. First, install a power supply with a longer ride-through time..

Second, install an energy storage device such as an uninterruptible power supply (UPS). Properly specified and installed, a UPS will provide the needed ride-through time.